Ab initio no-core shell model study of neutron-rich 18,19,20C isotopes

Abstract

We implement the ab initio no-core shell model approach to study neutron rich 18C, 19C and 20C isotopes. For this purpose, we employ charge-dependent Bonn 2000 (CDB2K), inside non-local outside Yukawa (INOY) and chiral next-to-next-to-next-to-leading order (N3LO) nucleon-nucleon interactions. Low-lying energy spectra, electromagnetic properties and point-proton radii for these nuclei up to basis space Nmax = 4 are calculated. Binding energies obtained with INOY interaction are in better agreement with the experimental values as compared to other ab initio interactions. We also show behavior of ground state energy and point-proton radii with the NCSM parameters, ħΩ and Nmax. We report a strong sensitivity of the B(E2) values from the first excited 2+ to ground state of 18C and 20C to the nuclear interaction. Shell model calculations with YSOX interaction are also performed, and corresponding results are compared with ab initio one.