The nuclear structure calculations for strontium, zirconium, and molybdenum isotopes are performed in a large configuration 'space by employing a quadrupole-plus-pairing-interaction Hamiltonian. The possible factors responsible for the sudden onset of deformation at %=60 in these nuclei are pointed out from the systematics of the occupancies of the single particle orbitals derived from the variational microscopic calculations. The energy spectra and the B(E2}values in the doubly even 'Sr, '~' Zr, and '~' Mo obtained from the variation-after-projection formalism are in good agreement with the corresponding experimental data.
Level energies and details of the ?-ray decay scheme in "Cr are determined by Ge(Li) spectrometer and angular correlation techniques. Spin 3/2 is assigned to levels a t 0.748, 1.898, 2.893, 3.125, and 3.769 MeV. A level a t 776 keV, for which spin 1/2-is favored, ma)
Coincidence and angular correlation measurements have been made on γ rays following thermal-neutron capture in separated targets of 52Cr and 53Cr. The following spin assignments are made in 53Cr: 0.563-, 2.32-, 2.71-, and 3.62-MeV levels, 1/2, 3/2, 1/2, and (3/2) respectively, and in 54Cr: 2.63-, 2.84-, 3.08-, 3.73-, 4.91-, and 5.30-MeV levels, 2,(0)2, 2, 1 or 2, 1 or 2, and 1, 2, or 3 respectively. Details of the decay schemes, branching ratios, and γ-ray multipole mixtures are given also.
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