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The interacting boson model with isospin (IBM-3) is applied to study the band structure and electromagnetic transition properties of the low-lying states in the cross-conjugate nuclei 44Ti and 52Fe. The isospin excitation states with T=0, 1 and 2 are identified and compared with available data. The E2 and M1 matrix elements for the low-lying states have been investigated. According to this study, the 23+ state is the lowest mixed symmetry state in the cross-conjugate nuclei 44Ti and 52Fe. The excitation energy of the second 02+ and 22+ states with T=0 in the nucleus 52Fe are identified. The agreement between the model calculations and data is reasonably good. 相似文献
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The interacting boson model-3(IBM-3) has been used to study the low-energy level structure and electromagnetic transitions of 68Ge nucleus. The main components of the wave function for some states are also analyzed respectively. The theoretical calculations are in agreement with experimental data, and the 68Ge is in transition from U(5) to SU(3). 相似文献
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Spectra and E2 transition rates for the 160-170Er isotopes are studied in the framework of the interaction boson model. A schematic Hamiltonian able to describe their spectra and B(E2) transition is used. It is found that the 160-170Er isotopes are in the transition from the vibrational limit to rotational limit. 相似文献
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The interacting boson model with isospin (IBM-3) has been used to study mixed symmetry states and electromagnetic transitions at low-lying states for a ^28Si nucleus. The theoretical calculations show that the 24^+ state is the lowest mixed symmetry state in ^28Si and the 43+ state is also a mixed symmetry state. 相似文献
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Critical behaviour in nuclear structure from spherical to axially symmetric deformed shape in IBM 下载免费PDF全文
To compare with the predictions of the transitional
dynamical symmetry X(5)
proposed by Iachello (2001 Phys. Rev. Lett. 87 052502), the critical
behaviours of U(5)--SU(3) are studied in the space of two control
parameters in the interacting boson model (IBM). A simple-shaped phased diagram
has been presented. It is found that X(5) predictions cannot be exactly
reproduced by our calculations and that the best agreement is close to the
calculations with boson numbers N = 11 and 12. By comparing with experimental
data on X(5)-like nuclei, we find that X(5) predictions and IBM
calculations can reproduce the energy ratios and E2 transition ones. 相似文献
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利用最近提出的E-GOS理论分析方法, 对A~130质量区域的核进行了分析研究, 发现该区域的核基本上处于U(5)→SU(3)过渡区域, 124—130Ba核更接近于O(6)核. 相似文献
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采用相互作用玻色子模型研究了140-162Gd偶偶核的低能谱和电磁跃迁,应用一个U(5)→SU(3)的简化哈密顿量很好地描述它们的低能谱和电磁跃迁过渡.结果表明140-162Gd同位素核基本上属于U(5)→SU(3)的过渡核. 相似文献