The 29th International Nuclear Physics Conference (INPC 2025)

Exploration on the effective nuclear interaction around 132Sn and 208Pb

Not scheduled

20m

Daejeon Convention Center (DCC)

Contributed Poster Presentation Nuclear Structure Poster Session

Speaker

Menglan Liu (Sun Yat-sen University)

Description

Configuration-interaction shell model (CISM) has been a powerful tool for investigating the nuclear structure properties. Within the CISM framework, one chooses the model space, constructs the effective Hamiltonian, and diagonalizes the Hamiltonian matrix. However, investigation on the neutron-rich medium and heavy nuclei is challenging due to the insufficient knowledge on the effective Hamiltonian.
To this end, an effective nuclear force capable of describing medium and heavy mass nuclei is highly anticipated. Based on the monopole-based universal interaction VMU [1] and the M3Y spin-orbit force [2], eight effective Hamiltonians can be constructed around 132Sn and 208Pb. The strength of each component of the effective nuclear force was explored to reproduce the excitation spectra of nuclei around 132Sn and 208Pb [3]. To date, the root-mean square error of 725 excitation energies can be reduced to around 150 keV.
The primarily derived strength of the effective nuclear force has also been successfully applied to the region “north” of 132Sn and “south” of 208Pb. For the former, it has been applied to investigate the microscopic nuclear level density in Xe and Ba isotopes [4], the L-forbidden M1 transition in 139La [5], the spin assignment of 140-142La [6], and the enhancement of the shell gap reveled by new isotopes 160Os and 156W [7]. For the latter, it has been applied to systematically study the spectroscopic properties in nuclei around 208Pb [8], and to particularly study the newly observed long-lived isomers driven by monopole force in 213,215Tl [9], and to predict β-decaying isomers with N>126 for potential influence on the r-process [10].

References
[1] T. Otsuka, T. Suzuki, M. Honma, Y. Utsuno, N. Tsunoda, K. Tsukiyama, and M. Hjorth-Jensen. Phys. Rev. Lett. 104, 012501 (2010).
[2] G. Bertsch, J. Borysowicz, H. McManus, and W. G. Love, Nucl. Phys. A 284, 399 (1977).
[3] M. Liu and C. Yuan, Int. J. Mod. Phys. E, 32, 12, 2330003 (2023).
[4] J. Chen, M. Liu, C. Yuan, S. Chen, N. Shimizu, X. Sun, R. Xu, and Y. Tian, Phys. Rev. C 107, 054306 (2023).
[5] Z. Wang, G. Zhang, W. Jiang, M. Liu, C. Yuan et al. , Nucl. Sci. Tech., accepted.
[6] A. Navin, E. Wang, S. Bhattacharyya, M. Liu, C. Yuan et al. , submitted.
[7] H. Yang, Z. Gan, Y. Li, M. Liu, S. Xu et al. , Phys. Rev. Lett., 132, 072502 (2024).
[8] C. Yuan, M. Liu, N. Shimizu, Z. Podolyák, T. Suzuki, T. Otsuka, and Z. Liu.
Phys. Rev. C 106, 044314 (2022).
[9]T. T. Yeung, A. I. Morales, J. Wu, M. Liu, C. Yuan et al. , Phys. Rev. Lett. 133, 072501 (2024).
[10] M. Liu, C. Yuan, G. Zhang, Y. Zhang, and C. Qi, submitted.