A Cloud-Chamber Study of the Scattering of Fast Neutrons in Oxygen

J. P. Conner

doi:10.1103/PhysRev.89.712

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A Cloud-Chamber Study of the Scattering of Fast Neutrons in Oxygen

J. P. Conner^*

Rice Institute, Houston, Texas

^*U. S. Atomic Energy Commission Predoctoral Fellow. Present address: Physics Division, Los Alamos Scientific Laboratory, Los Alamos, New Mexico.

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Phys. Rev. 89, 712 – Published 15 February, 1953

DOI: https://doi.org/10.1103/PhysRev.89.712

Abstract

Neutrons with an energy of 14.1 Mev have been scattered in oxygen gas, and the recoil oxygen nuclei observed in a cloud chamber operated at a pressure of $\frac{1}{5}$ atmosphere. Recoils from elastically scattered neutrons were resolved from recoils due to inelastic scattering. The results indicate a strong asymmetry in the angular distribution of elastically scattered neutrons; the angular distribution has maxima at 0°, 80°, and 180° and minima at 60° and 130°. Within a factor of 2, the angular distribution for the inelastically scattered neutrons is symmetrical. The probability per unit energy interval that the oxygen nucleus will be left excited is about 5 times as large at 6-Mev excitation as at 12-Mev.

The cross section of oxygen for 14.1-Mev neutrons is 0.7× $10^{- 24}$ ${cm}^{2}$ for elastic scattering, 0.5× $10^{- 24}$ ${cm}^{2}$ for inelastic scattering, and 0.4× $10^{- 24}$ ${cm}^{2}$ for disintegration.

References (11)

A. B. Lillie and J. P. Conner, Rev. Sci. Instr. 22, 210 (1951)
H. A. Bethe, Revs. Modern Phys. 22, 213 (1950)
Hornyak, Lauritsen, Morrison, and Fowler, Revs. Modern Phys. 22, 291 (1950)
A. B. Lillie, Phys. Rev. 87, 716 (1952)
C. M. Crenshaw, Phys. Rev. 62, 54 (1942)
Amaldi, Bocciarelli, Cacciapuoti, and Trabacchi, Nuovo cimento 3, 15 and 203 (1946) International Conference on Fundamental Particles, Phys. Soc. (London), 97 (1947)
Kikuchi, Aoki, and Wakatuki, Proc. Phys. Math. Soc. Japan 21, 410 (1939) T. Wakatuki and S. Kikuchi, 21, 656 (1939)
G. Placzek and H. A. Bethe, Phys. Rev. 57, 1075 (1940) Feld, Feshbach, Goldberger, Goldstein, and Weisskopf, Atomic Energy Commission Document NYO-636 (unpublished)
S. T. Butler, Proc. Roy. Soc. (London) A208, 559 (1951)
Poss, Salant, Snow, and Yuan, Phys. Rev. 87, 11 (1952)
L. S. Goodman, Argonne National Laboratory Report, ANL-4602 (1951) (unpublished) D. I. Meyer and W. Nyer, Los Alamos Report LA-1279 (1951) (unpublished)

[c1] A. B. Lillie and J. P. Conner, Rev. Sci. Instr. 22, 210 (1951)

[c2] H. A. Bethe, Revs. Modern Phys. 22, 213 (1950)

[c3] Hornyak, Lauritsen, Morrison, and Fowler, Revs. Modern Phys. 22, 291 (1950)

[c4] A. B. Lillie, Phys. Rev. 87, 716 (1952)

[c5] C. M. Crenshaw, Phys. Rev. 62, 54 (1942)

[c6] Amaldi, Bocciarelli, Cacciapuoti, and Trabacchi, Nuovo cimento 3, 15 and 203 (1946) International Conference on Fundamental Particles, Phys. Soc. (London), 97 (1947)

[c7] Kikuchi, Aoki, and Wakatuki, Proc. Phys. Math. Soc. Japan 21, 410 (1939) T. Wakatuki and S. Kikuchi, 21, 656 (1939)

[c8] G. Placzek and H. A. Bethe, Phys. Rev. 57, 1075 (1940) Feld, Feshbach, Goldberger, Goldstein, and Weisskopf, Atomic Energy Commission Document NYO-636 (unpublished)

[c9] S. T. Butler, Proc. Roy. Soc. (London) A208, 559 (1951)

[c10] Poss, Salant, Snow, and Yuan, Phys. Rev. 87, 11 (1952)

[c11] L. S. Goodman, Argonne National Laboratory Report, ANL-4602 (1951) (unpublished) D. I. Meyer and W. Nyer, Los Alamos Report LA-1279 (1951) (unpublished)

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A Cloud-Chamber Study of the Scattering of Fast Neutrons in Oxygen

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