Partial photonuclear channels and the giant dipole resonance in the {sup 45}Sc nucleus

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · Physics of Atomic Nuclei

OSTI ID:110909

Ishkhanov, B S; Kapitonov, I M; Tutyn`, I A ^[1]

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1. Moscow State Univ. (Russian Federation)

New data on 32 partial channels of the reactions ({gamma},n{sub i}) and ({gamma},p{sub i}) for the {sup 45}Sc nucleus (the subscript i numbers the levels of product nuclei) from a ({gamma},x{gamma}{prime}) experiment make it possible to obtain deeper insight into the mechanism responsible for the formation and decay of the giant dipole resonance (GDR) of 1f2p-shell nuclei. The results of the data analysis are as follows. The E1 transitions of nucleons of the outer (1f2p) shell make a 10% contribution to the photoproton cross section and a 10-20% contribution to the photoneutron cross section. For this GDR branch (1f2p{yields}1g2d3s), a semidirect decay is dominant. However, the GDR of the {sup 45}Sc nucleus is due largely to transitions of nucleons from the inner 1d2s shell. As this GDR branch (1d2s{yields}1f2p) decays mainly through the statistical mechanism, this mechanism prevails for the {sup 45}Sc-nucleus GDR as a whole. The statistical decay mechanism is responsible for 70-90% of the integrated photoabsorption cross section. 21 refs., 2 figs., 2 tabs.

• OSTI ID: 110909
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 7 Vol. 58; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CROSS SECTIONS
E1-TRANSITIONS
GIANT RESONANCE
ISOSPIN
PHOTONUCLEAR REACTIONS
SCANDIUM 45