C14(e+,e-)14O reaction between 19 and 80 MeV

M. J. Leitch, H. W. Baer, R. L. Burman, C. L. Morris, J. N. Knudson, J. R. Comfort, D. H. Wright, R. Gilman, S. H. Rokni, E. Piasetzky, Z. Weinfeld, W. R. Gibbs, W. B. Kaufmann

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34 Scopus citations

Abstract

Cross-section measurements are reported for the C14(e+,e-)14O reaction to the double isobaric analog state and for nonanalog states at 5 to 10 MeV excitation. The extrapolated zero-degree cross sections are 2.3+0.5, 3.7+0.4, 2.2+0.3, and 0.9+0.3 1/4b/sr at 19.0, 29.1, 64.4, and 79.5 MeV, respectively. The nonanalog-state cross sections are found to rise sharply with increasing beam energy above 50 MeV, in contrast to those of the double isobaric analog state transition. Calculations with a phenomenological isospin-dependent optical potential must include an isotensor term, which accounts for transitions through nonanalog intermediate states or other short-range correlations, in order to describe the energy and angular trends of the data. Microscopic calculations in the second-order distorted-wave impulse approximation fail to reproduce the cross sections near 50 MeV unless the effects of short-range correlations beyond those contained in the model are incorporated.

Original languageEnglish (US)
Pages (from-to)2356-2366
Number of pages11
JournalPhysical Review C
Volume39
Issue number6
DOIs
StatePublished - Jan 1 1989

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Leitch, M. J., Baer, H. W., Burman, R. L., Morris, C. L., Knudson, J. N., Comfort, J. R., Wright, D. H., Gilman, R., Rokni, S. H., Piasetzky, E., Weinfeld, Z., Gibbs, W. R., & Kaufmann, W. B. (1989). C14(e+,e-)14O reaction between 19 and 80 MeV. Physical Review C, 39(6), 2356-2366. https://doi.org/10.1103/PhysRevC.39.2356