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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/2407.05659">arXiv:2407.05659</a> <span> [<a href="https://arxiv.org/pdf/2407.05659">pdf</a>, <a href="https://arxiv.org/ps/2407.05659">ps</a>, <a href="https://arxiv.org/format/2407.05659">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.110.014310">10.1103/PhysRevC.110.014310 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Isochronous mass spectrometry at the RIKEN Rare-RI Ring facility </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Nagae%2C+D">D. Nagae</a>, <a href="/search/nucl-ex?searchtype=author&query=Omika%2C+S">S. Omika</a>, <a href="/search/nucl-ex?searchtype=author&query=Abe%2C+Y">Y. Abe</a>, <a href="/search/nucl-ex?searchtype=author&query=Yamaguchi%2C+Y">Y. Yamaguchi</a>, <a href="/search/nucl-ex?searchtype=author&query=Suzaki%2C+F">F. Suzaki</a>, <a href="/search/nucl-ex?searchtype=author&query=Wakayama%2C+K">K. Wakayama</a>, <a href="/search/nucl-ex?searchtype=author&query=Tadano%2C+N">N. Tadano</a>, <a href="/search/nucl-ex?searchtype=author&query=Igosawa%2C+R">R. Igosawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Inomata%2C+K">K. Inomata</a>, <a href="/search/nucl-ex?searchtype=author&query=Arakawa%2C+H">H. Arakawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Nishimuro%2C+K">K. Nishimuro</a>, <a href="/search/nucl-ex?searchtype=author&query=Fujii%2C+T">T. Fujii</a>, <a href="/search/nucl-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/nucl-ex?searchtype=author&query=Yamaguchi%2C+T">T. Yamaguchi</a>, <a href="/search/nucl-ex?searchtype=author&query=Suzuki%2C+T">T. Suzuki</a>, <a href="/search/nucl-ex?searchtype=author&query=Suzuki%2C+S">S. Suzuki</a>, <a href="/search/nucl-ex?searchtype=author&query=Moriguchi%2C+T">T. Moriguchi</a>, <a href="/search/nucl-ex?searchtype=author&query=Amano%2C+M">M. Amano</a>, <a href="/search/nucl-ex?searchtype=author&query=Kamioka%2C+D">D. Kamioka</a>, <a href="/search/nucl-ex?searchtype=author&query=Ozawa%2C+A">A. Ozawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Naimi%2C+S">S. Naimi</a>, <a href="/search/nucl-ex?searchtype=author&query=Ge%2C+Z">Z. Ge</a>, <a href="/search/nucl-ex?searchtype=author&query=Yanagisawa%2C+Y">Y. Yanagisawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Baba%2C+H">H. Baba</a>, <a href="/search/nucl-ex?searchtype=author&query=Michimasa%2C+S">S. Michimasa</a> , et al. (6 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="2407.05659v1-abstract-short" style="display: inline;"> A dedicated isochronous storage ring, named the Rare-RI Ring, was constructed at the RI Beam Factory of RIKEN, aiming at precision mass measurements of nuclei located in uncharted territories of the nuclear chart. The Rare-RI Ring employs the isochronous mass spectrometry technique with the goal to achieve a relative mass precision of $10^{-6}$ within a measurement time of less than 1 ms. The perf… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.05659v1-abstract-full').style.display = 'inline'; document.getElementById('2407.05659v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.05659v1-abstract-full" style="display: none;"> A dedicated isochronous storage ring, named the Rare-RI Ring, was constructed at the RI Beam Factory of RIKEN, aiming at precision mass measurements of nuclei located in uncharted territories of the nuclear chart. The Rare-RI Ring employs the isochronous mass spectrometry technique with the goal to achieve a relative mass precision of $10^{-6}$ within a measurement time of less than 1 ms. The performance of the facility was demonstrated through mass measurements of neutron-rich nuclei with well-known masses. Velocity or magnetic rigidity is measured for every particle prior to its injection into the ring, wherein its revolution time is accurately determined. The latter quantity is used to determine the mass of the particle, while the former one is needed for non-isochronicity corrections. Mass precisions on the order of $10^{-5}$ were achieved in the first commissioning, which demonstrates that Rare-RI Ring is a powerful tool for mass spectrometry of short-lived nuclei. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.05659v1-abstract-full').style.display = 'none'; document.getElementById('2407.05659v1-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 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review C 110, 014310 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.11528">arXiv:2403.11528</a> <span> [<a href="https://arxiv.org/pdf/2403.11528">pdf</a>, <a href="https://arxiv.org/format/2403.11528">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Development of neutron beamline for laser-driven neutron resonance spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Lan%2C+Z">Zechen Lan</a>, <a href="/search/nucl-ex?searchtype=author&query=Arikawa%2C+Y">Yasunobu Arikawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Morace%2C+A">Alessio Morace</a>, <a href="/search/nucl-ex?searchtype=author&query=Abe%2C+Y">Yuki Abe</a>, <a href="/search/nucl-ex?searchtype=author&query=Mirfayzi%2C+S+R">S. Reza Mirfayzi</a>, <a href="/search/nucl-ex?searchtype=author&query=Wei%2C+T">Tianyun Wei</a>, <a href="/search/nucl-ex?searchtype=author&query=Hayakawa%2C+T">Takehito Hayakawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Yogo%2C+A">Akifumi Yogo</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="2403.11528v1-abstract-short" style="display: inline;"> Recent progress of laser science provides laser-driven neutron source (LDNS), which has remarkable features such as the short pulse width. One of the key techniques to be developed for more efficient use of the LDNS is neutron collimation tubes to increase the number of neutrons arriving at a detector in the time-of-flight method. However, when a tube with a thick wall is used as a collimator the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.11528v1-abstract-full').style.display = 'inline'; document.getElementById('2403.11528v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.11528v1-abstract-full" style="display: none;"> Recent progress of laser science provides laser-driven neutron source (LDNS), which has remarkable features such as the short pulse width. One of the key techniques to be developed for more efficient use of the LDNS is neutron collimation tubes to increase the number of neutrons arriving at a detector in the time-of-flight method. However, when a tube with a thick wall is used as a collimator the neutron collection efficiency at the detector increases but the time resolution becomes wider because of multiple scattering inside of the tube. In the present study, we have developed a collimation tube made of Ni-0, which is optimized for the increased neutron collection efficiency and a reasonable time resolution. This collimator has been demonstrated experimentally using neutron resonance spectroscopy with neutrons provided from LFEX laser. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.11528v1-abstract-full').style.display = 'none'; document.getElementById('2403.11528v1-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 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">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 6 figures, submitted to The European Physical Journal Plus</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.05312">arXiv:2112.05312</a> <span> [<a href="https://arxiv.org/pdf/2112.05312">pdf</a>, <a href="https://arxiv.org/format/2112.05312">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="Solar and Stellar Astrophysics">astro-ph.SR</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.128.152701">10.1103/PhysRevLett.128.152701 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First application of mass measurement with the Rare-RI Ring reveals the solar r-process abundance trend at A=122 and A=123 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Li%2C+H+F">H. F. Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Naimi%2C+S">S. Naimi</a>, <a href="/search/nucl-ex?searchtype=author&query=Sprouse%2C+T+M">T. M. Sprouse</a>, <a href="/search/nucl-ex?searchtype=author&query=Mumpower%2C+M+R">M. R. Mumpower</a>, <a href="/search/nucl-ex?searchtype=author&query=Abe%2C+Y">Y. Abe</a>, <a href="/search/nucl-ex?searchtype=author&query=Yamaguchi%2C+Y">Y. Yamaguchi</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagae%2C+D">D. Nagae</a>, <a href="/search/nucl-ex?searchtype=author&query=Suzaki%2C+F">F. Suzaki</a>, <a href="/search/nucl-ex?searchtype=author&query=Wakasugi%2C+M">M. Wakasugi</a>, <a href="/search/nucl-ex?searchtype=author&query=Arakawa%2C+H">H. Arakawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Dou%2C+W+B">W. B. Dou</a>, <a href="/search/nucl-ex?searchtype=author&query=Hamakawa%2C+D">D. Hamakawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Hosoi%2C+S">S. Hosoi</a>, <a href="/search/nucl-ex?searchtype=author&query=Inada%2C+Y">Y. Inada</a>, <a href="/search/nucl-ex?searchtype=author&query=Kajiki%2C+D">D. Kajiki</a>, <a href="/search/nucl-ex?searchtype=author&query=Kobayashi%2C+T">T. Kobayashi</a>, <a href="/search/nucl-ex?searchtype=author&query=Sakaue%2C+M">M. Sakaue</a>, <a href="/search/nucl-ex?searchtype=author&query=Yokoda%2C+Y">Y. Yokoda</a>, <a href="/search/nucl-ex?searchtype=author&query=Yamaguchi%2C+T">T. Yamaguchi</a>, <a href="/search/nucl-ex?searchtype=author&query=Kagesawa%2C+R">R. Kagesawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Kamioka%2C+D">D. Kamioka</a>, <a href="/search/nucl-ex?searchtype=author&query=Moriguchi%2C+T">T. Moriguchi</a>, <a href="/search/nucl-ex?searchtype=author&query=Mukai%2C+M">M. Mukai</a>, <a href="/search/nucl-ex?searchtype=author&query=Ozawa%2C+A">A. Ozawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Ota%2C+S">S. Ota</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="2112.05312v2-abstract-short" style="display: inline;"> The Rare-RI Ring (R3) is a recently commissioned cyclotron-like storage ring mass spectrometer dedicated to mass measurements of exotic nuclei far from stability at Radioactive Isotope Beam Factory (RIBF) in RIKEN. The first application of mass measurement using the R3 mass spectrometer at RIBF is reported. Rare isotopes produced at RIBF, $^{127}$Sn, $^{126}$In, $^{125}$Cd, $^{124}$Ag, $^{123}$Pd,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.05312v2-abstract-full').style.display = 'inline'; document.getElementById('2112.05312v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.05312v2-abstract-full" style="display: none;"> The Rare-RI Ring (R3) is a recently commissioned cyclotron-like storage ring mass spectrometer dedicated to mass measurements of exotic nuclei far from stability at Radioactive Isotope Beam Factory (RIBF) in RIKEN. The first application of mass measurement using the R3 mass spectrometer at RIBF is reported. Rare isotopes produced at RIBF, $^{127}$Sn, $^{126}$In, $^{125}$Cd, $^{124}$Ag, $^{123}$Pd, were injected in R3. Masses of $^{126}$In, $^{125}$Cd, and $^{123}$Pd were measured whereby the mass uncertainty of $^{123}$Pd was improved. This is the first reported measurement with a new storage ring mass spectrometery technique realized at a heavy-ion cyclotron and employing individual injection of the pre-identified rare nuclei. The latter is essential for the future mass measurements of the rarest isotopes produced at RIBF. The impact of the new $^{123}$Pd result on the solar $r$-process abundances in a neutron star merger event is investigated by performing reaction network calculations of 20 trajectories with varying electron fraction $Y_e$. It is found that the neutron capture cross section on $^{123}$Pd increases by a factor of 2.2 and $尾$-delayed neutron emission probability, $P_\mathrm{1n}$, of $^{123}$Rh increases by 14\%. The neutron capture cross section on $^{122}$Pd decreases by a factor of 2.6 leading to pileup of material at $A=122$, thus reproducing the trend of the solar $r$-process abundances. The trend of the two-neutron separation energies (S$_\mathrm{2n}$) was investigated for the Pd isotopic chain. The new mass measurement with improved uncertainty excludes large changes of the S$_\mathrm{2n}$ value at $N=77$. Such large increase of the S$_\mathrm{2n}$ values before $N=82$ was proposed as an alternative to the quenching of the $N=82$ shell gap to reproduce $r$-process abundances in the mass region of $A=112-124$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.05312v2-abstract-full').style.display = 'none'; document.getElementById('2112.05312v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.02479">arXiv:2011.02479</a> <span> [<a href="https://arxiv.org/pdf/2011.02479">pdf</a>, <a href="https://arxiv.org/format/2011.02479">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2020.164713">10.1016/j.nima.2020.164713 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Development and operation of an electrostatic time-of-flight detector for the Rare RI storage Ring </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Nagae%2C+D">D. Nagae</a>, <a href="/search/nucl-ex?searchtype=author&query=Abe%2C+Y">Y. Abe</a>, <a href="/search/nucl-ex?searchtype=author&query=Okada%2C+S">S. Okada</a>, <a href="/search/nucl-ex?searchtype=author&query=Omika%2C+S">S. Omika</a>, <a href="/search/nucl-ex?searchtype=author&query=Wakayama%2C+K">K. Wakayama</a>, <a href="/search/nucl-ex?searchtype=author&query=Hosoi%2C+S">S. Hosoi</a>, <a href="/search/nucl-ex?searchtype=author&query=Suzuki%2C+S">S. Suzuki</a>, <a href="/search/nucl-ex?searchtype=author&query=Moriguchi%2C+T">T. Moriguchi</a>, <a href="/search/nucl-ex?searchtype=author&query=Amano%2C+M">M. Amano</a>, <a href="/search/nucl-ex?searchtype=author&query=Kamioka%2C+D">D. Kamioka</a>, <a href="/search/nucl-ex?searchtype=author&query=Ge%2C+Z">Z. Ge</a>, <a href="/search/nucl-ex?searchtype=author&query=Naimi%2C+S">S. Naimi</a>, <a href="/search/nucl-ex?searchtype=author&query=Suzaki%2C+F">F. Suzaki</a>, <a href="/search/nucl-ex?searchtype=author&query=Tadano%2C+N">N. Tadano</a>, <a href="/search/nucl-ex?searchtype=author&query=Igosawa%2C+R">R. Igosawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Inomata%2C+K">K. Inomata</a>, <a href="/search/nucl-ex?searchtype=author&query=Arakawa%2C+H">H. Arakawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Nishimuro%2C+K">K. Nishimuro</a>, <a href="/search/nucl-ex?searchtype=author&query=Fujii%2C+T">T. Fujii</a>, <a href="/search/nucl-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/nucl-ex?searchtype=author&query=Yanagisawa%2C+Y">Y. Yanagisawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Baba%2C+H">H. Baba</a>, <a href="/search/nucl-ex?searchtype=author&query=Michimasa%2C+S">S. Michimasa</a>, <a href="/search/nucl-ex?searchtype=author&query=Ota%2C+S">S. Ota</a>, <a href="/search/nucl-ex?searchtype=author&query=Lorusso%2C+G">G. Lorusso</a> , et al. (6 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="2011.02479v1-abstract-short" style="display: inline;"> An electrostatic time-of-flight detector named E-MCP has been developed for quick diagnostics of circulating beam and timing measurement in mass spectrometry at the Rare-RI Ring in RIKEN. The E-MCP detector consists of a conversion foil, potential grids, and a microchannel plate. Secondary electrons are released from the surface of the foil when a heavy ion hits it. The electrons are accelerated a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.02479v1-abstract-full').style.display = 'inline'; document.getElementById('2011.02479v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.02479v1-abstract-full" style="display: none;"> An electrostatic time-of-flight detector named E-MCP has been developed for quick diagnostics of circulating beam and timing measurement in mass spectrometry at the Rare-RI Ring in RIKEN. The E-MCP detector consists of a conversion foil, potential grids, and a microchannel plate. Secondary electrons are released from the surface of the foil when a heavy ion hits it. The electrons are accelerated and deflected by 90$^\circ$ toward the microchannel plate by electrostatic potentials. A thin carbon foil and a thin aluminum-coated mylar foil were used as conversion foils. We obtained time resolutions of 69(1) ps and 43(1) ps (standard deviation) for a $^{84}$Kr beam at an energy of 170 MeV/u when using the carbon and the aluminum-coated mylar foils, respectively. A detection efficiency of approximately 90% was obtained for both foils. The E-MCP detector equipped with the carbon foil was installed inside the Rare-RI Ring to confirm particle circulation within a demonstration experiment on mass measurements of nuclei around $^{78}$Ge produced by in-flight fission of uranium beam at the RI Beam Factory in RIKEN. Periodic time signals from circulating ions were clearly observed. Revolution times for $^{78}$Ge, $^{77}$Ga, and $^{76}$Zn were obtained. The results confirmed successful circulation of the short-lived nuclei inside the Rare-RI Ring. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.02479v1-abstract-full').style.display = 'none'; document.getElementById('2011.02479v1-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 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Inst. and Methods in Physics Research, A 986 (2021) 164713 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1512.07562">arXiv:1512.07562</a> <span> [<a href="https://arxiv.org/pdf/1512.07562">pdf</a>, <a href="https://arxiv.org/ps/1512.07562">ps</a>, <a href="https://arxiv.org/format/1512.07562">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="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.93.054608">10.1103/PhysRevC.93.054608 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Muon capture on light isotopes in Double Chooz </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Double+Chooz+collaboration"> Double Chooz collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Abe%2C+Y">Y. Abe</a>, <a href="/search/nucl-ex?searchtype=author&query=Abrah%C3%A3o%2C+T">T. Abrah茫o</a>, <a href="/search/nucl-ex?searchtype=author&query=Almazan%2C+H">H. Almazan</a>, <a href="/search/nucl-ex?searchtype=author&query=Alt%2C+C">C. Alt</a>, <a href="/search/nucl-ex?searchtype=author&query=Appel%2C+S">S. Appel</a>, <a href="/search/nucl-ex?searchtype=author&query=Barriere%2C+J+C">J. C. Barriere</a>, <a href="/search/nucl-ex?searchtype=author&query=Baussan%2C+E">E. Baussan</a>, <a href="/search/nucl-ex?searchtype=author&query=Bekman%2C+I">I. Bekman</a>, <a href="/search/nucl-ex?searchtype=author&query=Bergevin%2C+M">M. Bergevin</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezerra%2C+T+J+C">T. J. C. Bezerra</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukov%2C+L">L. Bezrukov</a>, <a href="/search/nucl-ex?searchtype=author&query=Blucher%2C+E">E. Blucher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brugi%C3%A8re%2C+T">T. Brugi猫re</a>, <a href="/search/nucl-ex?searchtype=author&query=Buck%2C+C">C. Buck</a>, <a href="/search/nucl-ex?searchtype=author&query=Busenitz%2C+J">J. Busenitz</a>, <a href="/search/nucl-ex?searchtype=author&query=Cabrera%2C+A">A. Cabrera</a>, <a href="/search/nucl-ex?searchtype=author&query=Camilleri%2C+L">L. Camilleri</a>, <a href="/search/nucl-ex?searchtype=author&query=Carr%2C+R">R. Carr</a>, <a href="/search/nucl-ex?searchtype=author&query=Cerrada%2C+M">M. Cerrada</a>, <a href="/search/nucl-ex?searchtype=author&query=Chauveau%2C+E">E. Chauveau</a>, <a href="/search/nucl-ex?searchtype=author&query=Chimenti%2C+P">P. Chimenti</a>, <a href="/search/nucl-ex?searchtype=author&query=Collin%2C+A+P">A. P. Collin</a>, <a href="/search/nucl-ex?searchtype=author&query=Conover%2C+E">E. Conover</a>, <a href="/search/nucl-ex?searchtype=author&query=Conrad%2C+J+M">J. M. Conrad</a> , et al. (122 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="1512.07562v2-abstract-short" style="display: inline;"> Using the Double Chooz detector, designed to measure the neutrino mixing angle $胃_{13}$, the products of $渭^-$ capture on $^{12}$C, $^{13}$C, $^{14}$N and $^{16}$O have been measured. Over a period of 489.5 days, $2.3\times10^6$ stopping cosmic $渭^-$ have been collected, of which $1.8\times10^5$ captured on carbon, nitrogen, or oxygen nuclei in the inner detector scintillator or acrylic vessels. T… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1512.07562v2-abstract-full').style.display = 'inline'; document.getElementById('1512.07562v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1512.07562v2-abstract-full" style="display: none;"> Using the Double Chooz detector, designed to measure the neutrino mixing angle $胃_{13}$, the products of $渭^-$ capture on $^{12}$C, $^{13}$C, $^{14}$N and $^{16}$O have been measured. Over a period of 489.5 days, $2.3\times10^6$ stopping cosmic $渭^-$ have been collected, of which $1.8\times10^5$ captured on carbon, nitrogen, or oxygen nuclei in the inner detector scintillator or acrylic vessels. The resulting isotopes were tagged using prompt neutron emission (when applicable), the subsequent beta decays, and, in some cases, $尾$-delayed neutrons. The most precise measurement of the rate of $^{12}\mathrm C(渭^-,谓)^{12}\mathrm B$ to date is reported: $6.57^{+0.11}_{-0.21}\times10^{3}\,\mathrm s^{-1}$, or $(17.35^{+0.35}_{-0.59})\%$ of nuclear captures. By tagging excited states emitting gammas, the ground state transition rate to $^{12}$B has been determined to be $5.68^{+0.14}_{-0.23}\times10^3\,\mathrm s^{-1}$. The heretofore unobserved reactions $^{12}\mathrm C(渭^-,谓伪)^{8}\mathrm{Li}$, $^{13}\mathrm C(渭^-,谓\mathrm n伪)^{8}\mathrm{Li}$, and $^{13}\mathrm C(渭^-,谓\mathrm n)^{12}\mathrm B$ are measured. Further, a population of $尾$n decays following stopping muons is identified with $5.5蟽$ significance. Statistics limit our ability to identify these decays definitively. Assuming negligible production of $^{8}$He, the reaction $^{13}\mathrm C(渭^-,谓伪)^{9}\mathrm{Li}$ is found to be present at the $2.7蟽$ level. Limits are set on a variety of other processes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1512.07562v2-abstract-full').style.display = 'none'; document.getElementById('1512.07562v2-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> 17 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 December, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">21 pages, 14 figures. Minor revisions. Corresponding author: M. Strait</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 93, 054608 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1210.3748">arXiv:1210.3748</a> <span> [<a href="https://arxiv.org/pdf/1210.3748">pdf</a>, <a href="https://arxiv.org/format/1210.3748">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> </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/PhysRevD.87.011102">10.1103/PhysRevD.87.011102 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct Measurement of Backgrounds using Reactor-Off Data in Double Chooz </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Abe%2C+Y">Y. Abe</a>, <a href="/search/nucl-ex?searchtype=author&query=Aberle%2C+C">C. Aberle</a>, <a href="/search/nucl-ex?searchtype=author&query=Anjos%2C+J+C+d">J. C. dos Anjos</a>, <a href="/search/nucl-ex?searchtype=author&query=Barriere%2C+J+C">J. C. Barriere</a>, <a href="/search/nucl-ex?searchtype=author&query=Bergevin%2C+M">M. Bergevin</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernstein%2C+A">A. Bernstein</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezerra%2C+T+J+C">T. J. C. Bezerra</a>, <a href="/search/nucl-ex?searchtype=author&query=Bezrukhov%2C+L">L. Bezrukhov</a>, <a href="/search/nucl-ex?searchtype=author&query=Blucher%2C+E">E. Blucher</a>, <a href="/search/nucl-ex?searchtype=author&query=Bowden%2C+N+S">N. S. Bowden</a>, <a href="/search/nucl-ex?searchtype=author&query=Buck%2C+C">C. Buck</a>, <a href="/search/nucl-ex?searchtype=author&query=Busenitz%2C+J">J. Busenitz</a>, <a href="/search/nucl-ex?searchtype=author&query=Cabrera%2C+A">A. Cabrera</a>, <a href="/search/nucl-ex?searchtype=author&query=Caden%2C+E">E. Caden</a>, <a href="/search/nucl-ex?searchtype=author&query=Camilleri%2C+L">L. Camilleri</a>, <a href="/search/nucl-ex?searchtype=author&query=Carr%2C+R">R. Carr</a>, <a href="/search/nucl-ex?searchtype=author&query=Cerrada%2C+M">M. Cerrada</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+P+-">P. -J. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chimenti%2C+P">P. Chimenti</a>, <a href="/search/nucl-ex?searchtype=author&query=Classen%2C+T">T. Classen</a>, <a href="/search/nucl-ex?searchtype=author&query=Collin%2C+A+P">A. P. Collin</a>, <a href="/search/nucl-ex?searchtype=author&query=Conover%2C+E">E. Conover</a>, <a href="/search/nucl-ex?searchtype=author&query=Conrad%2C+J+M">J. M. Conrad</a>, <a href="/search/nucl-ex?searchtype=author&query=Crespo-Anadon%2C+J+I">J. I. Crespo-Anadon</a>, <a href="/search/nucl-ex?searchtype=author&query=Crum%2C+K">K. Crum</a> , et al. (148 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="1210.3748v2-abstract-short" style="display: inline;"> Double Chooz is unique among modern reactor-based neutrino experiments studying $\bar 谓_e$ disappearance in that data can be collected with all reactors off. In this paper, we present data from 7.53 days of reactor-off running. Applying the same selection criteria as used in the Double Chooz reactor-on oscillation analysis, a measured background rate of 1.0$\pm$0.4 events/day is obtained. The back… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.3748v2-abstract-full').style.display = 'inline'; document.getElementById('1210.3748v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1210.3748v2-abstract-full" style="display: none;"> Double Chooz is unique among modern reactor-based neutrino experiments studying $\bar 谓_e$ disappearance in that data can be collected with all reactors off. In this paper, we present data from 7.53 days of reactor-off running. Applying the same selection criteria as used in the Double Chooz reactor-on oscillation analysis, a measured background rate of 1.0$\pm$0.4 events/day is obtained. The background model for accidentals, cosmogenic $尾$-$n$-emitting isotopes, fast neutrons from cosmic muons, and stopped-$渭$ decays used in the oscillation analysis is demonstrated to be correct within the uncertainties. Kinematic distributions of the events, which are dominantly cosmic-ray-produced correlated-background events, are provided. The background rates are scaled to the shielding depths of two other reactor-based oscillation experiments, Daya Bay and RENO. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.3748v2-abstract-full').style.display = 'none'; document.getElementById('1210.3748v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 October, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 October, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">V2 has corrections to affiliations</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1210.1194">arXiv:1210.1194</a> <span> [<a href="https://arxiv.org/pdf/1210.1194">pdf</a>, <a href="https://arxiv.org/ps/1210.1194">ps</a>, <a href="https://arxiv.org/format/1210.1194">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.87.065801">10.1103/PhysRevC.87.065801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nuclear structure of 30S and its implications for nucleosynthesis in classical novae </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Setoodehnia%2C+K">K. Setoodehnia</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+A+A">A. A. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Kahl%2C+D">D. Kahl</a>, <a href="/search/nucl-ex?searchtype=author&query=Komatsubara%2C+T">T. Komatsubara</a>, <a href="/search/nucl-ex?searchtype=author&query=Jos%C3%A9%2C+J">J. Jos茅</a>, <a href="/search/nucl-ex?searchtype=author&query=Longland%2C+R">R. Longland</a>, <a href="/search/nucl-ex?searchtype=author&query=Abe%2C+Y">Y. Abe</a>, <a href="/search/nucl-ex?searchtype=author&query=Binh%2C+D+N">D. N. Binh</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J">J. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Cherubini%2C+S">S. Cherubini</a>, <a href="/search/nucl-ex?searchtype=author&query=Clark%2C+J+A">J. A. Clark</a>, <a href="/search/nucl-ex?searchtype=author&query=Deibel%2C+C+M">C. M. Deibel</a>, <a href="/search/nucl-ex?searchtype=author&query=Fukuoka%2C+S">S. Fukuoka</a>, <a href="/search/nucl-ex?searchtype=author&query=Hashimoto%2C+T">T. Hashimoto</a>, <a href="/search/nucl-ex?searchtype=author&query=Hayakawa%2C+T">T. Hayakawa</a>, <a href="/search/nucl-ex?searchtype=author&query=Hendriks%2C+J">J. Hendriks</a>, <a href="/search/nucl-ex?searchtype=author&query=Ishibashi%2C+Y">Y. Ishibashi</a>, <a href="/search/nucl-ex?searchtype=author&query=Ito%2C+Y">Y. Ito</a>, <a href="/search/nucl-ex?searchtype=author&query=Kubono%2C+S">S. Kubono</a>, <a href="/search/nucl-ex?searchtype=author&query=Lennard%2C+W+N">W. N. Lennard</a>, <a href="/search/nucl-ex?searchtype=author&query=Moriguchi%2C+T">T. Moriguchi</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagae%2C+D">D. Nagae</a>, <a href="/search/nucl-ex?searchtype=author&query=Nishikiori%2C+R">R. Nishikiori</a>, <a href="/search/nucl-ex?searchtype=author&query=Niwa%2C+T">T. Niwa</a>, <a href="/search/nucl-ex?searchtype=author&query=Ozawa%2C+A">A. Ozawa</a> , et al. (7 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="1210.1194v1-abstract-short" style="display: inline;"> The uncertainty in the 29P(p,gamma)30S reaction rate over the temperature range of 0.1 - 1.3 GK was previously determined to span ~4 orders of magnitude due to the uncertain location of two previously unobserved 3+ and 2+ resonances in the 4.7 - 4.8 MeV excitation region in 30S. Therefore, the abundances of silicon isotopes synthesized in novae, which are relevant for the identification of presola… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.1194v1-abstract-full').style.display = 'inline'; document.getElementById('1210.1194v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1210.1194v1-abstract-full" style="display: none;"> The uncertainty in the 29P(p,gamma)30S reaction rate over the temperature range of 0.1 - 1.3 GK was previously determined to span ~4 orders of magnitude due to the uncertain location of two previously unobserved 3+ and 2+ resonances in the 4.7 - 4.8 MeV excitation region in 30S. Therefore, the abundances of silicon isotopes synthesized in novae, which are relevant for the identification of presolar grains of putative nova origin, were uncertain by a factor of 3. To investigate the level structure of 30S above the proton threshold (4394.9(7) keV), a charged-particle spectroscopy and an in-beam gamma-ray spectroscopy experiments were performed. Differential cross sections of the 32S(p,t)30S reaction were measured at 34.5 MeV. Distorted wave Born approximation calculations were performed to constrain the spin-parity assignments of the observed levels. An energy level scheme was deduced from gamma-gamma coincidence measurements using the 28Si(3He,n-gamma)30S reaction. Spin-parity assignments based on measurements of gamma-ray angular distributions and gamma-gamma directional correlation from oriented nuclei were made for most of the observed levels of 30S. As a result, the resonance energies corresponding to the excited states in 4.5 MeV - 6 MeV region, including the two astrophysically important states predicted previously, are measured with significantly better precision than before. The uncertainty in the rate of the 29P(p,gamma)30S reaction is substantially reduced over the temperature range of interest. Finally, the influence of this rate on the abundance ratios of silicon isotopes synthesized in novae are obtained via 1D hydrodynamic nova simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.1194v1-abstract-full').style.display = 'none'; document.getElementById('1210.1194v1-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 October, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, 12 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1103.1449">arXiv:1103.1449</a> <span> [<a href="https://arxiv.org/pdf/1103.1449">pdf</a>, <a href="https://arxiv.org/ps/1103.1449">ps</a>, <a href="https://arxiv.org/format/1103.1449">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.83.054620">10.1103/PhysRevC.83.054620 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Fusion Hindrance in the Heavy Ion Reactions -- Border Between the Normal and Hindered Fusions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Shen%2C+C">Caiwan Shen</a>, <a href="/search/nucl-ex?searchtype=author&query=Boilley%2C+D">David Boilley</a>, <a href="/search/nucl-ex?searchtype=author&query=Li%2C+Q">Qingfeng Li</a>, <a href="/search/nucl-ex?searchtype=author&query=Shen%2C+J">Junjie Shen</a>, <a href="/search/nucl-ex?searchtype=author&query=Abe%2C+Y">Yasuhisa Abe</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="1103.1449v2-abstract-short" style="display: inline;"> The fusion hindrance in heavy ion collisions is studied in the framework of the two-center liquid drop model. It appears that the neck and the radial degrees of freedom might both be hampered by an inner potential barrier on their path between the contact configuration to the compound nucleus. Heavy ion reactions with and without the two kinds of fusion hindrance are classified through systematic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1103.1449v2-abstract-full').style.display = 'inline'; document.getElementById('1103.1449v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1103.1449v2-abstract-full" style="display: none;"> The fusion hindrance in heavy ion collisions is studied in the framework of the two-center liquid drop model. It appears that the neck and the radial degrees of freedom might both be hampered by an inner potential barrier on their path between the contact configuration to the compound nucleus. Heavy ion reactions with and without the two kinds of fusion hindrance are classified through systematic calculations. It is found that the number of reactions without radial fusion hindrance is much smaller than that without neck fusion hindrance, and for both kinds of fusion hindrance the number of reactions without fusion hindrance at small mass-asymmetry parameter $伪$ is smaller than that at large $伪$. In the formation of a given compound nucleus, if a reaction with $伪_c$ is not hindered, then other reactions with $伪> 伪_c$ are also not hindered as it is well known experimentally. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1103.1449v2-abstract-full').style.display = 'none'; document.getElementById('1103.1449v2-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, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 March, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">14 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.C83:054620,2011 </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/9803005">arXiv:nucl-ex/9803005</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/9803005">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/9803005">ps</a>, <a href="https://arxiv.org/format/nucl-ex/9803005">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Spin-Alignment and Quasi-Molecular Resonances in Heavy-Ion Collision </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Nouicer%2C+R">R. Nouicer</a>, <a href="/search/nucl-ex?searchtype=author&query=Beck%2C+C">C. Beck</a>, <a href="/search/nucl-ex?searchtype=author&query=Sanders%2C+S+J">S. J. Sanders</a>, <a href="/search/nucl-ex?searchtype=author&query=de+Toledo%2C+A+S">A. Szanto de Toledo</a>, <a href="/search/nucl-ex?searchtype=author&query=Cavallaro%2C+S">Sl. Cavallaro</a>, <a href="/search/nucl-ex?searchtype=author&query=Uegaki%2C+E">E. Uegaki</a>, <a href="/search/nucl-ex?searchtype=author&query=Abe%2C+Y">Y. Abe</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/9803005v1-abstract-short" style="display: inline;"> Fragment-fragment-$纬$ triple coincidence measurements of the $^{28}$Si~$+$~$^{28}$Si reaction at E$_{\rm c.m.}$~=~55.8 MeV, carefully chosen to populate a well known quasi-molecular resonance in $^{56}$Ni, have been performed at the VIVITRON tandem facility by using the Eurogam Phase~II $纬$-ray spectrometer. In the $^{28}$Si~$+$~$^{28}$Si reaction, the resonant behavior of the $^{28}$Si $+$… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/9803005v1-abstract-full').style.display = 'inline'; document.getElementById('nucl-ex/9803005v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/9803005v1-abstract-full" style="display: none;"> Fragment-fragment-$纬$ triple coincidence measurements of the $^{28}$Si~$+$~$^{28}$Si reaction at E$_{\rm c.m.}$~=~55.8 MeV, carefully chosen to populate a well known quasi-molecular resonance in $^{56}$Ni, have been performed at the VIVITRON tandem facility by using the Eurogam Phase~II $纬$-ray spectrometer. In the $^{28}$Si~$+$~$^{28}$Si reaction, the resonant behavior of the $^{28}$Si $+$ $^{28}$Si exit-channel is clearly observed by the present fragment-fragment coincidence data. The more unexpected result is the spin disalignment of the $^{28}$Si $+$ $^{28}$Si resonance. This has been demonstrated first by the measured angular distributions of the elastic 0$^{+}$, inelastic 2$^{+}$ and mutual excitation channels 2$^{+}-2^{+}$, which are dominated by a unique and pure partial wave with L = 38 ${\rm \hbar}$, and has been confirmed by measuring their particle-$纬$ angular correlations with Eurogam Phase II. The spin disalignment supports new molecular model predictions, in which the observed resonance would correspond to the ''Butterfly mode''. A discussion concerning the {\it spin alignment and spin disalignment} for different systems : $^{12}$C~$+$~$^{12}$C, $^{24}$Mg~$+$~$^{24}$Mg and $^{28}$Si~$+$~$^{28}$Si will be given.} <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/9803005v1-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/9803005v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 March, 1998; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 1998. </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 standard LaTeX file, 12 Figures available upon request in Postscript files or faxed -- Talk presented at the XXXV! International Winter Meeting on Nuclear Physics, January 26-31, 1998, Bormio, Italy (Proceedings to be published in Ricerca Scientifica ed Educazione Permanente, edited by I. Iori) --</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> IReS-98-07 (IReS Strasbourg and Louis Pasteur University) </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 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