天体物理中爆发性核合成(英文)  

Explosive Nucleosynthesis in Astrophysics

作　　者：陈永寿[1] 舒能川[1] 吴开谡[1] 

机构地区：[1]中国原子能科学研究院

出　　处：《高能物理与核物理》2004年第12期1349-1355,共7页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 (1993 5 0 3 0 ,10 0 75 0 78,10 0 470 0 1);国家重点基础研究发展规划 (G2 0 0 0 0 774)资助~~

摘　　要：简要地评述天体核过程 ,着重讨论爆发性氢燃烧过程 ,并利用最新的反应率实验数据对氢燃烧过程进行了计算 .指出从热pp链通过11C的质子辐射俘获反应进入CNO循环的反应流量可以超过 3α过程的流量 .用18F(p ,γ)和 (p ,α)反应的新反应率计算的18F生成丰度比旧反应率给出的丰度要大 1.8倍 .对在X射线爆的典型天体物理条件下的快质子 (rp)过程的计算表明 ,“等待核”89Ru和93Pd的 β衰变寿命的新实验数据给出的该 2核的生成丰度 ,比旧实验数据给出的值要大 4倍 .The nuclear processes in astrophysics are briefly reviewed, and the explosive hydrogen burning are addressed and calculated with some new reaction rates obtained from the most recent experimental data. We pointed out that the reaction flux from the hot pp-chain into the CNO cycle through the proton capture on 11C may overcome the flux through the 3α process. The abundance of 18F calculated with the new rates of the 18F(p, γ) and (p,α) is 1.8 times larger than the previous one. The calculated results of the rp-process at the typical condition of the X-ray burst show that the abundances of the waiting point nuclei 89Ru and 93Pd, using the recent experimental β-decay life times, are about 4 times larger than the previous ones.

关 键 词：天体物理 核合成 丰度 俘获反应 CNO循环 Β衰变 计算表 实验数据 反应率 快质子 

分 类 号：O571[理学—粒子物理与原子核物理]