Energy Spectra and Angular Distribution of Photoneutrons from Carbon

Energy Spectra and Angular Distribution of Photoneutrons from Carbon

Energy spectra and angular distribution of photoneutrons from carbon are studied by irradiation with a 30-Mev bremsstrahlung beam. The spectra exhibit a fine structure from which the following levels in C/sup 12/ may be distinguished: these coincide with levels found in the C/sup 12/( gamma ,p) and...

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Veröffentlicht in:Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, 1960-06, Vol.118 (5), p.1297-1301
Hauptverfasser: Emma, V., Milone, C., Rubbino, A.
Format: Artikel
Sprache:eng
Schlagworte:
ALPHA PARTICLES
ANGULAR DISTRIBUTION
BREMSSTRAHLUNG
CARBON 11
CARBON 12
ENERGY
ENERGY LEVELS
GAMMA RADIATION
INDEPENDENT PARTICLE MODEL
IRRADIATION
MEASURED VALUES
MEV RANGE
MOMENTUM
NEUTRONS
NUCLEAR MODELS
NUCLEAR THEORY
ORBITS
PHOTONEUTRONS
PHOTONS
PHOTOPRODUCTION
PHYSICS
PROTONS
SPECTRA
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Zusammenfassung:Energy spectra and angular distribution of photoneutrons from carbon are studied by irradiation with a 30-Mev bremsstrahlung beam. The spectra exhibit a fine structure from which the following levels in C/sup 12/ may be distinguished: these coincide with levels found in the C/sup 12/( gamma ,p) and C/sup 12/( gamma ,3 alpha ) reactions. Photoneutron emission occurs predominantly by transition to the ground state of C/sup 11/. The angular distribution is of the form 1 + 1.5 sin/sup 2/ theta for all neutrons having energy E/sub n/> 3 Mev. This distribution agrees with that expected according to Wilkinson's independent- particle model for ejection from the 1 = 1 orbit. (auth)
ISSN:0031-899X
DOI:10.1103/PhysRev.118.1297