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/sup 58/Ni + n transmission, differential elastic scattering and capture measurements and analysis from 5 to 813 keV

Technical Report ·
DOI:https://doi.org/10.2172/6721513· OSTI ID:6721513
; ; ; ; ;
High-resolution neutron measurements for /sup 58/Ni-enriched targets were made at the Oak Ridge Electron Linear Accelerator (ORELA) from 100 eV to approx.20 MeV in transmission, from 10 keV to 5 MeV in differential elastic, and from 2.5 keV to 5 MeV in capture. The transmission data were analyzed from 10 to 813 keV with the multilevel R-matrix code SAMMY which uses Bayes' theorem for the fitting process. This code provides energies and neutron widths of the resonances inside the 10- to 813-keV region as well as a possible parameterization for resonances external to that region to describe the smooth cross section from 10 to 813 keV. The differential elastic data at different scattering angles were compared to theoretical calculations from 30 to 813 keV using an R-matrix code based on the Blatt-Biedenharn formalism. Various combinations of spin and parity were tried to predict cross sections for the well defined /ell/ > 0 resonances, and comparison with the data then provided spin and parity assignments for most of these resonances. the capture data were analyzed from 5 to 450 keV with a least-squares fitting code using the Breit-Wigner formula. In this energy region 30% more resonances were observed in the capture data than in the transmission data. 55 refs., 44 figs., 3 tabs.
Research Organization:
Oak Ridge National Lab., TN (USA)
DOE Contract Number:
AC05-84OR21400
OSTI ID:
6721513
Report Number(s):
ORNL/TM-10841; ENDF-347; ON: DE89001958
Country of Publication:
United States
Language:
English

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Related Subjects

651520* -- Nuclear Properties & Reactions
A=39-58
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
CROSS SECTIONS
DATA
DATA ACQUISITION SYSTEMS
DATA ANALYSIS
DATA PROCESSING
ELASTIC SCATTERING
EXPERIMENTAL DATA
HADRON REACTIONS
INFORMATION
NEUTRON REACTIONS
NICKEL 58 TARGET
NUCLEAR DATA COLLECTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
PARTIAL WAVES
PROCESSING
S WAVES
SCATTERING
TARGETS