Photon scattering above the giant dipole resonance
Conference
·
· AIP Conf. Proc.; (United States)
OSTI ID:5580435
Several recent experiments which have investigated elastic photon scattering above the GDR are discussed. It is shown how these experiments can provide useful information on the size, energy dependence, and multipolarity of the total photoabsorption cross section. Several examples are given of how one uses the scattering data to study the distribution of E1 and E2 strength in the giant resonance region of light nuclei. For /sup 12/C, /sup 16/O, and /sup 40/Ca, no compact E2 resonance is found between the GDR and 50 MeV, alghough the sum rule is exhausted below 50 MeV in /sup 16/O by a broad distribution of E2 strength. The main concentration of E2 strength seems to lie above 50 MeV in /sup 12/C. For /sup 40/Ca, the data suggest that the integrated E1 absorption per nucleon is closer than previously thought to the nearly constant value found for medium and heavy nuclei. Finally, a brief account is given of the role of exchange effects in medium energy photon scattering, and our present understanding of the experiment on lead is discussed.
- Research Organization:
- University of Illinois, Urbana, IL 61801
- OSTI ID:
- 5580435
- Report Number(s):
- CONF-840906-
- Conference Information:
- Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 125:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
CALCIUM 40 TARGET
CARBON 12 TARGET
CROSS SECTIONS
E1-TRANSITIONS
E2-TRANSITIONS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
MEV RANGE
MEV RANGE 10-100
MULTIPOLE TRANSITIONS
NUCLEAR REACTIONS
OXYGEN 16 TARGET
PHOTONUCLEAR REACTIONS
TARGETS
TOTAL CROSS SECTIONS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
CALCIUM 40 TARGET
CARBON 12 TARGET
CROSS SECTIONS
E1-TRANSITIONS
E2-TRANSITIONS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
MEV RANGE
MEV RANGE 10-100
MULTIPOLE TRANSITIONS
NUCLEAR REACTIONS
OXYGEN 16 TARGET
PHOTONUCLEAR REACTIONS
TARGETS
TOTAL CROSS SECTIONS