Neutrons produced by 740-MeV protons on uranium

Veeser, L. R.; Fullwood, R.R.; Robba, A.A.; Shunk, E.R.

doi:10.1016/0029-554x(74)90299-7

Cited by 7 publications

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“…We were invited to participate in these measurements and, in particular, to measure the high-energy or cascade region of the spectrum. In a com-' panion experiment with different techniques, Veeser et al (1972Veeser et al ( , 1973 measured the evaporation neutron spectra from 60 keV to 10 MeV at both 50 and 130 degrees.…”

Section: -81 Performance At 14 Mevmentioning

confidence: 99%

“…The illuminated volume was computed from the geometry of the experimental arrangement. Veeser et al (1972Veeser et al ( , 1973 calculated the contributio n to the neutron beam from neutrons scattered in the collimator walls. The results of this Monte Carlo calculation indicate that for neutron energies between 0.1 and 14 MeV there is a contribution to the neutron beam of between 2.5 and 3 percent.…”

Section: +4mentioning

confidence: 99%

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Energetic neutron spectrometry. Final report, December 1, 1967--March 31, 1972

Madey¹,

Waterman²

1973

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A research program in energetic-neutron spectrometry was carried out under Contracts AT(30-1)-3914 and AT(11-1)-3258 with Clarkson College of Technology during the period from 1 December. 1967 through 31 March 1972. Accomplishments under this program include the development of a self-contained time-of-flight spectrometer for neutrons from 1 to 500 MeV and the measurement of neutron spectra from a thick target. Early developmental work was conducted with 14 MeV neutrons at the National Research Council, Ottawa, Canada. Later, measurements at higher energies were made at the 184-inch cyclotron of the Lawrence Berkeley Laboratory. These include the measurement of 220 MeV neutrons from stripping 4 447 MeV deuterons on beryllium and the measurement of neutron spectra from 740 MeV proton bombardment of a thick uranium target. Basically, the spectrometer measures the time-of-flight of a neutron scattered between two scintillation counters. The intrinsic time dispersion of the system is 2.2 nanoseconds (fwhm) with a 2* inch' diameter by 2* inch high first detector and a 9 inch diameter by 8 inch thick second detector. For a flight path of.4 meters, the energy resolution of the spectrometer varies from about 2 x loTs at 10 MeV to 8 x 10-7 at 500 MeV. Background from neutron-carbon interactions is determined from separate spectral measurements with first detectors differing iii iV significantly in their relative hydrogen-carbon composition. Measurements with 14 MeV neutrons confirm the resolution and efficiency of the spectrometer at low energies. Measurements at 220 MeV verify the resolution of the spectrometer at this energy and demonstrate the technique for subtracting:.the. carbon background. Neutron spectra from 740 MeV proton bombardment of a 30-cm thick uranium target were measured from 20 to 500 MeV at 50 degrees and from 5 to 140 MeV at 130 degrees with respect to the proton beam at LBL. The results are compared with a Monte Carlo calculation of the neutron cascadeevaporation &5 spectrum. While the shapes of the measured and calculated V spectra are in general agreement, this comparison shows that the intranuclear cascade model underestimates the production of cas cade neutrons at wide angles; furthermore, this comparison shows that this discrepancy increases with increasing angle of ernission. :

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Section: -81 Performance At 14 Mevmentioning

confidence: 99%

Section: +4mentioning

confidence: 99%