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Hadronic photoabsorption and coherent photoproduction of. pi. /sup 0/ mesons in Be and C nuclei in the resonance energy region

Journal Article · · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)
OSTI ID:5186004
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We report the results of new experiments carried out in a tagged photon beam with energy resolution of the tagging-system channels approx. <40 MeV (full width at half-height). The total cross section for photoproduction of hadrons has been measured in Be and C nuclei in the photon energy region E/sub ..gamma../ = 0.2--0.85 GeV. The results, normalized per nucleon, agree within experimental error for C and Be and in the energy region of the second resonance show the presence of a peak. We have also measured the total cross section for photoproduction of ..pi../sup 0/ mesons without charged particles in the final state and the total cross section for photoproduction of ..pi../sup 0/p for determination of the total cross section for coherent photoproduction of ..pi../sup 0/ mesons. It is found that the total cross section for coherent photoproduction of neutral pions decreases strongly for E/sub ..gamma../greater than or equal to400 MeV, approaching zero, which is in good agreement with the predictions of resonance models
Research Organization:
Erevan Physics Institute
OSTI ID:
5186004
Journal Information:
Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 46:2; ISSN SJNCA
Country of Publication:
United States
Language:
English

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Related Subjects

651320* -- Nuclear Properties &amp; Reactions
A=6-19
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BASIC INTERACTIONS
BERYLLIUM 9 TARGET
BOSONS
CARBON 12 TARGET
CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
HADRONS
INTERACTIONS
MESONS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR REACTIONS
PARTICLE PRODUCTION
PHOTONUCLEAR REACTIONS
PHOTOPRODUCTION
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
TARGETS
TOTAL CROSS SECTIONS