Total neutron cross sections of berkelium-249 and californium-249 below 100 eV

Technical Report · Mon Jan 01 00:00:00 EST 1979

OSTI ID:6123615

Benjamin, R W; Harvey, J A; Hill, N W; Pandey, M S; Carlton, R F

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 using 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.

• Research Organization: Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA). Savannah River Lab.; Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC09-76SR00001
• OSTI ID: 6123615
• Report Number(s): DP-MS-83-10; ON: DE83013681
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BERKELIUM 249 TARGET
NEUTRON REACTIONS
CALIFORNIUM 249 TARGET
TOTAL CROSS SECTIONS
BREIT-WIGNER FORMULA
CAPTURE
ENERGY LEVELS
EV RANGE 01-10
EV RANGE 10-100
EXPERIMENTAL DATA
FISSION
LEVEL WIDTHS
RESONANCE
S WAVES
SAMPLE PREPARATION
STRENGTH FUNCTIONS
BARYON REACTIONS
CROSS SECTIONS
DATA
ENERGY RANGE
EV RANGE
FUNCTIONS
HADRON REACTIONS
INFORMATION
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
PARTIAL WAVES
TARGETS
652025* - Nuclear Properties & Reactions
A=220 & above
Experimental- Nuclear Reactions & Scattering- (-1987)
652026 - Nuclear Properties & Reactions
A=220 & above
Experimental- Spontaneous & Induced Fission- (-1987)