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Giant E1 resonances in /sup 8/Be from the reaction /sup 7/Li(p,. gamma. )/sup 8/Be

Journal Article · · Phys. Rev., C; (United States)
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The giant electric dipole resonances based on the ground state (0/sup +/) and first excited state (2/sup +/) of /sup 8/Be have been studied with the reactions /sup 7/Li(p, ..gamma../sub 0/)/sup 8/Be and /sup 7/Li(p, ..gamma../sub 1/)/sup 8/Be over the range E/subp/ = 0.8 to 17.6 MeV. Both resonances show a simple resonant shape with little fine structure. The ..gamma../sub 1/ giant resonance is displaced upward from the ..gamma../sub 0/ resonance by an energy of 2.2 MeV which is approximately equal to the excitation of the 2/sup +/ state. The reduced (..gamma.., p/sub 0/) strength of the two resonances are approximately equal and each exhausts about 10% of the E1 sum rule. The angular distributions for both ..gamma../sub 0/ and ..gamma../sub 1/ are quite constant over the giant resonance structure and are predominantly dipole in character. A simple model can be invoked to explain the dominant E1 features. The presence of P/sub 1/(costheta) and P/sub 3/(costheta) terms in both angular distributions indicates E2 strength which probably increases above the E1 resonances. Some parameters for the narrow levels at 18.15 and 19.06 MeV in /sup 8/Be are given. (AIP)
Research Organization:
Department of Physics, Stanford University, Stanford, California 94305
OSTI ID:
7187226
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 14:1; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

651323* -- Nuclear Properties & Reactions
A=6-19
Experimental-- Energy Levels & Transitions-- (-1987)
651325 -- Nuclear Properties & Reactions
A=6-19
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
ANGULAR DISTRIBUTION
BARYON REACTIONS
BERYLLIUM 8
BERYLLIUM ISOTOPES
CAPTURE
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DIPOLES
DISTRIBUTION
ELECTRIC DIPOLES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXCITED STATES
GAMMA SPECTRA
GROUND STATES
HADRON REACTIONS
ISOTOPES
LIGHT NUCLEI
LITHIUM 7 TARGET
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
MULTIPOLES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
PROTON REACTIONS
RADIOISOTOPES
RESONANCE
SECONDS LIVING RADIOISOTOPES
SPECTRA
TARGETS