基于(p,γ)-(γ,p)平衡近似的快质子俘获过程模型及其应用  

A model for rp-process within the(p,γ)-(γ,p) equilibrium approximation and its application

作　　者：张珈铭[1,2] 徐晓栋[1] 孙保华[1,3] 

机构地区：[1]北京航空航天大学物理科学与核能工程学院,北京100191 [2]北京师范大学物理学系,北京100875 [3]宇宙中的原子核物理和粒子物理国际研究中心,北京100191

出　　处：《物理学报》2013年第13期186-192,共7页Acta Physica Sinica

基　　金：新世纪优秀人才支持计划(批准号:NCET-09-0031);国家重点基础研究发展计划(973项目)(批准号:2013CB834400);国家自然科学基金(批准号:10975008;11035007;11105010;11128510;11235002);软件开发环境国家重点实验室自主研究课题资助(批准号:SKLSDE-2011ZX-18)资助的课题~~

摘　　要：在(p,γ)-(γ,p)平衡近似下,本文建立了简化的快质子俘获(rp)过程模型,讨论了天体物理条件输入量(即质子辐照时间、质子数密度及温度)对rp过程的影响.结合中国科学院近代物理研究所等时性质谱仪(IMS)上的最新实验数据,本文进而分析了新测的缺中子原子核质量对rp过程的影响;发现利用新测的41Ti质量,A=41处的丰度相较之前的计算结果增大了两个数量级,而计算的相对丰度误差减小了近两个量级.Many of the stable nuclei at the neutron-deficient side of the beta-stability valley cannot be synthesized in the neutron-capture processes. The origin of the so-called p-nuclei has been a long standing question in the nuclear astrophysics. The rapid-proton capture process （rp-process） proposed in the 1980s was one of the possible mechanisms to be responsible for some light p-nuclei. In this work, a model for rapid-proton capture process （rp-process）, within the （P,γ）-（γ,P） equilibrium approximation, is established. In the framework of this model, the influence of astrophysical conditions （i.e., proton number density, temperature, and proton irradiation time） on the rp-abundance pattern is investigated. In addition, the recent-measured mass data of neutron-deficient atomic nuclei by using the storage ring mass spectrometry at IMP, Lanzhou, are employed in our calculation. It is found that the abundance at A = 41 is increased by two orders of magnitude when using the new by determined mass of 41Ti, while the uncertainty of the computed abundance is reduced by almost two orders of magnitude.

关 键 词：快质子俘获过程 (p γ)-(γ p)平衡 原子核质量 缺中子原子核 

分 类 号：O572.341[理学—粒子物理与原子核物理]