Slow Neutron Velocity Spectrometer Studies of O2, N2, A, H2, H2O, and Seven Hydrocarbons

Edward Melkonian
Phys. Rev. 76, 1750 – Published 15 December 1949
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Abstract

The slow neutron cross sections of free atoms of O, N, and A have been determined to be; O:3.73, N:9.96, A:0.68 barn. Between 1 and 15 ev the N2 curve shows an E12 slope of 0.34 barn×(ev)½ per atom. Measurements on these elements have been extended to over 10,000 ev with no resonances observed. Dependence of cross section upon neutron energy from 1 ev to 0.003 ev is presented for O2, N2, H2, H2O, methane, ethane, propane, n-butane, cetane, ethylene, 1,3-butadiene, and liquidn-butane. At the lowest energies, the large observed H2 cross section is attributed largely to thermal translational motion of the molecule. The measurements on the hydrocarbons show the effect of the binding of H in various molecules. Comparison with the theories of Bethe and Arley is made. No difference has been detected in cross-section measurements on gaseous and liquid n-butane.

  • Received 19 August 1949

DOI:https://doi.org/10.1103/PhysRev.76.1750

©1949 American Physical Society

Authors & Affiliations

Edward Melkonian

  • Columbia University, New York, New York

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Issue

Vol. 76, Iss. 12 — December 1949

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