Rotational states in neutron-deficient /sup 139/Gd
States have been established in the neutron-deficient /sup 139/Gd nucleus for the first time via the /sup 92/Mo(/sup 50/Cr,2pn..gamma..) reaction. Both ..gamma..-..gamma.. and ..gamma..-n coincidence techniques were employed. The yrast band, built on the ..nu..h/sub 11/2/(514)(9/2/sup -/ orbital, shows a signature splitting of approx.100 keV implying a significant triaxial shape. At a rotational frequency (h/2..pi..)..omega..approx.0.29 MeV a pair of h/sub 11/2/ quasiprotons align. Associated with this alignment are a decrease in the signature splitting, indicating a near-prolate nuclear shape, and an enhancement of the interband M1 transitions relative to the E2 crossovers, which is consistent with a mixed neutron-proton configuration. In addition, a tentative decoupled band showing the characteristics of a band theoretically expected for the ..beta..-driving ..nu..i/sub 13/2/ orbital was observed.
- Research Organization:
- Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794
- OSTI ID:
- 6529793
- Journal Information:
- Phys. Rev. C; (United States), Vol. 39:2
- Country of Publication:
- United States
- Language:
- English
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651720* - Nuclear Properties & Reactions
A=90-149
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