Deformed configurations, band structures and spectroscopic properties of N = 50 Ge and Se nuclei

. The deformed configurations and rotational band structures in N = 50 Ge and Se nuclei are studied by deformed Hartree–Fock with quadrupole constraint and angular momentum projection. Apart from the ‘almost’ spherical HF solution, a well-deformed configuration occurs at low excitation. A deformed well-mixed Ω = 1/2 + neutron orbit comes down in energy (from the shell above N = 50) to break the N = 50 spherical shell closure. A K = 7 − isomer is predicted in 84 Se at fairly low excitation energy. At higher excitation energies (8 MeV), a deformed band with Ω = 7/2 + – 1/2 − (based on h 11/2 ) neutron 1p–1h excitation, for 82 Ge and 84 Se, is shown in our calculation. Our study gives insight into possible deformed structures at spherical shell closure.