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Quasiparticle alignment in the most deformed krypton isotope Kr 74

Quasiparticle alignment in the most deformed krypton isotope Kr 74 High-spin states in Kr 74 were studied using the Ni 58 ( 19 F, p 2 n ) 74 Kr reaction at 62 MeV. States up to ( 14 + ) in the ground state band and a number of states in three side bands were placed in the level scheme. The level scheme of Kr 74 closely resembles those of Kr 76 and Kr 78 . Quasiparticle alignment occurs at ħω≊0.65 MeV in agreement with a recent calculation. There is no evidence for an alignment at lower frequency as was previously reported. Mean lifetimes were measured for six states in the ground state band of Kr 74 using the Doppler shift attenuation and recoil-distance methods. The lifetimes imply transition quadrupole moments of 3.2-3.3 e b, the highest known among Kr isotopes. The corresponding axial deformation is β 2 ≊0.41. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review C American Physical Society (APS)

Quasiparticle alignment in the most deformed krypton isotope Kr 74

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1990 The American Physical Society
ISSN
1089-490X
DOI
10.1103/PhysRevC.41.2658
Publisher site
See Article on Publisher Site

Abstract

High-spin states in Kr 74 were studied using the Ni 58 ( 19 F, p 2 n ) 74 Kr reaction at 62 MeV. States up to ( 14 + ) in the ground state band and a number of states in three side bands were placed in the level scheme. The level scheme of Kr 74 closely resembles those of Kr 76 and Kr 78 . Quasiparticle alignment occurs at ħω≊0.65 MeV in agreement with a recent calculation. There is no evidence for an alignment at lower frequency as was previously reported. Mean lifetimes were measured for six states in the ground state band of Kr 74 using the Doppler shift attenuation and recoil-distance methods. The lifetimes imply transition quadrupole moments of 3.2-3.3 e b, the highest known among Kr isotopes. The corresponding axial deformation is β 2 ≊0.41.

Journal

Physical Review C – American Physical Society (APS)

Published: Jun 1, 1990

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