A Comparison of the Gamma-Ray Spectra from 2.8-keV Neutron Capture and Thermal-Neutron Capture in Sodium-23
- 12 May 1977
- journal article
- research article
- Published by Taylor & Francis in Nuclear Science and Engineering
- Vol. 63 (1) , 55-62
- https://doi.org/10.13182/nse77-a27004
Abstract
The gamma-ray spectrum resulting from neutron capture in the 2.8-keV resonance of 23Na has been measured with the high-resolution annihilation pair spectrometer at the internal-target facility of the CP-5 reactor. The 2.8-keV resonance was populated by using the boron-shielded target technique: A½-in.-thick filter of 10B surrounding the sodium sample selectively removes low-energy neutrons from the spectrum; the 1/E dependence of the incident neutron flux assures a low intensity of high-energy neutrons. Capture, predominantly in the 2.8-keV resonance, is indicated by a 2- to 3-keV shift in the energies of the primary transitions relative to those observed in thermal-neutron capture. The correlation between the absolute intensities of the resonance transitions and the thermal transitions (measured by others) is computed and discussed in terms of a numerical analysis. (The resonance and thermal intensities are identical within the precision of the measurement.) The results indicate that the resonanc...Keywords
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