Elastic photon scattering from carbon and calcium and its interpretation

Journal Article · Tue Oct 01 04:00:00 EDT 1985 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.32.1174· OSTI ID:5220550

Wright, D H; Debevec, P T; Morford, L J; Nathan, A M

Differential cross sections for the elastic scattering of tagged, monochromatic photons have been measured for targets of carbon and calcium between 19 and 52 MeV. The formalism for the interpretation of these cross sections in terms of the total photoabsorption cross section and its partitioning into E1 and E2 parts is presented. For carbon, we find excellent agreement between the photoabsorption deduced from the scattering and previous direct measurements. The fore-to-aft asymmetries in the cross sections indicate that the bulk of E2 strength is above 50 MeV and not between 30 and 45 MeV, as previously thought. For calcium, the scattering data indicate that the integrated photoabsorption cross sections per nucleon are closer to the nearly constant value reported for A>100 than previously thought. No compact E2 strength exhausting more than 0.5 classical sums is found below 50 MeV, although weaker or less compact strength cannot be ruled out.

• Research Organization: Nuclear Physics Laboratory and Department of Physics, University of Illinois at Urbana-Champaign, Champaign, Illinois 61820
• OSTI ID: 5220550
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 32:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BREMSSTRAHLUNG
CALCIUM 40 TARGET
CARBON 12 TARGET
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
E1-TRANSITIONS
E2-TRANSITIONS
ELASTIC SCATTERING
ELECTROMAGNETIC RADIATION
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
INFORMATION
MEV RANGE
MEV RANGE 10-100
MULTIPOLE TRANSITIONS
NUCLEAR REACTIONS
NUMERICAL DATA
PHOTONUCLEAR REACTIONS
RADIATIONS
SCATTERING
TARGETS
TOTAL CROSS SECTIONS