Analysis of partial photonucleon cross sections on the basis of the widths of semidirect decay of a collective dipole state

Journal Article · Thu Oct 31 23:00:00 EST 1985 · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)

OSTI ID:5889692

Arzibekov, U R; Gabelko, A S; Zhalilov, M K; Irgashev, K M; Ishkhanov, B S; Kapitonov, I M; Orlin, V N; Piskarev, I M

A method has been developed for analysis of partial photonucleon cross sections (cross sections of the reactions (..gamma.., p/sub i/) and (..gamma.., n/sub i/), where the subscript i indicates the final-nucleus state being populated) which permits extraction from them of information on the probability of the semidirect mechanism of decay of the giant dipole resonance. The method utilizes experimental data on partial photonucleon cross sections, spectroscopic characteristics of the states populated from reactions of one-nucleon transfer, and expressions for the widths of semidirect decay of giant dipole resonances following from the R-matrix theory. The possibilities of the method are illustrated in a specific example: partial photonucleon cross sections for the nucleus/sup 27/ Al. It is established that for this nucleus the probability of the semidirect mechanism of decay of the giant dipole resonance in the (..gamma..,p) channel is 0.38--0.45, and in the (..gamma.., n) channel it is 0.90. The method permits estimates to be obtained for the partial photonucleon cross sections for population of the lowest states of the final nuclei.

• Research Organization: Institute of Nuclear Physics of Moscow State University
• OSTI ID: 5889692
• Journal Information: Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 42:5; ISSN SJNCA
• Country of Publication: United States
• Language: English

Related Subjects

651415* -- Nuclear Properties & Reactions
A=20-38
Theoretical-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 TARGET
BARYONS
BASIC INTERACTIONS
CROSS SECTIONS
DECAY
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
GIANT RESONANCE
HADRONS
INTERACTIONS
NUCLEAR REACTIONS
NUCLEONS
PARTICLE PRODUCTION
PHOTONUCLEAR REACTIONS
PHOTONUCLEONS
PHOTOPRODUCTION
RESONANCE
TARGETS