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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 Se at fairly low excitation energy. At higher excitation energies (8 MeV), a deformed band with Ω = 7/2- 1/2 (based on h) neutron 1p-1h excitation, for Ge and Se, is shown in our calculation. Our study gives insight into possible deformed structures at spherical shell closure. [ABSTRACT FROM AUTHOR]

The rotational bands of 161, 163Er are studied by deformed Hartree -- Fock and angular momentum projection techniques. Energy spectra and the matrix elements of electromagnetic operators are calculated up to high spin values J = 59/2 and compared with experimental measurement wherever available. The B(E2) and B(M1) values for some of the bands are evaluated. [ABSTRACT FROM AUTHOR]

The collective band structures of the 125Cs nucleus have been investigated by in-beam γ-ray spectroscopic techniques following the 110Pd ( 19F, 4n) reaction at 75MeV. The previously known level scheme, with rotational bands built on π g 7/2, π g 9/2 and π h 11/2 orbitals, has been extended and evolves into bands involving rotationally aligned ν( h 11/2)2 and π( h 11/2)2 quasiparticles. A strongly coupled band has been reassigned a high- K π h 11/2 ⊗ ν g 7/2 ⊗ ν h 11/2 three-quasiparticle configuration and a new side band likely to be its chiral partner has been identified. Configurations assigned to various bands are discussed in the framework of Principal/Tilted Axis Cranking (PAC/TAC) model calculations. [ABSTRACT FROM AUTHOR]

High-spin states in 123Cs, populated via the 100Mo ( 28Si, p4n) fusion-evaporation reaction at Elab = 130 MeV, have been investigated employing in-beam γ-ray spectroscopic techniques. Rotational bands, built on π g7/2, π g9/2 and the unique-parity π h11/2 orbitals, have been extended and evolve into bands involving rotationally aligned ν( h11/2)2 and π( h11/2)2 quasiparticles. A three-quasiparticle band based on the high- K π h11/2 ⊗ ν g7/2 ⊗ ν h11/2 configuration has also been observed. Total Routhian Surface (TRS) calculations have been used to predict the nuclear shape parameters ( β2, β4, γ) for the various assigned configurations. The assigned configurations have been discussed in the framework of a microscopic theory based on the deformed Hartree-Fock (HF) and angular-momentum projection techniques. [ABSTRACT FROM AUTHOR]

Using deformed Hartree–Fock and the angular momentum projection formalism, the nature of the first band crossings in the high spin structure of [sup 182,184,186]Os, [sup 181,183]Re and [sup 181]Ta are studied. The degree of high-K mixing obtained in the calculation provides a microscopic understanding of the K-forbidden transitions from the high-K bandheads to the yrast states with low-K intrinsic structure. [ABSTRACT FROM AUTHOR]