Speaker
Description
As a proton-emitter located beyond the proton drip line, $^{185}\mathbf{Bi}$ possesses unique properties, such as susceptibility to deformation, continuum effects, etc. A recent experiment confirmed the $1/2^+$ ground state, but left long-lived isomeric state hard to explain. The study of proton emission can promote a large number of exotic phenomena and new physics. The difficulties in experimental measurement brought about by low reaction cross-sections and short half-lives provide opportunities and challenges for related theoretical studies. Its achievements will also lay the foundation for future research and provide certain guiding.
The GCC method is used, while a deformed proton-emitter is constructed using the particle-rotor model, and it is expanded in complex momentum space using Berggren basis. As Berggren basis includes bound and unbound states, the wave functions of the internal and asymptotic regions can be processed in a unified framework, thereby introducing the continuum effect.
Taking $^{185}\mathbf{Bi}$ as the research object, we calculate the variation of the single particle energy level of the core with deformation. By comparing it with the Nilsson energy level, the Thomas-Ehrman effect is studied. Further, the energy spectrum of $^{185}\mathbf{Bi}$ under different deformation parameters is calculated. The calculated energy spectrum is cross checked with the results obtained by the TRS method, reproducing the $1/2^+$ ground state measured in the experiment, and the ground state should be formed by a long ellipsoidal nucleus of $β_2≈0.3$. In a nearly spherical case, it is highly likely that there are two $7/2^-$ state and $9/2^-$ state.
| Research field of your presentation | Theoretical Low-energy nuclear physics |
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