Measurement of Transport and Inelastic Scattering Cross Sections for Fast Neutrons. II. Experimental Results

Barschall, H. H.; Battat, M.E.; Bright, William C.; Graves, E. R.; Jorgensen, Theodore P.; Manley, John H.

doi:10.1103/physrev.72.881

Cited by 27 publications

(1 citation statement)

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“…Perhaps fortuitously the absolute value of cross section is in good agreement with that obtained by the Los Alamos group of 1.4 barns at a neutron energy of 1.5 Mev. 13 The value given by Walt and Barschall 14 of 2.2 barns at a neutron energy of 1 Mev is considerably higher. Their value is for the excitation of all levels above 250 kev, and below 1 Mev.…”

Section: Tantalum: Z=73mentioning

confidence: 85%

Excitation of Some Low-Lying Levels by Inelastic Neutron Scattering

Guernsey

Wattenberg

1956

Phys. Rev.

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The de-excitation gamma radiation following inelastic scattering of neutrons has been studied for eight elements (of normal isotopic abundance) with excited states between 100 and 350 kev. A thin Nal(Tl) crystal spectrometer is used as a gamma-ray detector. Yield curves for the gamma rays from low-lying levels in manganese, iodine, hafnium, tantalum, wolfram, rhenium, platinum, and gold have been obtained as a function of neutron energy for neutrons from 100 to 1800 kev. In some cases these yield curves represent a composite of gamma radiation from the directly excited states under observation, and cascade radiation from higher excited states. A comparison of the yield with total inelastic scattering cross sections requires a complete knowledge of the decay schemes. This is discussed for the individual elements. In the cases of Mn, I, and Re cross-section values obtained represent that part of the total inelastic cross section which arises from the excitation of a single known level.Agreement of the excitation curves with Hauser-Feshbach theory is good in most cases. No large unanticipated effects seems to arise in the inelastic scattering of neutrons from levels known to be rotational. * Supported in part by the joint program of the Office of Naval Research and the U. S. Atomic Energy Commission. f Also at Wellesley College. iR. M. Kiehn and C. Goodman, Phys. Rev. 95, 987 (1954); R. B. Day, Phys. Rev. 89, 908(A) (1953). 2 A.

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Section: Tantalum: Z=73mentioning

confidence: 85%