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Photon scattering by the giant dipole resonance. [15 to 22 MeV: spectra, cross sections]

Conference ·
OSTI ID:5970227
; ; ; ;
Although many features of the giant dipole resonance are well known, the coupling between the basic dipole oscillation and other nuclear collective degrees of freedom such as surface vibrations and rotations is poorly understood. This aspect was investigated by elastic and inelastic bremsstrahlung scattering of tagged photons over the energy range 15 to 22 MeV. Target nuclei were /sup 60/Ni, /sup 52/Cr, /sup 56/Fe, /sup 92/Mo, and /sup 96/Mo. Scattering and absorption cross sections are tabulated, along with parameters obtained from a two-Lorentzian analysis of the scattering cross sections; measured spectra are shown. It was necessary to remove Thomson scattering from the experimental results. It was found that coupling to surface vibrations in the giant dipole resonance is much weaker than the dynamic collective model suggests. The elastic scattering cross section for all targets but /sup 60/Ni showed structure that is not evident in the absorption cross section measurement. 12 figures, 2 tables. (RWR)
Research Organization:
Argonne National Lab., IL (USA)
Sponsoring Organization:
USDOE
DOE Contract Number:
W-31109-ENG-38
OSTI ID:
5970227
Report Number(s):
CONF-790610--5
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
BREMSSTRAHLUNG
CHROMIUM 52 TARGET
COLLECTIVE MODEL
COUPLING
DATA
DATA FORMS
ELASTIC SCATTERING
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
ENERGY RANGE
EXCITED STATES
EXPERIMENTAL DATA
GIANT RESONANCE
GRAPHS
INELASTIC SCATTERING
INFORMATION
IRON 56 TARGET
ISOLATED VALUES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MOLYBDENUM 92 TARGET
MOLYBDENUM 96 TARGET
NICKEL 60 TARGET
NUCLEAR MODELS
NUCLEAR REACTIONS
NUMERICAL DATA
PHOTONUCLEAR REACTIONS
RADIATIONS
RESONANCE
SCATTERING
TARGETS
VIBRATIONAL STATES