Statistical tests for the detection of intermediate structure: Application to the structure of the /sup 238/U neutron capture cross section between 5 keV and 0. 1 MeV

Journal Article · Wed Aug 01 00:00:00 EDT 1979 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.20.528· OSTI ID:6125019

Perez, R B; de Saussure, G; Macklin, R L; Halperin, J

Recent measurements of the /sup 238/U neutron capture cross section show a considerable amount of fluctuation between 5 and 100 keV. Statistical tests performed on the measured cross section suggest that the fluctuations are not compatible with the statistical model of nuclear reactions and imply the existence of intermediate structure, which is interpreted in terms of doorway states. The validity of the statistical tests used here is confirmed by numerical experiments with simulated cross sections generated by the Monte Carlo method, in accordance with the statistical method. The behavior of the capture cross section is compared to those of the subthreshold fission cross section and of the inelastic scattering cross section. The threshold anomaly at the opening of the inelastic channel at 45 keV is seen in the form of a rounded step.

• Research Organization: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• OSTI ID: 6125019
• Journal Information: Phys. Rev., C; (United States), Vol. 20:2
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
NEUTRON REACTIONS
CAPTURE
FISSION
INELASTIC SCATTERING
URANIUM 238 TARGET
CROSS SECTIONS
GAMMA SPECTRA
INTERMEDIATE STRUCTURE
MONTE CARLO METHOD
NUCLEAR STRUCTURE
OPTICAL MODELS
STATISTICAL MODELS
BARYON REACTIONS
HADRON REACTIONS
MATHEMATICAL MODELS
NUCLEAR REACTIONS
NUCLEON REACTIONS
SCATTERING
SPECTRA
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)