【摘 要】
：
The neutron-capture process is traditionally postulated to be responsible for the nucleosynthesis of heavy elements beyond Fe.Based on theleast squares method a
【机 构】
：
1 National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 65001
论文部分内容阅读
The neutron-capture process is traditionally postulated to be responsible for the nucleosynthesis of heavy elements beyond Fe.Based on theleast squares method and solar isotopic abundances from the classical model,we estimate the relative contributions of the s- and r-processes to the abundance of neutron-capture elements in the metalpoor star HD 175305 from the component coefficients.Applying the calculated component coefficients Cr and Cs,the model predicts the isotopic fractions of elements Nd,Sm and Eu to be f142+144 =0.482,f152+154 =0.525 and fl51 =0.450,respectively.As well as the observed abundances,the isotropic fractions are also consistent with the calculations.Finally,for the first time,we estimated the contribution percentage of the two neutron processes (the r- and s-processes) from the observed isotopic fractions of different elements in HD 175305,e.g.an r-process contribution of 67％+21％-32％ from the 4604 (A) line of Sm.
其他文献
We report the ab initio calculations of transport behaviors of an azobenzene molecular device which is similar to the experimental configurations.The calculated
Exact solutions of the Dirac equation are studied for the pseudo-harmonic oscillatory ring-shaped potential by using the Laplace transform approach and the Niki
The electronic properties of 3C-SiC doped with different contents of Ni are investigated by using first-principles calculations.It is observed that the non-fill
在工程设计中,常遇到连续变量和离散变量同时存在的错综复杂问题。人们尝试过采用经典的数学解析和最优化理论来解决这类问题,然而均难以取得圆满结果;而采用离散变量处理方
We try to find the analytical solutions to the time-independent Gross-Pitaevskii equation,a nonlinear Schr(o)dinger equation used in the simulation of Bose-Eins
长期股权投资中暂时性差异的产生源于采用了权益的核算.对于产生的暂时性差异是否确认,需要根据管理者的投资意图来判断与处理.本文对长期股权投资权益法核算下,暂时性差异的
生活即教育,有什么样的生活就有什么样的教育,网络时代的生活必然有网络时代的教育。学生在享受网络带来的便捷的同时,各种各样的网络道德问题也接踵而来,使部分学生步入网络
We report 1 × 4 optical splitters (OSs) with different splitting ratios based on either rod-type or hole-type silicon photonic crystal seff-collimation ring re
An atmospheric cold plasma brush suitable for large area and low-temperature plasma-based sterilization is designed and used to treat enterococcus faecalis bact
古诗词之妙在于它不仅是一段精彩的描述,而且是一幅令人回味的图画、一篇优美动听的乐章.诗词是有画面、有意境、有情感的,就像人教版四年级下册第六单元张志和所作的词《渔