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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/2310.15093">arXiv:2310.15093</a> <span> [<a href="https://arxiv.org/pdf/2310.15093">pdf</a>, <a href="https://arxiv.org/format/2310.15093">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41567-024-02612-y">10.1038/s41567-024-02612-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electromagnetic Properties of Indium Isotopes Elucidate the Doubly Magic Character of $^{100}$Sn </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Karthein%2C+J">J. Karthein</a>, <a href="/search/physics?searchtype=author&query=Ricketts%2C+C+M">C. M. Ricketts</a>, <a href="/search/physics?searchtype=author&query=Ruiz%2C+R+F+G">R. F. Garcia Ruiz</a>, <a href="/search/physics?searchtype=author&query=Billowes%2C+J">J. Billowes</a>, <a href="/search/physics?searchtype=author&query=Binnersley%2C+C+L">C. L. Binnersley</a>, <a href="/search/physics?searchtype=author&query=Cocolios%2C+T+E">T. E. Cocolios</a>, <a href="/search/physics?searchtype=author&query=Dobaczewski%2C+J">J. Dobaczewski</a>, <a href="/search/physics?searchtype=author&query=Farooq-Smith%2C+G+J">G. J. Farooq-Smith</a>, <a href="/search/physics?searchtype=author&query=Flanagan%2C+K+T">K. T. Flanagan</a>, <a href="/search/physics?searchtype=author&query=Georgiev%2C+G">G. Georgiev</a>, <a href="/search/physics?searchtype=author&query=Gins%2C+W">W. Gins</a>, <a href="/search/physics?searchtype=author&query=de+Groote%2C+R+P">R. P. de Groote</a>, <a href="/search/physics?searchtype=author&query=Gustafsson%2C+F+P">F. P. Gustafsson</a>, <a href="/search/physics?searchtype=author&query=Holt%2C+J+D">J. D. Holt</a>, <a href="/search/physics?searchtype=author&query=Kanellakopoulos%2C+A">A. Kanellakopoulos</a>, <a href="/search/physics?searchtype=author&query=Koszor%C3%BAs%2C+%C3%81">脕. Koszor煤s</a>, <a href="/search/physics?searchtype=author&query=Leimbach%2C+D">D. Leimbach</a>, <a href="/search/physics?searchtype=author&query=Lynch%2C+K+M">K. M. Lynch</a>, <a href="/search/physics?searchtype=author&query=Miyagi%2C+T">T. Miyagi</a>, <a href="/search/physics?searchtype=author&query=Nazarewicz%2C+W">W. Nazarewicz</a>, <a href="/search/physics?searchtype=author&query=Neyens%2C+G">G. Neyens</a>, <a href="/search/physics?searchtype=author&query=Reinhard%2C+P+-">P. -G. Reinhard</a>, <a href="/search/physics?searchtype=author&query=Sahoo%2C+B+K">B. K. Sahoo</a>, <a href="/search/physics?searchtype=author&query=Vernon%2C+A+R">A. R. Vernon</a>, <a href="/search/physics?searchtype=author&query=Wilkins%2C+S+G">S. G. Wilkins</a> , et al. (2 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="2310.15093v3-abstract-short" style="display: inline;"> Our understanding of nuclear properties in the vicinity of $^{100}$Sn, suggested to be the heaviest doubly magic nucleus with equal numbers of protons (Z=50) and neutrons (N=50), has been a long-standing challenge for experimental and theoretical nuclear physics. Contradictory experimental evidence exists on the role of nuclear collectivity in this region of the nuclear chart. Using precision lase… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.15093v3-abstract-full').style.display = 'inline'; document.getElementById('2310.15093v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.15093v3-abstract-full" style="display: none;"> Our understanding of nuclear properties in the vicinity of $^{100}$Sn, suggested to be the heaviest doubly magic nucleus with equal numbers of protons (Z=50) and neutrons (N=50), has been a long-standing challenge for experimental and theoretical nuclear physics. Contradictory experimental evidence exists on the role of nuclear collectivity in this region of the nuclear chart. Using precision laser spectroscopy, we measured the ground-state electromagnetic moments of indium (Z=49) isotopes approaching the N=50 neutron number down to 101In, and nuclear charge radii of 101-131In spanning almost the complete range between the two major neutron closed-shells at N=50 and N=82. Our results for both nuclear charge radii and quadrupole moments reveal striking parabolic trends as a function of the neutron number, with a clear reduction toward these two neutron closed-shells, thus supporting a doubly magic character of $^{100}$Sn. Two complementary nuclear many-body frameworks, density functional theory and ab initio methods, elucidate our findings. A detailed comparison with our experimental results exposes deficiencies of nuclear models, establishing a benchmark for future theoretical developments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.15093v3-abstract-full').style.display = 'none'; document.getElementById('2310.15093v3-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 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 6 figures, 4 tables; text-identical to Nature Physics article (2024)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2105.10549">arXiv:2105.10549</a> <span> [<a href="https://arxiv.org/pdf/2105.10549">pdf</a>, <a href="https://arxiv.org/format/2105.10549">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.127.033001">10.1103/PhysRevLett.127.033001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Isotope Shifts of Radium Monofluoride Molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Udrescu%2C+S+M">S. M. Udrescu</a>, <a href="/search/physics?searchtype=author&query=Brinson%2C+A+J">A. J. Brinson</a>, <a href="/search/physics?searchtype=author&query=Ruiz%2C+R+F+G">R. F. Garcia Ruiz</a>, <a href="/search/physics?searchtype=author&query=Gaul%2C+K">K. Gaul</a>, <a href="/search/physics?searchtype=author&query=Berger%2C+R">R. Berger</a>, <a href="/search/physics?searchtype=author&query=Billowes%2C+J">J. Billowes</a>, <a href="/search/physics?searchtype=author&query=Binnersley%2C+C+L">C. L. Binnersley</a>, <a href="/search/physics?searchtype=author&query=Bissell%2C+M+L">M. L. Bissell</a>, <a href="/search/physics?searchtype=author&query=Breier%2C+A+A">A. A. Breier</a>, <a href="/search/physics?searchtype=author&query=Chrysalidis%2C+K">K. Chrysalidis</a>, <a href="/search/physics?searchtype=author&query=Cocolios%2C+T+E">T. E. Cocolios</a>, <a href="/search/physics?searchtype=author&query=Cooper%2C+B+S">B. S. Cooper</a>, <a href="/search/physics?searchtype=author&query=Flanagan%2C+K+T">K. T. Flanagan</a>, <a href="/search/physics?searchtype=author&query=Giesen%2C+T+F">T. F. Giesen</a>, <a href="/search/physics?searchtype=author&query=de+Groote%2C+R+P">R. P. de Groote</a>, <a href="/search/physics?searchtype=author&query=Franchoo%2C+S">S. Franchoo</a>, <a href="/search/physics?searchtype=author&query=Gustafsson%2C+F+P">F. P. Gustafsson</a>, <a href="/search/physics?searchtype=author&query=Isaev%2C+T+A">T. A. Isaev</a>, <a href="/search/physics?searchtype=author&query=Koszorus%2C+A">A. Koszorus</a>, <a href="/search/physics?searchtype=author&query=Neyens%2C+G">G. Neyens</a>, <a href="/search/physics?searchtype=author&query=Perrett%2C+H+A">H. A. Perrett</a>, <a href="/search/physics?searchtype=author&query=Ricketts%2C+C+M">C. M. Ricketts</a>, <a href="/search/physics?searchtype=author&query=Rothe%2C+S">S. Rothe</a>, <a href="/search/physics?searchtype=author&query=Vernon%2C+A+R">A. R. Vernon</a>, <a href="/search/physics?searchtype=author&query=Wendt%2C+K+D+A">K. D. A. Wendt</a> , et al. (3 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="2105.10549v1-abstract-short" style="display: inline;"> Isotope shifts of $^{223-226,228}$Ra$^{19}$F were measured for different vibrational levels in the electronic transition $A^{2}{}螤_{1/2}\leftarrow X^{2}{}危^{+}$. The observed isotope shifts demonstrate the particularly high sensitivity of radium monofluoride to nuclear size effects, offering a stringent test of models describing the electronic density within the radium nucleus. Ab initio quantum c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.10549v1-abstract-full').style.display = 'inline'; document.getElementById('2105.10549v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2105.10549v1-abstract-full" style="display: none;"> Isotope shifts of $^{223-226,228}$Ra$^{19}$F were measured for different vibrational levels in the electronic transition $A^{2}{}螤_{1/2}\leftarrow X^{2}{}危^{+}$. The observed isotope shifts demonstrate the particularly high sensitivity of radium monofluoride to nuclear size effects, offering a stringent test of models describing the electronic density within the radium nucleus. Ab initio quantum chemical calculations are in excellent agreement with experimental observations. These results highlight some of the unique opportunities that short-lived molecules could offer in nuclear structure and in fundamental symmetry studies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.10549v1-abstract-full').style.display = 'none'; document.getElementById('2105.10549v1-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 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">The paper was accepted for publication as a Letter in Physical Review Letters</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2012.10374">arXiv:2012.10374</a> <span> [<a href="https://arxiv.org/pdf/2012.10374">pdf</a>, <a href="https://arxiv.org/format/2012.10374">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="Instrumentation and Methods for Astrophysics">astro-ph.IM</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/10.1140/epja/s10050-021-00507-7">10.1140/epja/s10050-021-00507-7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Imaging neutron capture cross sections: i-TED proof-of-concept and future prospects based on Machine-Learning techniques </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Babiano-Su%C3%A1rez%2C+V">V. Babiano-Su谩rez</a>, <a href="/search/physics?searchtype=author&query=Lerendegui-Marco%2C+J">J. Lerendegui-Marco</a>, <a href="/search/physics?searchtype=author&query=Balibrea-Correa%2C+J">J. Balibrea-Correa</a>, <a href="/search/physics?searchtype=author&query=Caballero%2C+L">L. Caballero</a>, <a href="/search/physics?searchtype=author&query=Calvo%2C+D">D. Calvo</a>, <a href="/search/physics?searchtype=author&query=Ladarescu%2C+I">I. Ladarescu</a>, <a href="/search/physics?searchtype=author&query=Domingo-Pardo%2C+C">C. Domingo-Pardo</a>, <a href="/search/physics?searchtype=author&query=Calvi%C3%B1o%2C+F">F. Calvi帽o</a>, <a href="/search/physics?searchtype=author&query=Casanovas%2C+A">A. Casanovas</a>, <a href="/search/physics?searchtype=author&query=Tarife%C3%B1o-Saldivia%2C+A">A. Tarife帽o-Saldivia</a>, <a href="/search/physics?searchtype=author&query=Alcayne%2C+V">V. Alcayne</a>, <a href="/search/physics?searchtype=author&query=Guerrero%2C+C">C. Guerrero</a>, <a href="/search/physics?searchtype=author&query=Mill%C3%A1n-Callado%2C+M+A">M. A. Mill谩n-Callado</a>, <a href="/search/physics?searchtype=author&query=Gonz%C3%A1lez%2C+M+T+R">M. T. Rodr铆guez Gonz谩lez</a>, <a href="/search/physics?searchtype=author&query=Barbagallo%2C+M">M. Barbagallo</a>, <a href="/search/physics?searchtype=author&query=Aberle%2C+O">O. Aberle</a>, <a href="/search/physics?searchtype=author&query=Amaducci%2C+S">S. Amaducci</a>, <a href="/search/physics?searchtype=author&query=Andrzejewski%2C+J">J. Andrzejewski</a>, <a href="/search/physics?searchtype=author&query=Audouin%2C+L">L. Audouin</a>, <a href="/search/physics?searchtype=author&query=Bacak%2C+M">M. Bacak</a>, <a href="/search/physics?searchtype=author&query=Bennett%2C+S">S. Bennett</a>, <a href="/search/physics?searchtype=author&query=Berthoumieux%2C+E">E. Berthoumieux</a>, <a href="/search/physics?searchtype=author&query=Billowes%2C+J">J. Billowes</a>, <a href="/search/physics?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/physics?searchtype=author&query=Brown%2C+A">A. Brown</a> , et al. (110 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="2012.10374v1-abstract-short" style="display: inline;"> i-TED is an innovative detection system which exploits Compton imaging techniques to achieve a superior signal-to-background ratio in ($n,纬$) cross-section measurements using time-of-flight technique. This work presents the first experimental validation of the i-TED apparatus for high-resolution time-of-flight experiments and demonstrates for the first time the concept proposed for background reje… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.10374v1-abstract-full').style.display = 'inline'; document.getElementById('2012.10374v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2012.10374v1-abstract-full" style="display: none;"> i-TED is an innovative detection system which exploits Compton imaging techniques to achieve a superior signal-to-background ratio in ($n,纬$) cross-section measurements using time-of-flight technique. This work presents the first experimental validation of the i-TED apparatus for high-resolution time-of-flight experiments and demonstrates for the first time the concept proposed for background rejection. To this aim both $^{197}$Au($n,纬$) and $^{56}$Fe($n, 纬$) reactions were measured at CERN n\_TOF using an i-TED demonstrator based on only three position-sensitive detectors. Two \cds detectors were also used to benchmark the performance of i-TED. The i-TED prototype built for this study shows a factor of $\sim$3 higher detection sensitivity than state-of-the-art \cds detectors in the $\sim$10~keV neutron energy range of astrophysical interest. This paper explores also the perspectives of further enhancement in performance attainable with the final i-TED array consisting of twenty position-sensitive detectors and new analysis methodologies based on Machine-Learning techniques. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.10374v1-abstract-full').style.display = 'none'; document.getElementById('2012.10374v1-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 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 16 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/2012.01864">arXiv:2012.01864</a> <span> [<a href="https://arxiv.org/pdf/2012.01864">pdf</a>, <a href="https://arxiv.org/format/2012.01864">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41567-020-01136-5">10.1038/s41567-020-01136-5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of $N = 32$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Koszor%C3%BAs%2C+%C3%81">脕. Koszor煤s</a>, <a href="/search/physics?searchtype=author&query=Yang%2C+X+F">X. F. Yang</a>, <a href="/search/physics?searchtype=author&query=Jiang%2C+W+G">W. G. Jiang</a>, <a href="/search/physics?searchtype=author&query=Novario%2C+S+J">S. J. Novario</a>, <a href="/search/physics?searchtype=author&query=Bai%2C+S+W">S. W. Bai</a>, <a href="/search/physics?searchtype=author&query=Billowes%2C+J">J. Billowes</a>, <a href="/search/physics?searchtype=author&query=Binnersley%2C+C+L">C. L. Binnersley</a>, <a href="/search/physics?searchtype=author&query=Bissell%2C+M+L">M. L. Bissell</a>, <a href="/search/physics?searchtype=author&query=Cocolios%2C+T+E">T. E. Cocolios</a>, <a href="/search/physics?searchtype=author&query=Cooper%2C+B+S">B. S. Cooper</a>, <a href="/search/physics?searchtype=author&query=de+Groote%2C+R+P">R. P. de Groote</a>, <a href="/search/physics?searchtype=author&query=Ekstr%C3%B6m%2C+A">A. Ekstr枚m</a>, <a href="/search/physics?searchtype=author&query=Flanagan%2C+K+T">K. T. Flanagan</a>, <a href="/search/physics?searchtype=author&query=Forss%C3%A9n%2C+C">C. Forss茅n</a>, <a href="/search/physics?searchtype=author&query=Franchoo%2C+S">S. Franchoo</a>, <a href="/search/physics?searchtype=author&query=Ruiz%2C+R+F+G">R. F. Garcia Ruiz</a>, <a href="/search/physics?searchtype=author&query=Gustafsson%2C+F+P">F. P. Gustafsson</a>, <a href="/search/physics?searchtype=author&query=Hagen%2C+G">G. Hagen</a>, <a href="/search/physics?searchtype=author&query=Jansen%2C+G+R">G. R. Jansen</a>, <a href="/search/physics?searchtype=author&query=Kanellakopoulos%2C+A">A. Kanellakopoulos</a>, <a href="/search/physics?searchtype=author&query=Kortelainen%2C+M">M. Kortelainen</a>, <a href="/search/physics?searchtype=author&query=Nazarewicz%2C+W">W. Nazarewicz</a>, <a href="/search/physics?searchtype=author&query=Neyens%2C+G">G. Neyens</a>, <a href="/search/physics?searchtype=author&query=Papenbrock%2C+T">T. Papenbrock</a>, <a href="/search/physics?searchtype=author&query=Reinhard%2C+P+-">P. -G. Reinhard</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="2012.01864v1-abstract-short" style="display: inline;"> Nuclear charge radii are sensitive probes of different aspects of the nucleon-nucleon interaction and the bulk properties of nuclear matter; thus, they provide a stringent test and challenge for nuclear theory. The calcium region has been of particular interest, as experimental evidence has suggested a new magic number at $N = 32$ [1-3], while the unexpectedly large increases in the charge radii [… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.01864v1-abstract-full').style.display = 'inline'; document.getElementById('2012.01864v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2012.01864v1-abstract-full" style="display: none;"> Nuclear charge radii are sensitive probes of different aspects of the nucleon-nucleon interaction and the bulk properties of nuclear matter; thus, they provide a stringent test and challenge for nuclear theory. The calcium region has been of particular interest, as experimental evidence has suggested a new magic number at $N = 32$ [1-3], while the unexpectedly large increases in the charge radii [4,5] open new questions about the evolution of nuclear size in neutron-rich systems. By combining the collinear resonance ionization spectroscopy method with $尾$-decay detection, we were able to extend the charge radii measurement of potassium ($Z =19$) isotopes up to the exotic $^{52}$K ($t_{1/2}$ = 110 ms), produced in minute quantities. Our work provides the first charge radii measurement beyond $N = 32$ in the region, revealing no signature of the magic character at this neutron number. The results are interpreted with two state-of-the-art nuclear theories. For the first time, a long sequence of isotopes could be calculated with coupled-cluster calculations based on newly developed nuclear interactions. The strong increase in the charge radii beyond $N = 28$ is not well captured by these calculations, but is well reproduced by Fayans nuclear density functional theory, which, however, overestimates the odd-even staggering effect. These findings highlight our limited understanding on the nuclear size of neutron-rich systems, and expose pressing problems that are present in some of the best current models of nuclear theory. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.01864v1-abstract-full').style.display = 'none'; document.getElementById('2012.01864v1-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 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">submitted version; revision accepted in Nature Physics</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Physics 17, 439 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.06051">arXiv:2005.06051</a> <span> [<a href="https://arxiv.org/pdf/2005.06051">pdf</a>, <a href="https://arxiv.org/format/2005.06051">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41598-020-68218-5">10.1038/s41598-020-68218-5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Laser spectroscopy of indium Rydberg atom bunches by electric field ionization </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Vernon%2C+A+R">A. R. Vernon</a>, <a href="/search/physics?searchtype=author&query=Ricketts%2C+C+M">C. M. Ricketts</a>, <a href="/search/physics?searchtype=author&query=Billowes%2C+J">J. Billowes</a>, <a href="/search/physics?searchtype=author&query=Cocolios%2C+T+E">T. E. Cocolios</a>, <a href="/search/physics?searchtype=author&query=Cooper%2C+B+S">B. S. Cooper</a>, <a href="/search/physics?searchtype=author&query=Flanagan%2C+K+T">K. T. Flanagan</a>, <a href="/search/physics?searchtype=author&query=Ruiz%2C+R+F+G">R. F. Garcia Ruiz</a>, <a href="/search/physics?searchtype=author&query=Gustafsson%2C+F+P">F. P. Gustafsson</a>, <a href="/search/physics?searchtype=author&query=Neyens%2C+G">G. Neyens</a>, <a href="/search/physics?searchtype=author&query=Perrett%2C+H+A">H. A. Perrett</a>, <a href="/search/physics?searchtype=author&query=Sahoo%2C+B+K">B. K. Sahoo</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+Q">Q. Wang</a>, <a href="/search/physics?searchtype=author&query=Waso%2C+F+J">F. J. Waso</a>, <a href="/search/physics?searchtype=author&query=Yang%2C+X+F">X. F. Yang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2005.06051v1-abstract-short" style="display: inline;"> This work reports on the application of a novel electric field-ionization setup for high-resolution laser spectroscopy measurements on bunched fast atomic beams in a collinear geometry. In combination with multi-step resonant excitation to Rydberg states using pulsed lasers, the field ionization technique demonstrates increased sensitivity for isotope separation and measurement of atomic parameter… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.06051v1-abstract-full').style.display = 'inline'; document.getElementById('2005.06051v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.06051v1-abstract-full" style="display: none;"> This work reports on the application of a novel electric field-ionization setup for high-resolution laser spectroscopy measurements on bunched fast atomic beams in a collinear geometry. In combination with multi-step resonant excitation to Rydberg states using pulsed lasers, the field ionization technique demonstrates increased sensitivity for isotope separation and measurement of atomic parameters over non-resonant laser ionization methods. The setup was tested at the Collinear Resonance Ionization Spectroscopy experiment at ISOLDE-CERN to perform high-resolution measurements of transitions in the indium atom from the 5s$^2$5d~$^2$D$_{5/2}$ and 5s$^2$5d~$^2$D$_{3/2}$ states to 5s$^2$($n$)p~$^2$P and 5s$^2$($n$)f~$^2$F Rydberg states, up to a principal quantum number of $n$ = 72. The extracted Rydberg level energies were used to re-evaluate the ionization potential of the indium atom to be 46670.1055(21) cm$^{-1}$. The nuclear magnetic dipole and nuclear electric quadrupole hyperfine structure constants and level isotope shifts of the 5s$^2$5d~$^2$D$_{5/2}$ and 5s$^2$5d~$^2$D$_{3/2}$ states were determined for $^{113,115}$In. The results are compared to calculations using relativistic coupled-cluster theory. A good agreement is found with the ionization potential and isotope shifts, while disagreement of hyperfine structure constants indicates an increased importance of electron correlations in these excited atomic states. With the aim of further increasing the detection sensitivity for measurements on exotic isotopes, a systematic study of the field-ionization arrangement implemented in the work was performed and an improved design was simulated and is presented. The improved design offers increased background suppression independent of the distance from field ionization to ion detection. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.06051v1-abstract-full').style.display = 'none'; document.getElementById('2005.06051v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1911.02812">arXiv:1911.02812</a> <span> [<a href="https://arxiv.org/pdf/1911.02812">pdf</a>, <a href="https://arxiv.org/format/1911.02812">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/ab66dd">10.1088/1367-2630/ab66dd <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Analytic Response Relativistic Coupled-Cluster Theory: The first application to indium isotope shifts </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sahoo%2C+B+K">B. K. Sahoo</a>, <a href="/search/physics?searchtype=author&query=Vernon%2C+A+R">A. R. Vernon</a>, <a href="/search/physics?searchtype=author&query=Ruiz%2C+R+F+G">R. F. Garcia Ruiz</a>, <a href="/search/physics?searchtype=author&query=Binnersley%2C+C+L">C. L. Binnersley</a>, <a href="/search/physics?searchtype=author&query=Billowes%2C+J">J. Billowes</a>, <a href="/search/physics?searchtype=author&query=Bissell%2C+M+L">M. L. Bissell</a>, <a href="/search/physics?searchtype=author&query=Cocolios%2C+T+E">T. E. Cocolios</a>, <a href="/search/physics?searchtype=author&query=Farooq-Smith%2C+G+J">G. J. Farooq-Smith</a>, <a href="/search/physics?searchtype=author&query=Flanagan%2C+K+T">K. T. Flanagan</a>, <a href="/search/physics?searchtype=author&query=Gins%2C+W">W. Gins</a>, <a href="/search/physics?searchtype=author&query=de+Groote%2C+R+P">R. P. de Groote</a>, <a href="/search/physics?searchtype=author&query=Koszorus%2C+A">A. Koszorus</a>, <a href="/search/physics?searchtype=author&query=Neyens%2C+G">G. Neyens</a>, <a href="/search/physics?searchtype=author&query=Lynch%2C+K+M">K. M. Lynch</a>, <a href="/search/physics?searchtype=author&query=Parnefjord-Gustafsson%2C+F">F. Parnefjord-Gustafsson</a>, <a href="/search/physics?searchtype=author&query=Ricketts%2C+C+M">C. M. Ricketts</a>, <a href="/search/physics?searchtype=author&query=Wendt%2C+K+D+A">K. D. A Wendt</a>, <a href="/search/physics?searchtype=author&query=Wilkins%2C+S+G">S. G. Wilkins</a>, <a href="/search/physics?searchtype=author&query=Yang%2C+X+F">X. F. Yang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1911.02812v1-abstract-short" style="display: inline;"> With increasing demand for accurate calculation of isotope shifts of atomic systems for fundamental and nuclear structure research, an analytic energy derivative approach is presented in the relativistic coupled-cluster theory framework to determine the atomic field shift and mass shift factors. This approach allows the determination of expectation values of atomic operators, overcoming fundamenta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.02812v1-abstract-full').style.display = 'inline'; document.getElementById('1911.02812v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1911.02812v1-abstract-full" style="display: none;"> With increasing demand for accurate calculation of isotope shifts of atomic systems for fundamental and nuclear structure research, an analytic energy derivative approach is presented in the relativistic coupled-cluster theory framework to determine the atomic field shift and mass shift factors. This approach allows the determination of expectation values of atomic operators, overcoming fundamental problems that are present in existing atomic physics methods, i.e. it satisfies the Hellmann-Feynman theorem, does not involve any non-terminating series, and is free from choice of any perturbative parameter. As a proof of concept, the developed analytic response relativistic coupled-cluster theory has been applied to determine mass shift and field shift factors for different atomic states of indium. High-precision isotope-shift measurements of $^{104-127}$In were performed in the 246.8-nm (5p $^2$P$_{3/2}$ $\rightarrow$ 9s $^2$S$_{1/2}$) and 246.0-nm (5p $^2$P$_{1/2}$ $\rightarrow$ 8s $^2$S$_{1/2}$) transitions to test our theoretical results. An excellent agreement between the theoretical and measured values is found, which is known to be challenging in multi-electron atoms. The calculated atomic factors allowed an accurate determination of the nuclear charge radii of the ground and isomeric states of the $^{104-127}$In isotopes, providing an isotone-independent comparison of the absolute charge radii. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.02812v1-abstract-full').style.display = 'none'; document.getElementById('1911.02812v1-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 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1708.01178">arXiv:1708.01178</a> <span> [<a href="https://arxiv.org/pdf/1708.01178">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2017.12.025">10.1016/j.nima.2017.12.025 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Experimental setup and procedure for the measurement of the 7Be(n,p)7Li reaction at n_TOF </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Barbagallo%2C+M">M. Barbagallo</a>, <a href="/search/physics?searchtype=author&query=Andrzejewski%2C+J">J. Andrzejewski</a>, <a href="/search/physics?searchtype=author&query=Mastromarco%2C+M">M. Mastromarco</a>, <a href="/search/physics?searchtype=author&query=Perkowski%2C+J">J. Perkowski</a>, <a href="/search/physics?searchtype=author&query=Damone%2C+L+A">L. A. Damone</a>, <a href="/search/physics?searchtype=author&query=Gawlik%2C+A">A. Gawlik</a>, <a href="/search/physics?searchtype=author&query=Cosentino%2C+L">L. Cosentino</a>, <a href="/search/physics?searchtype=author&query=Finocchiaro%2C+P">P. Finocchiaro</a>, <a href="/search/physics?searchtype=author&query=Maugeri%2C+E+A">E. A. Maugeri</a>, <a href="/search/physics?searchtype=author&query=Mazzone%2C+A">A. Mazzone</a>, <a href="/search/physics?searchtype=author&query=Dressler%2C+R">R. Dressler</a>, <a href="/search/physics?searchtype=author&query=Heinitz%2C+S">S. Heinitz</a>, <a href="/search/physics?searchtype=author&query=Kivel%2C+N">N. Kivel</a>, <a href="/search/physics?searchtype=author&query=Schumann%2C+D">D. Schumann</a>, <a href="/search/physics?searchtype=author&query=Colonna%2C+N">N. Colonna</a>, <a href="/search/physics?searchtype=author&query=Aberle%2C+O">O. Aberle</a>, <a href="/search/physics?searchtype=author&query=Amaducci%2C+S">S. Amaducci</a>, <a href="/search/physics?searchtype=author&query=Audouin%2C+L">L. Audouin</a>, <a href="/search/physics?searchtype=author&query=Bacak%2C+M">M. Bacak</a>, <a href="/search/physics?searchtype=author&query=Balibrea%2C+J">J. Balibrea</a>, <a href="/search/physics?searchtype=author&query=Be%C4%8Dv%C3%A1%C5%99%2C+F">F. Be膷v谩艡</a>, <a href="/search/physics?searchtype=author&query=Bellia%2C+G">G. Bellia</a>, <a href="/search/physics?searchtype=author&query=Berthoumieux%2C+E">E. Berthoumieux</a>, <a href="/search/physics?searchtype=author&query=Billowes%2C+J">J. Billowes</a>, <a href="/search/physics?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a> , et al. (103 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="1708.01178v1-abstract-short" style="display: inline;"> Following the completion of the second neutron beam line and the related experimental area (EAR2) at the n_TOF spallation neutron source at CERN, several experiments were planned and performed. The high instantaneous neutron flux available in EAR2 allows to investigate neutron indiced reactions with charged particles in the exit channel even employing targets made out of small amounts of short-liv… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.01178v1-abstract-full').style.display = 'inline'; document.getElementById('1708.01178v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1708.01178v1-abstract-full" style="display: none;"> Following the completion of the second neutron beam line and the related experimental area (EAR2) at the n_TOF spallation neutron source at CERN, several experiments were planned and performed. The high instantaneous neutron flux available in EAR2 allows to investigate neutron indiced reactions with charged particles in the exit channel even employing targets made out of small amounts of short-lived radioactive isotopes. After the successful measurement of the 7Be(n,伪)伪 cross section, the 7Be(n,p)7Li reaction was studied in order to provide still missing cross section data of relevance for Big Bang Nucleosynthesis (BBN), in an attempt to find a solution to the cosmological Lithium abundance problem. This paper describes the experimental setup employed in such a measurement and its characterization. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.01178v1-abstract-full').style.display = 'none'; document.getElementById('1708.01178v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 August, 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">Report number:</span> CERN-EP-DRAFT-MISC-2017-002 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1604.00181">arXiv:1604.00181</a> <span> [<a href="https://arxiv.org/pdf/1604.00181">pdf</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> </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.2016.05.089">10.1016/j.nima.2016.05.089 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Experimental setup and procedure for the measurement of the 7Be(n,伪)伪 reaction at n_TOF </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Cosentino%2C+L">L. Cosentino</a>, <a href="/search/physics?searchtype=author&query=Musumarra%2C+A">A. Musumarra</a>, <a href="/search/physics?searchtype=author&query=Barbagallo%2C+M">M. Barbagallo</a>, <a href="/search/physics?searchtype=author&query=Pappalardo%2C+A">A. Pappalardo</a>, <a href="/search/physics?searchtype=author&query=Colonna%2C+N">N. Colonna</a>, <a href="/search/physics?searchtype=author&query=Damone%2C+L">L. Damone</a>, <a href="/search/physics?searchtype=author&query=Piscopo%2C+M">M. Piscopo</a>, <a href="/search/physics?searchtype=author&query=Finocchiaro%2C+P">P. Finocchiaro</a>, <a href="/search/physics?searchtype=author&query=Maugeri%2C+E">E. Maugeri</a>, <a href="/search/physics?searchtype=author&query=Heinitz%2C+S">S. Heinitz</a>, <a href="/search/physics?searchtype=author&query=Schumann%2C+D">D. Schumann</a>, <a href="/search/physics?searchtype=author&query=Dressler%2C+R">R. Dressler</a>, <a href="/search/physics?searchtype=author&query=Kivel%2C+N">N. Kivel</a>, <a href="/search/physics?searchtype=author&query=Aberle%2C+O">O. Aberle</a>, <a href="/search/physics?searchtype=author&query=Andrzejewski%2C+J">J. Andrzejewski</a>, <a href="/search/physics?searchtype=author&query=Audouin%2C+L">L. Audouin</a>, <a href="/search/physics?searchtype=author&query=Ayranov%2C+M">M. Ayranov</a>, <a href="/search/physics?searchtype=author&query=Bacak%2C+M">M. Bacak</a>, <a href="/search/physics?searchtype=author&query=Barros%2C+S">S. Barros</a>, <a href="/search/physics?searchtype=author&query=Balibrea-Correa%2C+J">J. Balibrea-Correa</a>, <a href="/search/physics?searchtype=author&query=Beecares%2C+V">V. Beecares</a>, <a href="/search/physics?searchtype=author&query=Becvar%2C+F">F. Becvar</a>, <a href="/search/physics?searchtype=author&query=Beinrucker%2C+C">C. Beinrucker</a>, <a href="/search/physics?searchtype=author&query=Berthoumieux%2C+E">E. Berthoumieux</a>, <a href="/search/physics?searchtype=author&query=Billowes%2C+J">J. Billowes</a> , et al. (107 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="1604.00181v1-abstract-short" style="display: inline;"> The newly built second experimental area EAR2 of the n_TOF spallation neutron source at CERN allows to perform (n, charged particles) experiments on short-lived highly radioactive targets. This paper describes a detection apparatus and the experimental procedure for the determination of the cross-section of the 7Be(n,伪) reaction, which represents one of the focal points toward the solution of the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.00181v1-abstract-full').style.display = 'inline'; document.getElementById('1604.00181v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1604.00181v1-abstract-full" style="display: none;"> The newly built second experimental area EAR2 of the n_TOF spallation neutron source at CERN allows to perform (n, charged particles) experiments on short-lived highly radioactive targets. This paper describes a detection apparatus and the experimental procedure for the determination of the cross-section of the 7Be(n,伪) reaction, which represents one of the focal points toward the solution of the cosmological Lithium abundance problem, and whose only measurement, at thermal energy, dates back to 1963. The apparently unsurmountable experimental difficulties stemming from the huge 7Be 纬-activity, along with the lack of a suitable neutron beam facility, had so far prevented further measurements. The detection system is subject to considerable radiation damage, but is capable of disentangling the rare reaction signals from the very high background. This newly developed setup could likely be useful also to study other challenging reactions requiring the detectors to be installed directly in the neutron beam. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.00181v1-abstract-full').style.display = 'none'; document.getElementById('1604.00181v1-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> 1 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">submitted to Nuclear Instruments and Methods in Physics Research A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Instruments and Methods A 830 (2016) 197 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1406.6865">arXiv:1406.6865</a> <span> [<a href="https://arxiv.org/pdf/1406.6865">pdf</a>, <a href="https://arxiv.org/format/1406.6865">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.2014.05.048">10.1016/j.nima.2014.05.048 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> GEANT4 simulation of the neutron background of the C$_6$D$_6$ set-up for capture studies at n_TOF </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=collaboration%2C+n">n_TOF collaboration</a>, <a href="/search/physics?searchtype=author&query=%3A"> :</a>, <a href="/search/physics?searchtype=author&query=%C5%BDugec%2C+P">P. 沤ugec</a>, <a href="/search/physics?searchtype=author&query=Colonna%2C+N">N. Colonna</a>, <a href="/search/physics?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/physics?searchtype=author&query=Altstadt%2C+S">S. Altstadt</a>, <a href="/search/physics?searchtype=author&query=Andrzejewski%2C+J">J. Andrzejewski</a>, <a href="/search/physics?searchtype=author&query=Audouin%2C+L">L. Audouin</a>, <a href="/search/physics?searchtype=author&query=Barbagallo%2C+M">M. Barbagallo</a>, <a href="/search/physics?searchtype=author&query=B%C3%A9cares%2C+V">V. B茅cares</a>, <a href="/search/physics?searchtype=author&query=Be%C4%8Dv%C3%A1%C5%99%2C+F">F. Be膷v谩艡</a>, <a href="/search/physics?searchtype=author&query=Belloni%2C+F">F. Belloni</a>, <a href="/search/physics?searchtype=author&query=Berthoumieux%2C+E">E. Berthoumieux</a>, <a href="/search/physics?searchtype=author&query=Billowes%2C+J">J. Billowes</a>, <a href="/search/physics?searchtype=author&query=Boccone%2C+V">V. Boccone</a>, <a href="/search/physics?searchtype=author&query=Brugger%2C+M">M. Brugger</a>, <a href="/search/physics?searchtype=author&query=Calviani%2C+M">M. Calviani</a>, <a href="/search/physics?searchtype=author&query=Calvi%C3%B1o%2C+F">F. Calvi帽o</a>, <a href="/search/physics?searchtype=author&query=Cano-Ott%2C+D">D. Cano-Ott</a>, <a href="/search/physics?searchtype=author&query=Carrapi%C3%A7o%2C+C">C. Carrapi莽o</a>, <a href="/search/physics?searchtype=author&query=Cerutti%2C+F">F. Cerutti</a>, <a href="/search/physics?searchtype=author&query=Chiaveri%2C+E">E. Chiaveri</a>, <a href="/search/physics?searchtype=author&query=Chin%2C+M">M. Chin</a>, <a href="/search/physics?searchtype=author&query=Cort%C3%A9s%2C+G">G. Cort茅s</a>, <a href="/search/physics?searchtype=author&query=Cort%C3%A9s-Giraldo%2C+M+A">M. A. Cort茅s-Giraldo</a> , et al. (83 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="1406.6865v1-abstract-short" style="display: inline;"> The neutron sensitivity of the C$_6$D$_6$ detector setup used at n_TOF for capture measurements has been studied by means of detailed GEANT4 simulations. A realistic software replica of the entire n_TOF experimental hall, including the neutron beam line, sample, detector supports and the walls of the experimental area has been implemented in the simulations. The simulations have been analyzed in t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.6865v1-abstract-full').style.display = 'inline'; document.getElementById('1406.6865v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1406.6865v1-abstract-full" style="display: none;"> The neutron sensitivity of the C$_6$D$_6$ detector setup used at n_TOF for capture measurements has been studied by means of detailed GEANT4 simulations. A realistic software replica of the entire n_TOF experimental hall, including the neutron beam line, sample, detector supports and the walls of the experimental area has been implemented in the simulations. The simulations have been analyzed in the same manner as experimental data, in particular by applying the Pulse Height Weighting Technique. The simulations have been validated against a measurement of the neutron background performed with a $^\mathrm{nat}$C sample, showing an excellent agreement above 1 keV. At lower energies, an additional component in the measured $^\mathrm{nat}$C yield has been discovered, which prevents the use of $^\mathrm{nat}$C data for neutron background estimates at neutron energies below a few hundred eV. The origin and time structure of the neutron background have been derived from the simulations. Examples of the neutron background for two different samples are demonstrating the important role of accurate simulations of the neutron background in capture cross section measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.6865v1-abstract-full').style.display = 'none'; document.getElementById('1406.6865v1-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 June, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> P. Zugec, N. Colonna, D. Bosnar et al., Nucl. Instrum. Methods A 760, 57 (2014) </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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