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Theoretical calculation of UFttmsigma/sub n/,. gamma. (E) for several types of nuclei

Journal Article · · Chin. Phys.; (United States)
OSTI ID:5390311
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Theoretical calculation of sigma/sub n/,..gamma..(E) for several types of nuclei including spherical nuclei (/sup 89/Y,/sup 88/Y), nuclei with low lying vibrational modes (/sup 197/Au,/sup 196/Au) and nuclei with large deformation (/sup 169/Tm,/sup 181/Ta) has been performed with the incident neutron energy in the range of 0.1 keV to 3 MeV. The calculation is made to examine for different types of nuclei the validity of Hauser-Feshbach theory with width fluctuation correction, the method of evaluation of the neutron transmission coefficient by means of the optical model potential, and the method of evaluation of the photon strength function by means of the giant dipole resonance (GDR) model. It is found that, (1) Rather good estimate of sigma/sub n/,..gamma..(E) can be obtained provided the photon strength function is property evaluated. (2) The calculation of sigma/sub n/,..gamma..(E) is not sensitive to the optical model potential parameters especially for spherical nuclei. (3) For nuclei with low lying vibration modes and nuclei with large deformation, fairly successful prediction for sigma/sub n/,..gamma..(E) can be made with single channel spherical potential. (4) It is essential to use a Lorentzian curve for the photo-absorption cross section which fits well the experimental data near and below the neutron threshold. (5) For nuclei whose energy spectra are not well understood, one has to discretize the ''continuous spectra'' obtained from some level density formula. The validity of this procedure is tested for /sup 197/Au where sufficient data of the low energy spectra is available.
Research Organization:
Department of Physics, Peking University, Beijing
OSTI ID:
5390311
Journal Information:
Chin. Phys.; (United States), Journal Name: Chin. Phys.; (United States) Vol. 2:3; ISSN CHPHD
Country of Publication:
United States
Language:
English

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Related Subjects

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
CAPTURE
CROSS SECTIONS
DATA
ENERGY LEVELS
ENERGY RANGE
EXCITED STATES
EXPERIMENTAL DATA
FUNCTIONS
GOLD 196 TARGET
GOLD 197 TARGET
HADRON REACTIONS
HAUSER-FESHBACH THEORY
INFORMATION
KEV RANGE
KEV RANGE 100-1000
MEV RANGE
MEV RANGE 01-10
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEON REACTIONS
NUMERICAL DATA
OPTICAL MODELS
STRENGTH FUNCTIONS
TANTALUM 181 TARGET
TARGETS
THULIUM 169 TARGET
VIBRATIONAL STATES
YTTRIUM 88 TARGET
YTTRIUM 89 TARGET