NUCLEAR STRUCTURE STUDY AROUND Z = 28.

Yrast levels of Ni, Cu and Zn isotopes for 40 ≤ N ≤ 50 have been described by state-of-the-art shell model calculations with three recently available interactions using 56Ni as a core in the f5/2pg9/2 model space. The results are unsatisfactory viz. large E(2+) for very neutron-rich nuclei, small B(E2) values in comparison to experimental values. These results indicate an importance of inclusion of πf7/2 and νd5/2 orbitals in the model space to reproduce collectivity in this region. [ABSTRACT FROM AUTHOR]