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Title: Thermal Neutron Capture Cross Sections of the PalladiumIsotopes

Abstract

Precise gamma-ray thermal neutron capture cross sectionshave been measured at the Budapest Reactor for all elements withZ=1-83,92 except for He and Pm. These measurements and additional datafrom the literature been compiled to generate the Evaluated Gamma-rayActivation File (EGAF), which is disseminated by LBNL and the IAEA. Thesedata are nearly complete for most isotopes with Z<20 so the totalradiative thermal neutron capture cross sections can be determineddirectly from the decay scheme. For light isotopes agreement with therecommended values is generally satisfactory although large discrepanciesexist for 11B, 12,13C, 15N, 28,30Si, 34S, 37Cl, and 40,41K. Neutroncapture decay data for heavier isotopes are typically incomplete due tothe contribution of unresolved continuum transitions so only partialradiative thermal neutron capture cross sections can be determined. Thecontribution of the continuum to theneutron capture decay scheme arisesfrom a large number of unresolved levels and transitions and can becalculated by assuming that the fluctuations in level densities andtransition probabilities are statistical. We have calculated thecontinuum contribution to neutron capture decay for the palladiumisotopes with the Monte Carlo code DICEBOX. These calculations werenormalized to the experimental cross sections deexciting low excitationlevels to determine the total radiative thermal neutron capture crosssection. The resulting palladium cross sections values were determinedwith a precisionmore » comparable to the recommended values even when only onegamma-ray cross section was measured. The calculated and experimentallevel feedings could also be compared to determine spin and parityassignments for low-lying levels.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USDOE Director. Office of Science. NuclearPhysics
OSTI Identifier:
925521
Report Number(s):
LBNL-60966
R&D Project: NISON; BnR: KB0301042; TRN: US0803051
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Conference: 12th International Conference on Gamma-raySpectroscopy, Notre Dame, Indiana, September 4-9,2005
Country of Publication:
United States
Language:
English
Subject:
73; 07; 38; ACCURACY; CAPTURE; CROSS SECTIONS; DECAY; EXCITATION; FLUCTUATIONS; IAEA; NEUTRON REACTIONS; PALLADIUM; PALLADIUM ISOTOPES; PARITY; SPECTROSCOPY; SPIN; THERMAL NEUTRONS; Palladium cross sections statistical model

Citation Formats

Firestone, R B, Krticka, M, McNabb, D P, Sleaford, B, Agvaanluvsan, U, Belgya, T, and Revay, Zs. Thermal Neutron Capture Cross Sections of the PalladiumIsotopes. United States: N. p., 2006. Web.
Firestone, R B, Krticka, M, McNabb, D P, Sleaford, B, Agvaanluvsan, U, Belgya, T, & Revay, Zs. Thermal Neutron Capture Cross Sections of the PalladiumIsotopes. United States.
Firestone, R B, Krticka, M, McNabb, D P, Sleaford, B, Agvaanluvsan, U, Belgya, T, and Revay, Zs. Mon . "Thermal Neutron Capture Cross Sections of the PalladiumIsotopes". United States. https://www.osti.gov/servlets/purl/925521.
@article{osti_925521,
title = {Thermal Neutron Capture Cross Sections of the PalladiumIsotopes},
author = {Firestone, R B and Krticka, M and McNabb, D P and Sleaford, B and Agvaanluvsan, U and Belgya, T and Revay, Zs},
abstractNote = {Precise gamma-ray thermal neutron capture cross sectionshave been measured at the Budapest Reactor for all elements withZ=1-83,92 except for He and Pm. These measurements and additional datafrom the literature been compiled to generate the Evaluated Gamma-rayActivation File (EGAF), which is disseminated by LBNL and the IAEA. Thesedata are nearly complete for most isotopes with Z<20 so the totalradiative thermal neutron capture cross sections can be determineddirectly from the decay scheme. For light isotopes agreement with therecommended values is generally satisfactory although large discrepanciesexist for 11B, 12,13C, 15N, 28,30Si, 34S, 37Cl, and 40,41K. Neutroncapture decay data for heavier isotopes are typically incomplete due tothe contribution of unresolved continuum transitions so only partialradiative thermal neutron capture cross sections can be determined. Thecontribution of the continuum to theneutron capture decay scheme arisesfrom a large number of unresolved levels and transitions and can becalculated by assuming that the fluctuations in level densities andtransition probabilities are statistical. We have calculated thecontinuum contribution to neutron capture decay for the palladiumisotopes with the Monte Carlo code DICEBOX. These calculations werenormalized to the experimental cross sections deexciting low excitationlevels to determine the total radiative thermal neutron capture crosssection. The resulting palladium cross sections values were determinedwith a precision comparable to the recommended values even when only onegamma-ray cross section was measured. The calculated and experimentallevel feedings could also be compared to determine spin and parityassignments for low-lying levels.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2006},
month = {7}
}

Conference:
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