计算平均中子辐照量新公式的验证

发布时间：2018-02-23 02:24

本文关键词： 平均中子辐照量 AGB星 s-过程核合成　出处：《河北师范大学学报(自然科学版)》2010年05期 　论文类型：期刊论文

【摘要】：最近的研究结果指出,低质量AGB(asymptotic giant branch)星辐射s-过程核合成模型氦壳层核合成区域的中子辐照量分布,同以前的对流核合成模型一样仍然非常接近指数分布;但是每个脉冲的中子辐照量Δτ和平均中子辐照量τ0之间的关系却不再是τ0=-Δτ/lnr,而近似为τ0=-Δτ/ln{q[1.002 0+0.660 2(r-q)+4.612 5(r-q)2-10.896 2(r-q)3+13.913 8(r-q)4]}(r为重叠因子,q为13C壳层占氦壳层的质量比例).利用文献对26颗Ba星以及太阳系s-过程元素观测丰度恒星模型核合成数值计算的拟合结果,以及经典模型的拟合结果,对新关系式进行了检验.结果表明,该关系式对其中的19颗Ba星以及太阳系都是适用的,对于另外7颗Ba星,关系式的失效可从模型参量数值的选择以及2种拟合机制的差异性等方面得到解释.研究结果证明了新关系式的可靠性.
[Abstract]:The recent results show that the neutron radiation dose distribution in the helium shell nuclear synthesis region is still very close to the exponential distribution as in the previous convection nuclear synthesis model of low-mass AGB(asymptotic giant branchs. However, the relationship between the neutron irradiation amount 螖蟿 and the average neutron irradiation amount 蟿 0 of each pulse is no longer 蟿 0n- 螖蟿 / lnrr, but approximately 蟿 0N- 螖蟿 / ln {Q [1.00200.6602nr-q) 4.6125r-qng2-10.896 2r-q3 13.9138r-q4]} r is an overlap factor Q is the mass ratio of 13C shell layer to helium shell. Fitting results of nuclear synthesis numerical calculations for 26 Ba stars and the solar system s-process element observation of abundance star model. And the fitting results of the classical model show that the new relation is applicable to 19 Ba stars and the solar system, and 7 other Ba stars. The failure of the relationship can be explained from the selection of the model parameters and the difference of the two fitting mechanisms. The results of the study prove the reliability of the new relationship.
【作者单位】：沧州师范学院物理与电子信息系;河北师范大学物理科学与信息工程学院;
【基金】：国家自然科学基金(10973006) 河北省自然科学基金(A2009000251) 河北省高校百名优秀创新人才支持计划基金河北师范大学校内重点基金
【分类号】：P142

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