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Hafnium Resonance Parameter Analysis Using Neutron Capture And Transmission Experiments
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Book Synopsis Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments by :
Download or read book Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this work is to determine the resonance parameters for stable hafnium isotopes in the 0.005 - 200 eV region, with special emphasis on the overlapping 176Hf and 178Hf resonances near 8 eV. Accurate hafnium cross sections and resonance parameters are needed in order to quantify the effects of hafnium found in zirconium, a metal commonly used in reactors. The accuracy of the cross sections and the corresponding resonance parameters used in current nuclear analysis tools are rapidly becoming the limiting factor in reducing the overall uncertainty on reactor physics calculations. Experiments measuring neutron capture and transmission are routinely performed at the Rensselaer Polytechnic Institute (RPI) LINAC using the time-of flight technique. 6Li glass scintillation detectors were used for transmission experiments at flight path lengths of 15 and 25 m, respectively. Capture experiments were performed using a sixteen section NaI multiplicity detector at a flight path length of 25 m. These experiments utilized several thicknesses of metallic and isotope-enriched liquid Hf samples. The liquid Hf samples were designed to provide information on the 176Hf and 178Hf contributions to the 8 eV doublet without saturation. Data analyses were performed using the R-matrix Bayesian code SAMMY. A combined capture and transmission data analysis yielded resonance parameters for all hafnium isotopes from 0.005 - 200 eV. Additionally, resonance integrals were calculated, along with errors for each hafnium isotope, using the NJOY and INTER codes. The isotopic resonance integrals calculated were significantly different than previous values. The 176Hf resonance integral, based on this work, is approximately 73% higher than the ENDF/B-VI value. This is due primarily to the changes to resonance parameters in the 8 eV resonance, the neutron width presented in this work is more than twice that of the previous value. The calculated elemental hafnium resonance integral however, changed very little.
Book Synopsis Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments by : Y. Danon
Download or read book Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments written by Y. Danon and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this work is to determine resonance parameters for stable hafnium isotopes in the 0.005-200 eV region, with special emphasis on the overlapping {sup 176}Hf and {sup 178}Hf resonances near 8 eV. The large neutron cross section of hafnium, combined with its corrosion resistance and excellent mechanical properties, make it a useful material for controlling nuclear reactions. Experiments measuring neutron capture and transmission were performed at the Rensselaer Polytechnic Institute (RPI) electron linear accelerator (LINAC) using the time of flight method. {sup 6}Li glass scintillation detectors were used for transmission experiments at flight path lengths of 15 and 25 m. Capture experiments were done using a sixteen section NaI(Tl) multiplicity detector at a flight path length of 25 m. These experiments utilized various thicknesses of metallic and isotopically-enriched liquid samples. The liquid samples were designed to provide information on the {sup 176}Hf and {sup 178}Hf contributions to the 8 eV doublet without saturation. Data analysis was done using the R-matrix Bayesian code SAMMY version M6 beta. SAMMY is able to account for experimental resolution effects for each of the experimental setups at the RPI LINAC, and also can correct for multiple scattering effects in neutron capture yield data. The combined capture and transmission data analysis yielded resonance parameters for all hafnium isotopes from 0.005-200 eV. Resonance integrals were calculated along with errors for each hafnium isotope using the NJOY [1] and INTER [2] codes. The isotopic resonance integrals calculated were significantly different than previously published values; however the calculated elemental hafnium resonance integral changed very little.
Book Synopsis Neutron Capture and Transmission Measurements and Resonance Parameter Analysis of Niobium by :
Download or read book Neutron Capture and Transmission Measurements and Resonance Parameter Analysis of Niobium written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement and Analysis of the Resolved Resonance Cross Sections of the Natural Hafnium Isotopes by :
Download or read book Measurement and Analysis of the Resolved Resonance Cross Sections of the Natural Hafnium Isotopes written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Hafnium is a ductile metallic element with a large neutron absorption cross section. It can be used in reactor control rods to regulate the fission process. The NEA High Priority Request List for nuclear data presents a need for improved characterisation of the hafnium cross section in the resolved resonance region. This thesis presents new resonance cross section parameters for the six natural hafnium isotopes. Cross section measurements, supported by the NUDAME and EUFRAT projects, were performed at the IRMM Geel GELINA time-of-flight facility. Capture experiments were conducted on the 12 m, 28 m and 58 m flight paths using C\(_6\)D\(_6\) detectors and transmission experiments were performed at flight paths of 26 m and 49 m using a \(^6\)Li glass detector. The samples used were metallic natural hafnium discs of various thicknesses and hafnium oxide powders, with differing isotopic enrichments. Data analysis was performed using the least square fitting REFIT code, which was updated during this work. The use of isotopically-enriched samples enabled previously unrecorded resonances to be allocated to the correct isotope. The resulting evaluated data files extend the upper energy limits of the resolved resonance regions for the \(^{174}\)Hf, \(^{176}\)Hf, \(^{177}\)Hf, \(^{178}\)Hf, \(^{179}\)Hf and \(^{180}\)Hf isotopes, relative to the current European recommended evaluation (JEFF3.1), to 250 eV, 3 keV, 1 keV, 3 keV, 1 keV and 3 keV respectively. The natural hafnium resonance integral calculated from the new resonance parameters is 1.2% lower than the integral corresponding to the JEFF3.1 evaluated hafnium data. Comparison of calculated to experimental k-effective values for appropriate zero-power reactor assemblies show improvement over the JEFF3.1 data.
Book Synopsis Neutron Resonance Parameters by : Sergey I Sukhoruchkin
Download or read book Neutron Resonance Parameters written by Sergey I Sukhoruchkin and published by Springer. This book was released on 2015-01-28 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume I/26A is presenting newly published neutron resonance parameters for nuclei ranging from Hydrogen (Z=1) to Californium (Z=98) supplementing data published in previous Landolt-Börnstein volumes. The quality and precision of the data have been improved considerably. The data were compiled by two eminent experts in the field who undertook great efforts to compare data from different laboratories to present "best values". Accurate neutron resonance parameters embody an important contribution to improve nuclear data for a variety of applications such as the design and safe operation of nuclear reactors, the development of advanced energy production technologies, transmutation of nuclear waste, and nuclear astrophysics. Additionally, one chapter is dedicated to the characterization of materials and objects by neutron resonance spectroscopy. Transmission and capture analysis using time-of-flight measurements are described in detail. Applications ranging from archeology, astrophysics, investigation of nuclear material, thermometry or resonance imaging for the study of molten nuclear fuel are presented. Another chapter presents empirical evidence for regularities in the systematics of level spacing. In view of the large amount of data the parameters for only the most important resonances are given in the printed version, whereas the data for all resonances are available online on www.springermaterials.com. Neutron resonance parameters of many nuclei were previously published by Landolt-Börnstein in Volumes I/16B, I/16C, and I/24.
Book Synopsis Neutron Resonance Parameters of 238U and the Calculated Cross Sections from the Reich-Moore Analysis of Experimental Data in the Neutron Energy Range from 0 KeV to 20 KeV. by : H. Derrien
Download or read book Neutron Resonance Parameters of 238U and the Calculated Cross Sections from the Reich-Moore Analysis of Experimental Data in the Neutron Energy Range from 0 KeV to 20 KeV. written by H. Derrien and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The neutron resonance parameters of {sup 238}U were obtained from a SAMMY analysis of high-resolution neutron transmission measurements and high-resolution capture cross section measurements performed at the Oak Ridge Electron Linear Accelerator (ORELA) in the years 1970-1990, and from more recent transmission and capture cross section measurements performed at the Geel Linear Accelerator (GELINA). Compared with previous evaluations, the energy range for this resonance analysis was extended from 10 to 20 keV, taking advantage of the high resolution of the most recent ORELA transmission measurements. The experimental database and the method of analysis are described in this report. The neutron transmissions and the capture cross sections calculated with the resonance parameters are compared with the experimental data. A description is given of the statistical properties of the resonance parameters and of the recommended values of the average parameters. The new evaluation results in a slight decrease of the effective capture resonance integral and improves the prediction of integral thermal benchmarks by 70 pcm to 200 pcm.
Book Synopsis Neutron Transmissions, Capture Yields, and Resonance Parameters in the Energy Range of 0.01 EV to 1 KeV in Rhenium by : Brian Edward Epping
Download or read book Neutron Transmissions, Capture Yields, and Resonance Parameters in the Energy Range of 0.01 EV to 1 KeV in Rhenium written by Brian Edward Epping and published by . This book was released on 2013 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this thesis is to improve upon the existing neutron cross section data for rhenium (Re) in the energy range 0.01 eV to 1 keV. Neutron transmission and capture yield measurements were performed using natural rhenium samples at the Rensselaer Polytechnic Institute Gaerttner Linear Accelerator Center. Measurements were performed using the time of flight method, in which neutron energies are differentiated using the elapsed times between neutron emission from a pulsed neutron source and the subsequent detector interactions. Transmission measurements were performed using 6Li glass scintillation detectors. Capture measurements were performed utilizing a 16-segment NaI(Tl) multiplicity detector. Most measurements were performed at a flight path length of 25 meters, with one set of experiments (thermal transmission) performed at 15 meters. The experiments used several metallic, elemental rhenium samples of various thicknesses, ranging from 1 mil to 100 mils. (1 mil = 0.001 inch = 0.0254 mm) Following the reduction of the experimental data, SAMMY was used to perform the data analysis. SAMMY is a shape-fitting Bayesian analysis code that determines resonance parameters by fitting neutron time of flight data using the Reich-Moore approximation of R-matrix theory. The combined transmission and capture yield data analysis determined resonance parameters for rhenium resonances in the energy range of 0.01 eV to 1 keV. The updated rhenium resonance parameters are compared to previously published parameters and ENDF/B-VII.1.
Book Synopsis Handbook of Nuclear Engineering by : Dan Gabriel Cacuci
Download or read book Handbook of Nuclear Engineering written by Dan Gabriel Cacuci and published by Springer Science & Business Media. This book was released on 2010-09-14 with total page 3701 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an authoritative compilation of information regarding methods and data used in all phases of nuclear engineering. Addressing nuclear engineers and scientists at all levels, this book provides a condensed reference on nuclear engineering since 1958.
Book Synopsis Reports to the AEC Nuclear Cross Sections Advisory Group by :
Download or read book Reports to the AEC Nuclear Cross Sections Advisory Group written by and published by . This book was released on 1964-10 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental neutron resonance spectroscopy by : J Harvey
Download or read book Experimental neutron resonance spectroscopy written by J Harvey and published by Elsevier. This book was released on 2012-12-02 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental Neutron Resonance Spectroscopy deals with the experimental technique of neutron resonance spectroscopy. Pulsed accelerator time-of-flight spectrometers and gamma rays from neutron capture in resonances are discussed. Total neutron cross section measurements are presented, along with neutron scattering and capture cross-section measurements and measurements on fissile nuclides. This book is comprised of five chapters and begins with an introduction to pulsed accelerator time-of-flight spectrometers with moderated continued neutron spectra, together with the pulsed Van De Graaff. Experimental techniques used for neutron cross section measurements, including detectors and data acquisition equipment, are then outlined. Scattering measurements and capture measurements as well as gamma-ray spectra from the capture of neutrons in resonances are considered. The final chapter focuses on the detailed and varied experiments that have been performed on the complicated fission process, together with the parameters of the resonances of the fissile nuclides. This monograph will be a useful resource for spectroscopists and physicists.
Book Synopsis Reports to the AEC Nuclear Cross Sections Advisory Group by : A. B. Smith
Download or read book Reports to the AEC Nuclear Cross Sections Advisory Group written by A. B. Smith and published by . This book was released on 1965 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of the Neutron Capture Cross Section and Resonance Integral of Hafnium by : I. Itkin
Download or read book Analysis of the Neutron Capture Cross Section and Resonance Integral of Hafnium written by I. Itkin and published by . This book was released on 1962 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis AEC Research and Development Report by : Atomic Energy Commission
Download or read book AEC Research and Development Report written by Atomic Energy Commission and published by . This book was released on with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Conference on Nuclear Data for Science and Technology by : Robert C. Haight
Download or read book International Conference on Nuclear Data for Science and Technology written by Robert C. Haight and published by American Institute of Physics. This book was released on 2005-06-24 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: All papers were peer reviewed. This conference focused on the broad field of nuclear data, their production, dissemination, and testing, with the goal of providing reliable data for applications such a nuclear fission and fusion energy, accelerators, spallation neutron sources, nuclear medicine, environment, space, non-proliferation, nuclear safety, astrophysics and cosmology, and basic research.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976-03 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1977 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2004 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt:
