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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.05145">arXiv:2403.05145</a> <span> [<a href="https://arxiv.org/pdf/2403.05145">pdf</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/10.1080/10619127.2023.2198913">10.1080/10619127.2023.2198913 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Investigating the Proton Structure: The FAMU experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Vacchi%2C+A">A. Vacchi</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Baruzzo%2C+M">M. Baruzzo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Cabrera%2C+H">H. Cabrera</a>, <a href="/search/physics?searchtype=author&query=Carsi%2C+S">S. Carsi</a>, <a href="/search/physics?searchtype=author&query=Cirrincione%2C+D">D. Cirrincione</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">F. Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Vecchi%2C+C">C. De Vecchi</a>, <a href="/search/physics?searchtype=author&query=De+Vincenzi%2C+M">M. De Vincenzi</a>, <a href="/search/physics?searchtype=author&query=Fasci%2C+E">E. Fasci</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Gianfrani%2C+L">L. Gianfrani</a>, <a href="/search/physics?searchtype=author&query=Hillier%2C+A+D">A. D. Hillier</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/physics?searchtype=author&query=King%2C+P+J+C">P. J. C. King</a> , et al. (24 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="2403.05145v1-abstract-short" style="display: inline;"> The article gives the motivations for the measurement of the hyperfine splitting (hfs) in the ground state of muonic hydrogen to explore the properties of the proton at low momentum transfer. It summarizes these proposed measurement methods and finally describes the FAMU experiment in more detail. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.05145v1-abstract-full" style="display: none;"> The article gives the motivations for the measurement of the hyperfine splitting (hfs) in the ground state of muonic hydrogen to explore the properties of the proton at low momentum transfer. It summarizes these proposed measurement methods and finally describes the FAMU experiment in more detail. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.05145v1-abstract-full').style.display = 'none'; document.getElementById('2403.05145v1-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 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Physics News 33:4, 9-16, 2023 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.04987">arXiv:2312.04987</a> <span> [<a href="https://arxiv.org/pdf/2312.04987">pdf</a>, <a href="https://arxiv.org/format/2312.04987">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="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/10.1088/1748-0221/19/02/C02034">10.1088/1748-0221/19/02/C02034 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Status of the detector setup for the FAMU experiment at RIKEN-RAL for a precision measurement of the Zemach radius of the proton in muonic hydrogen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Rossini%2C+R">R. Rossini</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Banfi%2C+S">S. Banfi</a>, <a href="/search/physics?searchtype=author&query=Baruzzo%2C+M">M. Baruzzo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">V. Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Cabrera%2C+H">H. Cabrera</a>, <a href="/search/physics?searchtype=author&query=Carsi%2C+S">S. Carsi</a>, <a href="/search/physics?searchtype=author&query=Cirrincione%2C+D">D. Cirrincione</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M+B">M. B. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=de+Vecchi%2C+C">C. de Vecchi</a>, <a href="/search/physics?searchtype=author&query=Fasci%2C+E">E. Fasci</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Gaigher%2C+R">R. Gaigher</a>, <a href="/search/physics?searchtype=author&query=Gianfrani%2C+L">L. Gianfrani</a>, <a href="/search/physics?searchtype=author&query=Hillier%2C+A+D">A. D. Hillier</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a> , et al. (24 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="2312.04987v1-abstract-short" style="display: inline;"> The FAMU experiment at RIKEN-RAL is a muonic atom experiment with the aim to determine the Zemach radius of the proton by measuring the 1s hyperfine splitting in muonic hydrogen. The activity of the FAMU Collaboration in the years 2015-2023 enabled the final optimisation of the detector-target setup as well as the gas working condition in terms of temperature, pressure and gas mixture composition.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.04987v1-abstract-full').style.display = 'inline'; document.getElementById('2312.04987v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.04987v1-abstract-full" style="display: none;"> The FAMU experiment at RIKEN-RAL is a muonic atom experiment with the aim to determine the Zemach radius of the proton by measuring the 1s hyperfine splitting in muonic hydrogen. The activity of the FAMU Collaboration in the years 2015-2023 enabled the final optimisation of the detector-target setup as well as the gas working condition in terms of temperature, pressure and gas mixture composition. The experiment has started its data taking in July 2023. The status of the detector setup for the 2023 experimental runs, for the beam characterisation and muonic X-ray detection in the 100-200 keV energy range, is presented and discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.04987v1-abstract-full').style.display = 'none'; document.getElementById('2312.04987v1-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">Submitted to JINST</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.15575">arXiv:2303.15575</a> <span> [<a href="https://arxiv.org/pdf/2303.15575">pdf</a>, <a href="https://arxiv.org/ps/2303.15575">ps</a>, <a href="https://arxiv.org/format/2303.15575">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/10.1103/PhysRevA.107.032823">10.1103/PhysRevA.107.032823 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Experimental determination of the energy dependence of the rate of the muon transfer reaction from muonic hydrogen to oxygen for collision energies up to 0.1 eV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Stoilov%2C+M">M. Stoilov</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=Mocchiutti%2C+E">E. Mocchiutti</a>, <a href="/search/physics?searchtype=author&query=Pizzolotto%2C+C">C. Pizzolotto</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Baruzzo%2C+M">M. Baruzzo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Cirrincione%2C+D">D. Cirrincione</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Fuschino%2C+F">F. Fuschino</a>, <a href="/search/physics?searchtype=author&query=Hillier%2C+A+D">A. D. Hillier</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/physics?searchtype=author&query=King%2C+P+J+C">P. J. C. King</a>, <a href="/search/physics?searchtype=author&query=Menegolli%2C+A">A. Menegolli</a>, <a href="/search/physics?searchtype=author&query=Monzani%2C+S">S. Monzani</a>, <a href="/search/physics?searchtype=author&query=Ramponi%2C+R">R. Ramponi</a>, <a href="/search/physics?searchtype=author&query=Rignanese%2C+L+P">L. P. Rignanese</a>, <a href="/search/physics?searchtype=author&query=Sarkar%2C+R">R. Sarkar</a>, <a href="/search/physics?searchtype=author&query=Sbrizzi%2C+A">A. Sbrizzi</a>, <a href="/search/physics?searchtype=author&query=Tortora%2C+L">L. Tortora</a>, <a href="/search/physics?searchtype=author&query=Vallazza%2C+E">E. Vallazza</a>, <a href="/search/physics?searchtype=author&query=Vacchi%2C+A">A. Vacchi</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="2303.15575v1-abstract-short" style="display: inline;"> We report the first experimental determination of the collision-energy dependence of the muon transfer rate from the ground state of muonic hydrogen to oxygen at near-thermal energies. A sharp increase by nearly an order of magnitude in the energy range 0 - 70 meV was found that is not observed in other gases. The results set a reliable reference for quantum-mechanical calculations of low-energy p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.15575v1-abstract-full').style.display = 'inline'; document.getElementById('2303.15575v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.15575v1-abstract-full" style="display: none;"> We report the first experimental determination of the collision-energy dependence of the muon transfer rate from the ground state of muonic hydrogen to oxygen at near-thermal energies. A sharp increase by nearly an order of magnitude in the energy range 0 - 70 meV was found that is not observed in other gases. The results set a reliable reference for quantum-mechanical calculations of low-energy processes with exotic atoms, and provide firm ground for the measurement of the hyperfine splitting in muonic hydrogen and the determination of the Zemach radius of the proton by the FAMU collaboration. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.15575v1-abstract-full').style.display = 'none'; document.getElementById('2303.15575v1-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 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">30 pages, 10 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 107, 032823, 2023 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.08297">arXiv:2211.08297</a> <span> [<a href="https://arxiv.org/pdf/2211.08297">pdf</a>, <a href="https://arxiv.org/format/2211.08297">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="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Diffusion of muonic hydrogen in hydrogen gas and the measurement of the 1$s$ hyperfine splitting of muonic hydrogen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Nuber%2C+J">J. Nuber</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Ahmed%2C+M+A">M. Abdou Ahmed</a>, <a href="/search/physics?searchtype=author&query=Affolter%2C+L">L. Affolter</a>, <a href="/search/physics?searchtype=author&query=Amaro%2C+F+D">F. D. Amaro</a>, <a href="/search/physics?searchtype=author&query=Amaro%2C+P">P. Amaro</a>, <a href="/search/physics?searchtype=author&query=Carvalho%2C+P">P. Carvalho</a>, <a href="/search/physics?searchtype=author&query=Chang%2C+Y+-">Y. -H. Chang</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+T+-">T. -L. Chen</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+W+-">W. -L. Chen</a>, <a href="/search/physics?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a>, <a href="/search/physics?searchtype=author&query=Ferro%2C+M">M. Ferro</a>, <a href="/search/physics?searchtype=author&query=Goeldi%2C+D">D. Goeldi</a>, <a href="/search/physics?searchtype=author&query=Graf%2C+T">T. Graf</a>, <a href="/search/physics?searchtype=author&query=Guerra%2C+M">M. Guerra</a>, <a href="/search/physics?searchtype=author&query=H%C3%A4nsch%2C+T+W">T. W. H盲nsch</a>, <a href="/search/physics?searchtype=author&query=Henriques%2C+C+A+O">C. A. O. Henriques</a>, <a href="/search/physics?searchtype=author&query=Hildebrandt%2C+M">M. Hildebrandt</a>, <a href="/search/physics?searchtype=author&query=Indelicato%2C+P">P. Indelicato</a>, <a href="/search/physics?searchtype=author&query=Kara%2C+O">O. Kara</a>, <a href="/search/physics?searchtype=author&query=Kirch%2C+K">K. Kirch</a>, <a href="/search/physics?searchtype=author&query=Knecht%2C+A">A. Knecht</a>, <a href="/search/physics?searchtype=author&query=Kottmann%2C+F">F. Kottmann</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+Y+-">Y. -W. Liu</a>, <a href="/search/physics?searchtype=author&query=Machado%2C+J">J. Machado</a> , et al. (24 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="2211.08297v3-abstract-short" style="display: inline;"> The CREMA collaboration is pursuing a measurement of the ground-state hyperfine splitting (HFS) in muonic hydrogen ($渭$p) with 1 ppm accuracy by means of pulsed laser spectroscopy. In the proposed experiment, the $渭$p atom is excited by a laser pulse from the singlet to the triplet hyperfine sub-levels, and is quenched back to the singlet state by an inelastic collision with a H$_2$ molecule. The… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.08297v3-abstract-full').style.display = 'inline'; document.getElementById('2211.08297v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.08297v3-abstract-full" style="display: none;"> The CREMA collaboration is pursuing a measurement of the ground-state hyperfine splitting (HFS) in muonic hydrogen ($渭$p) with 1 ppm accuracy by means of pulsed laser spectroscopy. In the proposed experiment, the $渭$p atom is excited by a laser pulse from the singlet to the triplet hyperfine sub-levels, and is quenched back to the singlet state by an inelastic collision with a H$_2$ molecule. The resulting increase of kinetic energy after this cycle modifies the $渭$p atom diffusion in the hydrogen gas and the arrival time of the $渭$p atoms at the target walls. This laser-induced modification of the arrival times is used to expose the atomic transition. In this paper we present the simulation of the $渭$p diffusion in the H$_2$ gas which is at the core of the experimental scheme. These simulations have been implemented with the Geant4 framework by introducing various low-energy processes including the motion of the H$_2$ molecules, i.e. the effects related with the hydrogen target temperature. The simulations have been used to optimize the hydrogen target parameters (pressure, temperatures and thickness) and to estimate signal and background rates. These rates allow to estimate the maximum time needed to find the resonance and the statistical accuracy of the spectroscopy experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.08297v3-abstract-full').style.display = 'none'; document.getElementById('2211.08297v3-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 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">Submission to SciPost</span> </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/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Antognini%2C+A">A. Antognini</a>, <a href="/search/physics?searchtype=author&query=Berger%2C+N">N. Berger</a>, <a href="/search/physics?searchtype=author&query=Cocolios%2C+T+E">T. E. Cocolios</a>, <a href="/search/physics?searchtype=author&query=Deokar%2C+N">N. Deokar</a>, <a href="/search/physics?searchtype=author&query=D%C3%BCllmann%2C+C+E">Ch. E. D眉llmann</a>, <a href="/search/physics?searchtype=author&query=Eggenberger%2C+A">A. Eggenberger</a>, <a href="/search/physics?searchtype=author&query=Eichler%2C+R">R. Eichler</a>, <a href="/search/physics?searchtype=author&query=Heines%2C+M">M. Heines</a>, <a href="/search/physics?searchtype=author&query=Hess%2C+H">H. Hess</a>, <a href="/search/physics?searchtype=author&query=Indelicato%2C+P">P. Indelicato</a>, <a href="/search/physics?searchtype=author&query=Kirch%2C+K">K. Kirch</a>, <a href="/search/physics?searchtype=author&query=Knecht%2C+A">A. Knecht</a>, <a href="/search/physics?searchtype=author&query=Krauth%2C+J+J">J. J. Krauth</a>, <a href="/search/physics?searchtype=author&query=Nuber%2C+J">J. Nuber</a>, <a href="/search/physics?searchtype=author&query=Ouf%2C+A">A. Ouf</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">A. Papa</a>, <a href="/search/physics?searchtype=author&query=Pohl%2C+R">R. Pohl</a>, <a href="/search/physics?searchtype=author&query=Rapisarda%2C+E">E. Rapisarda</a>, <a href="/search/physics?searchtype=author&query=Reiter%2C+P">P. Reiter</a>, <a href="/search/physics?searchtype=author&query=Ritjoho%2C+N">N. Ritjoho</a>, <a href="/search/physics?searchtype=author&query=Roccia%2C+S">S. Roccia</a>, <a href="/search/physics?searchtype=author&query=Seidlitz%2C+M">M. Seidlitz</a>, <a href="/search/physics?searchtype=author&query=Severijns%2C+N">N. Severijns</a>, <a href="/search/physics?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/2112.00138">arXiv:2112.00138</a> <span> [<a href="https://arxiv.org/pdf/2112.00138">pdf</a>, <a href="https://arxiv.org/format/2112.00138">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/10.21468/SciPostPhys.13.2.020">10.21468/SciPostPhys.13.2.020 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Laser excitation of the 1s-hyperfine transition in muonic hydrogen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Amaro%2C+P">P. Amaro</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Ahmed%2C+M+A">M. Abdou Ahmed</a>, <a href="/search/physics?searchtype=author&query=Affolter%2C+L">L. Affolter</a>, <a href="/search/physics?searchtype=author&query=Amaro%2C+F+D">F. D. Amaro</a>, <a href="/search/physics?searchtype=author&query=Carvalho%2C+P">P. Carvalho</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+T+-">T. -L. Chen</a>, <a href="/search/physics?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a>, <a href="/search/physics?searchtype=author&query=Ferro%2C+M">M. Ferro</a>, <a href="/search/physics?searchtype=author&query=Goeldi%2C+D">D. Goeldi</a>, <a href="/search/physics?searchtype=author&query=Graf%2C+T">T. Graf</a>, <a href="/search/physics?searchtype=author&query=Guerra%2C+M">M. Guerra</a>, <a href="/search/physics?searchtype=author&query=H%C3%A4nsch%2C+T+W">T. W. H盲nsch</a>, <a href="/search/physics?searchtype=author&query=Henriques%2C+C+A+O">C. A. O. Henriques</a>, <a href="/search/physics?searchtype=author&query=Huang%2C+Y+-">Y. -C. Huang</a>, <a href="/search/physics?searchtype=author&query=Indelicato%2C+P">P. Indelicato</a>, <a href="/search/physics?searchtype=author&query=Kara%2C+O">O. Kara</a>, <a href="/search/physics?searchtype=author&query=Kirch%2C+K">K. Kirch</a>, <a href="/search/physics?searchtype=author&query=Knecht%2C+A">A. Knecht</a>, <a href="/search/physics?searchtype=author&query=Kottmann%2C+F">F. Kottmann</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+Y+-">Y. -W. Liu</a>, <a href="/search/physics?searchtype=author&query=Machado%2C+J">J. Machado</a>, <a href="/search/physics?searchtype=author&query=Marszalek%2C+M">M. Marszalek</a>, <a href="/search/physics?searchtype=author&query=Mano%2C+R+D+P">R. D. P. Mano</a>, <a href="/search/physics?searchtype=author&query=Monteiro%2C+C+M+B">C. M. B. Monteiro</a> , et al. (21 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="2112.00138v3-abstract-short" style="display: inline;"> The CREMA collaboration is pursuing a measurement of the ground-state hyperfine splitting (HFS) in muonic hydrogen ($渭$p) with 1 ppm accuracy by means of pulsed laser spectroscopy to determine the two-photon-exchange contribution with $2\times10^{-4}$ relative accuracy. In the proposed experiment, the $渭$p atom undergoes a laser excitation from the singlet hyperfine state to the triplet hyperfine… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.00138v3-abstract-full').style.display = 'inline'; document.getElementById('2112.00138v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.00138v3-abstract-full" style="display: none;"> The CREMA collaboration is pursuing a measurement of the ground-state hyperfine splitting (HFS) in muonic hydrogen ($渭$p) with 1 ppm accuracy by means of pulsed laser spectroscopy to determine the two-photon-exchange contribution with $2\times10^{-4}$ relative accuracy. In the proposed experiment, the $渭$p atom undergoes a laser excitation from the singlet hyperfine state to the triplet hyperfine state, {then} is quenched back to the singlet state by an inelastic collision with a H$_2$ molecule. The resulting increase of kinetic energy after the collisional deexcitation is used as a signature of a successful laser transition between hyperfine states. In this paper, we calculate the combined probability that a $渭$p atom initially in the singlet hyperfine state undergoes a laser excitation to the triplet state followed by a collisional-induced deexcitation back to the singlet state. This combined probability has been computed using the optical Bloch equations including the inelastic and elastic collisions. Omitting the decoherence effects caused by {the laser bandwidth and }collisions would overestimate the transition probability by more than a factor of two in the experimental conditions. Moreover, we also account for Doppler effects and provide the matrix element, the saturation fluence, the elastic and inelastic collision rates for the singlet and triplet states, and the resonance linewidth. This calculation thus quantifies one of the key unknowns of the HFS experiment, leading to a precise definition of the requirements for the laser system and to an optimization of the hydrogen gas target where $渭$p is formed and the laser spectroscopy will occur. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.00138v3-abstract-full').style.display = 'none'; document.getElementById('2112.00138v3-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> 7 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">21 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> SciPost Phys. 13, 020 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2105.06701">arXiv:2105.06701</a> <span> [<a href="https://arxiv.org/pdf/2105.06701">pdf</a>, <a href="https://arxiv.org/format/2105.06701">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/10.1016/j.physleta.2021.127401">10.1016/j.physleta.2021.127401 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the muon transfer rate from muonic hydrogen to oxygen in the range 70-336 K </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Pizzolotto%2C+C">C. Pizzolotto</a>, <a href="/search/physics?searchtype=author&query=Sbrizzi%2C+A">A. Sbrizzi</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Baruzzo%2C+M">M. Baruzzo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Cabrera%2C+H">H. Cabrera</a>, <a href="/search/physics?searchtype=author&query=Cirrincione%2C+D">D. Cirrincione</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Vecchio%2C+C">C. De Vecchio</a>, <a href="/search/physics?searchtype=author&query=De+Vincenzi%2C+M">M. De Vincenzi</a>, <a href="/search/physics?searchtype=author&query=Fasci%2C+E">E. Fasci</a>, <a href="/search/physics?searchtype=author&query=Fuschino%2C+F">F. Fuschino</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Gianfrani%2C+L">L. Gianfrani</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/physics?searchtype=author&query=Labanti%2C+C">C. Labanti</a>, <a href="/search/physics?searchtype=author&query=Maggi%2C+V">V. Maggi</a> , et al. (17 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="2105.06701v1-abstract-short" style="display: inline;"> The first measurement of the temperature dependence of the muon transfer rate from muonic hydrogen to oxygen was performed by the FAMU collaboration in 2016. The results provide evidence that the transfer rate rises with the temperature in the range 104-300 K. This paper presents the results of the experiment done in 2018 to extend the measurements towards lower (70 K) and higher (336 K) temperatu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.06701v1-abstract-full').style.display = 'inline'; document.getElementById('2105.06701v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2105.06701v1-abstract-full" style="display: none;"> The first measurement of the temperature dependence of the muon transfer rate from muonic hydrogen to oxygen was performed by the FAMU collaboration in 2016. The results provide evidence that the transfer rate rises with the temperature in the range 104-300 K. This paper presents the results of the experiment done in 2018 to extend the measurements towards lower (70 K) and higher (336 K) temperatures. The 2018 results confirm the temperature dependence of the muon transfer rate observed in 2016 and sets firm ground for comparison with the theoretical predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.06701v1-abstract-full').style.display = 'none'; document.getElementById('2105.06701v1-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 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.02049">arXiv:1905.02049</a> <span> [<a href="https://arxiv.org/pdf/1905.02049">pdf</a>, <a href="https://arxiv.org/ps/1905.02049">ps</a>, <a href="https://arxiv.org/format/1905.02049">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/10.1016/j.physleta.2020.126667">10.1016/j.physleta.2020.126667 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First measurement of the temperature dependence of muon transfer rate from muonic hydrogen atoms to oxygen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=FAMU+Collaboration"> FAMU Collaboration</a>, <a href="/search/physics?searchtype=author&query=Mocchiutti%2C+E">E. Mocchiutti</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">V. Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Morales%2C+H+C">H. Cabrera Morales</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">F. Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Vecchi%2C+C">C. De Vecchi</a>, <a href="/search/physics?searchtype=author&query=De+Vincenzi%2C+M">M. De Vincenzi</a>, <a href="/search/physics?searchtype=author&query=Furlanetto%2C+E">E. Furlanetto</a>, <a href="/search/physics?searchtype=author&query=Fuschino%2C+F">F. Fuschino</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Guffanti%2C+D">D. Guffanti</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/physics?searchtype=author&query=Labanti%2C+C">C. Labanti</a>, <a href="/search/physics?searchtype=author&query=Maggi%2C+V">V. Maggi</a> , et al. (17 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="1905.02049v3-abstract-short" style="display: inline;"> We report the first measurement of the temperature dependence of muon transfer rate from $渭$p atoms to oxygen between 100 and 300 K. Data were obtained from the X-ray spectra of delayed events in gaseous target H$_2$/O$_2$ exposed to a muon beam. Based on the data, we determined the muon transfer energy dependence up to 0.1 eV, showing an 8-fold increase in contrast with the predictions of constan… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.02049v3-abstract-full').style.display = 'inline'; document.getElementById('1905.02049v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.02049v3-abstract-full" style="display: none;"> We report the first measurement of the temperature dependence of muon transfer rate from $渭$p atoms to oxygen between 100 and 300 K. Data were obtained from the X-ray spectra of delayed events in gaseous target H$_2$/O$_2$ exposed to a muon beam. Based on the data, we determined the muon transfer energy dependence up to 0.1 eV, showing an 8-fold increase in contrast with the predictions of constant rate in the low energy limit. This work set constraints on theoretical models of muon transfer, and is of fundamental importance for the measurement of the hyperfine splitting of $渭$p by the FAMU collaboration. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.02049v3-abstract-full').style.display = 'none'; document.getElementById('1905.02049v3-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 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">11 pages, 4 figure</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. A, 384/26 (2020) 126667 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1808.07240">arXiv:1808.07240</a> <span> [<a href="https://arxiv.org/pdf/1808.07240">pdf</a>, <a href="https://arxiv.org/format/1808.07240">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/10.1088/1742-6596/1138/1/012010">10.1088/1742-6596/1138/1/012010 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The next generation of laser spectroscopy experiments using light muonic atoms </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Schmidt%2C+S">S. Schmidt</a>, <a href="/search/physics?searchtype=author&query=Willig%2C+M">M. Willig</a>, <a href="/search/physics?searchtype=author&query=Haack%2C+J">J. Haack</a>, <a href="/search/physics?searchtype=author&query=Horn%2C+R">R. Horn</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Ahmed%2C+M+A">M. Abdou Ahmed</a>, <a href="/search/physics?searchtype=author&query=Amaro%2C+F+D">F. D. Amaro</a>, <a href="/search/physics?searchtype=author&query=Amaro%2C+P">P. Amaro</a>, <a href="/search/physics?searchtype=author&query=Biraben%2C+F">F. Biraben</a>, <a href="/search/physics?searchtype=author&query=Carvalho%2C+P">P. Carvalho</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+T+-">T. -L. Chen</a>, <a href="/search/physics?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a>, <a href="/search/physics?searchtype=author&query=Graf%2C+T">T. Graf</a>, <a href="/search/physics?searchtype=author&query=Guerra%2C+M">M. Guerra</a>, <a href="/search/physics?searchtype=author&query=H%C3%A4nsch%2C+T+W">T. W. H盲nsch</a>, <a href="/search/physics?searchtype=author&query=Hildebrandt%2C+M">M. Hildebrandt</a>, <a href="/search/physics?searchtype=author&query=Huang%2C+Y+-">Y. -C. Huang</a>, <a href="/search/physics?searchtype=author&query=Indelicato%2C+P">P. Indelicato</a>, <a href="/search/physics?searchtype=author&query=Julien%2C+L">L. Julien</a>, <a href="/search/physics?searchtype=author&query=Kirch%2C+K">K. Kirch</a>, <a href="/search/physics?searchtype=author&query=Knecht%2C+A">A. Knecht</a>, <a href="/search/physics?searchtype=author&query=Kottmann%2C+F">F. Kottmann</a>, <a href="/search/physics?searchtype=author&query=Krauth%2C+J+J">J. J. Krauth</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+Y+-">Y. -W. Liu</a>, <a href="/search/physics?searchtype=author&query=Machado%2C+J">J. Machado</a> , et al. (19 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="1808.07240v1-abstract-short" style="display: inline;"> Precision spectroscopy of light muonic atoms provides unique information about the atomic and nuclear structure of these systems and thus represents a way to access fundamental interactions, properties and constants. One application comprises the determination of absolute nuclear charge radii with unprecedented accuracy from measurements of the 2S$\,$-$\,$2P Lamb shift. Here, we review recent resu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.07240v1-abstract-full').style.display = 'inline'; document.getElementById('1808.07240v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1808.07240v1-abstract-full" style="display: none;"> Precision spectroscopy of light muonic atoms provides unique information about the atomic and nuclear structure of these systems and thus represents a way to access fundamental interactions, properties and constants. One application comprises the determination of absolute nuclear charge radii with unprecedented accuracy from measurements of the 2S$\,$-$\,$2P Lamb shift. Here, we review recent results of nuclear charge radii extracted from muonic hydrogen and helium spectroscopy and present experiment proposals to access light muonic atoms with $Z \geq 3$. In addition, our approaches towards a precise measurement of the Zemach radii in muonic hydrogen ($渭$p) and helium ($渭$$^{3}$He$^{+}$) are discussed. These results will provide new tests of bound-state quantum-electrodynamics in hydrogen-like systems and can be used as benchmarks for nuclear structure theories. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.07240v1-abstract-full').style.display = 'none'; document.getElementById('1808.07240v1-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> 22 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2018. </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">17 pages, 8 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/1808.06380">arXiv:1808.06380</a> <span> [<a href="https://arxiv.org/pdf/1808.06380">pdf</a>, <a href="https://arxiv.org/ps/1808.06380">ps</a>, <a href="https://arxiv.org/format/1808.06380">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="Data Analysis, Statistics and Probability">physics.data-an</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/10.1088/1742-6596/1138/1/012017">10.1088/1742-6596/1138/1/012017 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> FAMU: study of the energy dependent transfer rate $螞_{渭p \rightarrow 渭O}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=FAMU+Collaboration"> FAMU Collaboration</a>, <a href="/search/physics?searchtype=author&query=Mocchiutti%2C+E">E. Mocchiutti</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">V. Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Furlanetto%2C+E">E. Furlanetto</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Guffanti%2C+D">D. Guffanti</a>, <a href="/search/physics?searchtype=author&query=Pizzolotto%2C+C">C. Pizzolotto</a>, <a href="/search/physics?searchtype=author&query=Rachevski%2C+A">A. Rachevski</a>, <a href="/search/physics?searchtype=author&query=Stoychev%2C+L">L. Stoychev</a>, <a href="/search/physics?searchtype=author&query=Vallazza%2C+E">E. Vallazza</a>, <a href="/search/physics?searchtype=author&query=Zampa%2C+G">G. Zampa</a>, <a href="/search/physics?searchtype=author&query=Niemela%2C+J">J. Niemela</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Baccolo%2C+G">G. Baccolo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">F. Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Curioni%2C+A">A. Curioni</a>, <a href="/search/physics?searchtype=author&query=Maggi%2C+V">V. Maggi</a>, <a href="/search/physics?searchtype=author&query=Mazza%2C+R">R. Mazza</a>, <a href="/search/physics?searchtype=author&query=Moretti%2C+M">M. Moretti</a> , et al. (31 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="1808.06380v2-abstract-short" style="display: inline;"> The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen $螖E_{hfs}(渭^-p)1S$. The physical process behind this experiment is the following: $渭p$ are formed in a mixture of hydrogen and a higher-Z gas. When absorbing a photon at resonance-energy $螖E_{hfs}\approx0.182$~eV, in subsequent collisions with the surrounding $H_2$ molecules,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.06380v2-abstract-full').style.display = 'inline'; document.getElementById('1808.06380v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1808.06380v2-abstract-full" style="display: none;"> The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen $螖E_{hfs}(渭^-p)1S$. The physical process behind this experiment is the following: $渭p$ are formed in a mixture of hydrogen and a higher-Z gas. When absorbing a photon at resonance-energy $螖E_{hfs}\approx0.182$~eV, in subsequent collisions with the surrounding $H_2$ molecules, the $渭p$ is quickly de-excited and accelerated by $\sim2/3$ of the excitation energy. The observable is the time distribution of the K-lines X-rays emitted from the $渭Z$ formed by muon transfer $(渭p) +Z \rightarrow (渭Z)^*+p$, a reaction whose rate depends on the $渭p$ kinetic energy. The maximal response, to the tuned laser wavelength, of the time distribution of X-ray from K-lines of the $(渭Z)^*$ cascade indicate the resonance. During the preparatory phase of the FAMU experiment, several measurements have been performed both to validate the methodology and to prepare the best configuration of target and detectors for the spectroscopic measurement. We present here the crucial study of the energy dependence of the transfer rate from muonic hydrogen to oxygen ($螞_{渭p \rightarrow 渭O}$), precisely measured for the first time. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.06380v2-abstract-full').style.display = 'none'; document.getElementById('1808.06380v2-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> 22 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2018. </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, 4 figures, published on Journal of Physics: Conference Series, proc. of International Conference on Precision Physics of Simple Atomic Systems - PSAS2018. arXiv admin note: text overlap with arXiv:1708.03172</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Conf. Ser. 1138 012017 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1803.00964">arXiv:1803.00964</a> <span> [<a href="https://arxiv.org/pdf/1803.00964">pdf</a>, <a href="https://arxiv.org/ps/1803.00964">ps</a>, <a href="https://arxiv.org/format/1803.00964">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/10.1088/1361-6455/ab0bc7">10.1088/1361-6455/ab0bc7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> An influence of the spectator-nuclear motion on nonresonant formation of the muonic hydrogen molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M+P">Mark P. Faifman</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="1803.00964v3-abstract-short" style="display: inline;"> A model for description of nonresonant formation of the muonic molecules in collisions of the muonic hydrogen atoms with the hydrogenic molecules has been developed with taking into account the internal motion of all nuclei. It has been shown that such a motion leads to a significant smearing of the calculated energy-dependent formation rates at low collision energies. In particular, this effect i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.00964v3-abstract-full').style.display = 'inline'; document.getElementById('1803.00964v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1803.00964v3-abstract-full" style="display: none;"> A model for description of nonresonant formation of the muonic molecules in collisions of the muonic hydrogen atoms with the hydrogenic molecules has been developed with taking into account the internal motion of all nuclei. It has been shown that such a motion leads to a significant smearing of the calculated energy-dependent formation rates at low collision energies. In particular, this effect is strong in the $dd渭$ and $dt渭$ formation. An appreciable isotopic effect in the case of nonresonant $dd渭$ formation in $d渭$ collisions with the molecules D$_2$ and HD has been found. All these effects are of importance for many experimental researches in low-energy muon physics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.00964v3-abstract-full').style.display = 'none'; document.getElementById('1803.00964v3-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, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 March, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2018. </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">22 pages, 13 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/1711.07750">arXiv:1711.07750</a> <span> [<a href="https://arxiv.org/pdf/1711.07750">pdf</a>, <a href="https://arxiv.org/ps/1711.07750">ps</a>, <a href="https://arxiv.org/format/1711.07750">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/10.1140/epjd/e2017-80726-0">10.1140/epjd/e2017-80726-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Muonic-atom scattering from hydrogenic liquids in an incoherent approach </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</a>, <a href="/search/physics?searchtype=author&query=G%C3%B3rski%2C+A+Z">Andrzej Z. G贸rski</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="1711.07750v2-abstract-short" style="display: inline;"> The differential cross sections for low-energy muonic hydrogen atom scattering in liquid hydrogenic targets have been calculated in the incoherent approximation using the Van Hove response function. A simple model of liquids and the available experimental parameters have been employed for a description of the diffusive and vibrational modes in these targets. At collision energies below about 10 me… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.07750v2-abstract-full').style.display = 'inline'; document.getElementById('1711.07750v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.07750v2-abstract-full" style="display: none;"> The differential cross sections for low-energy muonic hydrogen atom scattering in liquid hydrogenic targets have been calculated in the incoherent approximation using the Van Hove response function. A simple model of liquids and the available experimental parameters have been employed for a description of the diffusive and vibrational modes in these targets. At collision energies below about 10 meV, the obtained cross sections are very different from the analogous cross sections for scattering in hydrogenic gases. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.07750v2-abstract-full').style.display = 'none'; document.getElementById('1711.07750v2-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 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">15 pages, 17 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. D 72, 40 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1708.03172">arXiv:1708.03172</a> <span> [<a href="https://arxiv.org/pdf/1708.03172">pdf</a>, <a href="https://arxiv.org/ps/1708.03172">ps</a>, <a href="https://arxiv.org/format/1708.03172">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="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> First FAMU observation of muon transfer from mu-p atoms to higher-Z elements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=FAMU+Collaboration"> FAMU Collaboration</a>, <a href="/search/physics?searchtype=author&query=Mocchiutti%2C+E">Emiliano Mocchiutti</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">Valter Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Carbone%2C+R">Rita Carbone</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">Miltcho Danailov</a>, <a href="/search/physics?searchtype=author&query=Furlanetto%2C+E">Elena Furlanetto</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">Komlan Segbeya Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Guffanti%2C+D">Daniele Guffanti</a>, <a href="/search/physics?searchtype=author&query=Pizzolotto%2C+C">Cecilia Pizzolotto</a>, <a href="/search/physics?searchtype=author&query=Rachevski%2C+A">Alexandre Rachevski</a>, <a href="/search/physics?searchtype=author&query=Stoychev%2C+L">Lyubomir Stoychev</a>, <a href="/search/physics?searchtype=author&query=Vallazza%2C+E+S">Erik Silvio Vallazza</a>, <a href="/search/physics?searchtype=author&query=Zampa%2C+G">Gianluigi Zampa</a>, <a href="/search/physics?searchtype=author&query=Niemela%2C+J">Joseph Niemela</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">Katsuhiko Ishida</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</a>, <a href="/search/physics?searchtype=author&query=Baccolo%2C+G">Giovanni Baccolo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">Roberto Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">Roberto Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">Maurizio Bonesini</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">Francesco Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">Massimiliano Clemenza</a>, <a href="/search/physics?searchtype=author&query=Curioni%2C+A">Alessandro Curioni</a>, <a href="/search/physics?searchtype=author&query=Maggi%2C+V">Valter Maggi</a>, <a href="/search/physics?searchtype=author&query=Mazza%2C+R">Roberto Mazza</a> , et al. (32 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="1708.03172v3-abstract-short" style="display: inline;"> The FAMU experiment aims to accurately measure the hyperfine splitting of the ground state of the muonic hydrogen atom. A measurement of the transfer rate of muons from hydrogen to heavier gases is necessary for this purpose. In June 2014, within a preliminary experiment, a pressurized gas-target was exposed to the pulsed low-energy muon beam at the RIKEN RAL muon facility (Rutherford Appleton Lab… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.03172v3-abstract-full').style.display = 'inline'; document.getElementById('1708.03172v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1708.03172v3-abstract-full" style="display: none;"> The FAMU experiment aims to accurately measure the hyperfine splitting of the ground state of the muonic hydrogen atom. A measurement of the transfer rate of muons from hydrogen to heavier gases is necessary for this purpose. In June 2014, within a preliminary experiment, a pressurized gas-target was exposed to the pulsed low-energy muon beam at the RIKEN RAL muon facility (Rutherford Appleton Laboratory, UK). The main goal of the test was the characterization of both the noise induced by the pulsed beam and the X-ray detectors. The apparatus, to some extent rudimental, has served admirably to this task. Technical results have been published that prove the validity of the choices made and pave the way for the next steps. This paper presents the results of physical relevance of measurements of the muon transfer rate to carbon dioxide, oxygen, and argon from non-thermalized excited mu-p atoms. The analysis methodology and the approach to the systematics errors are useful for the subsequent study of the transfer rate as function of the kinetic energy of the mu-p currently under way. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.03172v3-abstract-full').style.display = 'none'; document.getElementById('1708.03172v3-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 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 August, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">15 pages, 3 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1604.01572">arXiv:1604.01572</a> <span> [<a href="https://arxiv.org/pdf/1604.01572">pdf</a>, <a href="https://arxiv.org/ps/1604.01572">ps</a>, <a href="https://arxiv.org/format/1604.01572">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/10.1088/1748-0221/11/05/P05007">10.1088/1748-0221/11/05/P05007 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Steps towards the hyperfine splitting measurement of the muonic hydrogen ground state: pulsed muon beam and detection system characterization </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Baccolo%2C+G">G. Baccolo</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">V. Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Campana%2C+R">R. Campana</a>, <a href="/search/physics?searchtype=author&query=Carbone%2C+R">R. Carbone</a>, <a href="/search/physics?searchtype=author&query=Cervi%2C+T">T. Cervi</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">F. Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Curioni%2C+A">A. Curioni</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=D%27Antone%2C+I">I. D'Antone</a>, <a href="/search/physics?searchtype=author&query=De%2C+A">A. De</a>, <a href="/search/physics?searchtype=author&query=De%2C+C">C. De</a>, <a href="/search/physics?searchtype=author&query=De%2C+M">M. De</a>, <a href="/search/physics?searchtype=author&query=Furini%2C+M">M. Furini</a>, <a href="/search/physics?searchtype=author&query=Fuschino%2C+F">F. Fuschino</a>, <a href="/search/physics?searchtype=author&query=Gadejisso-Tossou%2C+K">K. Gadejisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Guffanti%2C+D">D. Guffanti</a>, <a href="/search/physics?searchtype=author&query=Iaciofano%2C+A">A. Iaciofano</a> , et al. (30 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="1604.01572v2-abstract-short" style="display: inline;"> The high precision measurement of the hyperfine splitting of the muonic-hydrogen atom ground state with pulsed and intense muon beam requires careful technological choices both in the construction of a gas target and of the detectors. In June 2014, the pressurized gas target of the FAMU experiment was exposed to the low energy pulsed muon beam at the RIKEN RAL muon facility. The objectives of the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.01572v2-abstract-full').style.display = 'inline'; document.getElementById('1604.01572v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1604.01572v2-abstract-full" style="display: none;"> The high precision measurement of the hyperfine splitting of the muonic-hydrogen atom ground state with pulsed and intense muon beam requires careful technological choices both in the construction of a gas target and of the detectors. In June 2014, the pressurized gas target of the FAMU experiment was exposed to the low energy pulsed muon beam at the RIKEN RAL muon facility. The objectives of the test were the characterization of the target, the hodoscope and the X-ray detectors. The apparatus consisted of a beam hodoscope and X-rays detectors made with high purity Germanium and Lanthanum Bromide crystals. In this paper the experimental setup is described and the results of the detector characterization are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.01572v2-abstract-full').style.display = 'none'; document.getElementById('1604.01572v2-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 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 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">22 pages, 14 figures, published and open access on JINST</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Instrumentation 11/05, P05007, 2016 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1511.05005">arXiv:1511.05005</a> <span> [<a href="https://arxiv.org/pdf/1511.05005">pdf</a>, <a href="https://arxiv.org/ps/1511.05005">ps</a>, <a href="https://arxiv.org/format/1511.05005">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/10.1088/1748-0221/11/03/P03019">10.1088/1748-0221/11/03/P03019 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Low-energy negative muon interaction with matter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Danev%2C+P">Petar Danev</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">Dimitar Bakalov</a>, <a href="/search/physics?searchtype=author&query=Mocchiutti%2C+E">Emiliano Mocchiutti</a>, <a href="/search/physics?searchtype=author&query=Stoilov%2C+M">Mihail Stoilov</a>, <a href="/search/physics?searchtype=author&query=Vacchi%2C+A">Andrea Vacchi</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="1511.05005v3-abstract-short" style="display: inline;"> Using simulated data, obtained with the FLUKA code, we derive empirical regularities about the propagation and stopping of low-energy negative muons in hydrogen and selected solid materials. The results are intended to help the preliminary stages of the set-up design for experimental studies of muon capture and muonic atom spectroscopy. Provided are approximate expressions for the parameters of th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.05005v3-abstract-full').style.display = 'inline'; document.getElementById('1511.05005v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1511.05005v3-abstract-full" style="display: none;"> Using simulated data, obtained with the FLUKA code, we derive empirical regularities about the propagation and stopping of low-energy negative muons in hydrogen and selected solid materials. The results are intended to help the preliminary stages of the set-up design for experimental studies of muon capture and muonic atom spectroscopy. Provided are approximate expressions for the parameters of the the momentum, spatial and angular distribution of the propagating muons. In comparison with the available data on the stopping power and range of muons (with which they agree in the considered energy range) these results have the advantage to also describe the statistical spread of the muon characteristics of interest. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.05005v3-abstract-full').style.display = 'none'; document.getElementById('1511.05005v3-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 March, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 November, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">17 pages, 9 figures; Version accepted for publication in JINST</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Instrumentation, Volume 11, March 2016 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1411.3546">arXiv:1411.3546</a> <span> [<a href="https://arxiv.org/pdf/1411.3546">pdf</a>, <a href="https://arxiv.org/ps/1411.3546">ps</a>, <a href="https://arxiv.org/format/1411.3546">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/10.1103/PhysRevA.90.054501">10.1103/PhysRevA.90.054501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Shift and broadening of resonance lines of antiprotonic helium atoms in solid helium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">Dimitar Bakalov</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="1411.3546v1-abstract-short" style="display: inline;"> We have estimated the shift and broadening of the resonance lines in the spectrum of antiprotonic helium atoms $\bar{p}\mathrm{He}^{+}$ implanted in solid helium $^4$He. The application of the response function for crystalline helium has enabled determination of the contributions from the collective degrees of freedom to the shift and broadening. It occurs that the broadening due to the collective… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1411.3546v1-abstract-full').style.display = 'inline'; document.getElementById('1411.3546v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1411.3546v1-abstract-full" style="display: none;"> We have estimated the shift and broadening of the resonance lines in the spectrum of antiprotonic helium atoms $\bar{p}\mathrm{He}^{+}$ implanted in solid helium $^4$He. The application of the response function for crystalline helium has enabled determination of the contributions from the collective degrees of freedom to the shift and broadening. It occurs that the broadening due to the collective motion is negligible compared to the natural line width. The available pair-correlation functions for crystalline $^4$He have been applied for estimating the resonance-line shift due to collisions of $\bar{p}\mathrm{He}^{+}$ atom with the surrounding $^4$He atoms. The dependence of the line shift, which has been calculated in the quasistatic limit, on the solid-$^4$He density is nonlinear. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1411.3546v1-abstract-full').style.display = 'none'; document.getElementById('1411.3546v1-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, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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, 4 figures, 1 table</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review A 90, 054501 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1409.1127">arXiv:1409.1127</a> <span> [<a href="https://arxiv.org/pdf/1409.1127">pdf</a>, <a href="https://arxiv.org/ps/1409.1127">ps</a>, <a href="https://arxiv.org/format/1409.1127">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/10.1016/j.physleta.2014.11.025">10.1016/j.physleta.2014.11.025 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Theoretical and computational study of the energy dependence of the muon transfer rate from hydrogen to higher-Z gases </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">Dimitar Bakalov</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</a>, <a href="/search/physics?searchtype=author&query=Stoilov%2C+M">Mihail Stoilov</a>, <a href="/search/physics?searchtype=author&query=Vacchi%2C+A">Andrea Vacchi</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="1409.1127v2-abstract-short" style="display: inline;"> The recent PSI Lamb shift experiment and the controversy about proton size revived the interest in measuring the hyperfine splitting in muonic hydrogen as an alternative possibility for comparing ordinary and muonic hydrogen spectroscopy data on proton electromagnetic structure. This measurement critically depends on the energy dependence of the muon transfer rate to heavier gases in the epitherma… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.1127v2-abstract-full').style.display = 'inline'; document.getElementById('1409.1127v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1409.1127v2-abstract-full" style="display: none;"> The recent PSI Lamb shift experiment and the controversy about proton size revived the interest in measuring the hyperfine splitting in muonic hydrogen as an alternative possibility for comparing ordinary and muonic hydrogen spectroscopy data on proton electromagnetic structure. This measurement critically depends on the energy dependence of the muon transfer rate to heavier gases in the epithermal range. The available data provide only qualitative information, and the theoretical predictions have not been verified. We propose a new method by measurements of the transfer rate in thermalized target at different temperatures, estimate its accuracy and investigate the optimal experimental conditions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.1127v2-abstract-full').style.display = 'none'; document.getElementById('1409.1127v2-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, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 September, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2014. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1309.0665">arXiv:1309.0665</a> <span> [<a href="https://arxiv.org/pdf/1309.0665">pdf</a>, <a href="https://arxiv.org/ps/1309.0665">ps</a>, <a href="https://arxiv.org/format/1309.0665">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/10.1103/PhysRevA.88.042505">10.1103/PhysRevA.88.042505 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Shift and broadening of resonance lines of the antiprotonic helium atoms in liquid He-4 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">Dimitar Bakalov</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="1309.0665v2-abstract-short" style="display: inline;"> The shift and broadening of the resonance lines in spectrum of the antiprotonic helium atoms $\bar{p}\mathrm{He}^{+}$ located in fluid and superfluid $^4$He have been calculated. The contributions to the shift and broadening from collective degrees of freedom in liquid $^4$He have been estimated using the phenomenological response function. Effects due to the interaction of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1309.0665v2-abstract-full').style.display = 'inline'; document.getElementById('1309.0665v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1309.0665v2-abstract-full" style="display: none;"> The shift and broadening of the resonance lines in spectrum of the antiprotonic helium atoms $\bar{p}\mathrm{He}^{+}$ located in fluid and superfluid $^4$He have been calculated. The contributions to the shift and broadening from collective degrees of freedom in liquid $^4$He have been estimated using the phenomenological response function. Effects due to the interaction of $\bar{p}\mathrm{He}^{+}$ with a single $^4$He atom have been calculated in the quasistatic approximation using the experimental pair correlation function. It has been shown that an implanted $\bar{p}\mathrm{He}^{+}$ atom establishes a good probe of liquid helium properties, since this atom practically does not change the target structure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1309.0665v2-abstract-full').style.display = 'none'; document.getElementById('1309.0665v2-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> 26 November, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 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">12 pages, 4 figures, 2 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review A 88, 042505 (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1111.4565">arXiv:1111.4565</a> <span> [<a href="https://arxiv.org/pdf/1111.4565">pdf</a>, <a href="https://arxiv.org/ps/1111.4565">ps</a>, <a href="https://arxiv.org/format/1111.4565">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/s10751-012-0559-x">10.1007/s10751-012-0559-x <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Influence of epithermal muonic molecule formation on kinetics of the $渭$CF processes in deuterium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M+P">Mark P. Faifman</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="1111.4565v1-abstract-short" style="display: inline;"> The non-resonant formation of $dd渭$ molecules in the loosely bound state in collisions of non-thermalized $d渭$ atoms with deuterium molecules D$_2$ has been considered. The process of such a type is possible only for collision energies exceeded the ionization potential of D$_2$. The calculated rates of $dd渭$ formation in the above-threshold energy region are about one order of magnitude higher tha… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.4565v1-abstract-full').style.display = 'inline'; document.getElementById('1111.4565v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1111.4565v1-abstract-full" style="display: none;"> The non-resonant formation of $dd渭$ molecules in the loosely bound state in collisions of non-thermalized $d渭$ atoms with deuterium molecules D$_2$ has been considered. The process of such a type is possible only for collision energies exceeded the ionization potential of D$_2$. The calculated rates of $dd渭$ formation in the above-threshold energy region are about one order of magnitude higher than obtained earlier. The role of epithermal non-resonant $渭$-molecule formation for the kinetics of $渭$CF processes in D$_2$ gas was studied. It was shown that the non-resonant $dd渭$ formation by $d渭$ atoms accelerated during the cascade can be directly observed in the neutron time spectra at very short initial times. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.4565v1-abstract-full').style.display = 'none'; document.getElementById('1111.4565v1-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> 19 November, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2011. </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, 5 figures, Proceedings of the International Conference on Exotic Atoms and Related Topics EXA-2011, Vienna, Sep 5-9, 2011</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Hyperfine Interact. 209, 63 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0801.0138">arXiv:0801.0138</a> <span> [<a href="https://arxiv.org/pdf/0801.0138">pdf</a>, <a href="https://arxiv.org/ps/0801.0138">ps</a>, <a href="https://arxiv.org/format/0801.0138">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/10.1103/PhysRevA.76.052512">10.1103/PhysRevA.76.052512 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Differential cross sections for muonic atom scattering in solid hydrogenic targets </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</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="0801.0138v1-abstract-short" style="display: inline;"> The differential cross sections for low-energy muonic hydrogen atom scattering in solid molecular H$_2$, D$_2$ and T$_2$ targets under low pressure have been calculated for various temperatures. The polycrystalline fcc and hcp structure of the solid hydrogenic targets are considered. The Bragg and phonon scattering processes are described using the Debye model of a solid. The calculated cross se… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0801.0138v1-abstract-full').style.display = 'inline'; document.getElementById('0801.0138v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0801.0138v1-abstract-full" style="display: none;"> The differential cross sections for low-energy muonic hydrogen atom scattering in solid molecular H$_2$, D$_2$ and T$_2$ targets under low pressure have been calculated for various temperatures. The polycrystalline fcc and hcp structure of the solid hydrogenic targets are considered. The Bragg and phonon scattering processes are described using the Debye model of a solid. The calculated cross sections are used for Monte Carlo simulations of the muonic atom slowing down in these targets. They have been successfully applied for a description of the production of the muonic atom beams in the multilayer hydrogenic crystals. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0801.0138v1-abstract-full').style.display = 'none'; document.getElementById('0801.0138v1-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> 30 December, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2008. </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">23 pages, 19 figures, 2 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A76, 052512 (2007) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0711.4136">arXiv:0711.4136</a> <span> [<a href="https://arxiv.org/pdf/0711.4136">pdf</a>, <a href="https://arxiv.org/ps/0711.4136">ps</a>, <a href="https://arxiv.org/format/0711.4136">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/10.1140/epjd/e2008-00287-7">10.1140/epjd/e2008-00287-7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Monte Carlo simulations of muCF processes kinetics in deuterium gas </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</a>, <a href="/search/physics?searchtype=author&query=faifman%2C+M+P">Mark P. faifman</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="0711.4136v1-abstract-short" style="display: inline;"> The muon-catalyzed-fusion processes in D$_2$ gas for various temperatures and densities have been studied by means of Monte Carlo simulations. In particular, the role of the resonant and nonresonant $dd渭$ formation and differences between the neutron time spectra from the ortho-D$_2$ and para-D$_2$ targets at low temperatures have been investigated. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0711.4136v1-abstract-full" style="display: none;"> The muon-catalyzed-fusion processes in D$_2$ gas for various temperatures and densities have been studied by means of Monte Carlo simulations. In particular, the role of the resonant and nonresonant $dd渭$ formation and differences between the neutron time spectra from the ortho-D$_2$ and para-D$_2$ targets at low temperatures have been investigated. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0711.4136v1-abstract-full').style.display = 'none'; document.getElementById('0711.4136v1-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> 26 November, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2007. </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, 10 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. D 51, 341 (2009) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0609146">arXiv:physics/0609146</a> <span> [<a href="https://arxiv.org/pdf/physics/0609146">pdf</a>, <a href="https://arxiv.org/ps/physics/0609146">ps</a>, <a href="https://arxiv.org/format/physics/0609146">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/10.1140/epjd/e2006-00252-6">10.1140/epjd/e2006-00252-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Diffusion radius of muonic hydrogen atoms in H-D gas </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</a>, <a href="/search/physics?searchtype=author&query=Gronowski%2C+J">Jakub Gronowski</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="physics/0609146v1-abstract-short" style="display: inline;"> The diffusion radius of the 1S muonic hydrogen atoms in gaseous H_2 targets with various deuterium admixtures has been determined for temperatures T=30 and 300 K. The Monte Carlo calculations have been performed using the partial differential crosssections for $p渭$ and $d渭$ atom scattering from the molecules H$_2$, HD and D$_2$. These cross sections include hyperfine transitions in the muonic at… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0609146v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0609146v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0609146v1-abstract-full" style="display: none;"> The diffusion radius of the 1S muonic hydrogen atoms in gaseous H_2 targets with various deuterium admixtures has been determined for temperatures T=30 and 300 K. The Monte Carlo calculations have been performed using the partial differential crosssections for $p渭$ and $d渭$ atom scattering from the molecules H$_2$, HD and D$_2$. These cross sections include hyperfine transitions in the muonic atoms, the muon exchange between the nuclei $p$ and $d$, and rotational-vibrational transitions in the target molecules. The Monte Carlo results have been used for preparing the time-projection chamber for the high-precision measurement of the nuclear $渭^{-}$ capture in the ground-state $p渭$ atom, which is now underway at the Paul Scherrer Institute. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0609146v1-abstract-full').style.display = 'none'; document.getElementById('physics/0609146v1-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 September, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2006. </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, 10 figures, 1 table</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. D 41, 493 (2007) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0608243">arXiv:physics/0608243</a> <span> [<a href="https://arxiv.org/pdf/physics/0608243">pdf</a>, <a href="https://arxiv.org/ps/physics/0608243">ps</a>, <a href="https://arxiv.org/format/physics/0608243">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/10.1103/PhysRevA.74.042718">10.1103/PhysRevA.74.042718 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Differential cross sections for muonic atom scattering from hydrogenic molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</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="physics/0608243v1-abstract-short" style="display: inline;"> The differential cross sections for low-energy muonic hydrogen atom scattering from hydrogenic molecules are directly expressed by the corresponding amplitudes for muonic atom scattering from hydrogen-isotope nuclei. The energy and angular dependence of these three-body amplitudes is thus taken naturally into account in scattering from molecules, without involving any pseudopotentials. Effects o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0608243v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0608243v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0608243v1-abstract-full" style="display: none;"> The differential cross sections for low-energy muonic hydrogen atom scattering from hydrogenic molecules are directly expressed by the corresponding amplitudes for muonic atom scattering from hydrogen-isotope nuclei. The energy and angular dependence of these three-body amplitudes is thus taken naturally into account in scattering from molecules, without involving any pseudopotentials. Effects of the internal motion of nuclei inside the target molecules are included for every initial rotational-vibrational state. These effects are very significant as the considered three-body amplitudes often vary strongly within the energy interval $\lesssim{}0.1$ eV. The differential cross sections, calculated using the presented method, have been successfully used for planning and interpreting many experiments in low-energy muon physics. Studies of $渭^{-}$ nuclear capture in $p渭$ and the measurement of the Lamb shift in $p渭$ atoms created in H$_2$ gaseous targets are recent examples. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0608243v1-abstract-full').style.display = 'none'; document.getElementById('physics/0608243v1-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 August, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2006. </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">21 pages, 13 figures, submitted to Phys. Rev. A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 74, 042718 (2006) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0412090">arXiv:physics/0412090</a> <span> [<a href="https://arxiv.org/pdf/physics/0412090">pdf</a>, <a href="https://arxiv.org/ps/physics/0412090">ps</a>, <a href="https://arxiv.org/format/physics/0412090">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/10.1103/PhysRevA.72.052501">10.1103/PhysRevA.72.052501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Resonant dt-mu formation in condensed hydrogens </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M">Mark Faifman</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="physics/0412090v2-abstract-short" style="display: inline;"> Resonant formation of the muonic molecule dt-mu in t-mu atom collision with condensed H/D/T targets is considered. A specific resonance correlation function, which is a generalization of the Van Hove single-particle correlation function, is introduced to calculate the resonant-formation rate in such targets. This function is derived in the case of a polycrystalline harmonic solid. Also is found… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0412090v2-abstract-full').style.display = 'inline'; document.getElementById('physics/0412090v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0412090v2-abstract-full" style="display: none;"> Resonant formation of the muonic molecule dt-mu in t-mu atom collision with condensed H/D/T targets is considered. A specific resonance correlation function, which is a generalization of the Van Hove single-particle correlation function, is introduced to calculate the resonant-formation rate in such targets. This function is derived in the case of a polycrystalline harmonic solid. Also is found a general asymptotic form of the resonance correlation function for high momentum transfers, valid for any solid or dense-fluid hydrogen-isotope target. Numerical calculations of the rates are performed for solid molecular hydrogens at zero pressure, using the Debye model of an isotropic solid. It is shown that condensed-matter effects in resonant formation are strong, which explains some unexpected experimental results. In particular, the resonance profiles are affected by large zero-point vibrations of the hydrogen-isotope molecules bound in the considered crystals, even for high (1 eV) collision energies. This is important for explanation of the time-of-flight measurements of the dt-mu-formation rate, carried out at TRIUMF. The calculated mean values of the dt-mu-formation rate in solid D/T targets, for fixed target temperatures and steady-state conditions, are in good agreement with the PSI and RIKEN-RAL experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0412090v2-abstract-full').style.display = 'none'; document.getElementById('physics/0412090v2-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> 22 March, 2005; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 December, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2004. </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">31 pages, 16 figures, minor text changes, reduced number of equations</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 72, 052501 (2005) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/nucl-ex/0111019">arXiv:nucl-ex/0111019</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/0111019">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/0111019">ps</a>, <a href="https://arxiv.org/format/nucl-ex/0111019">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> <p class="title is-5 mathjax"> Resonant Scattering of Muonic Hydrogen Atoms and Dynamics of Muonic Molecular Complex </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=TRIUMF+Munoic+Hydrogen+Collaboration"> TRIUMF Munoic Hydrogen Collaboration</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bailey%2C+J+M">J. M. Bailey</a>, <a href="/search/physics?searchtype=author&query=Beer%2C+G+A">G. A. Beer</a>, <a href="/search/physics?searchtype=author&query=Beveridge%2C+J+L">J. L. Beveridge</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M+P">M. P. Faifman</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+T+M">T. M. Huber</a>, <a href="/search/physics?searchtype=author&query=Kammel%2C+P">P. Kammel</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+S+K">S. K. Kim</a>, <a href="/search/physics?searchtype=author&query=Knowles%2C+P+E">P. E. Knowles</a>, <a href="/search/physics?searchtype=author&query=Kunselman%2C+A+R">A. R. Kunselman</a>, <a href="/search/physics?searchtype=author&query=Maier%2C+M">M. Maier</a>, <a href="/search/physics?searchtype=author&query=Markushin%2C+V+E">V. E. Markushin</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+G+M">G. M. Marshall</a>, <a href="/search/physics?searchtype=author&query=Martoff%2C+C+J">C. J. Martoff</a>, <a href="/search/physics?searchtype=author&query=Mason%2C+G+R">G. R. Mason</a>, <a href="/search/physics?searchtype=author&query=Mulhauser%2C+F">F. Mulhauser</a>, <a href="/search/physics?searchtype=author&query=Olin%2C+A">A. Olin</a>, <a href="/search/physics?searchtype=author&query=Petitjean%2C+C">C. Petitjean</a>, <a href="/search/physics?searchtype=author&query=Porcelli%2C+T+A">T. A. Porcelli</a>, <a href="/search/physics?searchtype=author&query=Wozniak%2C+J">J. Wozniak</a>, <a href="/search/physics?searchtype=author&query=Zmeskal%2C+J">J. Zmeskal</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="nucl-ex/0111019v1-abstract-short" style="display: inline;"> Resonant scattering of muonic hydrogen atoms via back decay of molecular complex, a key process in the understanding of epithermal muonic molecular formation, is analyzed. The limitations of the effective rate approximation are discussed and the importance of the explicit treatment of the back decay is stressed. An expression of the energy distribution for the back-decayed atoms is given. </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/0111019v1-abstract-full" style="display: none;"> Resonant scattering of muonic hydrogen atoms via back decay of molecular complex, a key process in the understanding of epithermal muonic molecular formation, is analyzed. The limitations of the effective rate approximation are discussed and the importance of the explicit treatment of the back decay is stressed. An expression of the energy distribution for the back-decayed atoms is given. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0111019v1-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/0111019v1-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 November, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2001. </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">5pages, contribution to RIKEN International Symposium on Muon Catalyzed Fusion, to be published in Hyperfine Interactions</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-01-36 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0104010">arXiv:physics/0104010</a> <span> [<a href="https://arxiv.org/pdf/physics/0104010">pdf</a>, <a href="https://arxiv.org/ps/physics/0104010">ps</a>, <a href="https://arxiv.org/format/physics/0104010">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Physics">physics.gen-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/PhysRevLett.86.3763">10.1103/PhysRevLett.86.3763 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the Resonant $d渭t$ Molecular Formation Rate in Solid HD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Porcelli%2C+T+A">T. A. Porcelli</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bailey%2C+J+M">J. M. Bailey</a>, <a href="/search/physics?searchtype=author&query=Beer%2C+G+A">G. A. Beer</a>, <a href="/search/physics?searchtype=author&query=Douglas%2C+J+L">J. L. Douglas</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M+P">M. P. Faifman</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+T+M">T. M. Huber</a>, <a href="/search/physics?searchtype=author&query=Kammel%2C+P">P. Kammel</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+S+K">S. K. Kim</a>, <a href="/search/physics?searchtype=author&query=Knowles%2C+P+E">P. E. Knowles</a>, <a href="/search/physics?searchtype=author&query=Kunselman%2C+A+R">A. R. Kunselman</a>, <a href="/search/physics?searchtype=author&query=Maier%2C+M">M. Maier</a>, <a href="/search/physics?searchtype=author&query=kushin%2C+V+E+M">V. E. Mar kushin</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+G+M">G. M. Marshall</a>, <a href="/search/physics?searchtype=author&query=Mason%2C+G+R">G. R. Mason</a>, <a href="/search/physics?searchtype=author&query=Mulhauser%2C+F">F. Mulhauser</a>, <a href="/search/physics?searchtype=author&query=Olin%2C+A">A. Olin</a>, <a href="/search/physics?searchtype=author&query=Petitjean%2C+C">C. Petitjean</a>, <a href="/search/physics?searchtype=author&query=Zmeskal%2C+J">J. Zmeskal</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="physics/0104010v1-abstract-short" style="display: inline;"> Measurements of muon-catalyzed dt fusion ($d渭t \to ^4He+n+渭^-$) in solid HD have been performed. The theory describing the energy dependent resonant molecular formation rate for the reaction $渭t$ + HD $\to [(d渭t)pee]^*$ is compared to experimental results in a pure solid HD target. Constraints on the rates are inferred through the use of a Monte Carlo model developed specifically for the experim… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0104010v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0104010v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0104010v1-abstract-full" style="display: none;"> Measurements of muon-catalyzed dt fusion ($d渭t \to ^4He+n+渭^-$) in solid HD have been performed. The theory describing the energy dependent resonant molecular formation rate for the reaction $渭t$ + HD $\to [(d渭t)pee]^*$ is compared to experimental results in a pure solid HD target. Constraints on the rates are inferred through the use of a Monte Carlo model developed specifically for the experiment. From the time-of- flight analysis of fusion events in 16 and 37 $渭g\cdot cm^{-2}$ targets, an average formation rate consistent with 0.897$\pm$(0.046)$_{stat}\pm$ (0.166)$_{syst}$ times the theoretical prediction was obtained. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0104010v1-abstract-full').style.display = 'none'; document.getElementById('physics/0104010v1-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, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2001. </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">4 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-01-01 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.86:3763-3766,2001 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0102080">arXiv:physics/0102080</a> <span> [<a href="https://arxiv.org/pdf/physics/0102080">pdf</a>, <a href="https://arxiv.org/ps/physics/0102080">ps</a>, <a href="https://arxiv.org/format/physics/0102080">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/10.1103/PhysRevA.64.052705">10.1103/PhysRevA.64.052705 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Resonant $dd渭$ Formation in Condensed Deuterium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M+P">M. P. Faifman</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="physics/0102080v1-abstract-short" style="display: inline;"> The rate of $dd渭$ muonic molecule resonant formation in $d渭$ atom collision with a condensed deuterium target is expressed in terms of a single-particle response function. In particular, $dd渭$ formation in solid deuterium at low pressures is considered. Numerical calculations of the rate in the case of fcc polycrystalline deuterium at 3 K have been performed using the isotropic Debye model of so… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0102080v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0102080v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0102080v1-abstract-full" style="display: none;"> The rate of $dd渭$ muonic molecule resonant formation in $d渭$ atom collision with a condensed deuterium target is expressed in terms of a single-particle response function. In particular, $dd渭$ formation in solid deuterium at low pressures is considered. Numerical calculations of the rate in the case of fcc polycrystalline deuterium at 3 K have been performed using the isotropic Debye model of solid. It is shown that the energy-dependent $dd渭$ formation rates in the solid differ strongly from those obtained for D$_2$ gaseous targets, even at high $d渭$ kinetic energies. Monte Carlo neutron spectra from $dd$ fusion in $dd渭$ molecules have been obtained for solid targets with different concentrations of ortho-D$_2$ and para-D$_2$. The neutron time spectra calculated for pure ortho-D$_2$ and para-D$_2$ targets are very similar. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0102080v1-abstract-full').style.display = 'none'; document.getElementById('physics/0102080v1-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 February, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2001. </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">submitted to PRA</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 64, 052705 (2001) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/nucl-ex/0101007">arXiv:nucl-ex/0101007</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/0101007">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/0101007">ps</a>, <a href="https://arxiv.org/format/nucl-ex/0101007">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="High Energy Physics - Experiment">hep-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"> Time-of-Flight Spectroscopy of Muonic Hydrogen Atoms and Molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=TRIUMF+Muonic+Hydrogen+Collaboration"> TRIUMF Muonic Hydrogen Collaboration</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bailey%2C+J+M">J. M. Bailey</a>, <a href="/search/physics?searchtype=author&query=Beer%2C+G+A">G. A. Beer</a>, <a href="/search/physics?searchtype=author&query=Beveridge%2C+J+L">J. L. Beveridge</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M+P">M. P. Faifman</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+T+M">T. M. Huber</a>, <a href="/search/physics?searchtype=author&query=Kammel%2C+P">P. Kammel</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+S+K">S. K. Kim</a>, <a href="/search/physics?searchtype=author&query=Knowles%2C+P+E">P. E. Knowles</a>, <a href="/search/physics?searchtype=author&query=Kunselman%2C+A+R">A. R. Kunselman</a>, <a href="/search/physics?searchtype=author&query=Markushin%2C+V+E">V. E. Markushin</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+G+M">G. M. Marshall</a>, <a href="/search/physics?searchtype=author&query=Mason%2C+G+R">G. R. Mason</a>, <a href="/search/physics?searchtype=author&query=Mulhauser%2C+F">F. Mulhauser</a>, <a href="/search/physics?searchtype=author&query=Olin%2C+A">A. Olin</a>, <a href="/search/physics?searchtype=author&query=Petitjean%2C+C">C. Petitjean</a>, <a href="/search/physics?searchtype=author&query=Porcelli%2C+T+A">T. A. Porcelli</a>, <a href="/search/physics?searchtype=author&query=Zmeskal%2C+J">J. Zmeskal</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="nucl-ex/0101007v1-abstract-short" style="display: inline;"> Studies of muonic hydrogen atoms and molecules have been performed traditionally in bulk targets of gas, liquid or solid. At TRIUMF, Canada's meson facility, we have developed a new type of target system using multilayer thin films of solid hydrogen, which provides a beam of muonic hydrogen atoms in vacuum. Using the time-of-flight of the muonic atoms, the energy-dependent information of muonic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0101007v1-abstract-full').style.display = 'inline'; document.getElementById('nucl-ex/0101007v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/0101007v1-abstract-full" style="display: none;"> Studies of muonic hydrogen atoms and molecules have been performed traditionally in bulk targets of gas, liquid or solid. At TRIUMF, Canada's meson facility, we have developed a new type of target system using multilayer thin films of solid hydrogen, which provides a beam of muonic hydrogen atoms in vacuum. Using the time-of-flight of the muonic atoms, the energy-dependent information of muonic reactions are obtained in direct manner. We discuss some unique measurements enabled by the new technique, with emphasis on processes relevant to muon catalyzed fusion. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0101007v1-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/0101007v1-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> 22 January, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2001. </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 Hydrogen Atom II --- Precise Physics with Simple Atomic Systems (Springer, Berlin)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-00-60 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0009005">arXiv:hep-ex/0009005</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0009005">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/0009005">ps</a>, <a href="https://arxiv.org/format/hep-ex/0009005">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 - 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"> Using Thin Film Targets for Muonic Atoms and Muon Catalyzed Fusion Studies </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=TRIUMF+Munoic+Hydrogen+Collaboration"> TRIUMF Munoic Hydrogen Collaboration</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bailey%2C+J+M">J. M. Bailey</a>, <a href="/search/physics?searchtype=author&query=Beer%2C+G+A">G. A. Beer</a>, <a href="/search/physics?searchtype=author&query=Beveridge%2C+J+L">J. L. Beveridge</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M+P">M. P. Faifman</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+T+M">T. M. Huber</a>, <a href="/search/physics?searchtype=author&query=Kammel%2C+P">P. Kammel</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+S+K">S. K. Kim</a>, <a href="/search/physics?searchtype=author&query=Knowles%2C+P+E">P. E. Knowles</a>, <a href="/search/physics?searchtype=author&query=Kunselman%2C+A+R">A. R. Kunselman</a>, <a href="/search/physics?searchtype=author&query=Markushin%2C+V+E">V. E. Markushin</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+G+M">G. M. Marshall</a>, <a href="/search/physics?searchtype=author&query=Martoff%2C+C+J">C. J. Martoff</a>, <a href="/search/physics?searchtype=author&query=Mason%2C+G+R">G. R. Mason</a>, <a href="/search/physics?searchtype=author&query=Mulhauser%2C+F">F. Mulhauser</a>, <a href="/search/physics?searchtype=author&query=Olin%2C+A">A. Olin</a>, <a href="/search/physics?searchtype=author&query=Petitjean%2C+C">C. Petitjean</a>, <a href="/search/physics?searchtype=author&query=Porcelli%2C+T+A">T. A. Porcelli</a>, <a href="/search/physics?searchtype=author&query=Zmeskal%2C+J">J. Zmeskal</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="hep-ex/0009005v1-abstract-short" style="display: inline;"> Studies of muonic atoms and muon catalyzed fusion have been conventionally done in a bulk target of gas, liquid or solid hydrogen isotopes. The use of thin film targets developed at TRIUMF have notable advantages in tackling some of the most important questions in the field, which could be further exploited at future high intensity muon sources. We review the technique of the thin film method wi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0009005v1-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/0009005v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0009005v1-abstract-full" style="display: none;"> Studies of muonic atoms and muon catalyzed fusion have been conventionally done in a bulk target of gas, liquid or solid hydrogen isotopes. The use of thin film targets developed at TRIUMF have notable advantages in tackling some of the most important questions in the field, which could be further exploited at future high intensity muon sources. We review the technique of the thin film method with emphasis on recent results and a future proposal. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0009005v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0009005v1-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 September, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2000. </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">Talk given at KEK International Workshop on High Intensity Muon Sources, HIMUS-99</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-00-51 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/nucl-ex/0008002">arXiv:nucl-ex/0008002</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/0008002">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/0008002">ps</a>, <a href="https://arxiv.org/format/nucl-ex/0008002">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="High Energy Physics - Experiment">hep-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/10.1103/PhysRevLett.85.1642">10.1103/PhysRevLett.85.1642 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Resonant Formation of $d渭t$ Molecules in Deuterium: An Atomic Beam Measurement of Muon Catalyzed dt Fusion </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=TRIUMF+Munoic+Hydrogen+Collaboration"> TRIUMF Munoic Hydrogen Collaboration</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bailey%2C+J+M">J. M. Bailey</a>, <a href="/search/physics?searchtype=author&query=Beer%2C+G+A">G. A. Beer</a>, <a href="/search/physics?searchtype=author&query=Beveridge%2C+J+L">J. L. Beveridge</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M+P">M. P. Faifman</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+T+M">T. M. Huber</a>, <a href="/search/physics?searchtype=author&query=Kammel%2C+P">P. Kammel</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+S+K">S. K. Kim</a>, <a href="/search/physics?searchtype=author&query=Knowles%2C+P+E">P. E. Knowles</a>, <a href="/search/physics?searchtype=author&query=Kunselman%2C+A+R">A. R. Kunselman</a>, <a href="/search/physics?searchtype=author&query=Maier%2C+M">M. Maier</a>, <a href="/search/physics?searchtype=author&query=Markushin%2C+V+E">V. E. Markushin</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+G+M">G. M. Marshall</a>, <a href="/search/physics?searchtype=author&query=Martoff%2C+C+J">C. J. Martoff</a>, <a href="/search/physics?searchtype=author&query=Mason%2C+G+R">G. R. Mason</a>, <a href="/search/physics?searchtype=author&query=Mulhauser%2C+F">F. Mulhauser</a>, <a href="/search/physics?searchtype=author&query=Olin%2C+A">A. Olin</a>, <a href="/search/physics?searchtype=author&query=Petitjean%2C+C">C. Petitjean</a>, <a href="/search/physics?searchtype=author&query=Porcelli%2C+T+A">T. A. Porcelli</a>, <a href="/search/physics?searchtype=author&query=Wozniak%2C+J">J. Wozniak</a>, <a href="/search/physics?searchtype=author&query=Zmeskal%2C+J">J. Zmeskal</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="nucl-ex/0008002v1-abstract-short" style="display: inline;"> Resonant formation of $d渭t$ molecules in collisions of muonic tritium ($渭t$) on D$_2$ was investigated using a beam of $渭t$ atoms, demonstrating a new direct approach in muon catalyzed fusion studies. Strong epithermal resonances in $d渭t$ formation were directly revealed for the first time. From the time-of-flight analysis of $2036\pm 116$ $dt$ fusion events, a formation rate consistent with… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0008002v1-abstract-full').style.display = 'inline'; document.getElementById('nucl-ex/0008002v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/0008002v1-abstract-full" style="display: none;"> Resonant formation of $d渭t$ molecules in collisions of muonic tritium ($渭t$) on D$_2$ was investigated using a beam of $渭t$ atoms, demonstrating a new direct approach in muon catalyzed fusion studies. Strong epithermal resonances in $d渭t$ formation were directly revealed for the first time. From the time-of-flight analysis of $2036\pm 116$ $dt$ fusion events, a formation rate consistent with $0.73\pm (0.16)_{meas} \pm (0.09)_{model}$ times the theoretical prediction was obtained. For the largest peak at a resonance energy of $0.423 \pm 0.037$ eV, this corresponds to a rate of $(7.1 \pm 1.8) \times 10^9$ s$^{-1}$, more than an order of magnitude larger than those at low energies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0008002v1-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/0008002v1-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 August, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2000. </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">To appear in Phys. Rev. Lett</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-00-24 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett. 85 (2000) 1642-1645 </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 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