Neutron Angular Distributions and Spectra Produced by the Bombardment of Thick Targets by Deuterons PDF Download
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Author: C. E. Falk
Publisher:
ISBN:
Category : Deuterons
Languages : en
Pages : 288
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Author: C. E. Falk
Publisher:
ISBN:
Category : Deuterons
Languages : en
Pages : 288
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Book Description
Author: Jerry B. Marion
Publisher:
ISBN:
Category : Neutron beams
Languages : en
Pages : 96
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Book Description
The report is concerned with an analysis of the problems involved in the design and slection of equipment for the production of intense beams of 14-MeV neutrons. Since the aim is to achieve total neutron yields in excess of 10 to the 13th power/sec, a figure which considerably surpasses that commonly encountered with currently operating accelerators, it is necessary to extrapolate present performance to a considerable degree. Low-voltage accelerators in operation at the present time rarely produce DC beam currents in excess of 1 mA; currents of 600 micro amps. are considered 'high'. The production of neutron yields of 10 to the 13th power/sec will require beam currents greater than 10 mA. This is a significant increase and gives rise to problems of ion source design, source cooling, beam optics, target preparation, mechanical target des/gn, etc. These problems are analyzed individually and certain conclusions are reached and recommendations are made. (Author).
Author: C. Serpan
Publisher:
ISBN: 9780803105294
Category : Electronic book
Languages : en
Pages : 220
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Book Description
Studies of the effects resulting from exposure of materials to neutron bombardment in nuclear reactors can be made much more quantitative if the energy-level distribution of the neutrons is known. Such a distribution is commonly called a neutron spectrum. The neutron energies range from as low as 1 1010 MeV in the thermal-neutron region, to over 18 MeV in the fast region. This extremely wide range can be conveniently handled, however, using a system of 25 or even fewer groups each defining a precise energy range, with the neutron population within those energy bounds being tabulated as the neutron spectrum.
Author: William J. Knox
Publisher:
ISBN:
Category : Bismuth
Languages : en
Pages : 30
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Book Description
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: Ewart Merlin Baldwin
Publisher:
ISBN:
Category : Scattering (Physics)
Languages : en
Pages : 114
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Author: Mary Jean Scott
Publisher:
ISBN:
Category : Fast neutrons
Languages : en
Pages : 38
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Author: J. A. Grundl
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 182
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Book Description
Author: Nikolay Kornilov
Publisher: Springer
ISBN: 3319071335
Category : Science
Languages : en
Pages : 135
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Book Description
Although the fission of heavy nuclei was discovered over 75 years ago, many problems and questions still remain to be addressed and answered. The reader will be presented with an old, but persistent problem of this field: The contradiction between Prompt Fission Neutron (PFN) spectra measured with differential (microscopic) experiments and integral (macroscopic and benchmark) experiments (the Micro-Macro problem). The difference in average energy is rather small ~3% but it is stable and we cannot explain the difference due to experimental uncertainties. Can we measure the PFN spectrum with high accuracy? How may we compare results of different experiments to provide better accuracy? Are our traditional theoretical models correct? What can be done to solve the Micro-Macro problem in future? These questions are discussed in this monograph for the reader. The current work will be of interest to graduate students and researchers, particularly those working in nuclear and neutron physics.
Author: A. C. Helmholz
Publisher:
ISBN:
Category : Angular distribution (Nuclear physics).
Languages : en
Pages : 10
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Author: National Committee on Radiation Protection and Measurements (U.S.)
Publisher:
ISBN:
Category : Neutron flux
Languages : en
Pages : 104
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