arXiv 1002.09022010-02-04nucl-th

具有轻晕核的电磁过程和弱过程

Electromagnetic and weak processes with light halo nuclei

E. M. Tursunov, D. Baye, P. Descouvemont

备注：: 14 pages, 5 figures

摘要：

用三体模型研究了~ 6 He晕核的β衰变和~ 6Li（0+）激发态到α + d连续谱的M1跃迁过程.在超球坐标系中，初始核态被描述为一个α + 2N系统。最近的实验的每时间和能量单位的β-跃迁概率的能量依赖性和绝对值可以很好地再现与适当的α + d势。得到的总跃迁几率为2.04E ~（-6）s ~（-1），与实验符合。由于矩阵元素的内部分量和晕圈分量的强抵消，晕圈效应被证明是非常重要的。在M1跃迁过程中，证实了6Li（0+）同量异位素类似物激发态的晕结构。然而，抵消效应并不那么强。跃迁几率对α + d相移的描述非常敏感。电荷对称性进行了分析，通过两个过程的比较。目前的分支比Gamma（0^+ --> alpha + d）/Gamma（0^+ --> 1+）的数量级为1.0E-4，预计在当前的实验中可以观察到。

英文摘要：

The beta-decay of the 6He halo nucleus and the M1-transition processes of the excited 6Li(0+) state into the alpha + d continuum are studied in a three-body model. The initial nuclear states are described as an alpha + 2N system in hyperspherical coordinates on a Lagrange mesh. The energy dependence and absolute values of the beta-transition probability per time and energy units of a recent experiment can be reproduced very well with an appropriate alpha + d potential. A total transition probability of 2.04E-6 s^(-1) is obtained in agreement with the experiment. Due to a strong cancellation of the internal and halo components of the matrix elements, halo effects are shown to be very important. For the M1 transition process the halo structure of the excited 6Li(0+) isobaric analog state is confirmed. The cancellation effects, however, are not so strong. The transition probability is strongly sensitive to the description of the alpha + d phase shifts. Charge symmetry is analyzed through a comparison of the two processes. The present branching ratio Gamma(0^+ --> alpha + d)/Gamma(0^+ --> 1+) is of the order 1.0E-4, and is expected to be observable in current experiments.

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摘要：

英文摘要：

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