カルシウム以下のN=32殻閉殻; 50Arの低励起構造

Le résumé fourni par la source

Low-lying excited states in the $N$ = 32 isotope $^{50}$Ar were investigated by in-beam $\gamma$-ray spectroscopy following proton- and neutron-knockout, multinucleon removal, and proton inelastic scattering at the RIKEN Radioactive Isotope Beam Factory. The energies of the two previously reported transitions have been confirmed, and five additional states are presented for the first time, including a candidate for a 3$^{-}$ state. The level scheme built using $\gamma$ $\gamma$ coincidences was compared to shell-model calculations in the $sd-pf$ model space and to {\it ab initio} predictions based on chiral two- and three-nucleon interactions. Theoretical proton- and neutron-knockout cross sections suggest that two of the new transitions correspond to 2$^{+}$ states, while the previously proposed 4$^{+}_{1}$ state could also correspond to a 2$^{+}$ state.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.