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Title: The total neutron cross sections of /sup 249/Bk and /sup 249/Cf below 100 eV

The neutron total cross sections of /sup 249/Bk and /sup 249/Cf have been measured from 0.03 to 100 eV using the Oak Ridge Electron Linear Accelerator as a source of pulsed neutrons. The 1.6-mm-diam cylindrical transmission samples initially contained up to 5.3 mg of 98% /sup 249/Bk and 2% /sup 249/Cf; 4.5 yr later, when the final measurements were made, the composition of the samples had become 2.5% /sup 249/Bk, 96.9% /sup 249/Cf, and 0.6% /sup 245/Cm. Samples were cooled with liquid nitrogen to reduce Doppler broadening. Thirty-nine resonances were identified in /sup 249/Bk and analyzed using a single-level Breit-Wigner formalism. Fifty-five resonances were identified in /sup 249/Cf and analyzed using an R-matrix multilevel formalism. The resonance parameters obtained have been used to determine the average level spacings and the s-wave neutron and fission strength functions. Where possible, bound-level parameters were derived to fit the thermal neutron total cross-section data.
Authors:
; ; ; ;
Publication Date:
OSTI Identifier:
6432154
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nucl. Sci. Eng.; (United States); Journal Volume: 85:3
Research Org:
E.I. du Pont de Nemours and Company, Savannah River Laboratory, Aiken, South Carolina
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BERKELIUM 249 TARGET; NEUTRON REACTIONS; CALIFORNIUM 249 TARGET; TOTAL CROSS SECTIONS; BERKELIUM 249; BREIT-WIGNER FORMULA; CALIFORNIUM 249; CROSS SECTIONS; CURIUM 245; DOPPLER BROADENING; ENERGY LEVELS; ENERGY-LEVEL DENSITY; EV RANGE; ISOTOPE RATIO; MULTILEVEL ANALYSIS; NEUTRON SOURCES; NEUTRON SPECTRA; NITROGEN; ORELA; PULSED NEUTRON TECHNIQUES; RESONANCE; S WAVES; STRENGTH FUNCTIONS; THERMAL NEUTRONS; ACCELERATORS; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; BARYON REACTIONS; BARYONS; BERKELIUM ISOTOPES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CALIFORNIUM ISOTOPES; CURIUM ISOTOPES; DAYS LIVING RADIOISOTOPES; ELEMENTARY PARTICLES; ELEMENTS; ENERGY RANGE; EVEN-ODD NUCLEI; FERMIONS; FUNCTIONS; HADRON REACTIONS; HADRONS; HEAVY NUCLEI; ISOTOPES; LINE BROADENING; LINEAR ACCELERATORS; NEUTRONS; NONMETALS; NUCLEAR REACTIONS; NUCLEI; NUCLEON REACTIONS; NUCLEONS; ODD-EVEN NUCLEI; PARTIAL WAVES; PARTICLE SOURCES; RADIATION SOURCES; RADIOISOTOPES; SPECTRA; TARGETS; YEARS LIVING RADIOISOTOPES 652026* -- Nuclear Properties & Reactions, A=220 & above, Experimental-- Spontaneous & Induced Fission-- (-1987)