中性D介子半轻子衰变分支比的理论计算

根据4种将非微扰的强相互作用参数化为形状因子的模型得到的4种强子形状因子,分别计算了中性D介子D^0→K^-e^+ν_e和D^0→π^-e^+ν_e两个半轻子衰变过程的衰变分支比.将计算结果与实验测量值比较,得到极点修正模型对D_0→K^-e^+ν_e过程的理论计算结果中心值与实验测量值非常接近,而对D^0→π^-e^+ν_e过程两参量多级展开模型符合较好.然而由于非微扰效应的存在,形状因子f+(0)和强耦合常数g等参数误差过大,因此得到的理论计算结果误差较大.

Determination Multipole Mixing Ratios and Transition Strengths of Gamma Rays from Level Studies of 93Mo （p, nγ） Reaction

The multipole mixing ratios have been calculated by a2-ratio method, from levels of 93Mo（p, nγ） reaction. The branching ratios of such γ-transitions are used to calculate the total gamma widths. Besides, the transition strengths and probabilities have been calculated for γ-transitions from excited states whose life times have been reported previously. The results are found to be in general in good agreement with the previous results populated from the previous work.