تقرير
Unblocking of stellar electron capture for neutron-rich $N=50$ nuclei at finite temperature
| العنوان: | Unblocking of stellar electron capture for neutron-rich $N=50$ nuclei at finite temperature |
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| المؤلفون: | Dzhioev, Alan A., Langanke, K., Martínez-Pinedo, G., Vdovin, A. I., Stoyanov, Ch. |
| المصدر: | Phys. Rev. C 101, 025805 (2020) |
| سنة النشر: | 2019 |
| المجموعة: | Nuclear Theory |
| مصطلحات موضوعية: | Nuclear Theory |
| الوصف: | We have calculated electron capture rates for neutron-rich $N=50$ nuclei ($^{78}$Ni, $^{82}$Ge, $^{86}$Kr, $^{88}$Sr) within the Thermal QRPA approach at temperatures $T=0$, corresponding to capture on the ground-state, and at $T=10$ GK (0.86 MeV), which is a typical temperature at which the $N=50$ nuclei are abundant during a supernova collapse. In agreement with recent experiments, we find no Gamow-Teller (GT$_+$) strength at low excitation energies, $E<7$ MeV, caused by Pauli blocking induced by the $N=50$ shell gap. At the astrophysically relevant temperatures this Pauli blocking of the GT$_+$ strength is overcome by thermal excitations across the $Z=40$ proton and $N=50$ neutron shell gaps, leading to a sizable GT contribution to the electron capture. At the high densities, at which the $N=50$ nuclei are important for stellar electron capture, forbidden transitions contribute noticeably to the capture rate. Our results indicate that the neutron-rich $N=50$ nuclei do not serve as an obstacle of electron capture during the supernova collapse. Comment: Published version |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevC.101.025805 |
| URL الوصول: | http://arxiv.org/abs/1910.03335 |
| رقم الأكسشن: | edsarx.1910.03335 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevC.101.025805 |
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