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Multiple SU(3) algebras in interacting boson model and shell model: Results for (β,γ) bands and scissors 1+ band
Nuclear Physics A ( IF 1.7 ) Pub Date : 2021-09-14 , DOI: 10.1016/j.nuclphysa.2021.122313
V.K.B. Kota 1 , R. Sahu 2
Affiliation  

Shell model (SM) and interacting boson model (IBM) spaces admit multiple SU(α)(3) algebras generating the same rotational spectra but different E2 decay properties, depending on the phases α in the quadrupole generator. In the ground (g) K=0+ bands in nuclei this is demonstrated recently using systems with nucleons in a single oscillator shell (Kota et al. (2019) [23]; (2020) [25]). Going beyond these preliminary studies, results are presented here for E2 decay properties of β and γ bands members, as generated by multiple SU(3) algebras, using sdgIBM and sdgiIBM examples. Also, presented are some results for the γ band using a SM example with eight protons in sdg space. In addition, results are presented for the E2 and M1 decay properties of the levels of the scissors 1+ band in heavy nuclei using sdgIBM-2 and sdgiIBM-2. The scissors 1+ band properties are also studied using a SM example with six protons in (pf) shell and twelve neutrons in (sdg) shell. These results establish that: (i) with multiple SU(3) algebras, it is possible to have rotational bands with very weak E2 strengths among the levels where normally one expects strong strengths; (ii) E2 decay strengths of the levels of γ band (also β band) to the ground band levels are quite different for some of the SU(α)(3) algebras with strong dependence on (α); (iii) it is possible to have the scissors 1+ band with the E2 and M1 decay of the low-lying levels of this band to the g band levels are strong or weak depending on (α).



中文翻译:

相互作用玻色子模型和壳模型中的多个 SU(3) 代数:(β,γ) 带和剪刀 1+ 带的结果

壳模型 (SM) 和相互作用玻色子模型 (IBM) 空间承认多个 (α)(3)代数产生相同的旋转光谱但不同的E 2 衰减特性,这取决于四极杆发生器中的相位α。在地面(=0+最近使用在单个振荡器壳中具有核子的系统证明了这一点(Kota 等人(2019 年)[23];(2020 年)[25])。除了这些初步研究之外,这里还介绍了βγ波段成员的E 2 衰减特性的结果,这些特性由多个(3)代数,使用sdg IBM 和dG一世IBM 示例。此外,还使用sdg空间中具有八个质子的 SM 示例展示了γ波段的一些结果。此外,还提供了剪刀能级的E 2 和M 1 衰减特性的结果1+使用sdg IBM-2 和dG一世IBM-2。剪刀1+ 还使用具有六个质子的 SM 示例研究了能带特性 (F) 壳和十二个中子 (dG)贝壳。这些结果表明:(i) 具有多个(3)代数,在通常人们期望强强度的水平中,可能有具有非常弱的E 2 强度的旋转带;(ii) γ波段(也是β波段)的能级与地波段能级的E 2 衰减强度对于某些(α)(3) 强依赖的代数 (α); (iii) 可以有剪刀1+E 2 和M 1 衰减该频段的低电平到g频段电平的强或弱取决于(α).

更新日期:2021-09-24
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