恒星内部核素^(56)Fe、^(56)Co、^(56)Ni和^(56)Mn电子俘获过程中微子能量损失高斯修正  

Gaussian Modification of Neutrino Energy Losses on Nuclide ^(56)Fe,^(56)Co,^(56)Ni and ^(56)Mn by Electron Capture in Stellar Interior

作　　者：刘晶晶[1] 罗志全[2] 

机构地区：[1]琼州学院理工学院,三亚572022 [2]西华师范大学理论物理研究所,南充637002

出　　处：《天文学报》2010年第2期144-150,共7页Acta Astronomica Sinica

基　　金：海南省自然科学基金(109004);海南省教育厅高校科研基金(Hjkj2010-42);三亚市高等院校专项基金(YD09047);国家自然科学基金(10778719)资助项目

摘　　要：采用高斯修正法,研究了核素^(56)Fe、^(56)Co、^(56)Ni和^(56)Mn电子俘获过程中微子能量损失.结果表明:对核素的Gamow-Teller(G-T)共振跃迁能级分布的高斯修正使中微子能量损失率增加.在低能跃迁电子俘获过程为主导地位的反应中,高斯修正对中微子能量损失的影响很小,而对高能G-T共振跃迁为主要的电子俘获过程的中微子能量损失的影响将大大增加.如核素^(56)Fe在密度ρ_7=100(ρ_7以10~7 mol·cm^(-3)为单位),高斯函数半宽度△=14.3,18.3,22.3 Mev时,修正差异大约达2个数量级,核素^(56)Ni在△=6.3,18.3Mev差异分别达60%和40%.By the method of Gaussian Modification, the neutrino energy losses of nuclide 56Fe,56Co,56Ni and 56Mn by electron capture are investigated in stellar interior. The results show that the neutrino energy loss rates will be increased due to the Gaussian Modification of strength distribution on Gamow-Teller （GT） transition. The Gaussian Modification has only a slight effect on the neutrino energy loss rates when the electron capture reaction is dominated by lower energy transition. However, the neutrino energy loss rates will be greatly increased when the electron capture reaction is dominated by higher energy GT res- onance transition. For example, the correctional differences of neutrino energy loss rates of nuclide 56Fe are about 2 orders of magnitude when ρ7 = 100 （ρ7 is in units of 10^7 mol. cm^ ）those of nuclide 56Ni are about 60% and 40% when P7 = 100 and △ =6.3, 18.3 Mev.and half-width of Gaussian function △ =14.3, 18.3, 22.3 Mev.

关 键 词：恒星 演化 恒星 内部 中微子 

分 类 号：P144[天文地球—天体物理]