Study of the Low-Lying T=32 States in Na21

R. C. Bearse, J. C. Legg, G. C. Morrison, and R. E. Segel
Phys. Rev. C 1, 608 – Published 1 February 1970
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Abstract

The γ decays of the two lowest T=32 states in Na21 at 8.97 and 9.22 MeV were studied as resonances in the Ne20(p, γ) reaction by use of a gas cell and a 30-cc Ge(Li) detector. For the lower resonance, we find three branches: to the 32+ ground state (11%), to the 52+ first excited state (50%), and to the 72+ second excited state (39%). These results imply that J=52+ for the T=32 state. On the simple rotational model, transitions from states of the K=12 (Nilsson orbit #6) band are possible only to the ground-state K=32 (#7) band. A J=52+, K=12 assignment for the lowest T=32 state fits the observed branching ratios. The second resonance decays predominantly to the ground state, and there is at most a 9% branch to the ½+ state at 2.41 MeV. The second resonance is assigned J=12+, K=12. If the 2.41-MeV state is K=12 (#9), no transition to it is expected. On both resonances, transitions to higher excited states are obscured by background.

  • Received 10 September 1969

DOI:https://doi.org/10.1103/PhysRevC.1.608

©1970 American Physical Society

Authors & Affiliations

R. C. Bearse

  • Argonne National Laboratory, Argonne, Illinois 60439

J. C. Legg

  • Kansas State University, Manhattan, Kansas

G. C. Morrison

  • Argonne National Laboratory, Argonne, Illinois 60439

R. E. Segel*

  • Argonne National Laboratory, Argonne, Illinois 60439 and Northwestern University, Evanston, Illinois 60201

  • *Work supported in part by the National Science Foundation.

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Vol. 1, Iss. 2 — February 1970

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