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Giant E1 resonance in /sup 1/6O observed with the reaction /sup 1/5N(p,. gamma. /sub 0/)/sup 1/6O

Journal Article · · Phys. Rev., C; (United States)
;
The giant electric dipole resonance based on the ground state (O/sup +/) of /sup 1/6O has been studied with the reaction /sup 1/5N(p, ..gamma../sub 0/)/sup 1/6O from E/sub p/ = 8.6 to 18.0 MeV (E/sub ..gamma../ = 20.2 to 29.0 MeV). The E1 strength in (..gamma.., p/sub 0/) is concentrated between E/sub ..gamma../ = 20 and 29 MeV where it exhausts about 15% of the E1 sum rule. Major peaks are displayed at 22.2 and 25.0 MeV and secondary structure at 21.0, 22.9, and in the 24 MeV region. The angular distributions indicate predominantly dipole radiation and are fairly constant over the entire range, except in the region of the secondary peaks where the coefficient of P/sub 2/(costheta) displays striking interference effects. This behavior supports the suggestion that these structures are due to interference between more complex states and the simple particle-hole configurations of the E1 resonance. The value of the coefficient of P/sub 2/(costheta) can be used to restrict greatly the allowed configurations of the p/sub 0/ channel: the solution is predominantly either d/sub 3/2/ wave or s/sub 1/2/ wave. The presence of terms in p/sub 1/(costheta) indicates significant E2 strength which increases above the E1 resonance. Data are also presented on the reactions /sup 1/5N(p, ..gamma../sub 1/-..gamma../sub 4/)/sup 1/6O and /sup 1/5Np,..cap alpha gamma../sub 15.1/)/sup 1/2C.
Research Organization:
Department of Physics, Stanford University, Stanford, California 94305
OSTI ID:
6928508
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 17:3; 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
ANGULAR DISTRIBUTION
BARYON REACTIONS
CAPTURE
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIPOLES
DISTRIBUTION
ELECTRIC DIPOLES
ENERGY LEVELS
ENERGY RANGE
EQUATIONS
EVEN-EVEN NUCLEI
GAMMA SPECTRA
GIANT RESONANCE
GROUND STATES
HADRON REACTIONS
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
MULTIPOLES
NITROGEN 15 TARGET
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
OXYGEN 16
OXYGEN ISOTOPES
PARTIAL WAVES
PROTON REACTIONS
RESONANCE
SHELL MODELS
SPECTRA
STABLE ISOTOPES
SUM RULES
TARGETS