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

• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2020,（7）
• 页码范围: 80-86
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1137/44/7/074001

摘要

The radionuclide 22Na generates the emission of a characteristic 1.275 MeV γ-ray.This is a potential astronomical observable,whose occurrence is suspected in classical novae.The 22Mg(p,γ)23A1 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) for the virtual decay of 23Ne → 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 Cd25/2(23A1) =(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 23A1.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.