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

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.51.1891· OSTI ID:6586149

Watanabe, Y; Aoto, A; Kashimoto, H ^[1]; Chiba, S; Fukahori, T; Hasegawa, K; Mizumoto, M; Meigo, S; Sugimoto, M; Yamanouti, Y ^[2]; Koori, N ^[3]; Chadwick, M B ^[4]; Hodgson, P E ^[5]

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1. Department of Energy Conversion Engineering, Kyushu University, Kasuga, Fukuoka 816 (Japan)
2. Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-11 (Japan)
3. Faculty of Integrated Arts and Sciences, The University of Tokushima, Tokushima 770 (Japan)
4. Nuclear Data Group, Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
5. Nuclear Physics Laboratory, Physics Department, University of Oxford, Oxford, OX1 3RH (United Kingdom)

Double-differential proton emission cross sections have been measured for proton-induced reactions on [sup 98]Mo and [sup 106]Pd at incident energies around 26 MeV. Several sets of ([ital p],[ital p][prime]) and ([ital p],[ital 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 [ital V][sub 0] of the effective [ital N]-[ital 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 ([ital p],[ital p][prime]) and ([ital n],[ital n][prime]) data for [sup 93]Nb 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 [ital V][sub 0] 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 [ital V][sub 0]. The possibility of gradual absorption of reaction flux from the [ital P] to the [ital Q] chain is also discussed through analyses of preequilibrium ([ital p],[ital p][prime]) and ([ital p],[ital n]) spectra using a phenomenological phase space approach.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6586149
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 51:4; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663300 -- Nuclear Reactions & Scattering
General-- (1992-)
663430* -- Nucleon-Induced Reactions & Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BARYONS
CHARGED-PARTICLE REACTIONS
COLLECTIVE EXCITATIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELEMENTARY PARTICLES
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
HADRON REACTIONS
HADRONS
MATHEMATICAL SPACE
MOLYBDENUM 98 TARGET
NEUTRONS
NIOBIUM 93 TARGET
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
PALLADIUM 106 TARGET
PHASE SPACE
PROTON REACTIONS
PROTONS
SPACE
SPECTRA
TARGETS