Mechanisms in the 12C(γ,pn) and (γ,pp)reactions

MacGregor, I.J.D. et al. (1998) Mechanisms in the 12C(γ,pn) and (γ,pp)reactions. Physical Review Letters, 80(2), pp. 245-248. (doi:10.1103/PhysRevLett.80.245)

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Abstract

12C(gamma,pn) and (gamma,pp) cross sections have been measured in kinematics which emphasize direct 2N knockout for E(gamma) =­ 120 - 400 MeV and theta(p) = ­23 - 152 deg. The cross sections for both reactions peak strongly in the Delta-resonance region. Theoretical calculations that account for the medium dependence of the Delta propagator predict a similar photon energy dependence to the data and describe the general trends of the measured (gamma,pp)/(gamma,pn) ratio. Both cross sections show strong angular dependence, and the large differences between the two channels indicate different microscopic reaction mechanisms.

Item Type:Articles (Letter)
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McGeorge, Dr John and Owens, Professor Robert and MacGregor, Professor I and Annand, Dr John and Kellie, Dr James
Authors: MacGregor, I.J.D., Yau, T.T.H., Ahrens, J., Annand, J.R.M., Beck, R., Branford, D., Grabmayr, P., Hall, S.J., Harty, P.D., Hehl, T., Kellie, J.D., Lamparter, T., Liang, M., MacKenzie, J.A., McAllister, S., McGeorge, J.C., Owens, R.O., Ryckebusch, J., Sauer, M., Schneider, R., and Watts, D.P.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Group:Nuclear Physics
Journal Name:Physical Review Letters
Journal Abbr.:Phys. Rev. Lett.
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114
Copyright Holders:American Physical Society

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