Structure in the giant resonance region of O16 observed with the reaction C13(He3,γ)O16

E. Ventura, J. R. Calarco, C. C. Chang, E. M. Diener, D. G. Mavis, S. S. Hanna, and G. A. Fisher
Phys. Rev. C 19, 1705 – Published 1 April 1979
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Abstract

The capture reaction C13(He3,γ)O16 has been studied over an excitation energy range of 25 to 30 MeV in O16. The 90° differential yield curve for the ground state transition shows resonances at Ex=25.1, 26.0 and 27.3 MeV. The measured angular distributions are consistent with a spin and parity assignment of Jπ=1— to these states. The relation between this structure and that observed in the N15(p,γ0)O16 reaction is discussed. The 90° differential yield curves for the doublet transitions γ1+γ2 and γ3+γ4 were also measured. The former shows resonances at Ex=26.0, 26.6, 27.2, 27.7, and 28.6 MeV, while the latter shows a broad resonance centered at Ex27.5 MeV with mild structure. Both curves suggest the existence of giant resonance strength built on the excited states of O16.

NUCLEAR REACTIONS C13(He3,γ)O16, 3HeE = 3.0-8.5 MeV, measured σ(EHe3,Eγ,θ). O16 deduced resonances and structure in giant resonance region. Enriched C13 target.

  • Received 6 September 1978

DOI:https://doi.org/10.1103/PhysRevC.19.1705

©1979 American Physical Society

Authors & Affiliations

E. Ventura

  • Department of Physics, Stanford University, Stanford, California 94305 and Department de Fisica, Comision Nacional de Energia Atomica, Buenos Aires, Argentina

J. R. Calarco, C. C. Chang*, E. M. Diener, D. G. Mavis, and S. S. Hanna

  • Department of Physics, Stanford University, Stanford, California 94305

G. A. Fisher

  • Department of Physics, Stanford University, Stanford, California 94305 and Department of Physics, San Francisco State University, San Francisco, California 94132

  • *Present address: University of Maryland, College Park, Maryland 20742.

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Vol. 19, Iss. 5 — April 1979

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