Interplay of direct and compound-nucleus mechanisms in neutron capture by light nuclides

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:7145189

Raman, S; Kahane, S; Lynn, J E

The authors discuss the direct-capture theory pertaining to primary electric-dipole (E1) transitions following slow-neutron capture. For approximately 20 light nuclides that we have studied, estimates of direct-capture cross sections using optical-model potentials with physically realistic parameters are in reasonable agreement with the data. Minor disagreements that exist are consistent with extrapolations to light nuclides of generally accepted formulations of compound-nucleus capture. In dealing with nuclei soft to vibrations, we have considered the possible effects of coupling of the collective motion with the optical potential in the framework of R-matrix theory. In such cases, we find that the inclusion of inelastic channels results in systematic changes in the calculated cross sections.

• Research Organization: Oak Ridge National Lab., TN (USA); Israel Atomic Energy Commission, Beersheba. Nuclear Research Center-Negev; UKAEA Atomic Energy Research Establishment, Harwell
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7145189
• Report Number(s): CONF-880546-18; ON: DE88011828
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
BARYON REACTIONS
BARYONS
BERYLLIUM 9
BERYLLIUM ISOTOPES
BETA DECAY RADIOISOTOPES
CALCIUM 40
CALCIUM 41
CALCIUM 42
CALCIUM 43
CALCIUM 44
CALCIUM 46
CALCIUM 48
CALCIUM ISOTOPES
CARBON 12
CARBON 13
CARBON ISOTOPES
CROSS SECTIONS
DIRECT REACTIONS
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
FLUORINE 19
FLUORINE ISOTOPES
HADRON REACTIONS
HADRONS
INELASTIC SCATTERING
INTERMEDIATE MASS NUCLEI
ISOTOPES
KNOCK-ON REACTIONS
LIGHT NUCLEI
MAGNESIUM 24
MAGNESIUM 25
MAGNESIUM 26
MAGNESIUM ISOTOPES
NATIONAL ORGANIZATIONS
NEON 20
NEON ISOTOPES
NEUTRON REACTIONS
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
ODD-EVEN NUCLEI
OPTICAL MODELS
ORNL
RADIOISOTOPES
RESEARCH PROGRAMS
SCATTERING
STABLE ISOTOPES
SULFUR 32
SULFUR 33
SULFUR 34
SULFUR 36
SULFUR ISOTOPES
THERMAL NEUTRONS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
YEARS LIVING RADIOISOTOPES