Photo-Neutron Thresholds of Beryllium and Deuterium

R. C. Mobley and R. A. Laubenstein
Phys. Rev. 80, 309 – Published 1 November 1950
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Abstract

The photo-neutron thresholds of beryllium and deuterium have been measured by comparison with the Li7(p,n) threshold. For this purpose an electrostatic generator was used in which an electron beam and a positive ion beam were established simultaneously. Accurate control and measurement of the generator voltage was obtained by using an electrostatic analyzer on the H2+ component of the ion beam. Because the Li7(p,n) threshold lies between the Be9(γ,n) and D(γ,n) thresholds, errors in extrapolation should be small. The electron beam was accelerated from ground to the accurately known potential of the high voltage electrode where x-rays were produced for the photo-disintegration process. From the photo-neutron thresholds the neutron binding energies of beryllium and deuterium were found to be 1.666±0.002 and 2.226±0.003 Mev, respectively.

  • Received 5 July 1950

DOI:https://doi.org/10.1103/PhysRev.80.309

©1950 American Physical Society

Authors & Affiliations

R. C. Mobley and R. A. Laubenstein

  • University of Wisconsin, Madison, Wisconsin,
  • Argonne National Laboratory, Chicago, Illinois

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Issue

Vol. 80, Iss. 3 — November 1950

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