LXX International conference "NUCLEUS – 2020. Nuclear physics and elementary particle physics. Nuclear physics technologies"

Investigation of Exotic $^7$He Nucleus within the SS-HORSE-NCSM approach

Not scheduled

25m

Online

Oral report Section 1. Experimental and theoretical studies of the properties of atomic nuclei. Will not participate

Speaker

Igor Mazur (Pacific National University, Khabarovsk, Russia; University of Korea, Seoul, Republic of Korea)

Description

We present ab initio calculations of resonances for exotic $^7$He, a nucleus with no bound states, using the realistic nucleon-nucleon interactions Daejeon16 [1] and JISP16 [2]. For this, we evaluate the $n{-}{^6\rm He}$ elastic scattering phase shifts obtained within an $S$-matrix analysis of no-core shell model results for states in the continuum (SS-HORSE-NCSM approach [3]).

Results with Daejeon16 and preliminary results with JISP16 for $3/2^-$ and $5/2^-$ states are in reasonable agreement with experimental data. We obtain and discuss $1/2^-$ resonance. There is contradictory information about energy and width of this resonance in different experiments. Also we predict new broad resonances likely related to fragmentary experimental evidence.

[1] A. M. Shirokov, I. J. Shin, Y. Kim, M. Sosonkina, P. Maris and J. P. Vary, Phys. Lett. B 761, 87 (2016);

[2] A. M. Shirokov, J. P. Vary, A. I. Mazur and T. A. Weber, Phys. Lett. B 644, 33 (2007);

[3] A. M. Shirokov, A. I. Mazur, I. A. Mazur and J. P. Vary, Phys. Rev. C 94, 064320 (2016).