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Deformed structure; constrained Hartree–Fock; shell closure; rotational band; electromagnetic properties.

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 $\Omega = 1/2^+$ 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 ⁸⁴Se 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 ⁸²Ge and ⁸⁴Se, is shown in our calculation. Our study gives insight into possible deformed structures at spherical shell closure.

S K Ghorui¹ C R Praharaj²

1. Department of Physics, IIT Ropar, Rupnagar 140 001, India
2. Institute of Physics, Bhubaneswar 751 005, India

Published

April 2014

Early published

20 March 2014