Comparison of Measured Neutron and Proton Spectra with Calculated Spectra in the Energy PDF Download
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Languages : en
Pages : 10
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Author:
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Category :
Languages : en
Pages : 10
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Author:
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Category :
Languages : en
Pages :
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Neutron and gamma-ray energy spectra resulting from the streaming of 14 MeV neutrons through a 0.30-m-diameter duct (length-to-diameter ratio = 2.83) have been calculated using the Monte Carlo code MCNP. The calculated spectra are compared with measured data and data calculated previously using a combination of discrete ordinates and Monte Carlo methods. Comparisons are made at twelve detector locations on and off the duct axis for neutrons with energies above 850 keV and for gamma rays with energies above 750 keV. The neutron spectra calculated using MCNP agree with the measured data within approx. 5 to approx. 50%, depending on detector location and neutron energy. Agreement with the measured gamma-ray spectra is also within approx. 5 to approx. 50%. The spectra obtained with MCNP are also in favorable agreement with the previously calculated data and were obtained with less calculational effort.
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Category : Aeronautics
Languages : en
Pages : 696
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Category :
Languages : en
Pages : 15
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Author: H. Gruppelaar
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Category :
Languages : en
Pages : 121
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Author: Cheol Ho Pyeon
Publisher: Springer
ISBN: 9789811603433
Category : Science
Languages : en
Pages : 352
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This open access book is a unique compilation of experimental benchmark analyses of the accelerator-driven system (ADS) at the Kyoto University Critical Assembly (KUCA) on the most recent advances in the development of computational methods. It is devoted especially to nuclear engineers and scientists. Readers will find a detailed description of advanced measurement techniques and calculation methodologies for the ADS with 14 MeV neutrons and high-energy neutrons (with combined use of 100 MeV protons and Pb-Bi target) at KUCA. Additionally, experimental results of nuclear transmutation of minor actinides by ADS and at a critical state are included. Readers also have access to benchmarks of specific ADS experiments with raw data in the Appendix. The book is a valuable resource for the ADS experiments at KUCA which are globally recognized as both static and kinetic studies from the point of view of fundamental research.
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Languages : en
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A research program in energetic-neutron spectrometry was carried out under Contracts AT(30-1)-3914 and AT(11-1)-5255 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. 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 1/2 ameter by 8 inch thick second detector. For a flight path of 4 meters, the energy resolution of the spectrometer varies from about 2 x 10/sup -5/ at 10 MeV to 8 x 10/sup -7/ at 500 MeV. Background from neutroncarbon interactions is determined from separate spectral measurements with first detectors differing significantly in their relative hydrogen- carbon composition. Measurements with 14 MeV neutrons confirm the resolution and efficiency of the epectrometer 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 cascade-evaporation spectrum. While the shapes of the measured and calculated spectra are in general agreement, this comparison shows that the intranuclear cascade model underestimates the production of cascade neutrons at wide angles; furthermore, this comparison shows that this discrepancy increases with increasing angle of emission. (auth).
Author: K.H. Bockhoff
Publisher: Springer Science & Business Media
ISBN: 9400970994
Category : Science
Languages : en
Pages : 1049
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Proceedings of the International Conference, Antwerp, Belgium, September 6-10, 1982
Author: John E. Evans
Publisher:
ISBN:
Category : Fast neutrons
Languages : en
Pages : 56
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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.
