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 ($E_p\le 30MeV$)

Abstract

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 $20-30MeV$. The analysis were performed by $\gamma$-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 $\gamma$ 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 $\gamma$'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.