Sensitivity of the r-process to nuclear masses
Sensitivity of the r-process to nuclear masses
复制标题
r 过程对核质量的敏感性
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
A. Aprahamian
中科院分区：
文献类型：
--
作者：
S. Brett;I. Bentley;N. Paul;R. Surman;A. Aprahamian
快中子俘获过程（r-process）被认为是产生铁以外一半以上元素的原因。要了解铁以外的重元素的起源，科学上的挑战既在于允许r过程发生所需的天体物理条件的不确定性，也在于对远离稳定的原子核性质的大量缺乏知识。为了获取和测量现有设备所能达到的最奇特的原子核，全球存在着巨大的竞争，与此同时，建造新的、更强大的加速器来制造更奇特的原子核。这项工作是尝试使用r过程模拟代码和几个质量模型（FRDM， dufl - zuker和HFB-21）来确定最关键的核质量。要测量的最重要的核质量是由r过程丰度的变化决定的。无论使用何种质量模型，N = 50、82和126附近闭合壳层周围的原子核对r-过程丰度的影响最大。
The rapid neutron capture process (r-process) is thought to be responsible for the creation of more than half of all elements beyond iron. The scientific challenges to understanding the origin of the heavy elements beyond iron lie in both the uncertainties associated with astrophysical conditions that are needed to allow an r-process to occur and a vast lack of knowledge about the properties of nuclei far from stability. There is great global competition to access and measure the most exotic nuclei that existing facilities can reach, while simultaneously building new, more powerful accelerators to make even more exotic nuclei. This work is an attempt to determine the most crucial nuclear masses to measure using an r-process simulation code and several mass models (FRDM, Duflo-Zuker, and HFB-21). The most important nuclear masses to measure are determined by the changes in the resulting r-process abundances. Nuclei around the closed shells near N = 50 , 82, and 126 have the largest impact on r-process abundances irrespective of the mass models used.