Recent results in the development of a global medium-energy nucleon-nucleus optical-model potential
Initial results are presented for the determination of a global medium-energy nucleon-nucleus phenomenological optical-model potential using a relativistic Schroedinger representation. The starting point for this work is the global phenomenological optical-model potential of Schwandt )ital et al.), which is based on measured elastic scattering cross sections and analyzing power for polarized protons ranging from 80 to 180 MeV. This potential is optimally modified to reproduce experimental proton reaction cross sections as a function of energy, while allowing only minimal deterioration in the fits to the elastic cross sections and analyzing powers. Further modifications in the absorptive potential were found necessary to extrapolate the modified potential to higher energies. The final potential is converted to a neutron-nucleus potential by use of standard Lane model assumptions and by accounting approximately for the Coulomb correction. Comparisons of measured and calculated proton reaction and neutron total cross sections are presented for /sup 27/Al, /sup 56/Fe, and /sup 208/Pb. Medium-energy optical-model potentials for complex projectiles are briefly discussed in an appendix. 7 refs., 20 figs
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5260574
- Report Number(s):
- LA-UR-88-376; CONF-880232-4; ON: DE88006474; TRN: 88-018430
- Resource Relation:
- Conference: Nuclear Energy Agency Nuclear Data Committee (NEANDC) specialists' meeting on preequilibrium nuclear reactions, Semmerling, Austria, 10 Feb 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM 27 TARGET
NEUTRON REACTIONS
PROTON REACTIONS
IRON 56 TARGET
LEAD 208 TARGET
SCHROEDINGER EQUATION
NUCLEAR POTENTIAL
CALCULATION METHODS
CROSS SECTIONS
ELASTIC SCATTERING
BARYON REACTIONS
CHARGED-PARTICLE REACTIONS
DIFFERENTIAL EQUATIONS
EQUATIONS
HADRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
PARTIAL DIFFERENTIAL EQUATIONS
POTENTIALS
SCATTERING
TARGETS
WAVE EQUATIONS
653003* - Nuclear Theory- Nuclear Reactions & Scattering