Investigation of the ground-state spin inversion in the neutron-rich 47,49Cl isotopes

TL;DR

This study investigates the ground-state spin properties of neutron-rich 47,49Cl isotopes using gamma-ray spectroscopy and knockout reactions, revealing a spin inversion phenomenon in these nuclei.

Contribution

It provides the first gamma-ray spectroscopy data for 47,49Cl and determines their ground-state spins, highlighting a spin inversion in neutron-rich chlorine isotopes.

Findings

Ground state of 49Cl is J = 3/2+

Spin inversion observed in neutron-rich chlorine isotopes

First spectroscopic data for 47,49Cl obtained

Abstract

A first gamma-ray study of 47,49Cl spectroscopy was performed at the Radioactive Isotope Beam Factory with 50Ar projectiles at 217 MeV/nucleon, impinging on the liquid hydrogen target of the MINOS device. Prompt de-excitation gamma-rays were measured with the NaI(Tl) array DALI2+. Through the one-proton knockout reaction 50Ar(p,2p), a spin assignment could be determined for the low-lying states of 49Cl from the momentum distribution obtained with the SAMURAI spectrometer. A spin-parity J = 3/2+ is deduced for the ground state of 49Cl, similar to the recently studied N = 32 isotope 51K.