The 18th CNS International Summer School (CNSSS19)

ΛΛ pairing interactions and correlations in multistrange hypernuclei

22 Aug 2019, 15:55

15m

Wako/Hongo Campus

oral presentation Young Scientist Session 1

Speaker

Ms Yu-Ting Rong (Institute of Theoretical Physics, Chinese Academy of Sciences )

Description

We study multistrange Ca, Sn and Pb hypernuclei with $\mathrm{\Lambda }\mathrm{\Lambda }$ pairing correlations by using the multidimensionally-constraint relativistic Hartree-Bogoliubov (MDC-RHB) model. The axial deformation is allowed and the $\mathrm{\Lambda }\mathrm{\Lambda }\omega$-tensor coupling is included to reproduce the small spin-orbit splittings for $\mathrm{\Lambda }$ hyperon. The separable pairing force of finite-range form is used for the pp channel and the ratio of the $\mathrm{\Lambda }\mathrm{\Lambda }$ pairing to NN pairing strength is determined from the quark model. We find that the shell structure for $\mathrm{\Lambda }$ is very different from that in normal nuclei because of the small spin-orbit splittings in the single $\mathrm{\Lambda }$ spectrum. The pairing energy is similar with HFB calculation results. The $\mathrm{\Lambda }\mathrm{\Lambda }$ pairing makes the $\mathrm{\Lambda }$ density distribution more symmetric but its influence on the total density distribution can be neglected.