Neutron Yields From Proton Bombardment Of Thick Targets PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Neutron Yields From Proton Bombardment Of Thick Targets PDF full book. Access full book title Neutron Yields From Proton Bombardment Of Thick Targets.
Author | : Thomas Marshall Amos (Jr.) |
Publisher | : |
Total Pages | : 322 |
Release | : 1972 |
Genre | : Neutrons |
ISBN | : |
Download Neutron Yields from Proton Bombardment of Thick Targets Book in PDF, ePub and Kindle
Author | : George Patrick Millburn |
Publisher | : |
Total Pages | : 112 |
Release | : 1956 |
Genre | : Neutrons |
ISBN | : |
Download Neutron Yields from Thick Targets Bombarded by 18- and 32-Mev Protons Book in PDF, ePub and Kindle
Author | : William J. Knox |
Publisher | : |
Total Pages | : 30 |
Release | : 1950 |
Genre | : Bismuth |
ISBN | : |
Download Relative High Energy Neutron Yields from Targets Bombarded with Protons and Deuterons (UCRL-440) Book in PDF, ePub and Kindle
Relative 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 | : Lawrence Livermore Laboratory |
Publisher | : |
Total Pages | : 28 |
Release | : 1979 |
Genre | : Ion bombardment |
ISBN | : |
Download Thick-target Neutron and [gamma]-ray Yields Induced by Medium-energy Proton and Deuteron Bombardments Book in PDF, ePub and Kindle
Author | : G. C. Ball |
Publisher | : |
Total Pages | : 0 |
Release | : 1981 |
Genre | : |
ISBN | : |
Download Neutron yields from high energy heavy-ion bombardment of thick heavy targets Book in PDF, ePub and Kindle
Author | : Lawrence Livermore Laboratory |
Publisher | : |
Total Pages | : 28 |
Release | : 1979 |
Genre | : Ion bombardment |
ISBN | : |
Download Thick-target neutron and γ-ray yields induced by medium-energy proton and deuteron bombardments Book in PDF, ePub and Kindle
Author | : Burridge Jennings |
Publisher | : |
Total Pages | : 48 |
Release | : 1950 |
Genre | : Neutrons |
ISBN | : |
Download Neutron Production by Proton Bombardment Below the (p,n) Threshold Book in PDF, ePub and Kindle
Author | : C. E. Falk |
Publisher | : |
Total Pages | : 288 |
Release | : 1950 |
Genre | : Deuterons |
ISBN | : |
Download Neutron Angular Distributions and Spectra Produced by the Bombardment of Thick Targets by Deuterons Book in PDF, ePub and Kindle
Author | : Chalk River Nuclear Laboratories. Neutron and Solid State Physics Branch |
Publisher | : Chalk River, Ont. : Neutron and Solid State Physics Branch, Chalk River Laboratories |
Total Pages | : 9 |
Release | : 1992 |
Genre | : |
ISBN | : |
Download Thick Target Neutron Yields from Spallation Reactions Book in PDF, ePub and Kindle
Author | : Natalie Ann McGirl |
Publisher | : |
Total Pages | : 148 |
Release | : 2017 |
Genre | : Cosmic ray neutrons |
ISBN | : |
Download Double Differential Neutron Yields Produced by Proton, Helium, and Iron Interactions in Thick Aluminum Targets Book in PDF, ePub and Kindle
Recent calculations of galactic cosmic ray (GCR) transport in enclosed, shielded space environments indicate that a minimum dose equivalent is achieved with aluminum shielding thicknesses near 20 g/cm2 [grams per centimeter squared]. Increases in the absorbed dose and dose equivalent with shielding thicknesses above 20 g/cm2 are believed to be caused by the production of light ions and neutrons in the thick shielding. However, uncertainties surround these calculations due to limited cross section and yield data for high-energy projectiles incident on thick targets. Thick-target neutron yields are particularly valuable measurements since they are produced over a wide range of energies by primary and secondary particles and include neutrons modified by transport through a material. Thus, a database of thick-target neutron yield measurements will help validate transport code calculations and quantify uncertainties between experimental and simulated data. In March 2016, secondary neutron yields from GCR-like projectiles impinging upon thick targets were measured at Brookhaven National Laboratory's NASA Space Radiation Laboratory. 400 and 800 AMeV [megaelectron volt per nucleon] iron and proton, and 400 AMeV helium projectiles were set incident upon 20, 40, and 60 g/cm2-thick aluminum targets, and a second 60 g/cm2 aluminum target was centered downstream to study backscattered neutrons at a later date. Upstream target neutron yields were measured with liquid scintillators at 10° [degrees], 30°, 45°, 60°, 80°, and 135° off the beam axis using the time-of-flight technique. Measurements were converted to double differential thick-target yields and compared with PHITS and MCNP transport model calculations. Comparisons with PHITS and MCNP revealed inconsistencies at low to intermediate energies, in addition to overestimations of the experimental yields at the 10° high-energy peak. Wide-angle yields at the shoulder energies were fairly well modeled for most systems, and yields at 135° were underestimated for the 400 AMeV projectile beams. Overall, both codes would benefit from improvements in their neutron production models, particularly below the peak or shoulder energies. This systematic study on secondary neutrons produced by thick-target interactions will be incorporated by NASA into a rigorous uncertainty quantification procedure, which will ultimately help determine optimal shielding thicknesses for future space applications.