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<li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.08955">arXiv:2501.08955</a> <span> [<a href="https://arxiv.org/pdf/2501.08955">pdf</a>, <a href="https://arxiv.org/format/2501.08955">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.134.022501">10.1103/PhysRevLett.134.022501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Stepping into the Sea of Instability: The New Sub-us Superheavy Nucleus 252Rf </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Khuyagbaatar%2C+J">J. Khuyagbaatar</a>, <a href="/search/?searchtype=author&query=Mosat%2C+P">P. Mosat</a>, <a href="/search/?searchtype=author&query=Ballof%2C+J">J. Ballof</a>, <a href="/search/?searchtype=author&query=Cantemir%2C+R+A">R. A. Cantemir</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Hermainski%2C+K">K. Hermainski</a>, <a href="/search/?searchtype=author&query=He%C3%9Fberger%2C+F+P">F. P. He脽berger</a>, <a href="/search/?searchtype=author&query=J%C3%A4ger%2C+E">E. J盲ger</a>, <a href="/search/?searchtype=author&query=Kindler%2C+B">B. Kindler</a>, <a href="/search/?searchtype=author&query=Krier%2C+J">J. Krier</a>, <a href="/search/?searchtype=author&query=Kurz%2C+N">N. Kurz</a>, <a href="/search/?searchtype=author&query=L%C3%B6chner%2C+S">S. L枚chner</a>, <a href="/search/?searchtype=author&query=Lommel%2C+B">B. Lommel</a>, <a href="/search/?searchtype=author&query=Schausten%2C+B">B. Schausten</a>, <a href="/search/?searchtype=author&query=Wei%2C+Y">Y. Wei</a>, <a href="/search/?searchtype=author&query=Wieczorek%2C+P">P. Wieczorek</a>, <a href="/search/?searchtype=author&query=Yakushev%2C+A">A. Yakushev</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2501.08955v1-abstract-short" style="display: inline;"> We report the discovery of the new isotope $^{252}$Rf. With its extremely short half-life of $60^{+90}_{-30}$~ns, it expands the range of half-lives of the known superheavy nuclei by about two orders of magnitude. This nucleus was synthesized in its high-$K$ isomeric state, for which we measured a half-life of $13^{+4}_{-3}$~$渭$s. Our results confirm a smooth onset of decreasing ground-state spont… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.08955v1-abstract-full').style.display = 'inline'; document.getElementById('2501.08955v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.08955v1-abstract-full" style="display: none;"> We report the discovery of the new isotope $^{252}$Rf. With its extremely short half-life of $60^{+90}_{-30}$~ns, it expands the range of half-lives of the known superheavy nuclei by about two orders of magnitude. This nucleus was synthesized in its high-$K$ isomeric state, for which we measured a half-life of $13^{+4}_{-3}$~$渭$s. Our results confirm a smooth onset of decreasing ground-state spontaneous fission half-lives in the neutron-deficient Rf isotopes towards the isotopic border of $10^{-14}$~s, which is the time needed to form an atomic shell. Our findings set a new benchmark for further exploration of phenomena associated with high-$K$ states and inverted fission-stability in the heaviest nuclei. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.08955v1-abstract-full').style.display = 'none'; document.getElementById('2501.08955v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 134, 022501 (2025) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.01714">arXiv:2408.01714</a> <span> [<a href="https://arxiv.org/pdf/2408.01714">pdf</a>, <a href="https://arxiv.org/format/2408.01714">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.109.034311">10.1103/PhysRevC.109.034311 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> On the decay properties of the neutron-deficient isotope 242Es </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Khuyagbaatar%2C+J">J. Khuyagbaatar</a>, <a href="/search/?searchtype=author&query=Cantemir%2C+R+A">R. A. Cantemir</a>, <a href="/search/?searchtype=author&query=Duellmann%2C+C+E">Ch. E. Duellmann</a>, <a href="/search/?searchtype=author&query=Jaeger%2C+E">E. Jaeger</a>, <a href="/search/?searchtype=author&query=Kindler%2C+B">B. Kindler</a>, <a href="/search/?searchtype=author&query=Krier%2C+J">J. Krier</a>, <a href="/search/?searchtype=author&query=Kurz%2C+N">N. Kurz</a>, <a href="/search/?searchtype=author&query=Lommel%2C+B">B. Lommel</a>, <a href="/search/?searchtype=author&query=Schausten%2C+B">B. Schausten</a>, <a href="/search/?searchtype=author&query=Yakushev%2C+A">A. Yakushev</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.01714v1-abstract-short" style="display: inline;"> The radioactive decay properties of $^{242}$Es were studied with significantly improved statistics compared to available literature data. This isotope was produced in the 3n evaporation channel of the fusion reaction of $^{48}$Ca+$^{197}$Au. A half-life of 16.9(8)~s was deduced from 662 $伪$ decays of $^{242}$Es, resulting in an $伪$-decay branching of 41(3)\%. Twenty-six fission events with a half-… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.01714v1-abstract-full').style.display = 'inline'; document.getElementById('2408.01714v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.01714v1-abstract-full" style="display: none;"> The radioactive decay properties of $^{242}$Es were studied with significantly improved statistics compared to available literature data. This isotope was produced in the 3n evaporation channel of the fusion reaction of $^{48}$Ca+$^{197}$Au. A half-life of 16.9(8)~s was deduced from 662 $伪$ decays of $^{242}$Es, resulting in an $伪$-decay branching of 41(3)\%. Twenty-six fission events with a half-life of 18.2$^{+4.5}_{-3.0}$~s were assigned to originate from the electron-capture delayed fission of $^{242}$Es. The probability for the electron-capture delayed fission was measured to be 0.015(4), which improves and resolves ambiguities in available experimental data. We discuss all known cases for electron-capture delayed fission in Es, Bk, and Am isotopes and compare experimental data with predictions from a recent semi-empirical model. A cross section of 27(3)~nb was measured for the production of $^{242}$Es. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.01714v1-abstract-full').style.display = 'none'; document.getElementById('2408.01714v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 109 (2024) 034311 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.06464">arXiv:2402.06464</a> <span> [<a href="https://arxiv.org/pdf/2402.06464">pdf</a>, <a href="https://arxiv.org/ps/2402.06464">ps</a>, <a href="https://arxiv.org/format/2402.06464">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Penning-trap measurement of the $Q$-value of the electron capture in $^{163}\mathrm{Ho}$ for the determination of the electron neutrino mass </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Schweiger%2C+C">Christoph Schweiger</a>, <a href="/search/?searchtype=author&query=Bra%C3%9F%2C+M">Martin Bra脽</a>, <a href="/search/?searchtype=author&query=Debierre%2C+V">Vincent Debierre</a>, <a href="/search/?searchtype=author&query=Door%2C+M">Menno Door</a>, <a href="/search/?searchtype=author&query=Dorrer%2C+H">Holger Dorrer</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Enss%2C+C">Christian Enss</a>, <a href="/search/?searchtype=author&query=Filianin%2C+P">Pavel Filianin</a>, <a href="/search/?searchtype=author&query=Gastaldo%2C+L">Loredana Gastaldo</a>, <a href="/search/?searchtype=author&query=Harman%2C+Z">Zolt谩n Harman</a>, <a href="/search/?searchtype=author&query=Haverkort%2C+M+W">Maurits W. Haverkort</a>, <a href="/search/?searchtype=author&query=Herkenhoff%2C+J">Jost Herkenhoff</a>, <a href="/search/?searchtype=author&query=Indelicato%2C+P">Paul Indelicato</a>, <a href="/search/?searchtype=author&query=Keitel%2C+C+H">Christoph H. Keitel</a>, <a href="/search/?searchtype=author&query=Kromer%2C+K">Kathrin Kromer</a>, <a href="/search/?searchtype=author&query=Lange%2C+D">Daniel Lange</a>, <a href="/search/?searchtype=author&query=Novikov%2C+Y+N">Yuri N. Novikov</a>, <a href="/search/?searchtype=author&query=Renisch%2C+D">Dennis Renisch</a>, <a href="/search/?searchtype=author&query=Rischka%2C+A">Alexander Rischka</a>, <a href="/search/?searchtype=author&query=Sch%C3%BCssler%2C+R+X">Rima X. Sch眉ssler</a>, <a href="/search/?searchtype=author&query=Eliseev%2C+S">Sergey Eliseev</a>, <a href="/search/?searchtype=author&query=Blaum%2C+K">Klaus Blaum</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.06464v1-abstract-short" style="display: inline;"> The investigation of the absolute scale of the effective neutrino mass remains challenging due to the exclusively weak interaction of neutrinos with all known particles in the standard model of particle physics. Currently, the most precise and least model-dependent upper limit on the electron antineutrino mass is set by the KATRIN experiment from the analysis of the tritium \b{eta}-decay. Another… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.06464v1-abstract-full').style.display = 'inline'; document.getElementById('2402.06464v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.06464v1-abstract-full" style="display: none;"> The investigation of the absolute scale of the effective neutrino mass remains challenging due to the exclusively weak interaction of neutrinos with all known particles in the standard model of particle physics. Currently, the most precise and least model-dependent upper limit on the electron antineutrino mass is set by the KATRIN experiment from the analysis of the tritium \b{eta}-decay. Another promising approach is the electron capture in $^{163}\mathrm{Ho}$, which is under investigation using microcalorimetry within the ECHo and HOLMES collab orations. An independently measured Q-value of this process is vital for the assessment of systematic uncertainties in the neutrino mass determination. Here, we report a direct, independent determination of this $Q$-value by measuring the free-space cyclotron frequency ratio of highly charged ions of $^{163}\mathrm{Ho}$ and $^{163}\mathrm{Dy}$ in the Penning trap experiment \textsc{Pentatrap}. Combining this ratio with atomic physics calculations of the electronic binding energies yields a $Q$-value of $2863.2(0.6)\,\mathrm{eV}/c^{2}$ - a more than 50-fold improvement over the state-of-the-art. This will enable the determination of the electron neutrino mass on a sub-eV level from the analysis of the electron capture in $^{163}\mathrm{Ho}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.06464v1-abstract-full').style.display = 'none'; document.getElementById('2402.06464v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.05106">arXiv:2312.05106</a> <span> [<a href="https://arxiv.org/pdf/2312.05106">pdf</a>, <a href="https://arxiv.org/format/2312.05106">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.109.033116">10.1103/PhysRevA.109.033116 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Sympathetic cooling of trapped Th3+ alpha-recoil ions for laser spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Zitzer%2C+G">G. Zitzer</a>, <a href="/search/?searchtype=author&query=Tiedau%2C+J">J. Tiedau</a>, <a href="/search/?searchtype=author&query=Okhapkin%2C+M+V">M. V. Okhapkin</a>, <a href="/search/?searchtype=author&query=Zhang%2C+K">K. Zhang</a>, <a href="/search/?searchtype=author&query=Mokry%2C+C">C. Mokry</a>, <a href="/search/?searchtype=author&query=Runke%2C+J">J. Runke</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Peik%2C+E">E. Peik</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2312.05106v1-abstract-short" style="display: inline;"> Sympathetic cooling of Th$^{3+}$ ions is demonstrated in an experiment where $^{229}$Th and $^{230}$Th are extracted from uranium recoil ion sources and are confined in a linear Paul trap together with laser-cooled $^{88}$Sr$^+$ ions. Because of their similar charge-to-mass ratios the ions are closely coupled and arrange themselves in two-species Coulomb crystals, containing up to a few tens of Th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.05106v1-abstract-full').style.display = 'inline'; document.getElementById('2312.05106v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.05106v1-abstract-full" style="display: none;"> Sympathetic cooling of Th$^{3+}$ ions is demonstrated in an experiment where $^{229}$Th and $^{230}$Th are extracted from uranium recoil ion sources and are confined in a linear Paul trap together with laser-cooled $^{88}$Sr$^+$ ions. Because of their similar charge-to-mass ratios the ions are closely coupled and arrange themselves in two-species Coulomb crystals, containing up to a few tens of Th$^{3+}$ ions. To show the suitability of the sympathetically cooled Th$^{3+}$ ions for high-resolution laser spectroscopy, the absolute frequencies and isotope shifts of 5F$_{5/2}$\,$\rightarrow$\,6D$_{5/2}$ and 5F$_{7/2}$\,$\rightarrow$\,6D$_{5/2}$ transitions of $^{230}$Th$^{3+}$ have been measured. The system is developed for hyperfine spectroscopy of electronic transitions of nuclear ground and isomeric states in $^{229}$Th$^{3+}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.05106v1-abstract-full').style.display = 'none'; document.getElementById('2312.05106v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 109, 033116 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.12226">arXiv:2303.12226</a> <span> [<a href="https://arxiv.org/pdf/2303.12226">pdf</a>, <a href="https://arxiv.org/format/2303.12226">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.107.064604">10.1103/PhysRevC.107.064604 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Production of neptunium and plutonium nuclides from uranium carbide using 1.4-GeV protons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Au%2C+M">M. Au</a>, <a href="/search/?searchtype=author&query=Athanasakis-Kaklamanakis%2C+M">M. Athanasakis-Kaklamanakis</a>, <a href="/search/?searchtype=author&query=Nies%2C+L">L. Nies</a>, <a href="/search/?searchtype=author&query=Heinke%2C+R">R. Heinke</a>, <a href="/search/?searchtype=author&query=Chrysalidis%2C+K">K. Chrysalidis</a>, <a href="/search/?searchtype=author&query=K%C3%B6ster%2C+U">U. K枚ster</a>, <a href="/search/?searchtype=author&query=Kunz%2C+P">P. Kunz</a>, <a href="/search/?searchtype=author&query=Marsh%2C+B">B. Marsh</a>, <a href="/search/?searchtype=author&query=Mougeot%2C+M">M. Mougeot</a>, <a href="/search/?searchtype=author&query=Schweikhard%2C+L">L. Schweikhard</a>, <a href="/search/?searchtype=author&query=Stegemann%2C+S">S. Stegemann</a>, <a href="/search/?searchtype=author&query=Gracia%2C+Y+V">Y. Vila Gracia</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Rothe%2C+S">S. Rothe</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.12226v1-abstract-short" style="display: inline;"> Accelerator-based techniques are one of the leading ways to produce radioactive nuclei. In this work, the Isotope Separation On-Line method was employed at the CERN-ISOLDE facility to produce neptunium and plutonium from a uranium carbide target material using 1.4-GeV protons. Neptunium and plutonium were laser-ionized and extracted as 30-keV ion beams. A Multi-Reflection Time-of-Flight mass spect… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.12226v1-abstract-full').style.display = 'inline'; document.getElementById('2303.12226v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.12226v1-abstract-full" style="display: none;"> Accelerator-based techniques are one of the leading ways to produce radioactive nuclei. In this work, the Isotope Separation On-Line method was employed at the CERN-ISOLDE facility to produce neptunium and plutonium from a uranium carbide target material using 1.4-GeV protons. Neptunium and plutonium were laser-ionized and extracted as 30-keV ion beams. A Multi-Reflection Time-of-Flight mass spectrometer was used for ion identification by means of time-of-flight measurements as well as for isobaric separation. Isotope shifts were investigated for the 395.6-nm ground state transition in $^{236,237,239}$Np and the 413.4-nm ground state transition in $^{236,239,240}$Pu. Rates of $^{235-241}$Np and $^{234-241}$Pu ions were measured and compared with predictions of in-target production mechanisms simulated with GEANT4 and FLUKA to elucidate the processes by which these nuclei, which contain more protons than the target nucleus, are formed. $^{241}$Pu is the heaviest nuclide produced and identified at a proton-accelerator-driven facility to date. We report the availability of neptunium and plutonium as two additional elements at CERN-ISOLDE and discuss the limit of accelerator-based isotope production at high-energy proton accelerator facilities for nuclides in the actinide region. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.12226v1-abstract-full').style.display = 'none'; document.getElementById('2303.12226v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 12 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.12215">arXiv:2303.12215</a> <span> [<a href="https://arxiv.org/pdf/2303.12215">pdf</a>, <a href="https://arxiv.org/format/2303.12215">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nimb.2023.05.015">10.1016/j.nimb.2023.05.015 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> In-source and in-trap formation of molecular ions in the actinide mass range at CERN-ISOLDE </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Au%2C+M">M. Au</a>, <a href="/search/?searchtype=author&query=Athanasakis-Kaklamanakis%2C+M">M. Athanasakis-Kaklamanakis</a>, <a href="/search/?searchtype=author&query=Nies%2C+L">L. Nies</a>, <a href="/search/?searchtype=author&query=Ballof%2C+J">J. Ballof</a>, <a href="/search/?searchtype=author&query=Berger%2C+R">R. Berger</a>, <a href="/search/?searchtype=author&query=Chrysalidis%2C+K">K. Chrysalidis</a>, <a href="/search/?searchtype=author&query=Fischer%2C+P">P. Fischer</a>, <a href="/search/?searchtype=author&query=Heinke%2C+R">R. Heinke</a>, <a href="/search/?searchtype=author&query=Johnson%2C+J">J. Johnson</a>, <a href="/search/?searchtype=author&query=K%C3%B6ster%2C+U">U. K枚ster</a>, <a href="/search/?searchtype=author&query=Leimbach%2C+D">D. Leimbach</a>, <a href="/search/?searchtype=author&query=Marsh%2C+B">B. Marsh</a>, <a href="/search/?searchtype=author&query=Mougeot%2C+M">M. Mougeot</a>, <a href="/search/?searchtype=author&query=Reilly%2C+J">J. Reilly</a>, <a href="/search/?searchtype=author&query=Reis%2C+E">E. Reis</a>, <a href="/search/?searchtype=author&query=Schlaich%2C+M">M. Schlaich</a>, <a href="/search/?searchtype=author&query=Schweiger%2C+C">Ch. Schweiger</a>, <a href="/search/?searchtype=author&query=Schweikhard%2C+L">L. Schweikhard</a>, <a href="/search/?searchtype=author&query=Stegemann%2C+S">S. Stegemann</a>, <a href="/search/?searchtype=author&query=Wessolek%2C+J">J. Wessolek</a>, <a href="/search/?searchtype=author&query=Wienholtz%2C+F">F. Wienholtz</a>, <a href="/search/?searchtype=author&query=Wilkins%2C+S+G">S. G. Wilkins</a>, <a href="/search/?searchtype=author&query=Wojtaczka%2C+W">W. Wojtaczka</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Rothe%2C+S">S. Rothe</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.12215v1-abstract-short" style="display: inline;"> The use of radioactive molecules for fundamental physics research is a developing interdisciplinary field limited dominantly by their scarce availability. In this work, radioactive molecular ion beams containing actinide nuclei extracted from uranium carbide targets are produced via the Isotope Separation On-Line technique at the CERN-ISOLDE facility. Two methods of molecular beam production are s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.12215v1-abstract-full').style.display = 'inline'; document.getElementById('2303.12215v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.12215v1-abstract-full" style="display: none;"> The use of radioactive molecules for fundamental physics research is a developing interdisciplinary field limited dominantly by their scarce availability. In this work, radioactive molecular ion beams containing actinide nuclei extracted from uranium carbide targets are produced via the Isotope Separation On-Line technique at the CERN-ISOLDE facility. Two methods of molecular beam production are studied: extraction of molecular ion beams from the ion source, and formation of molecular ions from the mass-separated ion beam in a gas-filled radio-frequency quadrupole ion trap. Ion currents of U$^+$, UO$_{1-3}^+$, UC$_{1-3}^+$, UF$_{1-4}^+$, UF$_{1,2}$O$_{1,2}^+$ are reported. Metastable tantalum and uranium fluoride molecular ions are identified. Formation of UO$_{1-3}^+$, U(OH)$_{1-3}^+$, UC$_{1-3}^+$, UF$_{1,2}$O$_{1,2}^+$ from mass-separated beams of U$^+$, UF$_{1,2}^+$ with residual gas is observed in the ion trap. The effect of trapping time on molecular formation is presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.12215v1-abstract-full').style.display = 'none'; document.getElementById('2303.12215v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.02165">arXiv:2302.02165</a> <span> [<a href="https://arxiv.org/pdf/2302.02165">pdf</a>, <a href="https://arxiv.org/format/2302.02165">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6633/ad1e39">10.1088/1361-6633/ad1e39 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Opportunities for Fundamental Physics Research with Radioactive Molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Arrowsmith-Kron%2C+G">Gordon Arrowsmith-Kron</a>, <a href="/search/?searchtype=author&query=Athanasakis-Kaklamanakis%2C+M">Michail Athanasakis-Kaklamanakis</a>, <a href="/search/?searchtype=author&query=Au%2C+M">Mia Au</a>, <a href="/search/?searchtype=author&query=Ballof%2C+J">Jochen Ballof</a>, <a href="/search/?searchtype=author&query=Berger%2C+R">Robert Berger</a>, <a href="/search/?searchtype=author&query=Borschevsky%2C+A">Anastasia Borschevsky</a>, <a href="/search/?searchtype=author&query=Breier%2C+A+A">Alexander A. Breier</a>, <a href="/search/?searchtype=author&query=Buchinger%2C+F">Fritz Buchinger</a>, <a href="/search/?searchtype=author&query=Budker%2C+D">Dmitry Budker</a>, <a href="/search/?searchtype=author&query=Caldwell%2C+L">Luke Caldwell</a>, <a href="/search/?searchtype=author&query=Charles%2C+C">Christopher Charles</a>, <a href="/search/?searchtype=author&query=Dattani%2C+N">Nike Dattani</a>, <a href="/search/?searchtype=author&query=de+Groote%2C+R+P">Ruben P. de Groote</a>, <a href="/search/?searchtype=author&query=DeMille%2C+D">David DeMille</a>, <a href="/search/?searchtype=author&query=Dickel%2C+T">Timo Dickel</a>, <a href="/search/?searchtype=author&query=Dobaczewski%2C+J">Jacek Dobaczewski</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Eliav%2C+E">Ephraim Eliav</a>, <a href="/search/?searchtype=author&query=Engel%2C+J">Jon Engel</a>, <a href="/search/?searchtype=author&query=Fan%2C+M">Mingyu Fan</a>, <a href="/search/?searchtype=author&query=Flambaum%2C+V">Victor Flambaum</a>, <a href="/search/?searchtype=author&query=Flanagan%2C+K+T">Kieran T. Flanagan</a>, <a href="/search/?searchtype=author&query=Gaiser%2C+A">Alyssa Gaiser</a>, <a href="/search/?searchtype=author&query=Ruiz%2C+R+G">Ronald Garcia Ruiz</a>, <a href="/search/?searchtype=author&query=Gaul%2C+K">Konstantin Gaul</a> , et al. (37 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2302.02165v1-abstract-short" style="display: inline;"> Molecules containing short-lived, radioactive nuclei are uniquely positioned to enable a wide range of scientific discoveries in the areas of fundamental symmetries, astrophysics, nuclear structure, and chemistry. Recent advances in the ability to create, cool, and control complex molecules down to the quantum level, along with recent and upcoming advances in radioactive species production at seve… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.02165v1-abstract-full').style.display = 'inline'; document.getElementById('2302.02165v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.02165v1-abstract-full" style="display: none;"> Molecules containing short-lived, radioactive nuclei are uniquely positioned to enable a wide range of scientific discoveries in the areas of fundamental symmetries, astrophysics, nuclear structure, and chemistry. Recent advances in the ability to create, cool, and control complex molecules down to the quantum level, along with recent and upcoming advances in radioactive species production at several facilities around the world, create a compelling opportunity to coordinate and combine these efforts to bring precision measurement and control to molecules containing extreme nuclei. In this manuscript, we review the scientific case for studying radioactive molecules, discuss recent atomic, molecular, nuclear, astrophysical, and chemical advances which provide the foundation for their study, describe the facilities where these species are and will be produced, and provide an outlook for the future of this nascent field. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.02165v1-abstract-full').style.display = 'none'; document.getElementById('2302.02165v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Rep. Prog. Phys. 87 084301 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.14365">arXiv:2209.14365</a> <span> [<a href="https://arxiv.org/pdf/2209.14365">pdf</a>, <a href="https://arxiv.org/format/2209.14365">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/s10050-023-00930-y">10.1140/epja/s10050-023-00930-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Muonic atom spectroscopy with microgram target material </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/?searchtype=author&query=Antognini%2C+A">A. Antognini</a>, <a href="/search/?searchtype=author&query=Berger%2C+N">N. Berger</a>, <a href="/search/?searchtype=author&query=Cocolios%2C+T+E">T. E. Cocolios</a>, <a href="/search/?searchtype=author&query=Deokar%2C+N">N. Deokar</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Eggenberger%2C+A">A. Eggenberger</a>, <a href="/search/?searchtype=author&query=Eichler%2C+R">R. Eichler</a>, <a href="/search/?searchtype=author&query=Heines%2C+M">M. Heines</a>, <a href="/search/?searchtype=author&query=Hess%2C+H">H. Hess</a>, <a href="/search/?searchtype=author&query=Indelicato%2C+P">P. Indelicato</a>, <a href="/search/?searchtype=author&query=Kirch%2C+K">K. Kirch</a>, <a href="/search/?searchtype=author&query=Knecht%2C+A">A. Knecht</a>, <a href="/search/?searchtype=author&query=Krauth%2C+J+J">J. J. Krauth</a>, <a href="/search/?searchtype=author&query=Nuber%2C+J">J. Nuber</a>, <a href="/search/?searchtype=author&query=Ouf%2C+A">A. Ouf</a>, <a href="/search/?searchtype=author&query=Papa%2C+A">A. Papa</a>, <a href="/search/?searchtype=author&query=Pohl%2C+R">R. Pohl</a>, <a href="/search/?searchtype=author&query=Rapisarda%2C+E">E. Rapisarda</a>, <a href="/search/?searchtype=author&query=Reiter%2C+P">P. Reiter</a>, <a href="/search/?searchtype=author&query=Ritjoho%2C+N">N. Ritjoho</a>, <a href="/search/?searchtype=author&query=Roccia%2C+S">S. Roccia</a>, <a href="/search/?searchtype=author&query=Seidlitz%2C+M">M. Seidlitz</a>, <a href="/search/?searchtype=author&query=Severijns%2C+N">N. Severijns</a>, <a href="/search/?searchtype=author&query=von+Schoeler%2C+K">K. von Schoeler</a> , et al. (4 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.14365v2-abstract-short" style="display: inline;"> Muonic atom spectroscopy -- the measurement of the x rays emitted during the formation process of a muonic atom -- has a long standing history in probing the shape and size of nuclei. In fact, almost all stable elements have been subject to muonic atom spectroscopy measurements and the absolute charge radii extracted from these measurements typically offer the highest accuracy available. However,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.14365v2-abstract-full').style.display = 'inline'; document.getElementById('2209.14365v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.14365v2-abstract-full" style="display: none;"> Muonic atom spectroscopy -- the measurement of the x rays emitted during the formation process of a muonic atom -- has a long standing history in probing the shape and size of nuclei. In fact, almost all stable elements have been subject to muonic atom spectroscopy measurements and the absolute charge radii extracted from these measurements typically offer the highest accuracy available. However, so far only targets of at least a few hundred milligram could be used as it required to stop a muon beam directly in the target to form the muonic atom. We have developed a new method relying on repeated transfer reactions taking place inside a 100-bar hydrogen gas cell with an admixture of 0.25% deuterium that allows us to drastically reduce the amount of target material needed while still offering an adequate efficiency. Detailed simulations of the transfer reactions match the measured data, suggesting good understanding of the processes taking place inside the gas mixture. As a proof of principle we demonstrate the method with a measurement of the 2p-1s muonic x rays from a 5-渭g gold target. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.14365v2-abstract-full').style.display = 'none'; document.getElementById('2209.14365v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 14 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. A 59, 15(2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2204.06513">arXiv:2204.06513</a> <span> [<a href="https://arxiv.org/pdf/2204.06513">pdf</a>, <a href="https://arxiv.org/format/2204.06513">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.106.033108">10.1103/PhysRevA.106.033108 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Fluorescence calorimetry of an ion crystal </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Gajewski%2C+M">Marvin Gajewski</a>, <a href="/search/?searchtype=author&query=Li%2C+W">Wenbing Li</a>, <a href="/search/?searchtype=author&query=Wolf%2C+S">Sebastian Wolf</a>, <a href="/search/?searchtype=author&query=Hahn%2C+W">Walter Hahn</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Budker%2C+D">Dmitry Budker</a>, <a href="/search/?searchtype=author&query=Morigi%2C+G">Giovanna Morigi</a>, <a href="/search/?searchtype=author&query=Schmidt-Kaler%2C+F">Ferdinand Schmidt-Kaler</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2204.06513v4-abstract-short" style="display: inline;"> Motivated by the challenge of identifying intruder ions in a cold ion crystal, we investigate calorimetry from emitted fluorescence light. Under continuous Doppler cooling, the ion crystal reaches a temperature equilibrium with a fixed level of fluorescence intensity and any change in the motional energy of the crystal results in a modification of this intensity. We theoretically determine the flu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.06513v4-abstract-full').style.display = 'inline'; document.getElementById('2204.06513v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2204.06513v4-abstract-full" style="display: none;"> Motivated by the challenge of identifying intruder ions in a cold ion crystal, we investigate calorimetry from emitted fluorescence light. Under continuous Doppler cooling, the ion crystal reaches a temperature equilibrium with a fixed level of fluorescence intensity and any change in the motional energy of the crystal results in a modification of this intensity. We theoretically determine the fluorescence rate of an ion crystal as a function of the temperature, assuming that laser light is scattered along a two-level electronic transition, which couples to the crystal's vibrations via the mechanical effects of light. We analyze how the heat dissipated by collisions of an incoming intruder ion alters the scattering rate. We argue that an energy change by an incoming $^{229}$Th$^{10+}$ ion can be unambiguously detected within 100 $渭$s via illuminating a fraction of a 10$^{3}$ ion crystal. This method enables applications including capture and spectroscopy of charged states of thorium isotopes and investigation of highly charged ions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.06513v4-abstract-full').style.display = 'none'; document.getElementById('2204.06513v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 April, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 106, 033108 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.05971">arXiv:2203.05971</a> <span> [<a href="https://arxiv.org/pdf/2203.05971">pdf</a>, <a href="https://arxiv.org/format/2203.05971">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41586-020-2628-7">10.1038/s41586-020-2628-7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Penning-trap mass measurements of the deuteron and the HD+ molecular ion </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Rau%2C+S">Sascha Rau</a>, <a href="/search/?searchtype=author&query=Hei%C3%9Fe%2C+F">Fabian Hei脽e</a>, <a href="/search/?searchtype=author&query=K%C3%B6hler-Langes%2C+F">Florian K枚hler-Langes</a>, <a href="/search/?searchtype=author&query=Sasidharan%2C+S">Sangeetha Sasidharan</a>, <a href="/search/?searchtype=author&query=Haas%2C+R">Raphael Haas</a>, <a href="/search/?searchtype=author&query=Renisch%2C+D">Dennis Renisch</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Quint%2C+W">Wolfgang Quint</a>, <a href="/search/?searchtype=author&query=Sturm%2C+S">Sven Sturm</a>, <a href="/search/?searchtype=author&query=Blaum%2C+K">Klaus Blaum</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.05971v1-abstract-short" style="display: inline;"> The masses of the lightest atomic nuclei and the electron mass are interlinked and are crucial in a wide range of research fields, with their values affecting observables in atomic, molecular and neutrino physics as well as metrology. The most precise values for these fundamental parameters come from Penning-trap mass spectrometry, which achieves relative mass uncertainties in the range of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.05971v1-abstract-full').style.display = 'inline'; document.getElementById('2203.05971v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.05971v1-abstract-full" style="display: none;"> The masses of the lightest atomic nuclei and the electron mass are interlinked and are crucial in a wide range of research fields, with their values affecting observables in atomic, molecular and neutrino physics as well as metrology. The most precise values for these fundamental parameters come from Penning-trap mass spectrometry, which achieves relative mass uncertainties in the range of $10^{-11}$. However, redundancy checks using data from different experiments reveal significant inconsistencies in the masses of the proton ($m_p$), the deuteron ($m_d$) and helion ($m_\text{he}$), amounting to $5$ standard deviations for the term $螖=m_p+m_d-m_{\text{he}}$, which suggests that the uncertainty of these values may have been underestimated. Here we present results from absolute mass measurements of the deuteron and the ${HD}^+$ molecular ion against $^{12}C$ as a mass reference. Our value for the deuteron $m_d=2.013\,553\,212\,535 (17)$u supersedes the precision of the literature value by a factor of $2.4$ and deviates from this by $4.8$ standard deviations. With a relative uncertainty of $8$ parts per trillion (ppt) this is the most precise mass value measured directly in atomic mass units. Furthermore, the measurement of the ${HD}^+$ molecular ion, $m({HD}^+)=3.021\,378\,241\,561\,(61)$u, not only allows for a rigorous consistency check of our measurements of the masses of the deuteron (this work) and proton, but also establishes an additional link for the masses of tritium and helium-3 to the atomic mass unit. Combined with a recent measurement of the deuteron-to-proton mass ratio the uncertainty of the reference value of $m_p$ can be reduced by a factor of three. This is a post-peer-review, pre-copyedit version of an article published in Nature. The final authenticated version is available online at https://doi.org/10.1038/s41586-020-2628-7 <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.05971v1-abstract-full').style.display = 'none'; document.getElementById('2203.05971v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature vol. 585, pages 43-47 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.09945">arXiv:2111.09945</a> <span> [<a href="https://arxiv.org/pdf/2111.09945">pdf</a>, <a href="https://arxiv.org/format/2111.09945">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2022.166406">10.1016/j.nima.2022.166406 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Metallic magnetic calorimeter arrays for the first phase of the ECHo experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Mantegazzini%2C+F">F. Mantegazzini</a>, <a href="/search/?searchtype=author&query=Barth%2C+A">A. Barth</a>, <a href="/search/?searchtype=author&query=Dorrer%2C+H">H. Dorrer</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Enss%2C+C">C. Enss</a>, <a href="/search/?searchtype=author&query=Fleischmann%2C+A">A. Fleischmann</a>, <a href="/search/?searchtype=author&query=Hammann%2C+R">R. Hammann</a>, <a href="/search/?searchtype=author&query=Kempf%2C+S">S. Kempf</a>, <a href="/search/?searchtype=author&query=Kieck%2C+T">T. Kieck</a>, <a href="/search/?searchtype=author&query=Kovac%2C+N">N. Kovac</a>, <a href="/search/?searchtype=author&query=Velte%2C+C">C. Velte</a>, <a href="/search/?searchtype=author&query=Wegner%2C+M">M. Wegner</a>, <a href="/search/?searchtype=author&query=Wendt%2C+K">K. Wendt</a>, <a href="/search/?searchtype=author&query=Wickenh%C3%A4user%2C+T">T. Wickenh盲user</a>, <a href="/search/?searchtype=author&query=Gastaldo%2C+L">L. Gastaldo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2111.09945v1-abstract-short" style="display: inline;"> The ECHo experiment has been designed for the determination of the effective electron neutrino mass by means of the analysis of the end-point region of the Ho-163 electron capture spectrum. Metallic magnetic calorimeters enclosing Ho-163 are used for the high energy resolution calorimetric measurement of the Ho-163 spectrum. For the first phase of the experiment, ECHo-1k, a 72-pixel MMC array has… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.09945v1-abstract-full').style.display = 'inline'; document.getElementById('2111.09945v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.09945v1-abstract-full" style="display: none;"> The ECHo experiment has been designed for the determination of the effective electron neutrino mass by means of the analysis of the end-point region of the Ho-163 electron capture spectrum. Metallic magnetic calorimeters enclosing Ho-163 are used for the high energy resolution calorimetric measurement of the Ho-163 spectrum. For the first phase of the experiment, ECHo-1k, a 72-pixel MMC array has been developed. The single-pixel design has been optimised to reach 100% stopping power for the radiation emitted in the Ho-163 electron capture process (besides the electron neutrino) and an energy resolution < 10 eV FWHM. We describe the design of the ECHo-1k detector chip, the fabrication steps and the characterisation at room temperature, at 4 K and at the final operation temperatures. In particular, a detailed analysis of the results from these tests allowed to define a quality check protocol based on parameters measurable at room temperature. We discuss the performance achieved with the two ECHo-1k detector chips - the first one with Ho-163 implanted in gold and the second one with Ho-163 implanted in silver - which have been used for the high statistics measurement of the ECHo-1k experiment. An average activity per pixel of 0.81 Bq and 0.71 Bq and an average energy resolution of 6.07 eV FWHM and 5.55 eV FWHM have been achieved with these two detectors, fulfilling the requirements for the first phase of the ECHo experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.09945v1-abstract-full').style.display = 'none'; document.getElementById('2111.09945v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.00651">arXiv:2110.00651</a> <span> [<a href="https://arxiv.org/pdf/2110.00651">pdf</a>, <a href="https://arxiv.org/format/2110.00651">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/2244/1/012072">10.1088/1742-6596/2244/1/012072 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A cold electron-impact ion source driven by a photo-cathode -- New opportunities for the delivery of radioactive molecular beams? </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Ballof%2C+J">J. Ballof</a>, <a href="/search/?searchtype=author&query=Au%2C+M">M. Au</a>, <a href="/search/?searchtype=author&query=Barbero%2C+E">E. Barbero</a>, <a href="/search/?searchtype=author&query=Chrysalidis%2C+K">K. Chrysalidis</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Fedosseev%2C+V">V. Fedosseev</a>, <a href="/search/?searchtype=author&query=Granados%2C+E">E. Granados</a>, <a href="/search/?searchtype=author&query=Heinke%2C+R">R. Heinke</a>, <a href="/search/?searchtype=author&query=Marsh%2C+B">B. Marsh</a>, <a href="/search/?searchtype=author&query=Owen%2C+M">M. Owen</a>, <a href="/search/?searchtype=author&query=Rothe%2C+S">S. Rothe</a>, <a href="/search/?searchtype=author&query=Stora%2C+T">T. Stora</a>, <a href="/search/?searchtype=author&query=Yakushev%2C+A">A. Yakushev</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2110.00651v2-abstract-short" style="display: inline;"> The thick-target ISOL (Isotope mass Separation OnLine) method provides beams of more than 1000 radionuclides of 74 elements. The method is well established for elements with sufficiently high volatility at ca. 2000 掳C. To extract non-volatile elements the formation of a volatile molecule is required. While successful in some cases (e.g. carbon or boron), most of these elements are not yet availabl… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.00651v2-abstract-full').style.display = 'inline'; document.getElementById('2110.00651v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.00651v2-abstract-full" style="display: none;"> The thick-target ISOL (Isotope mass Separation OnLine) method provides beams of more than 1000 radionuclides of 74 elements. The method is well established for elements with sufficiently high volatility at ca. 2000 掳C. To extract non-volatile elements the formation of a volatile molecule is required. While successful in some cases (e.g. carbon or boron), most of these elements are not yet available as ISOL beam. A variety of volatile carrier molecules has been proposed for all elements produced in the target material, but their probability of survival during the extraction and ionization process is often limited by the high temperatures required for isotope diffusion in the thick targets and for ion source operation. While cold target concepts have already been proposed, the normal mode of operation of the typically used Versatile Arc Discharge Ion Source (VADIS) with a hot cathode is not well suited. Here, we report about first measurements with an electron-impact ion source operated at ambient temperature using electrons that were liberated via the photo-electric effect from a copper cathode. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.00651v2-abstract-full').style.display = 'none'; document.getElementById('2110.00651v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 April, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2109.00575">arXiv:2109.00575</a> <span> [<a href="https://arxiv.org/pdf/2109.00575">pdf</a>, <a href="https://arxiv.org/ps/2109.00575">ps</a>, <a href="https://arxiv.org/format/2109.00575">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/ac6233">10.1088/1367-2630/ac6233 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Robust Polarization Gradient Cooling of Trapped Ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Li%2C+W">Wenbing Li</a>, <a href="/search/?searchtype=author&query=Wolf%2C+S">Sebastian Wolf</a>, <a href="/search/?searchtype=author&query=Klein%2C+L">Lukas Klein</a>, <a href="/search/?searchtype=author&query=Budker%2C+D">Dmitry Budker</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Schmidt-Kaler%2C+F">Ferdinand Schmidt-Kaler</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2109.00575v2-abstract-short" style="display: inline;"> We implement three-dimensional polarization gradient cooling of trapped ions. Counter-propagating laser beams near $393\,$nm impinge in lin$\,\perp\,$lin configuration, at a frequency below the S$_{1/2}$ to P$_{3/2}$ resonance in $^{40}$Ca$^+$. We demonstrate mean phonon numbers of $5.4(4)$ at a trap frequency of $2蟺\times 285\,$kHz and $3.3(4)$ at $2蟺\times480\,$kHz, in the axial and radial direc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.00575v2-abstract-full').style.display = 'inline'; document.getElementById('2109.00575v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.00575v2-abstract-full" style="display: none;"> We implement three-dimensional polarization gradient cooling of trapped ions. Counter-propagating laser beams near $393\,$nm impinge in lin$\,\perp\,$lin configuration, at a frequency below the S$_{1/2}$ to P$_{3/2}$ resonance in $^{40}$Ca$^+$. We demonstrate mean phonon numbers of $5.4(4)$ at a trap frequency of $2蟺\times 285\,$kHz and $3.3(4)$ at $2蟺\times480\,$kHz, in the axial and radial directions, respectively. Our measurements demonstrate that cooling with laser beams detuned to lower frequencies from the resonance is robust against an elevated phonon occupation number, and thus works well for an initial ion motion far out of the Lamb-Dicke regime, for up to four ions, and for a micromotion modulation index $尾\leq 0.1$. Still, we find that the spectral impurity of the laser field influences both, cooling rates and cooling limits. Thus, a Fabry-P茅rot cavity filter is employed for efficiently suppressing amplified spontaneous emission of the diode laser. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.00575v2-abstract-full').style.display = 'none'; document.getElementById('2109.00575v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages and 9 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2108.01745">arXiv:2108.01745</a> <span> [<a href="https://arxiv.org/pdf/2108.01745">pdf</a>, <a href="https://arxiv.org/format/2108.01745">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/s10050-022-00739-1">10.1140/epja/s10050-022-00739-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A concept for the extraction of the most refractory elements at CERN-ISOLDE as carbonyl complex ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Ballof%2C+J">J. Ballof</a>, <a href="/search/?searchtype=author&query=Chrysalidis%2C+K">K. Chrysalidis</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Fedosseev%2C+V">V. Fedosseev</a>, <a href="/search/?searchtype=author&query=Granados%2C+E">E. Granados</a>, <a href="/search/?searchtype=author&query=Leimbach%2C+D">D. Leimbach</a>, <a href="/search/?searchtype=author&query=Marsh%2C+B+A">B. A. Marsh</a>, <a href="/search/?searchtype=author&query=Ramos%2C+J+P">J. P. Ramos</a>, <a href="/search/?searchtype=author&query=Ringvall-Moberg%2C+A">A. Ringvall-Moberg</a>, <a href="/search/?searchtype=author&query=Rothe%2C+S">S. Rothe</a>, <a href="/search/?searchtype=author&query=Stora%2C+T">T. Stora</a>, <a href="/search/?searchtype=author&query=Wilkins%2C+S+G">S. G. Wilkins</a>, <a href="/search/?searchtype=author&query=Yakushev%2C+A">A. Yakushev</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2108.01745v1-abstract-short" style="display: inline;"> We introduce a novel thick-target concept tailored to the extraction of refractory 4d and 5d transition metal radionuclides of molybdenum, technetium, ruthenium and tungsten for radioactive ion beam production. Despite the more than 60-year old history of thick-target ISOL mass-separation facilities like ISOLDE, the extraction of the most refractory elements as radioactive ion beam has so far not… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.01745v1-abstract-full').style.display = 'inline'; document.getElementById('2108.01745v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.01745v1-abstract-full" style="display: none;"> We introduce a novel thick-target concept tailored to the extraction of refractory 4d and 5d transition metal radionuclides of molybdenum, technetium, ruthenium and tungsten for radioactive ion beam production. Despite the more than 60-year old history of thick-target ISOL mass-separation facilities like ISOLDE, the extraction of the most refractory elements as radioactive ion beam has so far not been successful. In ordinary thick ISOL targets, their radioisotopes produced in the target are stopped within the condensed target material and have to diffuse through a solid material. Here, we present a concept which overcomes limitations associated with this method. We exploit the recoil momentum of nuclear reaction products for their release from the solid target material. They are thermalized in a carbon monoxide-containing atmosphere, in which volatile carbonyl complexes form readily at ambient temperature and pressure. This compound serves as volatile carrier for transport to the ion source. Excess carbon monoxide is removed by cryogenic gas separation to enable low pressures in the source region, in which the species are ionized and hence made available for radioactive ion beam formation. The setup is operated in batch mode, with the aim to extract isotopes having half-lives of at least several seconds. We report parameter studies of the key processes of the method, which validate this concept and which define the parameters for the setup. This would allow for the first time the extraction of radioactive molybdenum, tungsten and several other transition metals at thick-target ISOL facilities. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.01745v1-abstract-full').style.display = 'none'; document.getElementById('2108.01745v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2101.06076">arXiv:2101.06076</a> <span> [<a href="https://arxiv.org/pdf/2101.06076">pdf</a>, <a href="https://arxiv.org/ps/2101.06076">ps</a>, <a href="https://arxiv.org/format/2101.06076">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.126.182501">10.1103/PhysRevLett.126.182501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Some remarks on the discovery of Md-244 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Hessberger%2C+F+P">F. P. Hessberger</a>, <a href="/search/?searchtype=author&query=Block%2C+M">M. Block</a>, <a href="/search/?searchtype=author&query=Duellmann%2C+C+E">Ch. E. Duellmann</a>, <a href="/search/?searchtype=author&query=Yakushev%2C+A">A. Yakushev</a>, <a href="/search/?searchtype=author&query=Leino%2C+M">M. Leino</a>, <a href="/search/?searchtype=author&query=Uusitalo%2C+J">J. Uusitalo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2101.06076v1-abstract-short" style="display: inline;"> In two recent papers by Pore et al. and Khuyagbaatar et al. discovery of the new isotope Md-244 was reported. The decay data, however, are conflicting. While Pore et al. report two isomeric states decaying by alpha emission with E(1)=8.66(2) MeV, T_1/2=0.4+0.4/-0.1s and E(2)=8.31(2) MeV, T_1/2 approx 6 s, Khuyagbaatar et al. report only a single transition with a broad energy distribution of E=(8.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.06076v1-abstract-full').style.display = 'inline'; document.getElementById('2101.06076v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2101.06076v1-abstract-full" style="display: none;"> In two recent papers by Pore et al. and Khuyagbaatar et al. discovery of the new isotope Md-244 was reported. The decay data, however, are conflicting. While Pore et al. report two isomeric states decaying by alpha emission with E(1)=8.66(2) MeV, T_1/2=0.4+0.4/-0.1s and E(2)=8.31(2) MeV, T_1/2 approx 6 s, Khuyagbaatar et al. report only a single transition with a broad energy distribution of E=(8.73-8.86) MeV and T_1/2=0.30/-0.09 s. The data published by Pore et al. very similar to those published for Md-245 (E=8.64(2), 8.68(2) MeV T_1/2=0.35+0.23/-0.16}$ s ). Therefore, we compare the data presented for Md-244 by Pore et al. with those reported for Md-245 by Ninov et al. and also by Khuyagbaatar et al.. We conclude that the data presented by Pore et al. shall be attributed to Md-245 with small contributions (one event each) from Fm-245 and probably Md-246. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.06076v1-abstract-full').style.display = 'none'; document.getElementById('2101.06076v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 126, 182501 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.13340">arXiv:2005.13340</a> <span> [<a href="https://arxiv.org/pdf/2005.13340">pdf</a>, <a href="https://arxiv.org/format/2005.13340">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.125.142503">10.1103/PhysRevLett.125.142503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the $^{229}$Th isomer energy with a magnetic micro-calorimeter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Sikorsky%2C+T">Tomas Sikorsky</a>, <a href="/search/?searchtype=author&query=Geist%2C+J">Jeschua Geist</a>, <a href="/search/?searchtype=author&query=Hengstler%2C+D">Daniel Hengstler</a>, <a href="/search/?searchtype=author&query=Kempf%2C+S">Sebastian Kempf</a>, <a href="/search/?searchtype=author&query=Gastaldo%2C+L">Loredana Gastaldo</a>, <a href="/search/?searchtype=author&query=Enss%2C+C">Christian Enss</a>, <a href="/search/?searchtype=author&query=Mokry%2C+C">Christoph Mokry</a>, <a href="/search/?searchtype=author&query=Runke%2C+J">J枚rg Runke</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Wobrauschek%2C+P">Peter Wobrauschek</a>, <a href="/search/?searchtype=author&query=Beeks%2C+K">Kjeld Beeks</a>, <a href="/search/?searchtype=author&query=Rosecker%2C+V">Veronika Rosecker</a>, <a href="/search/?searchtype=author&query=Sterba%2C+J+H">Johannes H. Sterba</a>, <a href="/search/?searchtype=author&query=Kazakov%2C+G">Georgy Kazakov</a>, <a href="/search/?searchtype=author&query=Schumm%2C+T">Thorsten Schumm</a>, <a href="/search/?searchtype=author&query=Fleischmann%2C+A">Andreas Fleischmann</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2005.13340v1-abstract-short" style="display: inline;"> We present a measurement of the low-energy (0--60$\,$keV) $纬$ ray spectrum produced in the $伪$-decay of $^{233}$U using a dedicated cryogenic magnetic micro-calorimeter. The energy resolution of $\sim$$10\,$eV, together with exceptional gain linearity, allow us to measure the energy of the low-lying isomeric state in $^{229}$Th using four complementary evaluation schemes. The most accurate scheme… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.13340v1-abstract-full').style.display = 'inline'; document.getElementById('2005.13340v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.13340v1-abstract-full" style="display: none;"> We present a measurement of the low-energy (0--60$\,$keV) $纬$ ray spectrum produced in the $伪$-decay of $^{233}$U using a dedicated cryogenic magnetic micro-calorimeter. The energy resolution of $\sim$$10\,$eV, together with exceptional gain linearity, allow us to measure the energy of the low-lying isomeric state in $^{229}$Th using four complementary evaluation schemes. The most accurate scheme determines the $^{229}$Th isomer energy to be $8.10(17)\,$eV, corresponding to 153.1(37)$\,$nm, superseding in precision previous values based on $纬$ spectroscopy, and agreeing with a recent measurement based on internal conversion electrons. We also measure branching ratios of the relevant excited states to be $b_{29}=9.3(6)\%$ and $b_{42}=0.3(3)\%$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.13340v1-abstract-full').style.display = 'none'; document.getElementById('2005.13340v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 5 figures + supplementary</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 125, 142503 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2004.02571">arXiv:2004.02571</a> <span> [<a href="https://arxiv.org/pdf/2004.02571">pdf</a>, <a href="https://arxiv.org/format/2004.02571">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1515/ract-2020-0032">10.1515/ract-2020-0032 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Alpha spectrometric characterization of thin $^{233}$U sources for $^{229\text{(m)}}$Th production </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Haas%2C+R">Raphael Haas</a>, <a href="/search/?searchtype=author&query=Hufnagel%2C+M">Michelle Hufnagel</a>, <a href="/search/?searchtype=author&query=Abrosimov%2C+R">Roman Abrosimov</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Krupp%2C+D">Dominik Krupp</a>, <a href="/search/?searchtype=author&query=Mokry%2C+C">Christoph Mokry</a>, <a href="/search/?searchtype=author&query=Renisch%2C+D">Dennis Renisch</a>, <a href="/search/?searchtype=author&query=Runke%2C+J">J枚rg Runke</a>, <a href="/search/?searchtype=author&query=Scherer%2C+U+W">Ulrich W. Scherer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2004.02571v2-abstract-short" style="display: inline;"> Four different techniques were applied for the production of $^{233}$U alpha recoil ion sources, providing $^{229}$Th ions. They were compared with respect to a minimum energy spread of the $^{229}$Th recoil ions, using the emitted alpha particles as an indicator. The techniques of Molecular Plating, Drop-on-Demand inkjet printing, chelation from dilute nitric acid solution on chemically functiona… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.02571v2-abstract-full').style.display = 'inline'; document.getElementById('2004.02571v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2004.02571v2-abstract-full" style="display: none;"> Four different techniques were applied for the production of $^{233}$U alpha recoil ion sources, providing $^{229}$Th ions. They were compared with respect to a minimum energy spread of the $^{229}$Th recoil ions, using the emitted alpha particles as an indicator. The techniques of Molecular Plating, Drop-on-Demand inkjet printing, chelation from dilute nitric acid solution on chemically functionalized silicon surfaces, and self-adsorption on passivated titanium surfaces were used. All fabricated sources were characterized by using alpha spectrometry, radiographic imaging, and scanning electron microscopy. A direct validation for the estimated recoil ion rate was obtained by collecting $^{228}$Th recoil ions from $^{232}$U recoil ion sources prepared by self-adsorption and Molecular Plating. The chelation and the self-adsorption based approaches appear most promising for the preparation of recoil ion sources delivering monochromatic recoil ions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.02571v2-abstract-full').style.display = 'none'; document.getElementById('2004.02571v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 April, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">20 pages, 14 figures, 11 tables, ahead of print at Radiochim. Acta (2020)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Radiochimica Acta (2020) ahead of print </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1912.09354">arXiv:1912.09354</a> <span> [<a href="https://arxiv.org/pdf/1912.09354">pdf</a>, <a href="https://arxiv.org/ps/1912.09354">ps</a>, <a href="https://arxiv.org/format/1912.09354">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10909-020-02531-1">10.1007/s10909-020-02531-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Specific Heat of Holmium in Gold and Silver at Low Temperatures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Herbst%2C+M">Matthew Herbst</a>, <a href="/search/?searchtype=author&query=Reifenberger%2C+A">Andreas Reifenberger</a>, <a href="/search/?searchtype=author&query=Velte%2C+C">Clemens Velte</a>, <a href="/search/?searchtype=author&query=Dorrer%2C+H">Holger Dorrer</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Enss%2C+C">Christian Enss</a>, <a href="/search/?searchtype=author&query=Fleischmann%2C+A">Andreas Fleischmann</a>, <a href="/search/?searchtype=author&query=Gastaldo%2C+L">Loredana Gastaldo</a>, <a href="/search/?searchtype=author&query=Kempf%2C+S">Sebastian Kempf</a>, <a href="/search/?searchtype=author&query=Kieck%2C+T">Tom Kieck</a>, <a href="/search/?searchtype=author&query=K%C3%B6ster%2C+U">Ulli K枚ster</a>, <a href="/search/?searchtype=author&query=Mantegazzini%2C+F">Federica Mantegazzini</a>, <a href="/search/?searchtype=author&query=Wendt%2C+K">Klaus Wendt</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1912.09354v3-abstract-short" style="display: inline;"> The specific heat of dilute alloys of holmium in gold and in silver plays a major role in the optimization of low temperature microcalorimeters with enclosed $^{163}\textrm{Ho}$, such as the ones developed for the neutrino mass experiment ECHo. We investigate alloys with atomic concentrations of $x_\textrm{Ho}=0.01\,\% - 4\,\%$ at temperatures between $10\,\textrm{mK}$ and $800\,\textrm{mK}$. Due… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.09354v3-abstract-full').style.display = 'inline'; document.getElementById('1912.09354v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1912.09354v3-abstract-full" style="display: none;"> The specific heat of dilute alloys of holmium in gold and in silver plays a major role in the optimization of low temperature microcalorimeters with enclosed $^{163}\textrm{Ho}$, such as the ones developed for the neutrino mass experiment ECHo. We investigate alloys with atomic concentrations of $x_\textrm{Ho}=0.01\,\% - 4\,\%$ at temperatures between $10\,\textrm{mK}$ and $800\,\textrm{mK}$. Due to the large total angular momentum $J=8$ and nuclear spin $I=7/2$ of $\textrm{Ho}^{3+}$ ions, the specific heat of $\underline{\textrm{Au}}\textrm{:Ho}$ and $\underline{\textrm{Ag}}\textrm{:Ho}$ depends on the detailed interplay of various interactions, including contributions from the localized 4f electrons and nuclear contributions via hyperfine splitting. This makes it difficult to accurately determine the specific heat of these materials numerically. Instead, we measure their specific heat by using three experimental set-ups optimized for different concentration and temperature ranges. The results from measurements on six holmium alloys demonstrate that the specific heat of these materials is dominated by a large Schottky anomaly with its maximum at $T\approx 250\,\textrm{mK}$, which we attribute to hyperfine splitting and crystal field interactions. RKKY and dipole-dipole interactions between the holmium atoms cause additional, concentration-dependent effects. With regard to ECHo, we conclude that for typical operating temperatures of $T\leq 20\,\textrm{mK}$, silver holmium alloys with $x_\textrm{Ho}\gtrsim 1\,\%$ are suited best. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.09354v3-abstract-full').style.display = 'none'; document.getElementById('1912.09354v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 December, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 4 figures. Replacement with small modifications after peer-review, no change to scientific content</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J Low Temp Phys 202, 106-120 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1911.11674">arXiv:1911.11674</a> <span> [<a href="https://arxiv.org/pdf/1911.11674">pdf</a>, <a href="https://arxiv.org/format/1911.11674">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10751-019-1688-2">10.1007/s10751-019-1688-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Development of a recoil ion source providing slow Th ions including $^{229(m)}$Th in a broad charge state distribution </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Haas%2C+R">Raphael Haas</a>, <a href="/search/?searchtype=author&query=Kieck%2C+T">Tom Kieck</a>, <a href="/search/?searchtype=author&query=Budker%2C+D">Dmitry Budker</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Groot-Berning%2C+K">Karin Groot-Berning</a>, <a href="/search/?searchtype=author&query=Li%2C+W">Wenbing Li</a>, <a href="/search/?searchtype=author&query=Renisch%2C+D">Dennis Renisch</a>, <a href="/search/?searchtype=author&query=Schmidt-Kaler%2C+F">Ferdinand Schmidt-Kaler</a>, <a href="/search/?searchtype=author&query=Stopp%2C+F">Felix Stopp</a>, <a href="/search/?searchtype=author&query=Viatkina%2C+A">Anna Viatkina</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1911.11674v2-abstract-short" style="display: inline;"> Ions of the isomer $^{229m}$Th are a topic of high interest for the construction of a "nuclear clock" and in the field of fundamental physics for testing symmetries of nature. They can be efficiently captured in Paul traps which are ideal for performing high precision quantum logic spectroscopy. Trapping and identification of long-lived $^{232}$Th$^{+}$ ions from a laser ablation source was alread… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.11674v2-abstract-full').style.display = 'inline'; document.getElementById('1911.11674v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1911.11674v2-abstract-full" style="display: none;"> Ions of the isomer $^{229m}$Th are a topic of high interest for the construction of a "nuclear clock" and in the field of fundamental physics for testing symmetries of nature. They can be efficiently captured in Paul traps which are ideal for performing high precision quantum logic spectroscopy. Trapping and identification of long-lived $^{232}$Th$^{+}$ ions from a laser ablation source was already demonstrated by the TACTICa collaboration on Trapping And Cooling of Thorium Ions with Calcium. The $^{229m}$Th is most easily accessible as $伪$-decay daughter of the decay of $^{233}$U. We report on the development of a source for slow Th ions, including $^{229(m)}$Th for the TACTICa experiment. The $^{229(m)}$Th source is currently under construction and comprises a $^{233}$U monolayer, from which $^{229(m)}$Th ions recoil. These are decelerated in an electric field. Conservation of the full initial charge state distribution of the $^{229(m)}$Th recoil ions is one of the unique features of this source. We present ion-flight simulations for our adopted layout and give a final design. This source will provide Th ions in their original charge state at energies suitable for capture in a linear Paul trap for spectroscopy investigations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.11674v2-abstract-full').style.display = 'none'; document.getElementById('1911.11674v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures, PLATAN19 conference proceeding published in Hyperfine Interact 2020</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Hyperfine Interact 241, 25 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1911.05519">arXiv:1911.05519</a> <span> [<a href="https://arxiv.org/pdf/1911.05519">pdf</a>, <a href="https://arxiv.org/format/1911.05519">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.5128331">10.1063/1.5128331 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Production of highly charged ions of rare species by laser-induced desorption inside an electron beam ion trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Schweiger%2C+C">Christoph Schweiger</a>, <a href="/search/?searchtype=author&query=K%C3%B6nig%2C+C">Charlotte K枚nig</a>, <a href="/search/?searchtype=author&query=L%C3%B3pez-Urrutia%2C+J+R+C">Jos茅 R. Crespo L贸pez-Urrutia</a>, <a href="/search/?searchtype=author&query=Door%2C+M">Menno Door</a>, <a href="/search/?searchtype=author&query=Dorrer%2C+H">Holger Dorrer</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Eliseev%2C+S">Sergey Eliseev</a>, <a href="/search/?searchtype=author&query=Filianin%2C+P">Pavel Filianin</a>, <a href="/search/?searchtype=author&query=Huang%2C+W">Wenjia Huang</a>, <a href="/search/?searchtype=author&query=Kromer%2C+K">Kathrin Kromer</a>, <a href="/search/?searchtype=author&query=Micke%2C+P">Peter Micke</a>, <a href="/search/?searchtype=author&query=M%C3%BCller%2C+M">Marius M眉ller</a>, <a href="/search/?searchtype=author&query=Renisch%2C+D">Dennis Renisch</a>, <a href="/search/?searchtype=author&query=Rischka%2C+A">Alexander Rischka</a>, <a href="/search/?searchtype=author&query=Sch%C3%BCssler%2C+R+X">Rima X. Sch眉ssler</a>, <a href="/search/?searchtype=author&query=Blaum%2C+K">Klaus Blaum</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1911.05519v1-abstract-short" style="display: inline;"> This paper reports on the development and testing of a novel, highly efficient technique for the injection of very rare species into electron beam ion traps (EBITs) for the production of highly charged ions (HCI). It relies on in-trap laser-induced desorption of atoms from a sample brought very close to the electron beam resulting in a very high capture efficiency in the EBIT. We have demonstrated… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.05519v1-abstract-full').style.display = 'inline'; document.getElementById('1911.05519v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1911.05519v1-abstract-full" style="display: none;"> This paper reports on the development and testing of a novel, highly efficient technique for the injection of very rare species into electron beam ion traps (EBITs) for the production of highly charged ions (HCI). It relies on in-trap laser-induced desorption of atoms from a sample brought very close to the electron beam resulting in a very high capture efficiency in the EBIT. We have demonstrated a steady production of HCI of the stable isotope $^{165}\mathrm{Ho}$ from samples of only $10^{12}$ atoms ($\sim$ 300 pg) in charge states up to 45+. HCI of these species can be subsequently extracted for use in other experiments or stored in the trapping volume of the EBIT for spectroscopic measurements. The high efficiency of this technique expands the range of rare isotope HCIs available for high-precision nuclear mass and spectroscopic measurements. A first application of this technique is the production of HCI of the synthetic radioisotope $^{163}\mathrm{Ho}$ for a high-precision measurement of the $Q_{\mathrm{EC}}$-value of the electron capture in $^{163}\mathrm{Ho}$ within the Electron Capture in Holmium experiment (ECHo collaboration) ultimately leading to a measurement of the electron neutrino mass with an uncertainty on the sub-eV level. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.05519v1-abstract-full').style.display = 'none'; document.getElementById('1911.05519v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.06308">arXiv:1905.06308</a> <span> [<a href="https://arxiv.org/pdf/1905.06308">pdf</a>, <a href="https://arxiv.org/format/1905.06308">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41586-019-1533-4">10.1038/s41586-019-1533-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Energy of the $^{229}$Th nuclear clock transition </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Seiferle%2C+B">Benedict Seiferle</a>, <a href="/search/?searchtype=author&query=von+der+Wense%2C+L">Lars von der Wense</a>, <a href="/search/?searchtype=author&query=Bilous%2C+P+V">Pavlo V. Bilous</a>, <a href="/search/?searchtype=author&query=Amersdorffer%2C+I">Ines Amersdorffer</a>, <a href="/search/?searchtype=author&query=Lemell%2C+C">Christoph Lemell</a>, <a href="/search/?searchtype=author&query=Libisch%2C+F">Florian Libisch</a>, <a href="/search/?searchtype=author&query=Stellmer%2C+S">Simon Stellmer</a>, <a href="/search/?searchtype=author&query=Schumm%2C+T">Thorsten Schumm</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=P%C3%A1lffy%2C+A">Adriana P谩lffy</a>, <a href="/search/?searchtype=author&query=Thirolf%2C+P+G">Peter G. Thirolf</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.06308v1-abstract-short" style="display: inline;"> The first nuclear excited state of $^{229}$Th offers the unique opportunity for laser-based optical control of a nucleus. Its exceptional properties allow for the development of a nuclear optical clock which offers a complementary technology and is expected to outperform current electronic-shell based atomic clocks. The development of a nuclear clock was so far impeded by an imprecise knowledge of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.06308v1-abstract-full').style.display = 'inline'; document.getElementById('1905.06308v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.06308v1-abstract-full" style="display: none;"> The first nuclear excited state of $^{229}$Th offers the unique opportunity for laser-based optical control of a nucleus. Its exceptional properties allow for the development of a nuclear optical clock which offers a complementary technology and is expected to outperform current electronic-shell based atomic clocks. The development of a nuclear clock was so far impeded by an imprecise knowledge of the energy of the $^{229}$Th nuclear excited state. In this letter we report a direct excitation energy measurement of this elusive state and constrain this to 8.28$\pm$0.17 eV. The energy is determined by spectroscopy of the internal conversion electrons emitted in-flight during the decay of the excited nucleus in neutral $^{229}$Th atoms. The nuclear excitation energy is measured via the valence electronic shell, thereby merging the fields of nuclear- and atomic physics to advance precision metrology. The transition energy between ground and excited state corresponds to a wavelength of 149.7$\pm$3.1 nm. These findings set the starting point for high-resolution nuclear laser spectroscopy and thus the development of a nuclear optical clock of unprecedented accuracy. A nuclear clock is expected to have a large variety of applications, ranging from relativistic geodesy over dark matter research to the observation of potential temporal variation of fundamental constants. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.06308v1-abstract-full').style.display = 'none'; document.getElementById('1905.06308v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1904.10262">arXiv:1904.10262</a> <span> [<a href="https://arxiv.org/pdf/1904.10262">pdf</a>, <a href="https://arxiv.org/format/1904.10262">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10751-019-1579-6">10.1007/s10751-019-1579-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Catching, trapping and in-situ-identification of thorium ions inside Coulomb crystals of $^{40}$Ca$^+$ ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Stopp%2C+F">Felix Stopp</a>, <a href="/search/?searchtype=author&query=Groot-Berning%2C+K">Karin Groot-Berning</a>, <a href="/search/?searchtype=author&query=Jacob%2C+G">Georg Jacob</a>, <a href="/search/?searchtype=author&query=Budker%2C+D">Dmitry Budker</a>, <a href="/search/?searchtype=author&query=Haas%2C+R">Raphael Haas</a>, <a href="/search/?searchtype=author&query=Renisch%2C+D">Dennis Renisch</a>, <a href="/search/?searchtype=author&query=Runke%2C+J">J枚rg Runke</a>, <a href="/search/?searchtype=author&query=Th%C3%B6rle-Pospiech%2C+P">Petra Th枚rle-Pospiech</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Schmidt-Kaler%2C+F">Ferdinand Schmidt-Kaler</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1904.10262v1-abstract-short" style="display: inline;"> Thorium ions exhibit unique nuclear properties with high relevance for testing symmetries of nature, and Paul traps feature an ideal experimental platform for performing high precision quantum logic spectroscopy. Loading of stable or long-lived isotopes is well-established and relies on ionization from an atomic beam. A different approach allows trapping short-lived isotopes available as alpha-dec… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.10262v1-abstract-full').style.display = 'inline'; document.getElementById('1904.10262v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1904.10262v1-abstract-full" style="display: none;"> Thorium ions exhibit unique nuclear properties with high relevance for testing symmetries of nature, and Paul traps feature an ideal experimental platform for performing high precision quantum logic spectroscopy. Loading of stable or long-lived isotopes is well-established and relies on ionization from an atomic beam. A different approach allows trapping short-lived isotopes available as alpha-decay daughters, which recoil from a thin sample of the precursor nuclide. A prominent example is the short-lived $^{229\text{m}}$Th, populated in a decay of long-lived $^{233}$U. Here, ions are provided by an external source and are decelerated to be available for trapping. Such setups offer the option to trap various isotopes and charge states of thorium. Investigating this complex procedure, we demonstrate the observation of single $^{232}$Th$^+$ ions trapped, embedded into and sympathetically cooled via Coulomb interactions by co-trapped $^{40}$Ca$^+$ ions. Furthermore, we discuss different options for a non-destructive identification of the sympathetically cooled thorium ions in the trap, and describe in detail our chosen experimental method, identifying mass and charge of thorium ions from the positions of calcium ions, as their fluorescence is imaged on a CCD camera. These findings are verified by means of a time-of-flight signal when extracting ions of different mass-to-charge ratio from the Paul trap and steering them into a detector. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.10262v1-abstract-full').style.display = 'none'; document.getElementById('1904.10262v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Hyperfine Interact (2019) 240: 33 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1904.05559">arXiv:1904.05559</a> <span> [<a href="https://arxiv.org/pdf/1904.05559">pdf</a>, <a href="https://arxiv.org/format/1904.05559">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2019.162602">10.1016/j.nima.2019.162602 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Highly efficient isotope separation and ion implantation of $^{163}$Ho for the ECHo project </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Kieck%2C+T">Tom Kieck</a>, <a href="/search/?searchtype=author&query=Dorrer%2C+H">Holger Dorrer</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Gadelshin%2C+V">Vadim Gadelshin</a>, <a href="/search/?searchtype=author&query=Schneider%2C+F">Fabian Schneider</a>, <a href="/search/?searchtype=author&query=Wendt%2C+K">Klaus Wendt</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1904.05559v1-abstract-short" style="display: inline;"> The effective electron neutrino mass measurement at the ECHo experiment requires high purity $^{163}$Ho, which is ion implanted into detector absorbers. To meet the project specifications in efficiency and purity, the entire process chain of ionization, isotope separation, and implantation of $^{163}$Ho was optimized. A new two-step resonant laser ionization scheme was established at the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.05559v1-abstract-full').style.display = 'inline'; document.getElementById('1904.05559v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1904.05559v1-abstract-full" style="display: none;"> The effective electron neutrino mass measurement at the ECHo experiment requires high purity $^{163}$Ho, which is ion implanted into detector absorbers. To meet the project specifications in efficiency and purity, the entire process chain of ionization, isotope separation, and implantation of $^{163}$Ho was optimized. A new two-step resonant laser ionization scheme was established at the $30\, kV$ magnetic mass separator RISIKO. This achieved ionization and separation efficiencies with an average of $69(5)_\textrm{stat}(4)_\textrm{sys}\,\%$ using intra-cavity frequency doubled Ti:sapphire lasers. The implantation of a $^{166\textrm{m}}$Ho impurity is suppressed about five orders of magnitude by the mass separation. A dedicated implantation stage with focusing and scanning capability enhances the geometric implantation efficiency into the ECHo detectors to $20(2)\,\%$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.05559v1-abstract-full').style.display = 'none'; document.getElementById('1904.05559v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1904.01245">arXiv:1904.01245</a> <span> [<a href="https://arxiv.org/pdf/1904.01245">pdf</a>, <a href="https://arxiv.org/format/1904.01245">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10751-019-1564-0">10.1007/s10751-019-1564-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The concept of laser-based conversion electron M枚ssbauer spectroscopy for a precise energy determination of $^{229m}$Th </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=von+der+Wense%2C+L+C">Lars C. von der Wense</a>, <a href="/search/?searchtype=author&query=Seiferle%2C+B">Benedict Seiferle</a>, <a href="/search/?searchtype=author&query=Schneider%2C+C">Christian Schneider</a>, <a href="/search/?searchtype=author&query=Jeet%2C+J">Justin Jeet</a>, <a href="/search/?searchtype=author&query=Amersdorffer%2C+I">Ines Amersdorffer</a>, <a href="/search/?searchtype=author&query=Arlt%2C+N">Nicolas Arlt</a>, <a href="/search/?searchtype=author&query=Zacherl%2C+F">Florian Zacherl</a>, <a href="/search/?searchtype=author&query=Haas%2C+R">Raphael Haas</a>, <a href="/search/?searchtype=author&query=Renisch%2C+D">Dennis Renisch</a>, <a href="/search/?searchtype=author&query=Mosel%2C+P">Patrick Mosel</a>, <a href="/search/?searchtype=author&query=Mosel%2C+P">Philip Mosel</a>, <a href="/search/?searchtype=author&query=Kovacev%2C+M">Milutin Kovacev</a>, <a href="/search/?searchtype=author&query=Morgner%2C+U">Uwe Morgner</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Hudson%2C+E+R">Eric R. Hudson</a>, <a href="/search/?searchtype=author&query=Thirolf%2C+P+G">Peter G. Thirolf</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1904.01245v1-abstract-short" style="display: inline;"> $^{229}$Th is the only nucleus currently under investigation for the development of a nuclear optical clock (NOC) of ultra-high accuracy. The insufficient knowledge of the first nuclear excitation energy of $^{229}… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.01245v1-abstract-full').style.display = 'inline'; document.getElementById('1904.01245v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1904.01245v1-abstract-full" style="display: none;"> $^{229}$Th is the only nucleus currently under investigation for the development of a nuclear optical clock (NOC) of ultra-high accuracy. The insufficient knowledge of the first nuclear excitation energy of $^{229}$Th has so far hindered direct nuclear laser spectroscopy of thorium ions and thus the development of a NOC. Here, a nuclear laser excitation scheme is detailed, which makes use of thorium atoms instead of ions. This concept, besides potentially leading to the first nuclear laser spectroscopy, would determine the isomeric energy to 40 $渭$eV resolution, corresponding to 10 GHz, which is a $10^4$ times improvement compared to the current best energy constraint. This would determine the nuclear isomeric energy to a sufficient accuracy to allow for nuclear laser spectroscopy of individual thorium ions in a Paul trap and thus the development of a single-ion nuclear optical clock. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.01245v1-abstract-full').style.display = 'none'; document.getElementById('1904.01245v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Hyperfine Interact (2019) 240: 23 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1809.01358">arXiv:1809.01358</a> <span> [<a href="https://arxiv.org/pdf/1809.01358">pdf</a>, <a href="https://arxiv.org/format/1809.01358">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.5081094">10.1063/1.5081094 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Optimization of a laser ion source for $^{163}$Ho isotope separation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Kieck%2C+T">Tom Kieck</a>, <a href="/search/?searchtype=author&query=Biebricher%2C+S">Sebastian Biebricher</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Wendt%2C+K">Klaus Wendt</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1809.01358v2-abstract-short" style="display: inline;"> To measure the mass of the electron neutrino, the "Electron Capture in Holmium-163" (ECHo) collaboration aims at calorimetrically measuring the spectrum following electron capture in $^{163}$Ho. The success of the ECHo experiment depends critically on the radiochemical purity of the $^{163}$Ho sample, which is ion-implanted into the calorimeters. For this, a $30 \, \textrm{kV}$ high transmission m… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.01358v2-abstract-full').style.display = 'inline'; document.getElementById('1809.01358v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1809.01358v2-abstract-full" style="display: none;"> To measure the mass of the electron neutrino, the "Electron Capture in Holmium-163" (ECHo) collaboration aims at calorimetrically measuring the spectrum following electron capture in $^{163}$Ho. The success of the ECHo experiment depends critically on the radiochemical purity of the $^{163}$Ho sample, which is ion-implanted into the calorimeters. For this, a $30 \, \textrm{kV}$ high transmission magnetic mass separator equipped with a resonance ionization laser ion source is used. To meet the ECHo requirements, the ion source unit was optimized with respect to its thermal characteristics and material composition by means of finite element method (FEM) thermal-electric calculations and chemical equilibrium simulation using the Gibbs energy minimization method. The new setup provides a much improved selectivity in laser ionization versus interfering surface ionization of $2700(500)$ and a superior overall efficiency of $41(5) \, \textrm{%}$ for the ion-implantation process. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.01358v2-abstract-full').style.display = 'none'; document.getElementById('1809.01358v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 September, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Rev. Sci. Inst. 90, 053304 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1710.11398">arXiv:1710.11398</a> <span> [<a href="https://arxiv.org/pdf/1710.11398">pdf</a>, <a href="https://arxiv.org/format/1710.11398">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/nature17669">10.1038/nature17669 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct detection of the 229Th nuclear clock transition </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=von+der+Wense%2C+L">Lars von der Wense</a>, <a href="/search/?searchtype=author&query=Seiferle%2C+B">Benedict Seiferle</a>, <a href="/search/?searchtype=author&query=Laatiaoui%2C+M">Mustapha Laatiaoui</a>, <a href="/search/?searchtype=author&query=Neumayr%2C+J+B">J眉rgen B. Neumayr</a>, <a href="/search/?searchtype=author&query=Maier%2C+H">Hans-J枚rg Maier</a>, <a href="/search/?searchtype=author&query=Wirth%2C+H">Hans-Friedrich Wirth</a>, <a href="/search/?searchtype=author&query=Mokry%2C+C">Christoph Mokry</a>, <a href="/search/?searchtype=author&query=Runke%2C+J">J枚rg Runke</a>, <a href="/search/?searchtype=author&query=Eberhardt%2C+K">Klaus Eberhardt</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Trautmann%2C+N+G">Norbert G. Trautmann</a>, <a href="/search/?searchtype=author&query=Thirolf%2C+P+G">Peter G. Thirolf</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1710.11398v1-abstract-short" style="display: inline;"> Today's most precise time and frequency measurements are performed with optical atomic clocks. However, it has been proposed that they could potentially be outperformed by a nuclear clock, which employs a nuclear transition instead of the atomic shell transitions used so far. By today there is only one nuclear state known which could serve for a nuclear clock using currently available technology,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.11398v1-abstract-full').style.display = 'inline'; document.getElementById('1710.11398v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1710.11398v1-abstract-full" style="display: none;"> Today's most precise time and frequency measurements are performed with optical atomic clocks. However, it has been proposed that they could potentially be outperformed by a nuclear clock, which employs a nuclear transition instead of the atomic shell transitions used so far. By today there is only one nuclear state known which could serve for a nuclear clock using currently available technology, which is the isomeric first excited state in $^{229}$Th. Here we report the direct detection of this nuclear state, which is a further confirmation of the isomer's existence and lays the foundation for precise studies of the isomer's decay parameters. Based on this direct detection the isomeric energy is constrained to lie between 6.3 and 18.3 eV, and the half-life is found to be longer than 60 s for $^{229\mathrm{m}}$Th$^{2+}$. More precise determinations appear in reach and will pave the way for the development of a nuclear frequency standard. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.11398v1-abstract-full').style.display = 'none'; document.getElementById('1710.11398v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 533:47-51 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1709.05325">arXiv:1709.05325</a> <span> [<a href="https://arxiv.org/pdf/1709.05325">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41586-018-0011-8">10.1038/s41586-018-0011-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Laser spectroscopic characterization of the nuclear clock isomer $^{229m}$Th </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Thielking%2C+J">Johannes Thielking</a>, <a href="/search/?searchtype=author&query=Okhapkin%2C+M+V">Maxim V. Okhapkin</a>, <a href="/search/?searchtype=author&query=Glowacki%2C+P">Przemyslaw Glowacki</a>, <a href="/search/?searchtype=author&query=Meier%2C+D+M">David M. Meier</a>, <a href="/search/?searchtype=author&query=von+der+Wense%2C+L">Lars von der Wense</a>, <a href="/search/?searchtype=author&query=Seiferle%2C+B">Benedict Seiferle</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Christoph E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Thirolf%2C+P+G">Peter G. Thirolf</a>, <a href="/search/?searchtype=author&query=Peik%2C+E">Ekkehard Peik</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1709.05325v2-abstract-short" style="display: inline;"> The isotope $^{229}$Th is the only nucleus known to possess an excited state $^{229m}$Th in the energy range of a few electron volts, a transition energy typical for electrons in the valence shell of atoms, but about four orders of magnitude lower than common nuclear excitation energies. A number of applications of this unique nuclear system, which is accessible by optical methods, have been propo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.05325v2-abstract-full').style.display = 'inline'; document.getElementById('1709.05325v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1709.05325v2-abstract-full" style="display: none;"> The isotope $^{229}$Th is the only nucleus known to possess an excited state $^{229m}$Th in the energy range of a few electron volts, a transition energy typical for electrons in the valence shell of atoms, but about four orders of magnitude lower than common nuclear excitation energies. A number of applications of this unique nuclear system, which is accessible by optical methods, have been proposed. Most promising among them appears a highly precise nuclear clock that outperforms existing atomic timekeepers. Here we present the laser spectroscopic investigation of the hyperfine structure of $^{229m}$Th$^{2+}$, yielding values of fundamental nuclear properties, namely the magnetic dipole and electric quadrupole moments as well as the nuclear charge radius. After the recent direct detection of this long-searched-for isomer, our results now provide detailed insight into its nuclear structure and present a method for its non-destructive optical detection. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.05325v2-abstract-full').style.display = 'none'; document.getElementById('1709.05325v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 September, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 556, 321-325 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1604.04210">arXiv:1604.04210</a> <span> [<a href="https://arxiv.org/pdf/1604.04210">pdf</a>, <a href="https://arxiv.org/ps/1604.04210">ps</a>, <a href="https://arxiv.org/format/1604.04210">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.115.062501">10.1103/PhysRevLett.115.062501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct Measurement of the Mass Difference of Ho163 and Dy163 Solves the Q-Value Puzzle for the Neutrino Mass Determination </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Eliseev%2C+S">S. Eliseev</a>, <a href="/search/?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/?searchtype=author&query=Block%2C+M">M. Block</a>, <a href="/search/?searchtype=author&query=Chenmarev%2C+S">S. Chenmarev</a>, <a href="/search/?searchtype=author&query=Dorrer%2C+H">H. Dorrer</a>, <a href="/search/?searchtype=author&query=Duellmann%2C+C+E">Ch. E. Duellmann</a>, <a href="/search/?searchtype=author&query=Enss%2C+C">C. Enss</a>, <a href="/search/?searchtype=author&query=Filianin%2C+P+E">P. E. Filianin</a>, <a href="/search/?searchtype=author&query=Gastaldo%2C+L">L. Gastaldo</a>, <a href="/search/?searchtype=author&query=Goncharov%2C+M">M. Goncharov</a>, <a href="/search/?searchtype=author&query=Koester%2C+U">U. Koester</a>, <a href="/search/?searchtype=author&query=Lautenschlaeger%2C+F">F. Lautenschlaeger</a>, <a href="/search/?searchtype=author&query=Novikov%2C+Y+N">Yu. N. Novikov</a>, <a href="/search/?searchtype=author&query=Rischka%2C+A">A. Rischka</a>, <a href="/search/?searchtype=author&query=Schuessler%2C+R+X">R. X. Schuessler</a>, <a href="/search/?searchtype=author&query=Schweikhard%2C+L">L. Schweikhard</a>, <a href="/search/?searchtype=author&query=Tuerler%2C+A">A. Tuerler</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1604.04210v1-abstract-short" style="display: inline;"> The atomic mass difference of 163Ho and 163Dy has been directly measured with the Penning trap mass spectrometer SHIPTRAP applying the novel phase imaging ion cyclotron resonance technique. Our measurement has solved the long standing problem of large discrepancies in the Q value of the electron capture in 163Ho determined by different techniques. Our measured mass difference shifts the current Q… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.04210v1-abstract-full').style.display = 'inline'; document.getElementById('1604.04210v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1604.04210v1-abstract-full" style="display: none;"> The atomic mass difference of 163Ho and 163Dy has been directly measured with the Penning trap mass spectrometer SHIPTRAP applying the novel phase imaging ion cyclotron resonance technique. Our measurement has solved the long standing problem of large discrepancies in the Q value of the electron capture in 163Ho determined by different techniques. Our measured mass difference shifts the current Q value of 2555(16) eV evaluated in the Atomic Mass Evaluation 2012 [G. Audi et al., Chin. Phys. C 36, 1157 (2012)] by more than 7 sigma to 2833(30stat)(15sys) eV/c2. With the new mass difference it will be possible, e.g., to reach in the first phase of the ECHo experiment a statistical sensitivity to the neutrino mass below 10 eV, which will reduce its present upper limit by more than an order of magnitude. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.04210v1-abstract-full').style.display = 'none'; document.getElementById('1604.04210v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 April, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 115 (2015) 062501 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1602.04816">arXiv:1602.04816</a> <span> [<a href="https://arxiv.org/pdf/1602.04816">pdf</a>, <a href="https://arxiv.org/format/1602.04816">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cosmology and Nongalactic Astrophysics">astro-ph.CO</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Astrophysics of Galaxies">astro-ph.GA</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1475-7516/2017/01/025">10.1088/1475-7516/2017/01/025 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A White Paper on keV Sterile Neutrino Dark Matter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Adhikari%2C+R">R. Adhikari</a>, <a href="/search/?searchtype=author&query=Agostini%2C+M">M. Agostini</a>, <a href="/search/?searchtype=author&query=Ky%2C+N+A">N. Anh Ky</a>, <a href="/search/?searchtype=author&query=Araki%2C+T">T. Araki</a>, <a href="/search/?searchtype=author&query=Archidiacono%2C+M">M. Archidiacono</a>, <a href="/search/?searchtype=author&query=Bahr%2C+M">M. Bahr</a>, <a href="/search/?searchtype=author&query=Baur%2C+J">J. Baur</a>, <a href="/search/?searchtype=author&query=Behrens%2C+J">J. Behrens</a>, <a href="/search/?searchtype=author&query=Bezrukov%2C+F">F. Bezrukov</a>, <a href="/search/?searchtype=author&query=Dev%2C+P+S+B">P. S. Bhupal Dev</a>, <a href="/search/?searchtype=author&query=Borah%2C+D">D. Borah</a>, <a href="/search/?searchtype=author&query=Boyarsky%2C+A">A. Boyarsky</a>, <a href="/search/?searchtype=author&query=de+Gouvea%2C+A">A. de Gouvea</a>, <a href="/search/?searchtype=author&query=Pires%2C+C+A+d+S">C. A. de S. Pires</a>, <a href="/search/?searchtype=author&query=de+Vega%2C+H+J">H. J. de Vega</a>, <a href="/search/?searchtype=author&query=Dias%2C+A+G">A. G. Dias</a>, <a href="/search/?searchtype=author&query=Di+Bari%2C+P">P. Di Bari</a>, <a href="/search/?searchtype=author&query=Djurcic%2C+Z">Z. Djurcic</a>, <a href="/search/?searchtype=author&query=Dolde%2C+K">K. Dolde</a>, <a href="/search/?searchtype=author&query=Dorrer%2C+H">H. Dorrer</a>, <a href="/search/?searchtype=author&query=Durero%2C+M">M. Durero</a>, <a href="/search/?searchtype=author&query=Dragoun%2C+O">O. Dragoun</a>, <a href="/search/?searchtype=author&query=Drewes%2C+M">M. Drewes</a>, <a href="/search/?searchtype=author&query=Drexlin%2C+G">G. Drexlin</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a> , et al. (111 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1602.04816v2-abstract-short" style="display: inline;"> We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved - cosmology, astrophysics, nuclear, and particle physics - in each case viewed from both theoretical and experimental/observational perspectives. After reviewing the role of active neutrinos in particle physics, astrophysics, and cosmology, we focus on sterile ne… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1602.04816v2-abstract-full').style.display = 'inline'; document.getElementById('1602.04816v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1602.04816v2-abstract-full" style="display: none;"> We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved - cosmology, astrophysics, nuclear, and particle physics - in each case viewed from both theoretical and experimental/observational perspectives. After reviewing the role of active neutrinos in particle physics, astrophysics, and cosmology, we focus on sterile neutrinos in the context of the Dark Matter puzzle. Here, we first review the physics motivation for sterile neutrino Dark Matter, based on challenges and tensions in purely cold Dark Matter scenarios. We then round out the discussion by critically summarizing all known constraints on sterile neutrino Dark Matter arising from astrophysical observations, laboratory experiments, and theoretical considerations. In this context, we provide a balanced discourse on the possibly positive signal from X-ray observations. Another focus of the paper concerns the construction of particle physics models, aiming to explain how sterile neutrinos of keV-scale masses could arise in concrete settings beyond the Standard Model of elementary particle physics. The paper ends with an extensive review of current and future astrophysical and laboratory searches, highlighting new ideas and their experimental challenges, as well as future perspectives for the discovery of sterile neutrinos. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1602.04816v2-abstract-full').style.display = 'none'; document.getElementById('1602.04816v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 February, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 February, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">v2: 257 pages, 57 figures, content matches published version [JCAP01(2017)025]; over 100 authors from several different communities</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1502.03030">arXiv:1502.03030</a> <span> [<a href="https://arxiv.org/pdf/1502.03030">pdf</a>, <a href="https://arxiv.org/ps/1502.03030">ps</a>, <a href="https://arxiv.org/format/1502.03030">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nuclphysa.2016.04.025">10.1016/j.nuclphysa.2016.04.025 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Recoil-alpha-fission and recoil-alpha-alpha-fission events observed in the reaction Ca-48 + Am-243 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Forsberg%2C+U">U. Forsberg</a>, <a href="/search/?searchtype=author&query=Rudolph%2C+D">D. Rudolph</a>, <a href="/search/?searchtype=author&query=Andersson%2C+L+-">L. -L. Andersson</a>, <a href="/search/?searchtype=author&query=Di+Nitto%2C+A">A. Di Nitto</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Gates%2C+J+M">J. M. Gates</a>, <a href="/search/?searchtype=author&query=Golubev%2C+P">P. Golubev</a>, <a href="/search/?searchtype=author&query=Gregorich%2C+K+E">K. E. Gregorich</a>, <a href="/search/?searchtype=author&query=Gross%2C+C+J">C. J. Gross</a>, <a href="/search/?searchtype=author&query=Herzberg%2C+R+-">R. -D. Herzberg</a>, <a href="/search/?searchtype=author&query=Hessberger%2C+F+P">F. P. Hessberger</a>, <a href="/search/?searchtype=author&query=Khuyagbaatar%2C+J">J. Khuyagbaatar</a>, <a href="/search/?searchtype=author&query=Kratz%2C+J+V">J. V. Kratz</a>, <a href="/search/?searchtype=author&query=Rykaczewski%2C+K">K. Rykaczewski</a>, <a href="/search/?searchtype=author&query=Sarmiento%2C+L+G">L. G. Sarmiento</a>, <a href="/search/?searchtype=author&query=Sch%C3%A4del%2C+M">M. Sch盲del</a>, <a href="/search/?searchtype=author&query=Yakushev%2C+A">A. Yakushev</a>, <a href="/search/?searchtype=author&query=%C3%85berg%2C+S">S. 脜berg</a>, <a href="/search/?searchtype=author&query=Ackermann%2C+D">D. Ackermann</a>, <a href="/search/?searchtype=author&query=Block%2C+M">M. Block</a>, <a href="/search/?searchtype=author&query=Brand%2C+H">H. Brand</a>, <a href="/search/?searchtype=author&query=Carlsson%2C+B+G">B. G. Carlsson</a>, <a href="/search/?searchtype=author&query=Cox%2C+D">D. Cox</a>, <a href="/search/?searchtype=author&query=Derkx%2C+X">X. Derkx</a>, <a href="/search/?searchtype=author&query=Dobaczewski%2C+J">J. Dobaczewski</a> , et al. (29 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1502.03030v1-abstract-short" style="display: inline;"> Products of the fusion-evaporation reaction Ca-48 + Am-243 were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum f眉r Schwerionenforschung. Amongst the detected thirty correlated alpha-decay chains associated with the production of element Z=115, two recoil-alpha-fission and five recoil-alpha-alpha-fission events were observed. The latter are similar to… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.03030v1-abstract-full').style.display = 'inline'; document.getElementById('1502.03030v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1502.03030v1-abstract-full" style="display: none;"> Products of the fusion-evaporation reaction Ca-48 + Am-243 were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum f眉r Schwerionenforschung. Amongst the detected thirty correlated alpha-decay chains associated with the production of element Z=115, two recoil-alpha-fission and five recoil-alpha-alpha-fission events were observed. The latter are similar to four such events reported from experiments performed at the Dubna gas-filled separator. Contrary to their interpretation, we propose an alternative view, namely to assign eight of these eleven decay chains of recoil-alpha(-alpha)-fission type to start from the 3n-evaporation channel 115-288. The other three decay chains remain viable candidates for the 2n-evaporation channel 115-289. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.03030v1-abstract-full').style.display = 'none'; document.getElementById('1502.03030v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 February, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages. Article: 9 pages, 3 tables, 3 figures. Supplemental material: 6 pages, 7 tables, 1 figure. Submitted to PRC</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1406.6477">arXiv:1406.6477</a> <span> [<a href="https://arxiv.org/pdf/1406.6477">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1126/science.1225636">10.1126/science.1225636 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct mapping of nuclear shell effects in the heaviest elements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Ramirez%2C+E+M">E. Minaya Ramirez</a>, <a href="/search/?searchtype=author&query=Ackermann%2C+D">D. Ackermann</a>, <a href="/search/?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/?searchtype=author&query=Block%2C+M">M. Block</a>, <a href="/search/?searchtype=author&query=Droese%2C+C">C. Droese</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Dworschak%2C+M">M. Dworschak</a>, <a href="/search/?searchtype=author&query=Eibach%2C+M">M. Eibach</a>, <a href="/search/?searchtype=author&query=Eliseev%2C+S">S. Eliseev</a>, <a href="/search/?searchtype=author&query=Haettner%2C+E">E. Haettner</a>, <a href="/search/?searchtype=author&query=Herfurth%2C+F">F. Herfurth</a>, <a href="/search/?searchtype=author&query=He%C3%9Fberger%2C+F+P">F. P. He脽berger</a>, <a href="/search/?searchtype=author&query=Hofmann%2C+S">S. Hofmann</a>, <a href="/search/?searchtype=author&query=Ketelaer%2C+J">J. Ketelaer</a>, <a href="/search/?searchtype=author&query=Marx%2C+G">G. Marx</a>, <a href="/search/?searchtype=author&query=Mazzocco%2C+M">M. Mazzocco</a>, <a href="/search/?searchtype=author&query=Nesterenko%2C+D">D. Nesterenko</a>, <a href="/search/?searchtype=author&query=Novikov%2C+Y+N">Yu. N. Novikov</a>, <a href="/search/?searchtype=author&query=Pla%C3%9F%2C+W+R">W. R. Pla脽</a>, <a href="/search/?searchtype=author&query=Rodr%C3%ADguez%2C+D">D. Rodr铆guez</a>, <a href="/search/?searchtype=author&query=Scheidenberger%2C+C">C. Scheidenberger</a>, <a href="/search/?searchtype=author&query=Schweikhard%2C+L">L. Schweikhard</a>, <a href="/search/?searchtype=author&query=Thirolf%2C+P+G">P. G. Thirolf</a>, <a href="/search/?searchtype=author&query=Weber%2C+C">C. Weber</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1406.6477v1-abstract-short" style="display: inline;"> Quantum-mechanical shell effects are expected to strongly enhance nuclear binding on an "island of stability" of superheavy elements. The predicted center at proton number $Z=114,120$, or $126$ and neutron number $N=184$ has been substantiated by the recent synthesis of new elements up to $Z=118$. However the location of the center and the extension of the island of stability remain vague. High-pr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.6477v1-abstract-full').style.display = 'inline'; document.getElementById('1406.6477v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1406.6477v1-abstract-full" style="display: none;"> Quantum-mechanical shell effects are expected to strongly enhance nuclear binding on an "island of stability" of superheavy elements. The predicted center at proton number $Z=114,120$, or $126$ and neutron number $N=184$ has been substantiated by the recent synthesis of new elements up to $Z=118$. However the location of the center and the extension of the island of stability remain vague. High-precision mass spectrometry allows the direct measurement of nuclear binding energies and thus the determination of the strength of shell effects. Here, we present such measurements for nobelium and lawrencium isotopes, which also pin down the deformed shell gap at $N=152$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.6477v1-abstract-full').style.display = 'none'; document.getElementById('1406.6477v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 June, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> E.M. Ramirez, Science, 337 (2012) 1207 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1309.5214">arXiv:1309.5214</a> <span> [<a href="https://arxiv.org/pdf/1309.5214">pdf</a>, <a href="https://arxiv.org/ps/1309.5214">ps</a>, <a href="https://arxiv.org/format/1309.5214">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10909-014-1187-4">10.1007/s10909-014-1187-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Electron Capture $^{163}$Ho Experiment ECHo: an overview </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Gastaldo%2C+L">L. Gastaldo</a>, <a href="/search/?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/?searchtype=author&query=Doerr%2C+A">A. Doerr</a>, <a href="/search/?searchtype=author&query=Duellmann%2C+C+E">Ch. E. Duellmann</a>, <a href="/search/?searchtype=author&query=Eberhardt%2C+K">K. Eberhardt</a>, <a href="/search/?searchtype=author&query=Eliseev%2C+S">S. Eliseev</a>, <a href="/search/?searchtype=author&query=Enss%2C+C">C. Enss</a>, <a href="/search/?searchtype=author&query=Faessler%2C+A">Amand Faessler</a>, <a href="/search/?searchtype=author&query=Fleischmann%2C+A">A. Fleischmann</a>, <a href="/search/?searchtype=author&query=Kempf%2C+S">S. Kempf</a>, <a href="/search/?searchtype=author&query=Krivoruchenko%2C+M">M. Krivoruchenko</a>, <a href="/search/?searchtype=author&query=Lahiri%2C+S">S. Lahiri</a>, <a href="/search/?searchtype=author&query=Maiti%2C+M">M. Maiti</a>, <a href="/search/?searchtype=author&query=Novikov%2C+Y+N">Yu. N. Novikov</a>, <a href="/search/?searchtype=author&query=Ranitzsch%2C+P+C+-">P. C. -O. Ranitzsch</a>, <a href="/search/?searchtype=author&query=Simkovic%2C+F">F. Simkovic</a>, <a href="/search/?searchtype=author&query=Szusc%2C+Z">Z. Szusc</a>, <a href="/search/?searchtype=author&query=Wegner%2C+M">M. Wegner</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1309.5214v1-abstract-short" style="display: inline;"> The determination of the absolute scale of the neutrino masses is one of the most challenging present questions in particle physics. The most stringent limit, $m(\bar谓_{\mathrm{e}})<2$eV, was achieved for the electron anti-neutrino mass \cite{numass}. Different approaches are followed to achieve a sensitivity on neutrino masses in the sub-eV range. Among them, experiments exploring the beta decay… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1309.5214v1-abstract-full').style.display = 'inline'; document.getElementById('1309.5214v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1309.5214v1-abstract-full" style="display: none;"> The determination of the absolute scale of the neutrino masses is one of the most challenging present questions in particle physics. The most stringent limit, $m(\bar谓_{\mathrm{e}})<2$eV, was achieved for the electron anti-neutrino mass \cite{numass}. Different approaches are followed to achieve a sensitivity on neutrino masses in the sub-eV range. Among them, experiments exploring the beta decay or electron capture of suitable nuclides can provide information on the electron neutrino mass value. We present the Electron Capture $^{163}$Ho experiment ECHo, which aims to investigate the electron neutrino mass in the sub-eV range by means of the analysis of the calorimetrically measured energy spectrum following electron capture of $^{163}$Ho. A high precision and high statistics spectrum will be measured with arrays of metallic magnetic calorimeters. We discuss some of the essential aspects of ECHo to reach the proposed sensitivity: detector optimization and performance, multiplexed readout, $^{163}$Ho source production and purification, as well as a precise theoretical and experimental parameterization of the calorimetric EC spectrum including in particular the value of $Q_{\mathrm{EC}}$. We present preliminary results obtained with a first prototype of single channel detectors as well as a first 64-pixel chip with integrated micro-wave SQUID multiplexer, which will already allow to investigate $m(谓_{\mathrm{e}})$ in the eV range. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1309.5214v1-abstract-full').style.display = 'none'; document.getElementById('1309.5214v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 September, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Contribution to the LTD15 Conference Proceedings</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1306.2655">arXiv:1306.2655</a> <span> [<a href="https://arxiv.org/pdf/1306.2655">pdf</a>, <a href="https://arxiv.org/ps/1306.2655">ps</a>, <a href="https://arxiv.org/format/1306.2655">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> </div> <p class="title is-5 mathjax"> The Electron Capture $^{163}$Ho Experiment ECHo </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/?searchtype=author&query=Doerr%2C+A">A. Doerr</a>, <a href="/search/?searchtype=author&query=Duellmann%2C+C+E">C. E. Duellmann</a>, <a href="/search/?searchtype=author&query=Eberhardt%2C+K">K. Eberhardt</a>, <a href="/search/?searchtype=author&query=Eliseev%2C+S">S. Eliseev</a>, <a href="/search/?searchtype=author&query=Enss%2C+C">C. Enss</a>, <a href="/search/?searchtype=author&query=Faessler%2C+A">A. Faessler</a>, <a href="/search/?searchtype=author&query=Fleischmann%2C+A">A. Fleischmann</a>, <a href="/search/?searchtype=author&query=Gastaldo%2C+L">L. Gastaldo</a>, <a href="/search/?searchtype=author&query=Kempf%2C+S">S. Kempf</a>, <a href="/search/?searchtype=author&query=Krivoruchenko%2C+M">M. Krivoruchenko</a>, <a href="/search/?searchtype=author&query=Lahiri%2C+S">S. Lahiri</a>, <a href="/search/?searchtype=author&query=Maiti%2C+M">M. Maiti</a>, <a href="/search/?searchtype=author&query=Novikov%2C+Y+N">Yu. N. Novikov</a>, <a href="/search/?searchtype=author&query=Ranitzsch%2C+P+C+-">P. C. -O. Ranitzsch</a>, <a href="/search/?searchtype=author&query=Simkovic%2C+F">F. Simkovic</a>, <a href="/search/?searchtype=author&query=Szusc%2C+Z">Z. Szusc</a>, <a href="/search/?searchtype=author&query=Wegner%2C+M">M. Wegner</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1306.2655v1-abstract-short" style="display: inline;"> The determination of the absolute scale of the neutrino masses is one of the most challenging questions in particle physics. Different approaches are followed to achieve a sensitivity on neutrino masses in the sub-eV range. Among them, experiments exploring the beta decay and electron capture processes of suitable nuclides can provide necessary information on the electron neutrino mass value. In t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.2655v1-abstract-full').style.display = 'inline'; document.getElementById('1306.2655v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1306.2655v1-abstract-full" style="display: none;"> The determination of the absolute scale of the neutrino masses is one of the most challenging questions in particle physics. Different approaches are followed to achieve a sensitivity on neutrino masses in the sub-eV range. Among them, experiments exploring the beta decay and electron capture processes of suitable nuclides can provide necessary information on the electron neutrino mass value. In this talk we present the Electron Capture 163-Ho experiment ECHo, which aims to investigate the electron neutrino mass in the sub-eV range by means of the analysis of the calorimetrically measured energy spectrum following the electron capture process of 163-Ho. A high precision and high statistics spectrum will be measured by means of low temperature magnetic calorimeter arrays. We present preliminary results obtained with a first prototype of single channel detectors as well as the participating groups and their on-going developments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.2655v1-abstract-full').style.display = 'none'; document.getElementById('1306.2655v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 June, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Part of the white paper for the NuMass 2013 Workshop (Milano, Italy 4-7 February 2013)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1209.5174">arXiv:1209.5174</a> <span> [<a href="https://arxiv.org/pdf/1209.5174">pdf</a>, <a href="https://arxiv.org/format/1209.5174">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.86.044604">10.1103/PhysRevC.86.044604 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Q value and half-life of double-electron capture in Os-184 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Smorra%2C+C">C. Smorra</a>, <a href="/search/?searchtype=author&query=Rodriguez%2C+T+R">T. R. Rodriguez</a>, <a href="/search/?searchtype=author&query=Beyer%2C+T">T. Beyer</a>, <a href="/search/?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/?searchtype=author&query=Block%2C+M">M. Block</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Eberhardt%2C+K">K. Eberhardt</a>, <a href="/search/?searchtype=author&query=Eibach%2C+M">M. Eibach</a>, <a href="/search/?searchtype=author&query=Eliseev%2C+S">S. Eliseev</a>, <a href="/search/?searchtype=author&query=Langanke%2C+K">K. Langanke</a>, <a href="/search/?searchtype=author&query=Martinez-Pinedo%2C+G">G. Martinez-Pinedo</a>, <a href="/search/?searchtype=author&query=Nagy%2C+S">Sz. Nagy</a>, <a href="/search/?searchtype=author&query=N%C3%B6rtersh%C3%A4user%2C+W">W. N枚rtersh盲user</a>, <a href="/search/?searchtype=author&query=Renisch%2C+D">D. Renisch</a>, <a href="/search/?searchtype=author&query=Shabaev%2C+V+M">V. M. Shabaev</a>, <a href="/search/?searchtype=author&query=Tupitsyn%2C+I+I">I. I. Tupitsyn</a>, <a href="/search/?searchtype=author&query=Zubova%2C+N+A">N. A. Zubova</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1209.5174v1-abstract-short" style="display: inline;"> Os-184 has been excluded as a promising candidate for the search of neutrinoless double-electron capture. High-precision mass measurements with the Penning-trap mass spectrometer TRIGA-TRAP resulted in a marginal resonant enhancement with = -8.89(58) keV excess energy to the 1322.152(22) keV 0+ excited state in W-184. State-of-the-art energy density functional calculations are applied for the eval… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1209.5174v1-abstract-full').style.display = 'inline'; document.getElementById('1209.5174v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1209.5174v1-abstract-full" style="display: none;"> Os-184 has been excluded as a promising candidate for the search of neutrinoless double-electron capture. High-precision mass measurements with the Penning-trap mass spectrometer TRIGA-TRAP resulted in a marginal resonant enhancement with = -8.89(58) keV excess energy to the 1322.152(22) keV 0+ excited state in W-184. State-of-the-art energy density functional calculations are applied for the evaluation of the nuclear matrix elements to the excited states predicting a strong suppression due to the large deformation of mother and daughter states. The half-life of the transition in Os-184 exceeds T_{1/2} > 1.3 10^{29} years for an effective neutrino mass of 1 eV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1209.5174v1-abstract-full').style.display = 'none'; document.getElementById('1209.5174v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 September, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">accepted in Phys. Rev. C</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1201.4942">arXiv:1201.4942</a> <span> [<a href="https://arxiv.org/pdf/1201.4942">pdf</a>, <a href="https://arxiv.org/ps/1201.4942">ps</a>, <a href="https://arxiv.org/format/1201.4942">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.85.027601">10.1103/PhysRevC.85.027601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct mass measurements of cadmium and palladium isotopes and their double-beta transition Q-values </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Smorra%2C+C">C. Smorra</a>, <a href="/search/?searchtype=author&query=Beyer%2C+T">T. Beyer</a>, <a href="/search/?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/?searchtype=author&query=Block%2C+M">M. Block</a>, <a href="/search/?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a>, <a href="/search/?searchtype=author&query=Eberhardt%2C+K">K. Eberhardt</a>, <a href="/search/?searchtype=author&query=Eibach%2C+M">M. Eibach</a>, <a href="/search/?searchtype=author&query=Eliseev%2C+S">S. Eliseev</a>, <a href="/search/?searchtype=author&query=Nagy%2C+S">Sz. Nagy</a>, <a href="/search/?searchtype=author&query=N%C3%B6rtersh%C3%A4user%2C+W">W. N枚rtersh盲user</a>, <a href="/search/?searchtype=author&query=Renisch%2C+D">D. Renisch</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1201.4942v2-abstract-short" style="display: inline;"> The Q-value of the double-electron capture in Cd-108 has been determined to be (272.04 +/- 0.55) keV in a direct measurement with the double-Penning trap mass spectrometer TRIGA-TRAP. Based on this result a resonant enhancement of the decay rate of Cd-108 is excluded. We have confirmed the double-beta transition Q-values of Cd-106 and Pd-110 recently measured with the Penning-trap mass spectromete… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.4942v2-abstract-full').style.display = 'inline'; document.getElementById('1201.4942v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1201.4942v2-abstract-full" style="display: none;"> The Q-value of the double-electron capture in Cd-108 has been determined to be (272.04 +/- 0.55) keV in a direct measurement with the double-Penning trap mass spectrometer TRIGA-TRAP. Based on this result a resonant enhancement of the decay rate of Cd-108 is excluded. We have confirmed the double-beta transition Q-values of Cd-106 and Pd-110 recently measured with the Penning-trap mass spectrometers SHIPTRAP and ISOLTRAP, respectively. Furthermore, the atomic masses of the involved nuclides Cd-106, Cd-108, Cd-110, Pd-106, Pd-108 and Pd-110 have been directly linked to the atomic mass standard. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.4942v2-abstract-full').style.display = 'none'; document.getElementById('1201.4942v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 January, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 January, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted for publication in Phys. Rev. C as brief report</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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