Microscopic study of positive-parity yrast bands of 224−234Th isotopes

Pramana

Rani Devi¹  S K Khosa¹  Daya Ram¹ 

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关键词: Projected shell model;    yrast energies;    band diagram;    electromagnetic quantities.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

The positive-parity bands in 224−234Th are studied using the projected shell model (PSM) approach. The energy levels, deformation systematics, 𝐵(𝐸2) transition probabilities and nuclear 𝑔-factors are calculated and compared with the experimental data. The calculation reproduces the observed positive-parity yrast bands and 𝐵(𝐸2) transition probabilities. Measurement of 𝐵(𝐸2) transition probabilities for higher spins and 𝑔-factors would be a stringent test for our predictions. The results of theoretical calculations indicate that the deformation systematics in 224−234Th isotopes depend on the occupation of low 𝑘 components of high j orbits in the valence space and the deformation producing tendency of the neutron–proton interaction operating between spin orbit partner (SOP) orbits, the $[(2g_{9/2}_{𝜋}) - (2g_{7/2})_{𝜈}]$ and $[(1i_{13/2})_{𝜋} - (1i_{11/2})_{𝜈}]$ SOP orbits in the present context. In addition, the deformation systematics also depend on the polarization of $(1h_{11/2})_{𝜋}$ orbit. The low-lying states of yrast spectra are found to arise from 0-quasiparticle (qp) intrinsic states whereas the high-spin states turn out to possess composite structure.

【 授权许可】

Unknown