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Absolute measurement of anti. nu. /sub p/ for /sup 252/Cf using the ORNL large liquid scintillator neutron detector

Technical Report ·
DOI:https://doi.org/10.2172/6223355· OSTI ID:6223355
; ;
The ORNL large liquid scintillator detector was used in a precise determination of anti ..nu../sub p/, the number of neutrons emitted promptly, for spontaneous fission of /sup 252/Cf. Measurements of the detector efficiency over a broad energy region were made by means of a proton-recoil technique employing the ORELA white neutron source. Monte Carlo calculation of the detector efficiency for a spectrum representative of /sup 252/Cf fission neutrons was calibrated with these elaborate measurements. The unusually flat response of the neutron detector resulted in elimination of several known sources of error. Experimental measurement was coupled with calculational methods to correct for other known errors. These measurements lead to an unusually small estimated uncertainty of 0.2% in the value obtained, anti ..nu../sub p/ = 3.773 +- 0.007.
Research Organization:
Oak Ridge National Lab., TN (USA)
DOE Contract Number:
W-7405-ENG-26
OSTI ID:
6223355
Report Number(s):
ORNL/TM-7940; ON: DE81030228
Country of Publication:
United States
Language:
English

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Related Subjects

652026* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
BARYONS
CALIBRATION
CALIFORNIUM 252
CALIFORNIUM ISOTOPES
DATA
DATA ACQUISITION SYSTEMS
DECAY
EFFICIENCY
ELEMENTARY PARTICLES
ERRORS
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FERMIONS
FISSION
FISSION NEUTRONS
HADRONS
HEAVY NUCLEI
INFORMATION
ISOTOPES
LIQUID SCINTILLATION DETECTORS
MEASURING INSTRUMENTS
MEASURING METHODS
MONTE CARLO METHOD
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
PROMPT NEUTRONS
RADIATION DETECTORS
RADIOISOTOPES
SCINTILLATION COUNTERS
SPONTANEOUS FISSION
YEARS LIVING RADIOISOTOPES