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Unique /sup 6/Li-nucleus optical potentials from elastic scattering of 210 MeV /sup 6/Li ions by /sup 28/Si, /sup 40/Ca, /sup 90/Zr, and /sup 208/Pb

Journal Article · · Phys. Rev. C; (United States)
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Differential cross sections for the elastic scattering of /sup 6/Li ions have been measured at a bombarding energy of 210 MeV. Angular distributions for /sup 28/Si (3.6/sup 0/--45.9/sup 0/), /sup 40/Ca (4.6/sup 0/--43.5/sup 0/), and /sup 90/Zr (4.0/sup 0/--43.6/sup 0/) extend sufficiently into the rainbow region to enable the extraction of unique /sup 6/Li potentials. For the /sup 208/Pb target (3.1/sup 0/--36.0/sup 0/), Coulomb scattering dominates with only a slight evidence of nuclear diffraction at the largest angles. The data were analyzed in terms of a six-parameter phenomenological optical-model potential with Woods-Saxon form factors. The unique potentials obtained show a weak target-mass dependence, which allowed the prediction of /sup 208/Pb potential parameters. Using the present results and lower energy analyses, an energy dependence for the /sup 6/Li-nucleus potentials was derived. For all targets, the volume integral per nucleon pair of the real potential seems to satisfy a logarithmic energy dependence of the form J/sub R//6A = J/sup 0//sub R//6A-..beta.. ln E/sub lab/ with J/sub R//sup 0//6A = 830 +- 30 MeV fm/sup 3/ and ..beta.. = 105 +- 5 MeV fm/sup 3/. This result is consistent with elastic scattering of other light ions. By truncating the angular distributions for the lighter targets up to the rainbow angle, several discrete potentials, corresponding to the different families found at lower energies, were obtained.

Research Organization:
University of Michigan, Dearborn, Michigan 48128
OSTI ID:
6530055
Journal Information:
Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 39:2; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

651420* -- Nuclear Properties & Reactions
A=20-38
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651520 -- Nuclear Properties & Reactions
A=39-58
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651720 -- Nuclear Properties & Reactions
A=90-149
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653001 -- Nuclear Theory-- Nuclear Structure
Moments
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BASIC INTERACTIONS
CALCIUM 40 TARGET
CHARGED-PARTICLE REACTIONS
COULOMB SCATTERING
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ENERGY DEPENDENCE
ENERGY RANGE
EXPERIMENTAL DATA
FORM FACTORS
HEAVY ION REACTIONS
INFORMATION
INTERACTIONS
LEAD 208 TARGET
LITHIUM 6 REACTIONS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUMERICAL DATA
OPTICAL MODELS
PARTICLE PROPERTIES
POTENTIALS
SCATTERING
SILICON 28 TARGET
TARGETS
WOODS-SAXON POTENTIAL
ZIRCONIUM 90 TARGET