共轭核(N=Z)低激发谱特征的微观相互作用玻色子模型研究

Spectrum characteristics on conjugate nuclear(N = Z)at low excited states under microscopic interacting boson model

在唯象和微观玻色子相互作用模型（IBM）中,由于存在中子-质子自由度,它们对激发能的相对贡献率始终没有研究清楚.本研究提出：假定处在同一大壳层上中子数和质子数相等（N=Z）的共轭核中,它们对低激发态应该贡献出相等的激发能,这就绕开了对它们能量分摊评估的一大难题.本文采用28~50核子大壳层的实验能级值,对6个偶-偶核,64 Ge6832,Se34,72 Kr7636,Sr38,80Zr40和84 Mo42,的低激发能谱作了理论计算,计算能谱很好地再现了复杂的实验测量谱,支持上述推测.据此得到的能级值,中子-质子间等效相互作用强度参数等可以作为进一步研究的起点.

In the phenomenological and microscopic boson interaction （IBM）, the relative contribution rate of the neutron-proton excitation energy has not been studied clearly because of the existence of their degrees of freedom. This study proposes： if some nuclear are the conjugate ones that has equal neutron and proton numbers on same large shell, they should contribute to the excitation energy equal on low ly- ing excited states, this work avoid the big problem of energy allocation evaluation. The low excitation energy spectra for the 6 even-even nuclei, 64 Ge32 , 68Se34 , 72Kr36 , 76 Sr38, 80 Zr40 and 84 Mo42, are calculated in theory using experimental value of levels on 28-50 nuclear shell, the spectra calculated are well reproduced the experimental measurement of the complex spectra, supporting the above conjecture. The value of levels on 28-50 nuclear shell are thus obtained, the equivalent strength parameters of interactions between neutron-proton can be used as a starting point for further research.