2-10 Direct Measurement of the Main s-process Neutron Source  

作　　者：Tang Xiaodong Ren Jie Chen Han Chen Zhijun Chen Xiongjun Huang Hanxiong Jiang Liyang Li Kuoang Ruan Xuchao Wang Shuo Zhang Ningtao the JUNA collaboration 

机构地区：[1]不详 [2]China Institute of Atomic Energy, Beijing 102413, China [3]Department of Physics, Shandong University, Weihai, Shandong, China

出　　处：《IMP & HIRFL Annual Report》2014年第1期41-42,共2页中国科学院近代物理研究所和兰州重离子研究装置年报（英文版）

摘　　要：The 13C(, n)16O reaction is the key neutron source reaction for the main s-process nucleosynthesis[1]. Theimportant energy range (Gamow window) for the 13C( , n)16O reaction during the s-process spans from 140 to230 keV in the center of mass frame. Because of the Coulomb barrier, the cross sections drop exponentially asmeasurement approaches the Gamow window energies. Limited by cosmic ray background and the available beamintensity, the ground-based measurements are limited to energies above 280 keV. Therefore, the extrapolationbased on R-matrix calculation and/or in-direct measurement is the current method to estimate the cross sectionsfor astrophysical interest with limited precision. Moreover, due to the existence of sub-threshold resonances, thereare rather large uncertainties associated with the extrapolated cross sections which limit the precision of the currentreaction rate and thus prevent us from a complete understanding of the nucleosynthesis of heavy elements.

关 键 词：DIRECT MEASUREMENT NEUTRON 

分 类 号：O4[理学—物理]