论文标题
深层实验室测量$^{13} $ c（$α$，$ n $）$^{16} $ o在$ s $的游戏窗口中 - 和$ i $ - 程序
Deep underground laboratory measurement of $^{13}$C($α$,$n$)$^{16}$O in the Gamow windows of the $s$- and $i$-processes
论文作者
论文摘要
$^{13} $ c（$α$，$ n $）$^{16} $ o反应是渐近巨型分支星星和中间（i-）过程中慢速内部捕获（S-）过程的主要中子源。在地上实验室中的天体物理能量的直接测量受到了极小的横截面和巨大的宇宙射线感应背景的阻碍。我们在$ e _ {\ rm c.m。} = $ 0.24 MEV至1.9 MEV的范围内进行了第一个一致的直接测量，并使用中国jinping Underground Laboratory（CJPL）和四川大学的加速器进行了直接测量。 Our measurement covers almost the entire i-process Gamow window in which the large uncertainty of the previous experiments has been reduced from 60\% down to 15\%, eliminates the large systematic uncertainty in the extrapolation arising from the inconsistency of existing data sets, and provides a more reliable reaction rate for the studies of the s- and i-processes along with the first direct determination of the alpha strength for the near-threshold state.
The $^{13}$C($α$,$n$)$^{16}$O reaction is the main neutron source for the slow-neutron-capture (s-) process in Asymptotic Giant Branch stars and for the intermediate (i-) process. Direct measurements at astrophysical energies in above-ground laboratories are hindered by the extremely small cross sections and vast cosmic-ray induced background. We performed the first consistent direct measurement in the range of $E_{\rm c.m.}=$0.24 MeV to 1.9 MeV using the accelerators at the China Jinping Underground Laboratory (CJPL) and Sichuan University. Our measurement covers almost the entire i-process Gamow window in which the large uncertainty of the previous experiments has been reduced from 60\% down to 15\%, eliminates the large systematic uncertainty in the extrapolation arising from the inconsistency of existing data sets, and provides a more reliable reaction rate for the studies of the s- and i-processes along with the first direct determination of the alpha strength for the near-threshold state.
