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<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/2412.01723">arXiv:2412.01723</a> <span> [<a href="https://arxiv.org/pdf/2412.01723">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</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/s41467-024-54040-4">10.1038/s41467-024-54040-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Enhanced production of 60Fe in massive stars </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a>, <a href="/search/nucl-ex?searchtype=author&query=Richman%2C+D">D. Richman</a>, <a href="/search/nucl-ex?searchtype=author&query=Couture%2C+A">A. Couture</a>, <a href="/search/nucl-ex?searchtype=author&query=Fields%2C+C+E">C. E. Fields</a>, <a href="/search/nucl-ex?searchtype=author&query=Liddick%2C+S+N">S. N. Liddick</a>, <a href="/search/nucl-ex?searchtype=author&query=Childers%2C+K">K. Childers</a>, <a href="/search/nucl-ex?searchtype=author&query=Crider%2C+B+P">B. P. Crider</a>, <a href="/search/nucl-ex?searchtype=author&query=DeYoung%2C+P+A">P. A. DeYoung</a>, <a href="/search/nucl-ex?searchtype=author&query=Dombos%2C+A+C">A. C. Dombos</a>, <a href="/search/nucl-ex?searchtype=author&query=Gastis%2C+P">P. Gastis</a>, <a href="/search/nucl-ex?searchtype=author&query=Guttormsen%2C+M">M. Guttormsen</a>, <a href="/search/nucl-ex?searchtype=author&query=Hermansen%2C+K">K. Hermansen</a>, <a href="/search/nucl-ex?searchtype=author&query=Larsen%2C+A+C">A. C. Larsen</a>, <a href="/search/nucl-ex?searchtype=author&query=Lewis%2C+R">R. Lewis</a>, <a href="/search/nucl-ex?searchtype=author&query=Lyons%2C+S">S. Lyons</a>, <a href="/search/nucl-ex?searchtype=author&query=Midtb%C3%B8%2C+J+E">J. E. Midtb酶</a>, <a href="/search/nucl-ex?searchtype=author&query=Mosby%2C+S">S. Mosby</a>, <a href="/search/nucl-ex?searchtype=author&query=Muecher%2C+D">D. Muecher</a>, <a href="/search/nucl-ex?searchtype=author&query=Naqvi%2C+F">F. Naqvi</a>, <a href="/search/nucl-ex?searchtype=author&query=Palmisano-Kyle%2C+A">A. Palmisano-Kyle</a>, <a href="/search/nucl-ex?searchtype=author&query=Perdikakis%2C+G">G. Perdikakis</a>, <a href="/search/nucl-ex?searchtype=author&query=Prokop%2C+C">C. Prokop</a>, <a href="/search/nucl-ex?searchtype=author&query=Schatz%2C+H">H. Schatz</a>, <a href="/search/nucl-ex?searchtype=author&query=Smith%2C+M+K">M. K. Smith</a>, <a href="/search/nucl-ex?searchtype=author&query=Sumithrarachchi%2C+C">C. Sumithrarachchi</a> , et al. (1 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="2412.01723v1-abstract-short" style="display: inline;"> Massive stars are a major source of chemical elements in the cosmos, ejecting freshly produced nuclei through winds and core-collapse supernova explosions into the interstellar medium. Among the material ejected, long lived radioisotopes, such as 60Fe (iron) and 26Al (aluminum), offer unique signs of active nucleosynthesis in our galaxy. There is a long-standing discrepancy between the observed 60… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.01723v1-abstract-full').style.display = 'inline'; document.getElementById('2412.01723v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.01723v1-abstract-full" style="display: none;"> Massive stars are a major source of chemical elements in the cosmos, ejecting freshly produced nuclei through winds and core-collapse supernova explosions into the interstellar medium. Among the material ejected, long lived radioisotopes, such as 60Fe (iron) and 26Al (aluminum), offer unique signs of active nucleosynthesis in our galaxy. There is a long-standing discrepancy between the observed 60Fe/26Al ratio by 纬-ray telescopes and predictions from supernova models. This discrepancy has been attributed to uncertainties in the nuclear reaction networks producing 60Fe, and one reaction in particular, the neutron-capture on 59Fe. Here we present experimental results that provide a strong constraint on this reaction. We use these results to show that the production of 60Fe in massive stars is higher than previously thought, further increasing the discrepancy between observed and predicted 60Fe/26Al ratios. The persisting discrepancy can therefore not be attributed to nuclear uncertainties, and points to issues in massive-star models. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.01723v1-abstract-full').style.display = 'none'; document.getElementById('2412.01723v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Communications ( 2024) 15:9608 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2101.03664">arXiv:2101.03664</a> <span> [<a href="https://arxiv.org/pdf/2101.03664">pdf</a>, <a href="https://arxiv.org/format/2101.03664">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.125.262701">10.1103/PhysRevLett.125.262701 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> $尾$-decay of $^{61}$V and its Role in Cooling Accreted Neutron Star Crusts </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Ong%2C+W+-">W. -J. Ong</a>, <a href="/search/nucl-ex?searchtype=author&query=Brown%2C+E+F">E. F. Brown</a>, <a href="/search/nucl-ex?searchtype=author&query=Browne%2C+J">J. Browne</a>, <a href="/search/nucl-ex?searchtype=author&query=Ahn%2C+S">S. Ahn</a>, <a href="/search/nucl-ex?searchtype=author&query=Childers%2C+K">K. Childers</a>, <a href="/search/nucl-ex?searchtype=author&query=Crider%2C+B+P">B. P. Crider</a>, <a href="/search/nucl-ex?searchtype=author&query=Dombos%2C+A+C">A. C. Dombos</a>, <a href="/search/nucl-ex?searchtype=author&query=Gupta%2C+S+S">S. S. Gupta</a>, <a href="/search/nucl-ex?searchtype=author&query=Hitt%2C+G+W">G. W. Hitt</a>, <a href="/search/nucl-ex?searchtype=author&query=Langer%2C+C">C. Langer</a>, <a href="/search/nucl-ex?searchtype=author&query=Lewis%2C+R">R. Lewis</a>, <a href="/search/nucl-ex?searchtype=author&query=Liddick%2C+S+N">S. N. Liddick</a>, <a href="/search/nucl-ex?searchtype=author&query=Lyons%2C+S">S. Lyons</a>, <a href="/search/nucl-ex?searchtype=author&query=Meisel%2C+Z">Z. Meisel</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%B6ller%2C+P">P. M枚ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Montes%2C+F">F. Montes</a>, <a href="/search/nucl-ex?searchtype=author&query=Naqvi%2C+F">F. Naqvi</a>, <a href="/search/nucl-ex?searchtype=author&query=Pereira%2C+J">J. Pereira</a>, <a href="/search/nucl-ex?searchtype=author&query=Prokop%2C+C">C. Prokop</a>, <a href="/search/nucl-ex?searchtype=author&query=Richman%2C+D">D. Richman</a>, <a href="/search/nucl-ex?searchtype=author&query=Schatz%2C+H">H. Schatz</a>, <a href="/search/nucl-ex?searchtype=author&query=Schmidt%2C+K">K. Schmidt</a>, <a href="/search/nucl-ex?searchtype=author&query=Spyrou%2C+A">A. Spyrou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2101.03664v1-abstract-short" style="display: inline;"> The interpretation of observations of cooling neutron star crusts in quasi-persistent X-ray transients is affected by predictions of the strength of neutrino cooling via crust Urca processes. The strength of crust Urca neutrino cooling depends sensitively on the electron-capture and $尾$-decay ground-state to ground-state transition strengths of neutron-rich rare isotopes. Nuclei with mass number… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.03664v1-abstract-full').style.display = 'inline'; document.getElementById('2101.03664v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2101.03664v1-abstract-full" style="display: none;"> The interpretation of observations of cooling neutron star crusts in quasi-persistent X-ray transients is affected by predictions of the strength of neutrino cooling via crust Urca processes. The strength of crust Urca neutrino cooling depends sensitively on the electron-capture and $尾$-decay ground-state to ground-state transition strengths of neutron-rich rare isotopes. Nuclei with mass number $A=61$ are predicted to be among the most abundant in accreted crusts, and the last remaining experimentally undetermined ground-state to ground-state transition strength was the $尾$-decay of $^{61}$V. This work reports the first experimental determination of this transition strength, a ground-state branching of 8.1$^{+2.2}_{-2.0} \%$, corresponding to a log $ft$ value of 5.5$^{+0.2}_{-0.2}$. This result was achieved through the measurement of the $尾$-delayed $纬$ rays using the total absorption spectrometer SuN and the measurement of the $尾$-delayed neutron branch using the neutron long counter system NERO at the National Superconducting Cyclotron Laboratory at Michigan State University. This method helps to mitigate the impact of the Pandemonium effect in extremely neutron-rich nuclei on experimental results. The result implies that $A=61$ nuclei do not provide the strongest cooling in accreted neutron star crusts as expected by some predictions, but that their cooling is still larger compared to most other mass numbers. Only nuclei with mass numbers 31, 33, and 55 are predicted to be cooling more strongly. However, the theoretical predictions for the transition strengths of these nuclei are not consistently accurate enough to draw conclusions on crust cooling. With the experimental approach developed in this work all relevant transitions are within reach to be studied in the future. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.03664v1-abstract-full').style.display = 'none'; document.getElementById('2101.03664v1-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 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures Copyright by APS Link to publication: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.262701</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 125 (2020) 262701 published December 28, 2020 </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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