Coherent photon scattering cross sections for helium near the delta resonance

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.43.1525· OSTI ID:5645777

Delli Carpini, D; Booth, E C; Miller, J P ^[1]; Igarashi, R; Bergstrom, J; Caplan, H; Doss, M; Hallin, E; Rangacharyulu, C; Skopik, D ^[2]; Lucas, M A; Nathan, A M; Wells, D P ^[3]

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1. Boston University, Boston, Massachusetts 02215 (US)
2. Saskatchewan Accelerator Laboratory, Saskatoon, Saskatchewan, Canada (CA)
3. University of Illinois, 1110 W. Green Street, Urbana, Illinois 61801 (US)

The angular distributions for coherent photon scattering from {sup 4}He were measured at average laboratory bremsstrahlung energies of 187, 235, and 280 MeV. The experiment was performed at the Saskatchewan Accelerator Laboratory using the new high duty factor electron beam. The scattered photons were observed with a high-resolution NaI(Tl) total absorption scintillation detector. These measurements are intended to investigate modification of the {Delta} properties inside the nuclear medium and the treatment of nonresonant contributions to the scattering cross sections. The results are compared to theoretical calculations in the isobar-hole model. Clear deviations from the theory are evident at all energies, especially at 187 MeV.

• OSTI ID: 5645777
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 43:4; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651220* -- Nuclear Properties & Reactions
A=1-5
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARYONS
COHERENT SCATTERING
CROSS SECTIONS
DELTA BARYONS
DELTA-1232 BARYONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRONS
HELIUM 4 TARGET
ISOBAR MODEL
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
N BARYONS
NUCLEAR REACTIONS
PARTICLE MODELS
PHOTONUCLEAR REACTIONS
SCATTERING
TARGETS