C12(n,p)12B reaction at 56, 60, and 65 MeV

F. P. Brady, T. D. Ford, G. A. Needham, J. L. Romero, D. S. Sorenson, C. M. Castaneda, J. L. Drummond, E. L. Hjort, B. McEachern, N. S. P. King, and D. J. Millener
Phys. Rev. C 43, 2284 – Published 1 May 1991
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Abstract

The C12(n,p)12B reaction has been studied at 60 and 65 MeV. Cross sections for the 1+ ground state, the 2+ first excited state at 0.95 MeV, an unresolved pair of 2 and 4 states at 4.4 MeV, and the analogs of the giant electric dipole and spin-dipole resonances around 7.7 MeV have been extracted and compared with previous data at 56 MeV and with microscopic distorted-wave Born approximation calculations. The shapes of angular distributions out to q∼2 fm1 are well reproduced by the calculations. A comparison of (n,p), (p,n), and (p,p) cross sections near 60 MeV is made, and a value for ‖Jστ‖ (the volume integral of the central, spin-isospin part of the effective nucleon-nucleon interaction) is extracted. The magnitudes of cross sections for negative-parity states can be qualitatively understood when the loose binding of the sd-shell neutron in the final state and the effect of ground-state correlations on the dipole and spin-dipole strengths are taken into account.

  • Received 13 April 1990

DOI:https://doi.org/10.1103/PhysRevC.43.2284

©1991 American Physical Society

Authors & Affiliations

F. P. Brady, T. D. Ford, G. A. Needham, J. L. Romero, D. S. Sorenson, C. M. Castaneda, J. L. Drummond, E. L. Hjort, B. McEachern, and N. S. P. King

  • Crocker Nuclear Laboratory and Department of Physics, University of California, Davis, California 95616

D. J. Millener

  • Physics Department, Brookhaven National Laboratory, Upton, New York 11973

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Issue

Vol. 43, Iss. 5 — May 1991

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