Neutron resonance capture in $sup 138$Ba
Journal Article
·
· Nucl. Phys., A, v. 252, no. 2, pp. 301-314
OSTI ID:4100253
The neutron capture cross section of $sup 138$Ba has been measured with high resolution to 100 keV, and resonance parameters have been extracted. A number of new levels are observed. The s-wave radiative width is found to be six times the p-wave radiative width, and is also considerably larger than for other nuclei in this mass region. Valence capture and enhanced decay to single- particle final states could account for the large s-wave radiative strength. A large positive correlation between GAMMA/sub n/$sup 0$ and GAMMA/sub $gamma$/ for ten s-wave levels was found (rho = 0.67). The following average resonance parameters were deduced: [D] = 7.5 +- 1.5 keV, S$sub 0$ = (0.9 +- 0.4) x 10$sup - 4$, S$sub 1$ approximately equal to 0.5 x 10$sup -4$; [GAMMA/sub $gamma$/]/sub s/ = 310 +- 25 MeV and [GAMMA/sub $gamma$/]/sub p/ = 47 +- 5 MeV. Evidence for a predominant direct capture mechanism for thermal capture is presented. (NL)
- Research Organization:
- Australian Atomic Energy Commission Research Establishment, Lucas Heights); (Oak Ridge National Lab., Tenn. (USA)
- NSA Number:
- NSA-33-019047
- OSTI ID:
- 4100253
- Journal Information:
- Nucl. Phys., A, v. 252, no. 2, pp. 301-314, Journal Name: Nucl. Phys., A, v. 252, no. 2, pp. 301-314; ISSN NUPAB
- Country of Publication:
- Netherlands
- Language:
- English
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Related Subjects
642805*
ANGULAR MOMENTUM-- BARIUM 138-- CAPTURE- - DIRECT REACTIONS-- EXCITATION FUNCTIONS-- GAMMA RADIATION-- INTERMEDIATE NEUTRONS-- KEV RANGE 01-10-- KEV RANGE 10-100-- NEUTRON REACTIONS-- NUCLEAR REACTION KINETICS-- THERMAL NEUTRONS
LEVEL WIDTHS
N68731 --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
90 <= A <= 149--Energy Levels & Transitions
N68751* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
90 <= A <= 149--Nuclear Reactions & Scattering
P WAVES
RESONANCE
S WAVES ENERGY LEVELS
ANGULAR MOMENTUM-- BARIUM 138-- CAPTURE- - DIRECT REACTIONS-- EXCITATION FUNCTIONS-- GAMMA RADIATION-- INTERMEDIATE NEUTRONS-- KEV RANGE 01-10-- KEV RANGE 10-100-- NEUTRON REACTIONS-- NUCLEAR REACTION KINETICS-- THERMAL NEUTRONS
LEVEL WIDTHS
N68731 --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
90 <= A <= 149--Energy Levels & Transitions
N68751* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
90 <= A <= 149--Nuclear Reactions & Scattering
P WAVES
RESONANCE
S WAVES ENERGY LEVELS