arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.05263nucl-th
收藏

轻核弱跃迁的手征有效场论计算

Chiral Effective Field Theory Calculations of Weak Transitions in Light Nuclei

G. B. King, L. Andreoli, S. Pastore, M. Piarulli, R. Schiavilla, R. B. Wiringa, J. Carlson, S. Gandolfi

摘要:

本文报道了基于Norfolk双核子和三体手征相互作用以及相应的一体和两体轴流的$A\leq 10$核弱跃迁的量子蒙特卡罗计算。我们发现,从两体电流的贡献是在$2$ - $3\%$水平,与矩阵元素进入率的$^8$李,$^8$ B,和$^8$他β衰变除外。这些矩阵元素被抑制在脉冲近似的基础上(领先的顺序)伽莫夫泰勒过渡算子单独的两体电流提供$20$ - $30\%$校正,这是,但是,不足以使理论与实验数据一致。对于其他过渡,与数据的协议是令人满意的,结果表现出可忽略不计的轻度模型依赖时,不同组合的诺福克相互作用被用来构建核波函数。我们报告了一个完整的研究两体弱跃迁密度,揭示了预期的普遍行为的两体电流在短距离的整个范围内的$A\,$ = $\,3$ $A\,$ = $\,10$系统在这里考虑。

英文摘要:

We report Quantum Monte Carlo calculations of weak transitions in $A\leq 10$ nuclei, based on the Norfolk two- and three-nucleon chiral interactions, and associated one- and two-body axial currents. We find that the contribution from two-body currents is at the $2$ - $3\%$ level, with the exception of matrix elements entering the rates of $^8$Li, $^8$B, and $^8$He beta decays. These matrix elements are suppressed in impulse approximation based on the (leading order) Gamow Teller transition operator alone; two-body currents provide a $20$ - $30\%$ correction, which is, however, insufficient to bring theory in agreement with experimental data. For the other transitions, the agreement with the data is satisfactory, and the results exhibit a negligible to mild model dependence when different combinations of Norfolk interactions are utilized to construct the nuclear wave functions. We report a complete study of two-body weak transition densities which reveals the expected universal behavior of two-body currents at short distances throughout the range of $A\,$=$\,3$ to $A\,$=$\,10$ systems considered here.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑