Surrogate ratio methodology for the indirect determination of neutron capture cross sections

Journal Article · Sat May 15 00:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.054606· OSTI ID:21389037

Goldblum, B L; Prussin, S G; Bernstein, L A; Younes, W; Guttormsen, M; Nyhus, H T ^[1]

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1. Department of Nuclear Engineering, University of California, Berkeley, California 94720 (United States)

The relative gamma-decay probabilities of the {sup 162}Dy to {sup 161}Dy and {sup 162}Dy to {sup 164}Dy residual nuclei, produced using light-ion-induced direct reactions, were measured as a function of excitation energy using the CACTUS array at the Oslo Cyclotron Laboratory. The external surrogate ratio method (SRM) was used to convert these relative gamma-decay probabilities into the {sup 161}Dy(n,gamma) cross section in an equivalent neutron energy range of 130-560 keV. The directly measured {sup 161}Dy(n,gamma) cross section, obtained from the Evaluated Nuclear Data Files (ENDF/B-VII.0), was compared to the experimentally determined surrogate {sup 161}Dy(n,gamma) cross section obtained using compound-nucleus pairs with both similar ({sup 162}Dy to {sup 164}Dy) and dissimilar ({sup 162}Dy to {sup 161}Dy) nuclear structures. A gamma-ray energy threshold was identified, based upon pairing gap parameters, that provides a first-order correction to the statistical gamma-ray tagging approach and improves the agreement between the surrogate cross-section data and the evaluated result.

• OSTI ID: 21389037
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 81, Issue 5; Other Information: DOI: 10.1103/PhysRevC.81.054606; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CACTI
CAPTURE
COMPOUND NUCLEI
CORRECTIONS
CROSS SECTIONS
DIRECT REACTIONS
DYSPROSIUM 161
DYSPROSIUM 162
DYSPROSIUM 164
EXCITATION
GAMMA DECAY
GAMMA RADIATION
KEV RANGE 100-1000
LIGHT IONS
NEUTRON REACTIONS
NEUTRONS
NUCLEAR DATA COLLECTIONS
NUCLEAR STRUCTURE
OSLO CYCLOTRON
ACCELERATORS
BARYON REACTIONS
BARYONS
CHARGED PARTICLES
CYCLIC ACCELERATORS
CYCLOTRONS
DECAY
DYSPROSIUM ISOTOPES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
HADRON REACTIONS
HADRONS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
IONS
ISOCHRONOUS CYCLOTRONS
ISOTOPES
KEV RANGE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
PLANTS
RADIATIONS
RARE EARTH NUCLEI
STABLE ISOTOPES