s过程相关的核天体物理实验研究

本项目基于15MeV电子直线加速器驱动的白光中子源装置，组建多单元伽马探测器阵列，研究中子相关的核天体物理俘获截面，特别是s过程中的关键重元素的俘获截面，如79Se(n,gamma)，85Kr(n,gamma)等衰变分支核及相关核素的俘获截面研究。他们是核反应路径上关键的核素，其俘获截面和贝塔衰变几率将会决定反应路径的走向，成为关键分支点（branching point）；通过对这些核素俘获截面的研究，提供核天体物理所需的关键核物理参数(中子能量0.3-300keV,对应宇宙温度kT=8-90keV)，对于深入了解太阳系重元素丰度的起源，了解宇宙的演化及核合成过程具有重要的意义。

Based on the white neutron source drived by 15MeV electron LINAC, and a multi gamma detector array, to study the neutron capture cross section in nuclear astrophysics,especialy 79Se(n,gamma), 85Kr(n,gamma)brancing point nuclei and related nuclei's neutron capture reactions in s-process nucleosynthesis.Important nuclear physics parameters for s-process nucleosynthesis are neutron capture cross section and beta decay, neutron energy is En=0.3-300keV,corresponding to stellar tempture between kT=8-90keV,in this region, neutrons play a crucial role in astrophysics during the heavy element nucleosynthesis，so it's very important.