Elsevier

Nuclear Physics A

Volume 252, Issue 2, 10 November 1975, Pages 301-314
Nuclear Physics A

Neutron resonance capture in 138Ba

https://doi.org/10.1016/0375-9474(75)90501-1Get rights and content

Abstract

The neutron capture cross section of 138Ba 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 Γn0and Γγ for ten s-wave levels was found (ϱ = 0.67). The following average resonance parameters were deduced: 〈D〉 = 7.5±1.5 keV, S0 = (0.9±0.4) × 10−4, S1 ≈ 0.5 × 10−4; 〈Γγs = 310±25 meV and 〈Γγp = 47±5 meV. Evidence for a predominant direct capture mechanism for thermal capture is presented.

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Research sponsored in part by USAEC under contract to Union Carbide Corporation.

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