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Strong nonstatistical effects in neutron capture at the 2p size resonance region

Journal Article · · Phys. Rev. C; (United States)
; ;
This paper investigates the nonstatistical effects in radiative neutron capture cross sections for nuclides at the 2p size resonance region of neutron strength function, specifically /sup 27/Al(n,..gamma..) and /sup 28/Si(n,..gamma..) reactions. The neutron energies studied range from thermal up to 2 MeV. The calculated results show that in comparison with medium and heavy nuclei, the nonstatistical fractions in the total capture cross sections for the two lighter nuclides are extremely large. In the thermal energy region, the fractions are about 50%. In the resonance energy region, the averaged contributions from the nonstatistical processes are considerably larger than that from the statistical mechanism. The physical significance of the results was briefly discussed. It was also indicated that this conclusion is qualitatively consistent with the fact that the measured capture data show significant correlations in both nuclides.
Research Organization:
Centre of Theoretical Physics, China Centre of Advanced Science epartment, Fudan University, Shanghai, China
OSTI ID:
6065693
Journal Information:
Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 39:5; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 TARGET
BARYON REACTIONS
CAPTURE
CROSS SECTIONS
DEFORMATION
E1-TRANSITIONS
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
FUNCTIONS
GAMMA RADIATION
HADRON REACTIONS
IONIZING RADIATIONS
MATHEMATICAL MODELS
MATRIX ELEMENTS
MULTIPOLE TRANSITIONS
NEUTRON REACTIONS
NUCLEAR DEFORMATION
NUCLEAR REACTIONS
NUCLEON REACTIONS
OPTICAL MODELS
PARTICLE MODELS
RADIATIONS
SILICON 28 TARGET
SINGLE-PARTICLE MODEL
SPECTROSCOPIC FACTORS
STRENGTH FUNCTIONS
TARGETS
TOTAL CROSS SECTIONS
WAVE FUNCTIONS