Proton single-particle energy gaps in Sc isotopes

Abstract

Variation in the proton single-particle energy gaps is investigated within the framework of nuclear shell model. The change is identified to originate mainly from the central force of the proton-neutron interaction. The relationship between the nuclear state and the single-particle energy gap is discussed. The first 3/2− state of 55Sc reveals the fragile character of N = 34 semi-magic shell gap.