Ultradipole photon production in 40 and 50 MeV [alpha]-nucleus collisions

Journal Article · Wed Dec 01 04:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.48.2845· OSTI ID:5574919

Sharan, M K; Agarwal, Y K; Baba, C V.K. ^[1]; Chakrabarty, D R; Datar, V M ^[2]

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1. Tata Institute of Fundamental Research, Bombay 400 005 (India)
2. Nuclear Physics Division, Bhabha Atomic Research Centre, Bombay 400 085 (India)

[gamma]-ray yields in the energy range [similar to]5--35 MeV have been measured in the reactions [alpha]+[sup 197]Au and [sup 159]Tb at [ital E][sub [alpha]]=40 MeV and [alpha]+[sup 197]Au, [sup 116]Sn, [sup nat]Ag, and [sup 59]Co at [ital E][sub [alpha]]=50 MeV at [theta][sub [gamma]]=90[degree]. Angular distribution measurements have been carried out for the heaviest and the lightest target at [ital E][sub [alpha]]=50 MeV. A reasonably good agreement with the statistical model calculations is obtained for photon energies up to the giant dipole resonance region. A nonstatistical component is observed at higher [gamma]-ray energies for all the systems studied. An attempt to understand the production mechanism of the nonstatistical part is made in terms of the potential bremsstrahlung and the incoherent nucleon-nucleon bremsstrahlung processes. While the calculations give the right order of magnitude of the measured cross sections for the highest [gamma]-ray energies, they fail to reproduce the measured angular distributions and the cross sections in the entire [gamma]-ray energy range.

• OSTI ID: 5574919
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 48:6; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
ANGULAR DISTRIBUTION
BREMSSTRAHLUNG
CHARGED-PARTICLE REACTIONS
COBALT 59 TARGET
CROSS SECTIONS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ENERGY RANGE
GAMMA SPECTROSCOPY
GIANT RESONANCE
GOLD 197 TARGET
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NUCLEAR REACTIONS
RADIATIONS
RESONANCE
SILVER 107 TARGET
SPECTROSCOPY
STATISTICAL MODELS
TARGETS
TERBIUM 159 TARGET
TIN 116 TARGET