标题： $^{83}$Rb(p,$γ)^{84}$Sr 和$^{84}$Kr(p,$γ)^{85}$Rb 反应在天体物理$γ$过程特征能量下的截面 显示英文标题

标题： Cross Sections of the $^{83}$Rb(p,$γ)^{84}$Sr and $^{84}$Kr(p,$γ)^{85}$Rb Reactions at Energies Characteristic of the Astrophysical $γ$ Process

摘要： 我们测量了在反动核物理中使用放射性束$^{83}$Rb 在入射能量为 2.4 和$2.7 A$MeV 时$^{83}$Rb(p,$\gamma)^{84}$Sr 辐射俘获反应的截面。 在放射性束测量之前，使用稳定的 $^{84}$Kr 束在入射能量为 $2.7 A$ MeV 的条件下，通过逆动量方式测量了 $^{84}$Kr(p,$\gamma)^{85}$Rb 辐射俘获反应。 这些测量的有效相对动能位于超新星中 $\gamma$过程的相关能量窗口内。 两种反应的测量部分截面的中心值被发现是统计模型计算预测值的 $0.17-0.42$倍。 假设其他能量下的预测截面以相同因子减少，会导致 $p$ 核素 $^{84}$Sr 的计算丰度略有增加，这是由于目前测量得到的 $^{84}$Sr($\gamma$,p)$^{83}$Rb 反应速率降低所致。 显示英文摘要

摘要： We have measured the cross section of the $^{83}$Rb(p,$\gamma)^{84}$Sr radiative capture reaction in inverse kinematics using a radioactive beam of $^{83}$Rb at incident energies of 2.4 and $2.7 A$ MeV. Prior to the radioactive beam measurement, the $^{84}$Kr(p,$\gamma)^{85}$Rb radiative capture reaction was measured in inverse kinematics using a stable beam of $^{84}$Kr at an incident energy of $2.7 A$ MeV. The effective relative kinetic energies of these measurements lie within the relevant energy window for the $\gamma$ process in supernovae. The central values of the measured partial cross sections of both reactions were found to be $0.17-0.42$ times the predictions of statistical model calculations. Assuming the predicted cross section at other energies is reduced by the same factor leads to a slightly higher calculated abundance of the $p$ nucleus $^{84}$Sr, caused by the reduced rate of the $^{84}$Sr($\gamma$,p)$^{83}$Rb reaction derived from the present measurement.