Isospin effects in the photodisintegration of light nuclei

K. G. McNeill, M. N. Thompson, A. D. Bates, J. W. Jury, and B. L. Berman
Phys. Rev. C 47, 1108 – Published 1 March 1993
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Abstract

Using the corpus of data on the (γ,p), (γ,n), (γ,2n), and (γ,n0) cross sections of nine light nuclei (13C, C14, N15, O17, O18, Mg25, Mg26, Si29, and Si30), the T> and T< isospin components of the giant dipole resonance have been separated. The relative strengths of these components have been extracted, together with the energy differences between the centroids of the components. The ratio of the T> energy-weighted integrated cross section to the total cross section is somewhat better represented by the simple geometric factor 1/(T0+1), where T0 is the isospin of the ground state of the excited nucleus, than by a more complete expression which takes into account dynamical effects. If the energy difference between the centroids is represented by U*(T0+1)/A, the average value of U* for the three p shell nuclei is found to be 57 MeV, while that for the six s-d shell nuclei is 93 MeV.

  • Received 18 May 1992

DOI:https://doi.org/10.1103/PhysRevC.47.1108

©1993 American Physical Society

Authors & Affiliations

K. G. McNeill

  • Physics Department, University of Toronto, Toronto, Ontario, Canada M5S 1A7

M. N. Thompson and A. D. Bates

  • School of Physics, University of Melbourne, Parkville, Victoria 3052, Australia

J. W. Jury

  • Physics Department, Trent University, Peterborough, Ontario, Canada K9J 7B8

B. L. Berman

  • Center for Nuclear Studies, Department of Physics, The George Washington University, Washington, D.C. 20052

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Vol. 47, Iss. 3 — March 1993

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