Elastic photon scattering in light nuclei

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5667786

Wright, D H

Elastic photon scattering cross sections were measured for carbon and calcium between 19 and 52 MeV, and at three scattering angles, 135, 90, and 45/sup 0/. The absolute uncertainty in these measurements is less than 7.5%. The E1 total cross section deduced from the carbon scattering data agrees with existing photoabsorption measurements up to 28 MeV, but not between 28 and 45 MeV. Between 22 and 35 MeV, the carbon scattering data show no evidence for large concentrations of E2 strength. This contradicts a previous result claiming the presence of E2 strength consuming 2.7 total sums. The present data suggest a large E2 concentration, consuming 1.5 total sums, at 58 MeV, near the predicted energy of the isovector E2 resonance. The value of the total cross section for carbon at 22.9 MeV was measured to be 19.6 +/- 0.8 mb, in good agreement with a previous measurement. The E1 total cross section deduced from the calcium scattering data is inconsistent with existing photoabsorption measurements below 45 MeV. Between 19 and 50 MeV in calcium, no large concentration of E2 strength was found. The value of the total cross section for calcium at 19.4 MeV was measured to be 88.5 + 4.4 mb, 5% lower than a previous measurement.

• Research Organization: Illinois Univ., Urbana (USA)
• OSTI ID: 5667786
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH METALS
ANGULAR DISTRIBUTION
CALCIUM
CARBON
CROSS SECTIONS
DATA
DISTRIBUTION
E1-TRANSITIONS
E2-TRANSITIONS
ELEMENTS
ENERGY DEPENDENCE
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
FUNCTIONS
INFORMATION
METALS
MEV RANGE
MEV RANGE 10-100
MULTIPOLE TRANSITIONS
NONMETALS
NUCLEAR REACTIONS
NUMERICAL DATA
PHOTONUCLEAR REACTIONS
SCATTERING
STRENGTH FUNCTIONS