Direct thermal neutron capture

Conference · Thu Jan 01 04:00:00 EST 1987

DOI:https://doi.org/10.1088/0305-4616/14/S/024· OSTI ID:6083778

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

We discuss the direct-capture theory pertaining to primary electric dipole (E1) transitions following slow-neutron capture. For light nuclides that we have studied (including /sup 9/Be, /sup 12/C, /sup 13/C, /sup 24/Mg, /sup 25/Mg, /sup 26/Mg, /sup 32/S, /sup 33/S, /sup 34/S, /sup 40/Ca, and /sup 44/Ca), 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. We also discuss the channel-capture approximation which is, in general, a good representation of these cross sections in heavier nuclei particularly if the scattering lengths are not different from the corresponding potential radii. We also draw attention to cases where the use of this formula leads to inaccurate predictions. 9 refs., 1 fig., 2 tab.

• Research Organization: Oak Ridge National Lab., TN (USA); Los Alamos National Lab., NM (USA)
• DOE Contract Number: AC05-84OR21400; W-7405-ENG-36
• OSTI ID: 6083778
• Report Number(s): LA-UR-87-3191; CONF-8708101-12; ON: DE88000489
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
BARYON REACTIONS
BERYLLIUM 9 TARGET
CALCIUM ISOTOPES
CAPTURE
CARBON ISOTOPES
CROSS SECTIONS
DATA
E1-TRANSITIONS
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
HADRON REACTIONS
INFORMATION
ISOTOPES
MAGNESIUM ISOTOPES
MULTIPOLE TRANSITIONS
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
OPTICAL MODELS
SULFUR ISOTOPES
TARGETS