Yield of Neutrons per Interaction in U, Pb, W, and Sn by Protons of Six Energies between 250 and 900 Mev Selected from Cosmic Radiation

Details Yield of Neutrons per Interaction in U, Pb, W, and Sn by Protons of Six Energies between 250 and 900 Mev Selected from Cosmic Radiation Yield of Neutrons per Interaction in U, Pb, W, and Sn by Protons of Six Energies between 250 and 900 Mev Selected from Cosmic Radiation

Jul 1960

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960phrv..119..412b&link_type=abstract

Physical Review, vol. 119, Issue 1, pp. 412-431

Physics

5

Scientific paper

The production of low-energy neutrons in U, Pb, W, and Sn by protons of six selected energies between 250 and 900 Mev has been measured using cosmic radiation as a proton source. The protons were selected and their energy measured by a vertical counter telescope containing three Cerenkov detectors which employed liquid nitrogen, water, and Plexiglas as radiating media. The protons interacted in 22 and 44 g cm-2 thick slabs of the target elements, and the neutrons produced were detected in a 4-foot cubic paraffin moderator, B10F3 counter assembly placed below the proton selecting telescope. The principal body of data was obtained at 3260 m altitude; a series of runs at 150 m was made to check the high-altitude data for muon contamination of the selected protons. The proton-gated neutron rates for the various targets were converted to mean neutron multiplicities per interaction using (a) the efficiency of the neutron detector as measured using calibrated Pu240 spontaneous fission and Ra-α-Be neutron sources (b) the interaction cross sections of Chen, Leavitt, and Shapiro. The mean multiplicities per interaction range from 5.8+/-1.0 for 300-Mev protons on 33 g cm-2 thick Sn, to 26.7+/-4.2 for 820-Mev protons on 44 g cm-2 thick U. The multiplicities predicted from the Monte Carlo nucleon cascade calculation of Metropolis et al. and the Monte Carlo evaporation calculation of Dostrovsky etal are in agreement with the measurements when secondary neutron production in the thick targets is taken into account.

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