Anomalous Scattering of Neutrons by Helium and the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>d</mi><mo>−</mo><mi>d</mi></math></span> Neutron Spectrum

Emmett Hudspeth; Henry Dunlap

doi:10.1103/PhysRev.57.971

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Anomalous Scattering of Neutrons by Helium and the $d - d$ Neutron Spectrum

Emmett Hudspeth and Henry Dunlap

Rice Institute, Houston, Texas

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Phys. Rev. 57, 971 – Published 1 June, 1940

DOI: https://doi.org/10.1103/PhysRev.57.971

Abstract

An investigation of the variation of the ratio of the scattering cross section of neutrons by helium and hydrogen has been made. Neutrons were obtained from a $d - d$ source partly surrounded by 3 cm of paraffin. The anomalously high cross section in helium at 1.0 Mev was found, and the helium-hydrogen cross-section ratio diminishes to about half this maximum value at 1.4 Mev. No other maxima were observed. The $d - d$ neutron spectrum was also investigated by helium recoils. The spectrum appears to be homogeneous; no evidence was found for a low energy group of neutrons with an intensity as great as 1 percent of the main group. This indicates that ${He}^{3}$ is not formed in an excited state.

References (17)

J. H. Williams, W. G. Shepherd and R. O. Haxby, Phys. Rev. 52, 390 (1937) H. Staub and W. E. Stephens, 54, 236 (1938) 54, 237 (1938)
F. Joliot and I. Zlotowski, Comptes rendus 206, 1256 (1938) J. de phys. et rad. 9, 393 (1938)
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T. W. Bonner, Phys. Rev. 52, 685 (1937) ibid.53, 711 (1938)
A. J. Ruhlig, Phys. Rev. 54, 308 (1938) H. Kallmann and E. Kuhn, Naturwiss. 26, 106 (1938) S. Kikuchi and H. Aoki, Proc. Phys.-Math. Soc. Japan 21, 20 (1939)
E. Baldinger, P. Huber and H. Staub, Helv. Phys. Acta 11, 245 (1938)
E. Hudspeth and H. Dunlap, Phys. Rev. 55, 587 (1939)
T. W. Bonner, Nature 143, 681 (1939)
S. Share, Phys. Rev. 53, 875 (1938)
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F. E. Myers and L. M. Langer, Phys. Rev. 54, 90 (1938) E. Hudspeth and T. W. Bonner, 54, 308 (1938)

[c1] J. H. Williams, W. G. Shepherd and R. O. Haxby, Phys. Rev. 52, 390 (1937) H. Staub and W. E. Stephens, 54, 236 (1938) 54, 237 (1938)

[c2] F. Joliot and I. Zlotowski, Comptes rendus 206, 1256 (1938) J. de phys. et rad. 9, 393 (1938)

[c3] H. Staub and W. E. Stephens, Phys. Rev. 55, 131 (1939)

[c4] T. W. Bonner and G. Brubaker, Phys. Rev. 50, 308 (1936)

[c5] T. W. Bonner, Phys. Rev. 52, 685 (1937)

[c6] M. G. Holloway and M. S. Livingston, Phys. Rev. 54, 31 (1938)

[c7] M. S. Livingston and H. A. Bethe, Rev. Mod. Phys. 9, 268 (1938)

[c8] H. Carroll and J. R. Dunning, Phys. Rev. 54, 541 (1938)

[c9] H. A. Bethe and R. F. Bacher, Rev. Mod. Phys. 8, 117 (1936)

[c10] T. W. Bonner, Phys. Rev. 52, 685 (1937) ibid.53, 711 (1938)

[c11] A. J. Ruhlig, Phys. Rev. 54, 308 (1938) H. Kallmann and E. Kuhn, Naturwiss. 26, 106 (1938) S. Kikuchi and H. Aoki, Proc. Phys.-Math. Soc. Japan 21, 20 (1939)

[c12] E. Baldinger, P. Huber and H. Staub, Helv. Phys. Acta 11, 245 (1938)

[c13] E. Hudspeth and H. Dunlap, Phys. Rev. 55, 587 (1939)

[c14] T. W. Bonner, Nature 143, 681 (1939)

[c15] S. Share, Phys. Rev. 53, 875 (1938)

[c16] L. I. Schiff, Phys. Rev. 54, 92 (1938)

[c17] F. E. Myers and L. M. Langer, Phys. Rev. 54, 90 (1938) E. Hudspeth and T. W. Bonner, 54, 308 (1938)

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Anomalous Scattering of Neutrons by Helium and the $d - d$ Neutron Spectrum

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Anomalous Scattering of Neutrons by Helium and the d−d Neutron Spectrum

Abstract

References (17)

Anomalous Scattering of Neutrons by Helium and the $d - d$ Neutron Spectrum