Search for Doubly Radiative np Capture

R. G. Arnold, B. T. Chertok, I. G. Schröder, and J. L. Alberi
Phys. Rev. C 8, 1179 – Published 1 October 1973
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Abstract

We have made a search for doubly radiative np capture n+pγ1+γ2+H2. It has been suggested that this process might contribute to the total np-capture cross section and thus explain the long-standing discrepancy in np capture (σexpt=334.2±0.5 mb and σth=302.5±4.0 mb). Previous np-capture experiments have been insensitive to the energy distribution of the capture γ rays. In this experiment we searched for two-photon events by looking for γ rays in coincidence from a H2O target exposed to a beam of thermal neutrons using two 5×5-cm NaI detectors. Analysis of the coincidence spectra indicates two-photon np-capture events have not been observed. An upper limit at the 3 standard deviation confidence level of σ2γ1.0 mb can be placed on the doubly radiative np-capture cross section. Therefore the two-photon cross section does not explain the discrepancy between the theoretical and experimental np-capture cross sections.

  • Received 17 May 1973

DOI:https://doi.org/10.1103/PhysRevC.8.1179

©1973 American Physical Society

Authors & Affiliations

R. G. Arnold and B. T. Chertok

  • The American University, Washington, D. C. 20016

I. G. Schröder

  • National Bureau of Standards, Washington, D. C. 20234

J. L. Alberi

  • Harvard University, Cambridge, Massachusetts 02138

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Vol. 8, Iss. 4 — October 1973

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