High-Precision Mass Measurement of Cu56 and the Redirection of the rp -Process Flow
| العنوان: | High-Precision Mass Measurement of Cu56 and the Redirection of the rp -Process Flow |
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| المؤلفون: | M. Eibach, K. Gulyuz, A. C. C. Villari, W.-J. Ong, C. Izzo, Adrian Valverde, D. Puentes, Chandana Sumithrarachchi, A. Hamaker, Ryan Ringle, Maxime Brodeur, Matthew Redshaw, R. Sandler, Georg Bollen, J. Surbrook, Stefan Schwarz, I. T. Yandow |
| المصدر: | Physical Review Letters. 120 |
| بيانات النشر: | American Physical Society (APS), 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Physics, Mass excess, 010308 nuclear & particles physics, General Physics and Astronomy, Penning trap, 01 natural sciences, Mass measurement, p-process, Atomic mass, Superconducting cyclotron, Flow (mathematics), 0103 physical sciences, Atomic physics, 010306 general physics |
| الوصف: | We report the mass measurement of $^{56}\mathrm{Cu}$, using the LEBIT 9.4 T Penning trap mass spectrometer at the National Superconducting Cyclotron Laboratory at Michigan State University. The mass of $^{56}\mathrm{Cu}$ is critical for constraining the reaction rates of the $^{55}\mathrm{Ni}(p,\ensuremath{\gamma})$ $^{56}\mathrm{Cu}(p,\ensuremath{\gamma})$ $^{57}\mathrm{Zn}({\ensuremath{\beta}}^{+})$ $^{57}\mathrm{Cu}$ bypass around the $^{56}\mathrm{Ni}$ waiting point. Previous recommended mass excess values have disagreed by several hundred keV. Our new value, $\mathrm{ME}=\ensuremath{-}38626.7(7.1)\text{ }\text{ }\mathrm{keV}$, is a factor of 30 more precise than the extrapolated value suggested in the 2012 atomic mass evaluation [Chin. Phys. C 36, 1603 (2012)], and more than a factor of 12 more precise than values calculated using local mass extrapolations, while agreeing with the newest 2016 atomic mass evaluation value [Chin. Phys. C 41, 030003 (2017)]. The new experimental average, using our new mass and the value from AME2016, is used to calculate the astrophysical $^{55}\mathrm{Ni}(p,\ensuremath{\gamma})$ and $^{56}\mathrm{Cu}(p,\ensuremath{\gamma})$ forward and reverse rates and perform reaction network calculations of the $rp$ process. These show that the $rp$-process flow redirects around the $^{56}\mathrm{Ni}$ waiting point through the $^{55}\mathrm{Ni}(p,\ensuremath{\gamma})$ route, allowing it to proceed to higher masses more quickly and resulting in a reduction in ashes around this waiting point and an enhancement to higher-mass ashes. |
| تدمد: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.120.032701 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::2b64088dfb60060ddfe7ac949714c3fc https://doi.org/10.1103/physrevlett.120.032701 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........2b64088dfb60060ddfe7ac949714c3fc |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10797114 00319007 |
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| DOI: | 10.1103/physrevlett.120.032701 |