Astrophysical 22Mg(p,γ)23Al reaction rates from asymptotic normalization coefficient of 23Ne→22Ne+n  

作　　者：Xin-Yue Li Bing Guo Zhi-Hong Li Wei-Ping Liu 李鑫悦;郭冰;李志宏;柳卫平(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]China Institute of Atomic Energy,Beijing 102413,China

出　　处：《Chinese Physics C》2020年第7期80-86,共7页中国物理C（英文版）

基　　金：Supported by the National Key Research and Development Program of China(2016YFA0400502);the National Natural Science Foundation of China(11975316,11490561,11535004,11775013);the Continuous Basic Scientific Research Project(WDJC-2019-13);the 973 Program(2013CB834406)。

摘　　要：The radionuclide 22Na generates the emission of a characteristic 1.275 MeVγ-ray.This is a potential astronomical observable,whose occurrence is suspected in classical novae.The 22Mg(p,γ)23Al reaction is relevant to the nucleosynthesis of 22Na in Ne-rich novae.In this study,employing the adiabatic distorted wave approximation and continuum discretized coupled channel methods,the squared neutron asymptotic normalization coefficients(ANCs)231 for the virtual decay of Ne→22Ne+n were extracted,and determined as(0.483±0.060)fm-1 and(9.7±2.3)fm-1 for the ground state and the first excited state from the experimental angular distributions of 22Ne(d,p)23Ne populating the ground state and the first excited state of 23Ne,respectively.Then,the squared proton ANC of 23Alg.s.was obtained as Cd5/22(23Al)(2.65±0.33)×103 fm-1 according to the charge symmetry of the strong interaction.The astrophysical S-factors and reaction rates for the direct capture contribution in 22Mg(p,γ)23Al were also presented.Furthermore,the proton width of the first excited state of 23Al was derived to be(57±14)eV from the neutron ANC of its mirror state in 23Ne and used to compute the contribution from the first resonance of 23Al.This result demonstrates that the direct capture dominates the 22Mg(p,γ)23Al reaction at most temperatures of astrophysical relevance for 0.33<T9<0.64.

关 键 词：classical nova transfer reaction asymptotic normalization coefficient radiative capture 

分 类 号：P14[天文地球—天体物理]