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Title: Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments

Abstract

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 {sup 176}Hf and {sup 178}Hf 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. {sup 6}Li 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 {sup 176}Hf and {sup 178}Hf contributions to the 8 eV doublet without saturation. Data analyses were performed using the R-matrix Bayesian codemore » 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 {sup 176}Hf 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.« less

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Knolls Atomic Power Laboratory (KAPL), Niskayuna, NY
Sponsoring Org.:
USDOE
OSTI Identifier:
903190
Report Number(s):
LM-07K004
TRN: US0703584
DOE Contract Number:
DE-AC12-00SN39357
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ACCURACY; CAPTURE; CROSS SECTIONS; DATA ANALYSIS; GLASS; HAFNIUM; HAFNIUM ISOTOPES; LINEAR ACCELERATORS; MULTIPLICITY; NEUTRONS; REACTOR PHYSICS; RESONANCE; RESONANCE INTEGRALS; SATURATION; ZIRCONIUM

Citation Formats

Trbovich, M J, Barry, D P, Slovacek, R E, Danon, Y, Block, R C, Francis, N C, Lubert, M, Burke, J A, Drindak, N J, Lienweber, G, and Ballad, R. Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments. United States: N. p., 2007. Web. doi:10.2172/903190.
Trbovich, M J, Barry, D P, Slovacek, R E, Danon, Y, Block, R C, Francis, N C, Lubert, M, Burke, J A, Drindak, N J, Lienweber, G, & Ballad, R. Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments. United States. doi:10.2172/903190.
Trbovich, M J, Barry, D P, Slovacek, R E, Danon, Y, Block, R C, Francis, N C, Lubert, M, Burke, J A, Drindak, N J, Lienweber, G, and Ballad, R. Tue . "Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments". United States. doi:10.2172/903190. https://www.osti.gov/servlets/purl/903190.
@article{osti_903190,
title = {Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments},
author = {Trbovich, M J and Barry, D P and Slovacek, R E and Danon, Y and Block, R C and Francis, N C and Lubert, M and Burke, J A and Drindak, N J and Lienweber, G and Ballad, R},
abstractNote = {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 {sup 176}Hf and {sup 178}Hf 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. {sup 6}Li 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 {sup 176}Hf and {sup 178}Hf 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 {sup 176}Hf 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.},
doi = {10.2172/903190},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Feb 06 00:00:00 EST 2007},
month = {Tue Feb 06 00:00:00 EST 2007}
}

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