~(11)C(d,n)~(12)N反应角分布的测量和虚衰变~(12)N→~(11)C+p渐近归一化系数的确定

Measurement of Angular Distribution for ~(11)C(d,n)~(12)N Reaction and Determination of Asymptotic Normalization Coefficient for the Virtual Decay ~(12)N→~(11)C+p

摘要: 利用HI 13串列加速器次级束流线产生的11C束测量了质心系能量为 9.8 MeV的11C(d,n)12N反应的角分布。通过改变DWUCK4程序中径向积分的下限,验证了该反应的周边性。比较了实验结果与扭曲波玻恩近似(DWBA)计算,得出虚衰变12 N→11 C+ p的渐近归一化系数(ANC)平方为(2.86±0.91) fm-1。结果表明:直接俘获对11C(p,γ)12N反应有重要贡献。

Abstract: Angular distribution of the ~(11)C(d,n)~(12)N reaction at E_(c.m.)=9.8 MeV was measured in inverse kinematics with the secondary ~(11)C beam. The peripherality of this reaction was also verified by changing the radial parameter limit in distorted wave Born approximation(DWBA) calculations. The experimental data were analyzed with DWBA calculations and thereby the square of asymptotic normalization coefficient(ANC) was extracted to be (2.86±0.91)fm~(-1) for the virtual decay ~(12)N→~(11)C + p. The present work shows that the direct capture contribution in the ~(11)C(p,γ)~(12)N reaction is of importance.