Measurement of the average number of prompt neutrons emitted per fission of /sup 235/U relative to /sup 252/Cf for the energy region 500 eV to 10 MeV

Technical Report · Tue Jan 01 00:00:00 EST 1980

DOI:https://doi.org/10.2172/5519909· OSTI ID:5519909

Gwin, R.; Spencer, R. R.; Ingle, R. W.; Todd, J. H.; Weaver, H.

The average number of prompt neutrons emitted per fission ..nu../sub p/-bar(E), was measured for /sup 235/U relative to ..nu../sub p/-bar for the spontaneous fission of /sup 252/Cf over the neutron energy range from 500 eV to 10 MeV. The samples of /sup 235/U and /sup 252/Cf were contained in fission chambers located in the center of a large liquid scintillator. Fission neutrons were detected by the large liquid scintillator. The present values of ..nu../sub p/-bar(E) for /sup 235/U are about 0.8% larger than those measured by Boldeman. In earlier work with the present system, it was noted that Boldeman's value of ..nu../sub p/-bar(E) for thermal energy neutrons was about 0.8% lower than obtained at ORELA. It is suggested that the thickness of the fission foil used in Boldeman's experiment may cause some of the discrepancy between his and the present values of ..nu../sub p/-bar(E). For the energy region up to 700 keV, the present values of ..nu../sub p/-bar(E) for /sup 235/U agree, within the uncertainty, with those given in ENDF/B-V. Above 1 MeV the present results for ..nu../sub p/-bar(E) range about the ENDF/B-V values with differences up to 1.3%. 6 figures, 1 table.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5519909
• Report Number(s): ORNL/TM-7148; ENDF-289; TRN: 80-004845
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
NEUTRON REACTIONS
PROMPT NEUTRONS
MULTIPLICITY
URANIUM 235 TARGET
CORRECTIONS
ERRORS
EV RANGE 100-1000
EXPERIMENTAL DATA
FAST NEUTRONS
FISSION
GRAPHS
INTERMEDIATE NEUTRONS
KEV RANGE 01-10
KEV RANGE 10-100
KEV RANGE 100-1000
MEV RANGE 01-10
BARYON REACTIONS
BARYONS
DATA
DATA FORMS
ELEMENTARY PARTICLES
ENERGY RANGE
EV RANGE
FERMIONS
FISSION NEUTRONS
HADRON REACTIONS
HADRONS
INFORMATION
KEV RANGE
MEV RANGE
NEUTRONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
NUMERICAL DATA
TARGETS
652026* - Nuclear Properties & Reactions
A=220 & above
Experimental- Spontaneous & Induced Fission- (-1987)