High-spin structure of {sup 82}Y
- Tata Institute of Fundamental Research, Bombay 400 005 (India)
The high-spin states of {sup 82}Y have been studied up to an excitation energy {similar_to}10 MeV and a spin of 23{h_bar} through the {sup 58}Ni({sup 27}Al,2{ital pn}){sup 82}Y reaction using 92 MeV {sup 27}Al beam and in-beam {gamma}-ray spectroscopic techniques. The electromagnetic properties and the structure of high-spin states in the positive parity band and the negative parity band have been investigated through a measurement of several new lifetimes. The experimentally obtained transition quadrupole moments exhibit a transition from a near spherical shape with {ital Q}{sub {ital t}}{similar_to}0.6 eb to a deformed shape with {ital Q}{sub {ital t}}{similar_to}2.1 eb around a spin {ital I}{similar_to}9{h_bar} for the positive and negative parity bands and are in reasonable agreement with those calculated using deformation parameters ({beta},{gamma}) as predicted by the total Routhian surface calculations. The observed signature splitting, quasiparticle alignments, the kinematic, and dynamic moment of inertias as a function of rotational frequency {h_bar}{omega} or spin I have been discussed within the framework of the cranked shell model and the projected Hartree-Fock calculations. The experimental and theoretical results indicate the two neutron alignment at {h_bar}{omega}{similar_to}0.66 MeV in the positive parity band. The observed band-crossing frequency {h_bar}{omega}{similar_to}0.67 MeV in the negative parity band also indicates two neutron alignment.
- OSTI ID:
- 55138
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 51; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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