Study of the proton-neutron interaction around 68 Ni: Vibrational Structure of 72,74 Zn

Abstract

We propose to study the 72Zn nucleus, 2 protons and 2 neutrons away from the possible double-magic 68Ni nucleus, by means of Coulomb Excitation in inverse kinematics. Current data suggest almost degenerated 2+ states of 2-phonon and mixed-symmetric character, respectively. The identification of the 2+ ms state in 72Zn will be a direct measure of the interaction between valence protons and neutrons what is the key to understand the nature of 68Ni. We furthermore propose to study the unusual behavior of the first excited 0+ state in this region using the t(72Zn,p)74Zn reaction.