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

Abstract

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:
Research Org.:
E.I. du Pont de Nemours and Company, Savannah River Laboratory, Aiken, South Carolina
OSTI Identifier:
6432154
Alternate Identifier(s):
OSTI ID: 6432154
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nucl. Sci. Eng.; (United States); Journal Volume: 85:3
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)

Citation Formats

Benjamin, R.W., Carlton, R.F., Harvey, J.A., Hill, N.W., and Pandey, M.S.. The total neutron cross sections of /sup 249/Bk and /sup 249/Cf below 100 eV. United States: N. p., 1983. Web.
Benjamin, R.W., Carlton, R.F., Harvey, J.A., Hill, N.W., & Pandey, M.S.. The total neutron cross sections of /sup 249/Bk and /sup 249/Cf below 100 eV. United States.
Benjamin, R.W., Carlton, R.F., Harvey, J.A., Hill, N.W., and Pandey, M.S.. Tue . "The total neutron cross sections of /sup 249/Bk and /sup 249/Cf below 100 eV". United States. doi:.
@article{osti_6432154,
title = {The total neutron cross sections of /sup 249/Bk and /sup 249/Cf below 100 eV},
author = {Benjamin, R.W. and Carlton, R.F. and Harvey, J.A. and Hill, N.W. and Pandey, M.S.},
abstractNote = {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.},
doi = {},
journal = {Nucl. Sci. Eng.; (United States)},
number = ,
volume = 85:3,
place = {United States},
year = {Tue Nov 01 00:00:00 EST 1983},
month = {Tue Nov 01 00:00:00 EST 1983}
}
  • 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 (ORELA) as a source of pulsed neutrons. The 1.6 mm dia. cylindrical transmission samples contained initially up to 5.3 mg of 98% /sup 249/Bk and 2% /sup 249/Cf: 4.5 years 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 usingmore » a single-level Breit-Wigner formalism. Fifty-five resonances were identified in /sup 249/Cf and analyzed using an R-matrix multilevel 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.« less
  • Total neutron cross sections have been measured for /sup 249/Bk and its ..beta.. decay daughter, /sup 249/Cf. Single level Breit-Wigner resonance analysis has been performed for 35 resonances below 62 eV in Bk and for 10 resonances below 10 eV in Cf. (SDF)
  • Neutron total cross section measurements were performed on a sample of /sup 249/Cf (5.65 mg total weight) with the ORELA as a source of pulsed neutrons. The sample, the inverse thickness of which was 1542 barns/atom, consisted of 85.3% /sup 249/Cf and 14.4% /sup 249/Bk, and was cooled to liquid nitrogen temperature. Analyses were also made of data from a thin sample (l/n = 17430) of 65% /sup 249/Cf in the region of the large fission resonance at 0.7 eV. Fifty-five resonances in /sup 249/Cf were observed and analyzed over the energy range 0.1 eV to 90 eV by usemore » of an R-matrix multilevel formalism. The resonance parameters obtained were used to determine the level spacing and the s-wave neutron and fission strength functions. Thermal total cross section measurements were also performed. 5 figures, 3 tables.« less