Photoneutron reaction in O17: Ground-state differential cross section at 98°

R. G. Johnson, B. L. Berman, K. G. McNeill, J. G. Woodworth, and J. W. Jury
Phys. Rev. C 20, 27 – Published 1 July 1979
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Abstract

Photoneutron spectra from O17 have been obtained at bremsstrahlung end-point energies of 13.7, 16, 22, 28, and 34 MeV using the neutron time-of-flight technique. The angle between the incident photon beam and the 49.2-m flight path was 98°. From the measured spectra the differential cross section for the O17(γ,n0)O16 reaction between 5 and 33 MeV was obtained. The considerable structure in the cross section is compared with the known spectrum of levels for this nucleus compiled from previous studies using various reactions. In the region below 19 MeV, 18 resonances correspond to levels previously identified. In addition at least 12 other resonances which have not been seen previously have been observed. In the giant dipole resonance region (above 19 MeV) the present results delineate the T=12 strength. The measurement is compared to the O16(p,γ0+γ1)F17 reaction with the expected similarities observed. The measurement also is compared to 1p,2p-1h shell-model calculations.

NUCLEAR REACTIONS O17(γ,n0) O16, Ex=5.033.0 MeV; measured photoneutron time-of-flight spectra; deduced (dσdΩ) (Ex, 98°), resonant structure; T=12 strength of the GDR.

  • Received 19 December 1978

DOI:https://doi.org/10.1103/PhysRevC.20.27

©1979 American Physical Society

Authors & Affiliations

R. G. Johnson*, B. L. Berman, K. G. McNeill, and J. G. Woodworth

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

J. W. Jury

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

  • *Present address: Lawrence Livermore Laboratory, University of California, Livermore, CA 94550. Permanent address: Department of Physics, The Pennsylvania State University, Delaware County Campus, Media, PA 19063.
  • Permanent address: Lawrence Livermore Laboratory, University of California, Livermore, CA 94550.
  • Present address: Lawrence Livermore Laboratory, University of California, Livermore, CA 94550.

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Vol. 20, Iss. 1 — July 1979

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