The $\ensuremath{\gamma}$ process is an explosive astrophysical scenario, which is thought to be the primary source of the rare proton-rich stable $p$ nuclei. However, current $\ensuremath{\gamma}$-process models remain insufficient in describing the observed $p$-nuclei abundances, with disagreements up to two orders of magnitude. A sensitivity study has identified ${}^{111}\mathrm{In}$ as a model-sensitive $(\ensuremath{\gamma},p)/(\ensuremath{\gamma},n)$ branching point within the $\ensuremath{\gamma}$ process. Constraining the involved reaction rates may have a significant impact on the predicted $p$-nuclei abundances. Here we report on measurements of the cross sections for $^{102}\mathrm{Pd}(p,\ensuremath{\gamma})\phantom{\rule{0.16em}{0ex}}^{103}\mathrm{Ag},\phantom{\rule{0.28em}{0ex}}^{108}\mathrm{Cd}(p,\ensuremath{\gamma})\phantom{\rule{0.16em}{0ex}}^{109}\mathrm{In}$, and $^{110}\mathrm{Cd}(p,\ensuremath{\gamma})\phantom{\rule{0.16em}{0ex}}^{111}\mathrm{In}$ reactions for proton laboratory energies 3--8 MeV using the high efficiency total absorption spectrometer and the $\ensuremath{\gamma}$-summing technique. These measurements were used to constrain Hauser-Feshbach parameters used in talys 1.9, which constrains the $^{111}\mathrm{In}(\ensuremath{\gamma},p)\phantom{\rule{0.16em}{0ex}}^{110}\mathrm{Cd}$ and $^{111}\mathrm{In}(\ensuremath{\gamma},n)\phantom{\rule{0.16em}{0ex}}^{110}\mathrm{Ag}$ reaction rates. The newly constrained reaction rates indicate that the $^{111}\mathrm{In}\phantom{\rule{4pt}{0ex}}(\ensuremath{\gamma},p)/(\ensuremath{\gamma},n)$ branching point occurs at a temperature of $2.71\ifmmode\pm\else\textpm\fi{}0.05\phantom{\rule{0.28em}{0ex}}\mathrm{GK}$, well within the temperature range relevant to the $\ensuremath{\gamma}$ process. These findings differ significantly from previous studies and may impact the calculated abundances.

中文翻译：

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A=100–110 质量区域中质子捕获的测量：与 γ 过程相关的 In111(γ,p)/(γ,n) 分支点的约束

$\ensuremath{\gamma}$ 过程是一个爆炸性的天体物理场景，被认为是稀有的富含质子的稳定 $p$ 原子核的主要来源。然而，当前的 $\ensuremath{\gamma}$-process 模型在描述观察到的 $p$-核丰度方面仍然不足，分歧高达两个数量级。一项敏感性研究已将 ${}^{111}\mathrm{In}$ 确定为模型敏感的 $(\ensuremath{\gamma},p)/(\ensuremath{\gamma},n)$ 分支点$\ensuremath{\gamma}$ 过程。限制所涉及的反应速率可能会对预测的 $p$-核丰度产生重大影响。在这里，我们报告了 $^{102}\mathrm{Pd}(p,\ensuremath{\gamma})\phantom{\rule{0.16em}{0ex}}^{103}\mathrm{ 横截面的测量结果Ag},\phantom{\rule{0.28em}{0ex}}^{108}\mathrm{Cd}(p,\ensuremath{\gamma})\phantom{\rule{0. 16em}{0ex}}^{109}\mathrm{In}$ 和 $^{110}\mathrm{Cd}(p,\ensuremath{\gamma})\phantom{\rule{0.16em}{0ex} }^{111}\mathrm{In}$ 使用高效总吸收光谱仪和 $\ensuremath{\gamma}$ 求和技术对质子实验室能量 3--8 MeV 的反应。这些测量用于约束 talys 1.9 中使用的 Hauser-Feshbach 参数，该参数约束 $^{111}\mathrm{In}(\ensuremath{\gamma},p)\phantom{\rule{0.16em}{0ex} }^{110}\mathrm{Cd}$ 和 $^{111}\mathrm{In}(\ensuremath{\gamma},n)\phantom{\rule{0.16em}{0ex}}^{110}\ mathrm{Ag}$ 反应率。新约束的反应速率表明 $^{111}\mathrm{In}\phantom{\rule{4pt}{0ex}}(\ensuremath{\gamma},p)/(\ensuremath{\gamma},n )$ 分支点出现在 $2.71\ifmmode\pm\else\textpm\fi{}0.05\phantom{\rule{0.28em}{0ex}}\mathrm{GK}$, 在与 $\ensuremath{\gamma}$ 过程相关的温度范围内。这些发现与之前的研究有很大不同，可能会影响计算的丰度。