Energy spectra and angular distribution of photoneutrons from oxygen
Energy spectra and angular distribution of photoneutrons from oxygen are investigated by irradiation of a water target with a collimated 31 Mev bremsstrahlung beam. Photoneutrons emitted at THETA angles of 30 deg , 60 deg , 90 deg , 120 deg , and 150 deg with a gamma -ray beam are recorded by means of proton recoil tracks in Ilford L-4400 mu m thick photoemulsions. The neutron spectra analysed in 0.5 Mev steps show a fine structure in good agreement with the fine structure found in the proton spectra and in the ( gamma ,n) and ( gamma ,p) cross sections. From these structures many levels of the O/sup 16/ nucleus are identified which are in good agreement with known levels and some levels given with uncertainty are confirmed. For the O/sup 16/( gamma ,n) reaction the contribution of direct process appears prevalent while for all elements up to this date investigated evaporation accounts for the greater part of emitted neutrons. The ground state transitrons amount to at least 60% of the emitted neutrons. The angular distribution of photoneutrons is analyzed separately for single neutron peaks and a back and front asymmetry is found in the region of the giant resonance. Results on the O/sup 16/( gamma ,n) process up to 31 Mev can be interpreted, in good approximation, in terms of a many-level theory for the giant resonance, single-particle transitions and charge independence of nuclear forces.
- Research Organization:
- Universita, Catania, Italy; Centro Siciliano di Fisica Nuclare, Catania, Italy
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-002041
- OSTI ID:
- 4234152
- Journal Information:
- Nuovo Cimento, Journal Name: Nuovo Cimento Journal Issue: 5 Vol. 13; ISSN 0029-6341
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
ANGULAR DISTRIBUTION-- GIANT RESONANCE-- MEASURED VALUES-- OXYGEN 16-- PHOTONEUTRONS-- RESONANCE
ATOMIC MODELS-- ENERGY-- FINE STRUCTURE-- HYPERFINE STRUCTURE-- MEASURED VALUES-- OXYGEN 16-- PHOTONEUTRONS-- SPECTRA
BEAMS-- BREMSSTRAHLUNG-- ENERGY RANGE-- GAMMA RADIATION-- IRRADIATION-- MEASURED VALUES-- OXYGEN 16-- PHOTONEUTRONS-- TARGETS-- WATER
CROSS SECTIONS-- GAMMA RADIATION-- MEASURED VALUES-- NUCLEAR REACTIONS-- OXYGEN 16-- PHOTONEUTRONS-- PHOTOPRODUCTION-- PROTONS
ELECTRIC CHARGES-- ENERGY LEVELS-- GIANT RESONANCE-- MEASURED VALUES-- NUCLEAR MODELS-- OXYGEN 16-- PHOTONEUTRONS-- RESONANCE
ENERGY LEVELS-- MEASURED VALUES-- OXYGEN 16
PHYSICS
ATOMIC MODELS-- ENERGY-- FINE STRUCTURE-- HYPERFINE STRUCTURE-- MEASURED VALUES-- OXYGEN 16-- PHOTONEUTRONS-- SPECTRA
BEAMS-- BREMSSTRAHLUNG-- ENERGY RANGE-- GAMMA RADIATION-- IRRADIATION-- MEASURED VALUES-- OXYGEN 16-- PHOTONEUTRONS-- TARGETS-- WATER
CROSS SECTIONS-- GAMMA RADIATION-- MEASURED VALUES-- NUCLEAR REACTIONS-- OXYGEN 16-- PHOTONEUTRONS-- PHOTOPRODUCTION-- PROTONS
ELECTRIC CHARGES-- ENERGY LEVELS-- GIANT RESONANCE-- MEASURED VALUES-- NUCLEAR MODELS-- OXYGEN 16-- PHOTONEUTRONS-- RESONANCE
ENERGY LEVELS-- MEASURED VALUES-- OXYGEN 16
PHYSICS