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arXiv 2009.02836nucl-exnucl-th
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在天体物理能量下测量${}^{nat}Pb(p,xn){}^{201-207}Bi$、${}^{204}Pb(p,1-4n){}^{201-204}Bi$和${}^{206}Pb(p,3n){}^{204}Bi$截面($E_p \leq 30 \, MeV$)

Measurements of ${}^{nat}Pb(p,xn){}^{201-207}Bi$, ${}^{204}Pb(p,1-4n){}^{201-204}Bi$ and ${}^{206}Pb(p,3n){}^{204}Bi$ cross-sections at astrophysical energies ($E_p \leq 30 \, MeV$)

P V Guillaumon, I D Goldman, V R Vanin, H Barcellos de Oliveira

摘要:

在天体物理能量范围$20-30 \, MeV$内测定了${}^{nat}Pb(p,xn){}^{201-207}Bi$、${}^{204}Pb(p,1-4n){}^{201-204}Bi$和${}^{206}Pb(p,3n){}^{204}Bi$反应的截面。通过与半衰期测量相关的$γ$光谱进行分析。结果进行了比较,与以前的实验数据,当可用时,并与理论计算使用TPENS代码。我们报告了一个可能的新的$γ$过渡从${}^{204m}{Pb}$和其他理论的差异,可能是由于高估的库仑势垒和中子结合能。还报道了在${}^{205,206}Bi$衰变中发射的$γ$的能量和强度的新测定。我们讨论了超新星和中子星合并中中微子驱动风的r/rp过程的可能影响。

英文摘要:

Cross-sections for ${}^{nat}Pb(p,xn){}^{201-207}Bi$, ${}^{204}Pb(p,1-4n){}^{201-204}Bi$ and ${}^{206}Pb(p,3n){}^{204}Bi$ reactions have been determined in the astrophysical energy range $20-30 \, MeV$. The analysis were performed by $γ$-spectroscopy associated with half-lives measurements. The results were compared with previously experimental data, when available, and with theoretical calculations performed using TALYS code. We report a possible new $γ$ transition from ${}^{204m}{Pb}$ and other theoretical discrepancies, probably due overestimation of the Coulomb barrier and neutron binding energy. Also reported are new determinations of the energies and intensities of the $γ$'s emitted in the decays of ${}^{205,206}Bi$. We discuss possible implications for the r/rp-processes in neutrino-driven wind in supernovae and neutron stars mergers.

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