Fast Neutron Cross Section Measurements . Progress Report

Fast Neutron Cross Section Measurements . Progress Report PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 41

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From its inception, the Nuclear Data Project at the University of Michigan has concentrated on two major objectives: (1) to carry out carefully controlled nuclear measurements of the highest possible reliability in support of the national nuclear data program, and (2) to provide an educational opportunity for students with interests in experimental nuclear science. The project has undergone a successful transition from a primary dependence on our photoneutron laboratory to one in which our current research is entirely based on a unique pulsed 14 MeV fast neutron facility. The new experimental facility is unique in its ability to provide nanosecond bursts of 14 MeV neutrons under conditions that are ''clean'' and as scatter-free as possible, and is the only one of its type currently in operation in the United States. It has been designed and put into operation primarily by graduate students, and has met or exceeded all of its important initial performance goals. We have reached the point of its routine operation, and most of the data are now in hand that will serve as the basis for the first two doctoral dissertations to be written by participating graduate students. Our initial results on double differential neutron cross sections will be presented at the May 1993 Fusion Reactor Technology Workshop. We are pleased to report that, after investing several years in equipment assembly and optimization, the project has now entered its ''data production'' phase.

Fast Neutron Cross Section Measurements . Progress Report

Fast Neutron Cross Section Measurements . Progress Report PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 41

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Book Description
From its inception, the Nuclear Data Project at the University of Michigan has concentrated on two major objectives: (1) to carry out carefully controlled nuclear measurements of the highest possible reliability in support of the national nuclear data program, and (2) to provide an educational opportunity for students with interests in experimental nuclear science. The project has undergone a successful transition from a primary dependence on our photoneutron laboratory to one in which our current research is entirely based on a unique pulsed 14 MeV fast neutron facility. The new experimental facility is unique in its ability to provide nanosecond bursts of 14 MeV neutrons under conditions that are ''clean'' and as scatter-free as possible, and is the only one of its type currently in operation in the United States. It has been designed and put into operation primarily by graduate students, and has met or exceeded all of its important initial performance goals. We have reached the point of its routine operation, and most of the data are now in hand that will serve as the basis for the first two doctoral dissertations to be written by participating graduate students. Our initial results on double differential neutron cross sections will be presented at the May 1993 Fusion Reactor Technology Workshop. We are pleased to report that, after investing several years in equipment assembly and optimization, the project has now entered its ''data production'' phase.

Absolute Measurement of Neutron Cross Sections. Progress Report

Absolute Measurement of Neutron Cross Sections. Progress Report PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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The procedures and status of the absolute measurement of the neutron capture cross sections for 115In and 232Th are described. Work on the 239Pu fission fragment anisotropy and absolute measurement of the fast neutron fission cross section for 233U are briefly described. Progress in establishing the 14 MeV neutron measurements at the facility are discussed. (WHK).

(Fast Neutron Cross Section Measurements).

(Fast Neutron Cross Section Measurements). PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 27

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Book Description
In this report, we outline the progress achieved in two distinct under the DOE-sponsored cross section project: the initial results obtained from the pulsed 14 MeV neutron facility, and a cooperative effort with Argonne National Laboratory in the measurement of fast neutron cross sections in yttrium. In the 14 MeV neutron laboratory, this year has seen the maturation of the project into one in which initial scattering measurements are now underway. We have improved the accelerator and ion source in several significant ways, so that neutron intensities have now been proven to be adequate for our series of elastic scattering angular distribution measurements outlined in our initial proposal of two years ago. We have successfully tested all components of the time-of-flight spectrometer and recorded initial neutron spectra from the ring targets that we have obtained for our first angular distribution measurements. Examples of the time-of-flight spectra that have been obtained are given later in this report. At the present time, the accelerator is operating with the highest degree of reliability that we have experienced since installing the pulsing system. Improvements made over the past year have not only increased the available neutron intensity, but also increased our capability to deal with inevitable component failures that require repair or replacement. The measurements carried out in conjunction with Argonne have contributed significantly to the available database on fast neutron interactions in yttrium. Results indicate that the cross section for the 89 Y(n, p)89Sr reaction is substantially higher than represented in ENDF/B-VI.

Conference on Neutron Cross Section Technology

Conference on Neutron Cross Section Technology PDF Author: P. B. Hemmig
Publisher:
ISBN:
Category : Neutron cross sections
Languages : en
Pages : 572

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Neutron Cross Sections and Technology

Neutron Cross Sections and Technology PDF Author: David T. Goldman
Publisher:
ISBN:
Category : Neutron cross sections
Languages : en
Pages : 680

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Fast Neutron Cross Section Measurements. Final Technical Report, March 1, 1987--September 30, 1995

Fast Neutron Cross Section Measurements. Final Technical Report, March 1, 1987--September 30, 1995 PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 90

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The time-of-flight technique was used with the ring scattering geometry in a laboratory with low neutron scattering background to measure the angular distributions of the cross sections for elastic and inelastic scattering of 14 MeV neutrons in natural chromium, iron, nickel, and niobium. Specifically for inelastic scattering included were: the 1.43 MeV and 4.56 MeV levels of 52Cr, the 0.85 MeV level, and (2.94-3.12) MeV and (4.46-4.51) MeV level groups of 56Fe, the 1.33 MeV level of 6°Ni combined with the 1.45 MeV level of 58Ni, and the 4.48 MeV level of 58Ni. Pulses of neutrons with time width of 0.9-1.1 ns were produced via the 3H(d, n)4He reaction in a 150 keV Cockcroft-Walton linear accelerator, with average intensities of 9x108 n/s. The energy of the incident neutrons was between 14.75 MeV (at 16°) and 13.48 MeV (at 160°). High purity scattering ring samples were used. The scattering angles ranged from (almost equal to)16° to (almost equal to)150°, for iron, chromium, and nickel, and from (almost equal to)16° to (almost equal to)160° for niobium, with a typical step of (almost equal to)10°. High purity ring samples were used.

Nuclear Science Abstracts

Nuclear Science Abstracts PDF Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1146

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Precision Neutron Cross Section Measurements in Support of the LMFBR Program. Progress Report for July 1, 1974--September 30, 1974

Precision Neutron Cross Section Measurements in Support of the LMFBR Program. Progress Report for July 1, 1974--September 30, 1974 PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Energy Research Abstracts

Energy Research Abstracts PDF Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 654

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Final Report of the Fast Neutron Data Project

Final Report of the Fast Neutron Data Project PDF Author: Bernard Taub Feld
Publisher:
ISBN:
Category : Fast neutrons
Languages : en
Pages : 244

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