Angular Distribution of Photo-Neutrons from Deuterium

Edwin P. Meiners, JR

doi:10.1103/PhysRev.76.259

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Angular Distribution of Photo-Neutrons from Deuterium

Edwin P. Meiners, JR.

Department of Physics, Washington University, St. Louis, Missouri

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Phys. Rev. 76, 259 – Published 15 July, 1949

DOI: https://doi.org/10.1103/PhysRev.76.259

Abstract

A study has been made, using 2.76 Mev ${Na}^{24}$ gamma-rays, of the angular distribution of photo-neutrons from deuterium under approximately ideal conditions of low neutron scattering from the general surroundings into the detector. Results were obtained for two general methods of neutron detection, a B $F_{3}$ chamber and the Szilard-Chalmers reaction on ${C a (M n O_{4})}_{2}$ . Assuming the neutron distribution to have, in the barycentric system, the form $I (θ) = a + b {sin}^{2} θ$ , the values of $\frac{a}{b}$ obtained are 0.212±0.008 for the first method and 0.203±0.040 for the second, giving as a weighted average 0.211±0.008. From this, the ratio of the photomagnetic cross section to the photoelectric cross section is calculated to be 0.317±0.012.

References (13)

Part of dissertation to be presented to the graduate school of Washington University in partial fulfillment of the requirements for the degree of Doctor of Philosophy
H. A. Bethe and R. F. Bacher, Rev. Mod. Phys. 8, 124 (1936)
M. E. Rose and G. Goertzel, Phys. Rev. 72, 749 (1947)
R. E. Bell and L. G. Elliott, Phys. Rev. 74, 1552 (1948)
J. Chadwick and M. Goldhaber, Proc. Roy. Soc. A151, 479 (1935)
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J. R. Richardson and L. Emo, Phys. Rev. 53, 234 (1938)
F. E. Myers and L. C. Van Atta, Phys. Rev. 61, 19 (1942)
H. Halban, Nature 141, 644 (1938)
G. Graham and H. Halban, Rev. Mod. Phys. 17, 297 (1945)
N. O. Lassen, Phys. Rev. 74, 1533 (1948)
R. W. Dodson, M. Goldblatt, and J. H. Sullivan, Los Alamos Scientific Laboratory Report, MDDC 344
R. Wilson, C. H. Collie, and H. Halban, Nature 163, 245 (1949)

[c1] Part of dissertation to be presented to the graduate school of Washington University in partial fulfillment of the requirements for the degree of Doctor of Philosophy

[c2] H. A. Bethe and R. F. Bacher, Rev. Mod. Phys. 8, 124 (1936)

[c3] M. E. Rose and G. Goertzel, Phys. Rev. 72, 749 (1947)

[c4] R. E. Bell and L. G. Elliott, Phys. Rev. 74, 1552 (1948)

[c5] J. Chadwick and M. Goldhaber, Proc. Roy. Soc. A151, 479 (1935)

[c6] J. Chadwick, N. Feather, and E. Bretescher, Proc. Roy. Soc. A163, 366 (1937)

[c7] J. R. Richardson and L. Emo, Phys. Rev. 53, 234 (1938)

[c8] F. E. Myers and L. C. Van Atta, Phys. Rev. 61, 19 (1942)

[c9] H. Halban, Nature 141, 644 (1938)

[c10] G. Graham and H. Halban, Rev. Mod. Phys. 17, 297 (1945)

[c11] N. O. Lassen, Phys. Rev. 74, 1533 (1948)

[c12] R. W. Dodson, M. Goldblatt, and J. H. Sullivan, Los Alamos Scientific Laboratory Report, MDDC 344

[c13] R. Wilson, C. H. Collie, and H. Halban, Nature 163, 245 (1949)

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Angular Distribution of Photo-Neutrons from Deuterium

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