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Response of multistep compound pre-equilibrium reaction cross-sections for the (
p, n ) reactions to forms of optical model parameters- Nuclear Science and Techniques Vol. 28, Issue 10, Article number: 147(2017)
- Affiliations：
1.Department of Physics and Engineering Physics, Obafemi Awolowo University, Ile--Ife, 220005 Nigeria.
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Corresponding author E-mail address: fsolise@oauife.edu.ng;
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DOI：10.1007/s41365-017-0298-4
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Felix S. Olise, Oludaisi I. Oladunjoye, Afis Ajala, et al. Response of multistep compound pre-equilibrium reaction cross-sections for the (
p, n ) reactions to forms of optical model parameters. [J]. Nuclear Science and Techniques 28(10):147(2017)Felix S. Olise, Oludaisi I. Oladunjoye, Afis Ajala, et al. Response of multistep compound pre-equilibrium reaction cross-sections for the (
p, n ) reactions to forms of optical model parameters. [J]. Nuclear Science and Techniques 28(10):147(2017) DOI： 10.1007/s41365-017-0298-4.
摘要
Abstract
In furtherance to improving agreement between calculated and experimental nuclear data, the nuclear reaction code GAMME was used to calculate the multi-step compound (MSC) nucleus double-differential cross-sections (DDCs) for proton-induced neutron emission reactions using the Feshbach-Kerman-Koonin (FKK) formalism. The cross-sections were obtained for reactor structural materials involving ,52,Cr(,p, n,),52,Mn,56,Fe(,p, n,),56,Co and ,60,Ni(,p, n,),60,Cu reactions at 22.2 MeV incident energy using the zero-range reaction mechanism. Effective residual interaction strength was 28 MeV and different optical potential parameters were used for the entrance and exit channels of the proton-neutron interactions. The calculated DDCs were fitted to experimental data at the same backward angle of 150°, where the MSC processes dominate. The calculated and experimental data agree well in the region of pre-equilibrium (MSC) reaction dominance against a weaker fit at the lower emission energies. We attribute underestimations to contributions from the other reaction channels; and disagreement at higher outgoing energies to reactions to collectively excited states. Contrary to the FKK multi-step direct (MSD) calculations, contributions from the higher stages to the DDCs are significant. Different sets of parameters resulted in varying levels of agreement of calculated and experimental data for the considered nuclei.
关键词
Keywords
Proton-neutron interactionMulti-step compound theoryOptical model parametersStructural materialsNuclear reactor facilities
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