Elsevier

Nuclear Physics A

Volume 279, Issue 3, 4 April 1977, Pages 445-453
Nuclear Physics A

Gamma rays from fast neutron capture in silicon and sulphur

https://doi.org/10.1016/0375-9474(77)90578-4Get rights and content

Abstract

Gamma-ray spectra from neutron capture in natural samples of silicon and sulphur have been recorded at several neutron energies between 3.2 and 15 MeV. Time-of-flight techniques have been used to improve the signal-to-background ratio and the γ-radiation has been detected by a large NaI(Tl) scintillator. Cross sections have been determined for transitions to individual (or groups of) levels in the final nuclei. Calculations based on the direct-semidirect model show that this model fails to describe the observed energy dependence of the cross sections in the low-energy range of the giant dipole resonance. The inclusion of the compound-nucleus capture process gives a conclusive improvement in this energy region. A discrepancy in magnitude between observed and calculated cross sections for the reaction 32S(n, γ)33S still persists. Furthermore, the experimental results for 28Si(n, γ)29Si show considerable fluctuations which might be attributed to other non-statistical capture processes.

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