Neutron Yields from Thick Targets Bombarded by 18- and 32-Mev Protons
Author: George Patrick Millburn
Publisher:
Published: 1956
Total Pages: 112
ISBN-13:
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Author: George Patrick Millburn
Publisher:
Published: 1956
Total Pages: 112
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DOWNLOAD EBOOKAuthor: William J. Knox
Publisher:
Published: 1950
Total Pages: 30
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DOWNLOAD EBOOKRelative neutron yields in the forward direction from various target elements bombarded with 350 Mev protons and 190 Mev deuterons have been measured. Bismuth fission chambers with a threshold of about 50 Mev were used to detect the high energy neutrons. The actual flux of protons or deuterons traversing each target was determined from the activities induced in graphite monitors attached to the target. When a deuteron beam is used, the neutron yields for light elements agree with the values predicted by the deuteron stripping theory. For the heavy elements the observed values are fitted best by adding a function proportional to Z-sq to the stripping theory values. This may be interpreted as evidence for the production of high energy neutrons by the electric field disintegration of the deuteron. The neutron yields from the proton beam vary approximately as (A - Z)(exp(2/3)) for target elements from C to U. This indicates that the heavy elements are not completely transparent to 350 Mev protons. Beryllium has an anomalous neutron yield 50% higher than that for C. Calculations and measurements on the problem of multiple traversals of beam particles through thin targets are presented.
Author: Thomas Marshall Amos (Jr.)
Publisher:
Published: 1972
Total Pages: 322
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DOWNLOAD EBOOKAuthor: Hoyt Alan Bostick
Publisher:
Published: 1959
Total Pages: 106
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Published: 1979
Total Pages:
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DOWNLOAD EBOOKStopping samples of Lucite, Al, Fe, and 238U (Fe, and 238U) were irradiated with 330 MeV deuterons (260 MeV protons). For each target, neutron energy spectra and prompt .gamma.-ray yields were measured using the time-of-flight technique. The detector was a right cylindrical volume of deuterated benzene, 12.5-cm diameter x 7.5-cm long, located at 110° to the incident beam direction. The neutron yield and the prompt .gamma.-ray yield were found to depend upon the atomic number of the target and upon the incident projectile. The measured shape of the neutron energy spectrum was not strongly dependent on either the incident projectile or the target atomic number. A lower limit for absolute neutron yields was also obtained.
Author: A. M. Lenchek
Publisher:
Published: 1963
Total Pages: 40
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DOWNLOAD EBOOKAuthor: Edward Gross
Publisher:
Published: 1956
Total Pages: 172
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DOWNLOAD EBOOKAuthor: Richard D. Miller
Publisher:
Published: 1950
Total Pages: 12
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Publisher:
Published: 1976-05
Total Pages: 912
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