Coriolis interaction and variable reflection asymmetry in fission vibrational resonances

Journal Article · Sat Aug 01 04:00:00 EDT 1987 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.36.671· OSTI ID:6461460

Lynn, J E

A new analysis of the 720 keV gross resonance in the neutron-induced fission cross section of /sup 230/Th has been made. While confirming some of the main conclusions of earlier analyses (such as presence of a double-parity rotational band, suggesting an underlying vibrational mode in a tertiary well of the fission barrier), the new analysis explores additional features of the vibrational model, as well as employing new fission product angular distribution data and treating already available data in a different way. The new model and least squares analysis indicate strong evidence for Coriolis coupling of the K = 1/2 single-particle state and its coupled rotational motion with a K = (3/2 single-particle state and rotational band, probably lying at 930 keV neutron energy. There is also strong evidence that the opposite parity band in the 720 keV gross resonance, which is brought down by the reflection asymmetry in the tertiary potential energy well, is attenuated by a factor of about 3--5 by the fact that reflection asymmetry is not a property expected of the potential energy surface at the inner barrier containing the well.

• Research Organization: Los Alamos National Laboratory, Los Alamos, New Mexico 87544
• OSTI ID: 6461460
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 36:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

653006* -- Nuclear Theory-- Spontaneous & Induced Fission
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ASYMMETRY
BARYON REACTIONS
CORIOLIS FORCE
CROSS SECTIONS
DETECTION
DISTRIBUTION
ENERGY
ENERGY LEVELS
EXCITED STATES
FISSION
FISSION FRAGMENT DETECTION
HADRON REACTIONS
LEAST SQUARE FIT
MATHEMATICAL MODELS
MAXIMUM-LIKELIHOOD FIT
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL SOLUTION
PARITY
PARTICLE MODELS
PARTICLE PROPERTIES
POTENTIAL ENERGY
RADIATION DETECTION
RESONANCE
ROTATIONAL STATES
SINGLE-PARTICLE MODEL
TARGETS
THORIUM 230 TARGET
VIBRATIONAL STATES