Cluster nature and parity of the 9.155 MeV state in N15

L. H. Harwood, K. W. Kemper, J. D. Fox, and A. H. Lumpkin
Phys. Rev. C 18, 2145 – Published 1 November 1978
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Abstract

The lifetime of the 9.155 MeV J=52 state in N15 has been measured to be < 13 fsec from a study of the C12(Li7, αγ)N15 reaction at ELi7=28 MeV. The γ decay from the 9.155 MeV state to the 5.30 MeV 12+ state is established as E2 and thereby determines the parity of the 9.155 MeV state to be positive. Particle-gated γ-ray spectra from C12(Li7, αγ) and C12(Li6, He3γ) reactions show that the 9.155 MeV state has a large triton cluster parentage. The other member of the unresolved doublet, the 9.152 MeV 32 state, has a very small cluster parentage. These results are in disagreement with simple C12+t interpretations of N15 but agree with weak coupling model calculations.

NUCLEAR STRUCTURE C12(Li6, He3γ), E=34 MeV; C12(Li7, αγ), E=34 MeV, measured cross section to 9.155 and 9.152 MeV N15 states; deduced lifetime and parity of 9.155 MeV state, compared to cluster and shell models.

  • Received 27 June 1978

DOI:https://doi.org/10.1103/PhysRevC.18.2145

©1978 American Physical Society

Authors & Affiliations

L. H. Harwood, K. W. Kemper, J. D. Fox, and A. H. Lumpkin

  • Department of Physics, The Florida State University, Tallahassee, Florida 32306

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Issue

Vol. 18, Iss. 5 — November 1978

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