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

Abstract

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.more » 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.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lockheed Martin Corporation, Schenectady, NY 12301 (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
837663
Report Number(s):
LM-04K119
TRN: US0501054
DOE Contract Number:  
AC 12-00-SN39357
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 13 Oct 2004
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 42 ENGINEERING; CAPTURE; CORROSION RESISTANCE; CROSS SECTIONS; DATA ANALYSIS; HAFNIUM; HAFNIUM ISOTOPES; LINEAR ACCELERATORS; MECHANICAL PROPERTIES; MULTIPLE SCATTERING; NEUTRON REACTIONS; NEUTRONS; NUCLEAR REACTIONS; R MATRIX; RESONANCE; RESONANCE INTEGRALS; SCINTILLATION COUNTERS; TIME-OF-FLIGHT METHOD

Citation Formats

MJ Trbovich, DP Barry, RE Slovacck, Y Danon, RC Block, JA Burke, NJ Drindak, G Leinweber, and RV Ballad. Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments. United States: N. p., 2004. Web. doi:10.2172/837663.
MJ Trbovich, DP Barry, RE Slovacck, Y Danon, RC Block, JA Burke, NJ Drindak, G Leinweber, & RV Ballad. Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments. United States. doi:10.2172/837663.
MJ Trbovich, DP Barry, RE Slovacck, Y Danon, RC Block, JA Burke, NJ Drindak, G Leinweber, and RV Ballad. Wed . "Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments". United States. doi:10.2172/837663. https://www.osti.gov/servlets/purl/837663.
@article{osti_837663,
title = {Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments},
author = {MJ Trbovich and DP Barry and RE Slovacck and Y Danon and RC Block and JA Burke and NJ Drindak and G Leinweber and RV Ballad},
abstractNote = {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.},
doi = {10.2172/837663},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Oct 13 00:00:00 EDT 2004},
month = {Wed Oct 13 00:00:00 EDT 2004}
}

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