Neutron transmission and capture measurements and analysis of /sup 60/Ni from 1 to 450 keV
High-resolution transmission and capture measurements of /sup 60/Ni-enriched targets have been made at the Oak Ridge Electron Linear Accelerator (ORELA) from a few eV to 1800 keV in transmission and from 2.5 keV to 5 MeV in capture . The transmission data from 1 to 450 keV were analyzed with a multi-level R-matrix code which uses the Bayes' theorem for the fitting process. This code provides the energies and neutron widths of the resonances inside the 1- to 450-keV region as well as a possible parameterization for outside resonances to describe the smooth cross section in this region. The capture data were analyzed with a least-squares fitting code using the Breit-Wigner formula. From 2.5 to 450 keV, 166 resonances were seen in both sets of data. Correspondence between the energy scales shows a discontinuity around 300 keV which makes the matching of resonances at higher energies difficult. Eighty-nine resonances were seen in the capture data only. Average parameters for the 30 observed s-wave resonances were deduced. The average level spacing D/sub 0/ was found to be equal to 15.2 +- 1.5 keV, the strength function, S/sub 0/, equal to (2.2 +- 0.6) x 10/sup -4/ and the average radiation width, GAMMA/sub ..gamma../, equal to 1.30 +- 0.07 eV. The staircase plot of the reduced level widths and the plot of the Lorentz-weighted strength function averaged over various energy intervals show possible evidence for doorway states. The level densities calculated with the Fermi-gas model for l = 0 and for l > 0 resonances were compared with the cumulative number of observed resonances, but the analysis is not conclusive. The average capture cross section as a function of the neutron incident energy is compared to the tail of the giant electric dipole resonance prediction.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6711144
- Report Number(s):
- ORNL-5893; ENDF-330; ON: DE83003190
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NEUTRON REACTIONS
CAPTURE
NEUTRONS
TRANSMISSION
NICKEL
NEUTRON TRANSPORT
NICKEL 60 TARGET
BREIT-WIGNER FORMULA
COMPUTER CALCULATIONS
CROSS SECTIONS
DATA ANALYSIS
ENERGY DEPENDENCE
ENERGY-LEVEL DENSITY
EXPERIMENTAL DATA
GIANT RESONANCE
KEV RANGE
LEVEL WIDTHS
MEV RANGE 01-10
R MATRIX
RESONANCE
S WAVES
STRENGTH FUNCTIONS
BARYON REACTIONS
BARYONS
DATA
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
FUNCTIONS
HADRON REACTIONS
HADRONS
INFORMATION
MATRICES
METALS
MEV RANGE
NEUTRAL-PARTICLE TRANSPORT
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
NUMERICAL DATA
PARTIAL WAVES
RADIATION TRANSPORT
TARGETS
TRANSITION ELEMENTS
651625* - Nuclear Properties & Reactions
A=59-89
Experimental- Nuclear Reactions & Scattering- (-1987)
654003 - Radiation & Shielding Physics- Neutron Interactions with Matter