Coulomb and nuclear effects in direct breakup of 54-MeV sup 7 Li+ sup 12 C, sup 197 Au

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.45.2870· OSTI ID:7105761

Mason, J E; Gazes, S B; Roberts, R B; Teichmann, S G ^[1]

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1. Nuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627 (United States)

Direct breakup of {sup 7}Li{r arrow}{alpha}+{ital t} was measured for 54-MeV {sup 7}Li+{sup 12}C, {sup 197}Au reactions. The breakup products were detected in coincidence using a close-geometry detection system, and small scattering angles forward of grazing, were investigated. The direct-breakup cross sections for {sup 12}C ({sup 7}Li, {alpha}{ital t}){sup 12}C{sub g.s.} exhibit significant enhancements beyond predictions of simple {ital E}1 Coulomb-breakup calculations, indicating the importance of the nuclear field. Direct-breakup yields in {sup 197}Au({sup 7}Li,{alpha}{ital t}) quasielastic reactions are sensitive to detector geometry, with the asymptotic fragment energies exhibiting target-proximity effects. Three-body classical trajectory calculations are found to provide qualitative agreement with these observations, provided the projectile is treated as an extended object. These strong Coulomb and nuclear effects severely complicate the extraction of radiative-capture cross sections and low-energy astrophysical {ital S} factors.

• OSTI ID: 7105761
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 45:6; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663520 -- Nuclear Mass Ranges-- A=6-19-- (1992-)
663580 -- Nuclear Mass Ranges-- A=190-219-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BREAKUP REACTIONS
CARBON 12 TARGET
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COINCIDENCE METHODS
COUNTING TECHNIQUES
EVEN-EVEN NUCLEI
GOLD 197 TARGET
HEAVY ION REACTIONS
HELIUM 4
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
LITHIUM 7 REACTIONS
NUCLEAR REACTIONS
NUCLEI
STABLE ISOTOPES
TARGETS
TRITONS