Determination of the Capture to the Fission Cross-Sections Ratio by the Measurements of the Gamma-Rays Coincidence Multiplicity Spectra at Neutron Resonance Absorption by 235U

Details Determination of the Capture to the Fission Cross-Sections Ratio by the Measurements of the Gamma-Rays Coincidence Multiplicity Spectra at Neutron Resonance Absorption by 235U Determination of the Capture to the Fission Cross-Sections Ratio by the Measurements of the Gamma-Rays Coincidence Multiplicity Spectra at Neutron Resonance Absorption by 235U

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cgrs.conf..676g&link_type=abstract

CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS. Proceedings of the Eleventh International Symposium. Held 2-6 September 2002

Computer Science

Scientific paper

The capture to the fission cross-sections ratio (alpha value) was investigated by the measurements of gamma-rays time-of-flight spectra from the first to fifteenth multiplicities on the 500 m flight path of the IBR-30 reactor. One has used a 16-sections scintillation detector with NaI(Tl) crystals and two metal samples of 0.00137 and 0.00411 at/b thicknesses (the content: 235U :238 U = 90% : 10%.) The multiplicity spectra of coincidence and the alpha values α = σγ/σf were obtained for 212 resolved resonances in the neutron energy region E=19-1260 eV and for energy groups over the range 20-2000 eV. The experimental alpha values were compared with the similar values calculated on a basis of evaluated data from different libraries using the model of neutron cross sections description in multilevel R-matrix approximation.

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