【摘要】 13N(p,γ)14O是高温CNO循环中的关键反应,对恒星能量产生机制及其演化的研究具有重要意义。利用北京HI-13串列加速器次级束流线产生的13N放射性束测量了质心系能量为8.9 MeV的13N(d,n)14O反应的角分布,导出了14O基态渐进归一化系数(ANC)为(29.4±5.3)fm-1。此外,使用镜像核的电荷对称性,通过分析13C(d,p)14C反应的角分布,导出了与实验一致的14O基态质子ANC。使用最新开发出的R矩阵程序,导出13N(p,γ)14O反应在高温CNO循环中的天体物理S因子和反应率。将此数据代入核天体物理反应的网络程序进行计算,结果表明,新星中CNO循环产生的能量比原有的结果多5%,这可能会对新星的演化有一定的影响。更多还原

【Abstract】 13N(p,γ)14O is one of the key reaction in hot CNO cycle,which is important for studying the energy source of evolution of stars.The angular distribution of 13N(d,n)14O at E_cm= 8.9 MeV was measured using 13N beam produced by secondary beam facility at HI-13 tandem accelerator.The ANC of 14O was then extracted to be(29.4±5.3) fm-1.In addition,we derived the asymptotic normalization coefficient(ANC) of 14O by analyzing the 13C(d,p)14C angular distribution based on charge symmetry of mirror nuclei,which agrees with the experimental result.The astrophysical S factor and reaction rate of 13N(p,γ)14O were then calculated using R-matrix theory and were inputted into astrophysical reaction network.It shows the energy generated by CNO cycle in novae using the present data is 5% more than that using the previous ones,which could affect the evolution of novae.更多还原