The Absorption of Resonance Neutrons by Boron, Chlorine, Cobalt and Manganese

W. J. Horvath; E. O. Salant

doi:10.1103/PhysRev.59.154

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The Absorption of Resonance Neutrons by Boron, Chlorine, Cobalt and Manganese

W. J. Horvath and E. O. Salant

Department of Physics, New York University, Washington Square, New York, New York

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Phys. Rev. 59, 154 – Published 15 January, 1941

DOI: https://doi.org/10.1103/PhysRev.59.154

Abstract

Measurements are made of the absorption of neutrons by boron and by several elements which capture the neutrons without activity (or with very weak activity). Rh, In, Ag, Mn, Br and I were used as thermal and resonance detectors, and their known boron absorption coefficients were redetermined more carefully. The resonance levels of only Rh and In appeared to be single. It is shown that, by comparing the boron absorption coefficients with the absorption coefficients of the nonradioactive elements, resonance levels of those elements can be located: Resonances are found for ${Cl}^{36}$ near 1 volt, for ${Co}^{58}$ near 1 and 30 volts, for Mn below 0.4 volt. Corrections for nonparallelism of the neutron beam are made semi-empirically and neutron scattering by the absorbers is shown to be quite small compared to neutron capture.

References (15)

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[c1] O. R. Frisch and G. Placzek, Nature 137, 905 (1937) Weekes, Livingston and Bethe, Phys. Rev. 49, 471 (1936) E. Amaldi and E. Fermi, 50, 899 (1936) H. H. Goldsmith and F. Rasetti, 50, 328 (1936) Norling and Fleischman, Zeits. f. Physik 108, 483 (1938)

[c2] E. Wigner and G. Breit, Phys. Rev. 50, 1191 (1936)

[c3] E. Fermi, Ricerca Scient. 7, No. 13 (1936)

[c4] J. G. Hoffman and M. S. Livingston, Phys. Rev. 53, 1020 (1938)

[c5] Hornbostel, Goldsmith and Manley, Phys. Rev. 58, 18 (1940)

[c6] O. R. Frisch, Kgl. Danske Vidensk. Selskab. Math. Phys. Medd. 14, 12 (1937)

[c7] F. Norling and R. Fleischman, Zeits. f. Physik 108, 483 (1938)

[c8] H. H. Goldsmith and J. H. Manley, Phys. Rev. 51, 382A (1937)

[c9] C. P. Baker and R. F. Bacher, Phys. Rev. 57, 1076A (1940)

[c10] J. J. Livingood and G. T. Seaborg, Rev. Mod. Phys. 12, 30 (1940)

[c11] Kikuchi, Takeda, and Ito, Proc. Math.-Phys. Soc. Japan 19, No. 1 (1937)

[c12] J. Risser, Phys. Rev. 52, 768 (1937)

[c13] A. E. Downing and C. D. Ellis, Nature 142, 793 (1938)

[c14] M. Goldhaber and G. H. Briggs, Proc. Roy. Soc. A162, 127 (1937)

[c15] H. Carroll and J. R. Dunning, Phys. Rev. 54, 541 (1938)

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The Absorption of Resonance Neutrons by Boron, Chlorine, Cobalt and Manganese

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