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Total neutron cross section of scandium from 0. 005 to 22 keV. [Importance of filters for producing 2-keV neutron beams]

Journal Article · · Nucl. Sci. Eng.; (United States)
OSTI ID:6373432
 [1]; ; ;
  1. Brookhaven National Lab., Upton, NY
+ Show Author Affiliations
The size of the neutron cross-section minimum in /sup 45/Sc is important in the optimum design of filters for the production of 2-keV neutron beams. The scandium total cross section was measured from 5 eV to 22 keV, an energy region in which high-resolution and high-precision cross-section data did not previously exist. The samples used are in metallic form having thicknesses ranging from 0.2 to 30.5 cm. The cross section at the (2.05 +- 0.02)-keV minimum is (0.71 +- 0.03) b, in sharp contrast to the previously accepted value, 0.085 b. The size of the cross section indicates that an optimum scandium filter would be shorter than what is conventionally used. An R-function shape fit with constraints from the known thermal cross sections showed that J = 3 scattering dominates at thermal energy, in contradiction to a previous result obtained by polarization techniques. The conclusion is supported by /sup 45/Sc(n,..gamma..) spectra, and the transmission measurements using polarized neutrons and targets. Scandium level parameters were extracted for each observed resonance up to 22 keV. S-wave strength functions and average level spacings were also evaluated for both spin states. 3 figures, 3 tables.
OSTI ID:
6373432
Journal Information:
Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 67:3; ISSN NSENA
Country of Publication:
United States
Language:
English

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Related Subjects

651523 -- Nuclear Properties & Reactions
A=39-58
Experimental-- Energy Levels & Transitions-- (-1987)
651525* -- Nuclear Properties & Reactions
A=39-58
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYON REACTIONS
BARYONS
BEAM PRODUCTION
BEAMS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EPITHERMAL NEUTRONS
EV RANGE
EV RANGE 01-10
EV RANGE 10-100
EV RANGE 100-1000
EXCITATION FUNCTIONS
FERMIONS
FUNCTIONS
HADRON REACTIONS
HADRONS
INTERMEDIATE MASS NUCLEI
INTERMEDIATE NEUTRONS
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KEV RANGE
KEV RANGE 01-10
KEV RANGE 10-100
LEVEL WIDTHS
MATRICES
NEUTRON BEAMS
NEUTRON REACTIONS
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON BEAMS
NUCLEON REACTIONS
NUCLEONS
ODD-ODD NUCLEI
P WAVES
PARTIAL WAVES
PARTICLE BEAMS
PARTICLE PROPERTIES
R MATRIX
RADIOISOTOPES
RESONANCE
S WAVES
SCANDIUM 45 TARGET
SCANDIUM 46
SCANDIUM ISOTOPES
SECONDS LIVING RADIOISOTOPES
SPIN
STRENGTH FUNCTIONS
TARGETS
TOTAL CROSS SECTIONS