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
Shell model (SM) and interacting boson model (IBM) spaces admit multiple algebras generating the same rotational spectra but different E2 decay properties, depending on the phases α in the quadrupole generator. In the ground (g) 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 algebras, using sdgIBM and IBM 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 band in heavy nuclei using sdgIBM-2 and IBM-2. The scissors band properties are also studied using a SM example with six protons in shell and twelve neutrons in shell. These results establish that: (i) with multiple 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 algebras with strong dependence on ; (iii) it is possible to have the scissors 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 .
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 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(克)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β和γ波段成员的E 2 衰减特性的结果,这些特性由多个代数,使用sdg IBM 和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 衰减特性的结果使用sdg IBM-2 和IBM-2。剪刀 还使用具有六个质子的 SM 示例研究了能带特性 壳和十二个中子 贝壳。这些结果表明:(i) 具有多个代数,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 强依赖的代数 ; (iii) 可以有剪刀带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.