Feshbach-Kerman-Koonin model analysis of preequilibrium (p,p) and (p,n) reactions at 12 to 26 MeV

Y. Watanabe, A. Aoto, H. Kashimoto, S. Chiba, T. Fukahori, K. Hasegawa, M. Mizumoto, S. Meigo, M. Sugimoto, Y. Yamanouti, N. Koori, M. B. Chadwick, P. E. Hodgson

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27 Citations (Scopus)


Double-differential proton emission cross sections have been measured for proton-induced reactions on Mo98 and Pd106 at incident energies around 26 MeV. Several sets of (p,p) and (p,n) data for both target nuclei at incident energies from 12 to 26 MeV are analyzed in terms of the multistep-direct (MSD) and multistep-compound (MSC) reaction models of Feshbach, Kerman, and Koonin (FKK). The strength V0 of the effective N-N interaction is extracted from a fit of the calculated MSD spectrum to the experimental data using the subtraction method of isolating and analyzing the MSD component alone. A similar analysis is also applied to (p,p) and (n,n) data for Nb93 in the same energy region. The experimental nucleon emission spectra at 26 MeV are reproduced well by the calculation that includes preequilibrium MSD and MSC emission, direct collective excitation to low-lying discrete levels, and Hauser-Feshbach equilibrium emission in a quantum-mechanical way. The systematic dependence of V0 on the incident energy and the nature of projectiles and ejectiles is investigated. In addition, the sensitivities to input parameters used in the MSD calculation (the optical model potential parameters, the pairing correction, and the nonlocality correction) are examined in order to see their effect on the determination of V0. The possibility of gradual absorption of reaction flux from the P to the Q chain is also discussed through analyses of preequilibrium (p,p) and (p,n) spectra using a phenomenological phase space approach.

Original languageEnglish
Pages (from-to)1891-1907
Number of pages17
JournalPhysical Review C
Issue number4
Publication statusPublished - 1995

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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