Thermal neutron capture cross sections Of the palladium isotopes

R. B. Firestone, M. Krtiáka, D. P. Mcnabb, B. Sleaford, U. Agvaanluvsan, T. Belgya, Zs Révay

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We have measured precise thermal neutron capture γ-ray cross sections cry for all stable Palladium isotopes with the guided thermal neutron beam from the Budapest Reactor. The data were compared with other data from the literature and have been evaluated into the Evaluated Gamma-ray Activation File (EGAF). Total radiative neutron capture cross-sections σ γ can be deduced from the sum of transition cross sections feeding the ground state of each isotope if the decay scheme is complete. The Palladium isotope decay schemes are incomplete, although transitions deexciting low-lying levels are known for each isotope. We have performed Monte Carlo simulations of the Palladium thermal neutron capture deexcitation schemes using the computer code DICEBOX. This program generates level schemes where levels below a critical energy E crit are taken from experiment, and those above E crit are calculated by a random discretization of an a priori known level density formula ρ(E,J π). Level de-excitation branching intensities are taken from experiment for levels below E crit the capture state, or calculated for levels above E crit assuming an a priori photon strength function and applying allowed selection rules and a Porter-Thomas distribution of widths. The advantage of this method is that calculational uncertainties can be investigated systematically. Calculated feeding to levels below E crit can be normalized to the measured cross section deexciting those levels to determine the total radiative neutron cross-section σ γ. In this paper we report the cross section measurements σ γ[ 102Pd(n,γ)]=0. 9±0.3 b, σ γ[ 104Pd(n,γ)=0. 61±0.11 b, σ γ[ 105Pd(n,γ)]=2.1. 1±1.5 b, σ γ[ 106Pd(n,γ)]=0. 36±0.05 b, σ γ[ 108Pd(n,γ)(0)]=7. 6±0.6 b, σ γ[ 108Pd(n,γ)(189)]=0. 185±0.011 b, and σ γ[ 110Pd(n,γ)]= 0.10±0.03 b. We have also determined from our statistical calculations that the neutron capture states in 107Pd are best described as 2 +[59(4)%]+3 +[41(4)%]. Agreement with literature values was excellent in most cases. We found significant discrepancies between our results for 102Pd and 110Pd and earlier values that could be resolved by re-evaluation of the earlier results.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
Pages389-395
Number of pages7
Volume819
DOIs
Publication statusPublished - Mar 13 2006
Event12th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics - Notre Dame, IN, United States
Duration: Sep 4 2005Sep 9 2005

Other

Other12th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics
CountryUnited States
CityNotre Dame, IN
Period9/4/059/9/05

Fingerprint

palladium isotopes
thermal neutrons
absorption cross sections
cross sections
isotopes
neutrons
neutron cross sections
neutron beams
decay
files
palladium
rays

Keywords

  • Neutron capture on Palladium isotopes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Firestone, R. B., Krtiáka, M., Mcnabb, D. P., Sleaford, B., Agvaanluvsan, U., Belgya, T., & Révay, Z. (2006). Thermal neutron capture cross sections Of the palladium isotopes. In AIP Conference Proceedings (Vol. 819, pp. 389-395) https://doi.org/10.1063/1.2187890

Thermal neutron capture cross sections Of the palladium isotopes. / Firestone, R. B.; Krtiáka, M.; Mcnabb, D. P.; Sleaford, B.; Agvaanluvsan, U.; Belgya, T.; Révay, Zs.

AIP Conference Proceedings. Vol. 819 2006. p. 389-395.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Firestone, RB, Krtiáka, M, Mcnabb, DP, Sleaford, B, Agvaanluvsan, U, Belgya, T & Révay, Z 2006, Thermal neutron capture cross sections Of the palladium isotopes. in AIP Conference Proceedings. vol. 819, pp. 389-395, 12th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics, Notre Dame, IN, United States, 9/4/05. https://doi.org/10.1063/1.2187890
Firestone RB, Krtiáka M, Mcnabb DP, Sleaford B, Agvaanluvsan U, Belgya T et al. Thermal neutron capture cross sections Of the palladium isotopes. In AIP Conference Proceedings. Vol. 819. 2006. p. 389-395 https://doi.org/10.1063/1.2187890
Firestone, R. B. ; Krtiáka, M. ; Mcnabb, D. P. ; Sleaford, B. ; Agvaanluvsan, U. ; Belgya, T. ; Révay, Zs. / Thermal neutron capture cross sections Of the palladium isotopes. AIP Conference Proceedings. Vol. 819 2006. pp. 389-395
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N2 - We have measured precise thermal neutron capture γ-ray cross sections cry for all stable Palladium isotopes with the guided thermal neutron beam from the Budapest Reactor. The data were compared with other data from the literature and have been evaluated into the Evaluated Gamma-ray Activation File (EGAF). Total radiative neutron capture cross-sections σ γ can be deduced from the sum of transition cross sections feeding the ground state of each isotope if the decay scheme is complete. The Palladium isotope decay schemes are incomplete, although transitions deexciting low-lying levels are known for each isotope. We have performed Monte Carlo simulations of the Palladium thermal neutron capture deexcitation schemes using the computer code DICEBOX. This program generates level schemes where levels below a critical energy E crit are taken from experiment, and those above E crit are calculated by a random discretization of an a priori known level density formula ρ(E,J π). Level de-excitation branching intensities are taken from experiment for levels below E crit the capture state, or calculated for levels above E crit assuming an a priori photon strength function and applying allowed selection rules and a Porter-Thomas distribution of widths. The advantage of this method is that calculational uncertainties can be investigated systematically. Calculated feeding to levels below E crit can be normalized to the measured cross section deexciting those levels to determine the total radiative neutron cross-section σ γ. In this paper we report the cross section measurements σ γ[ 102Pd(n,γ)]=0. 9±0.3 b, σ γ[ 104Pd(n,γ)=0. 61±0.11 b, σ γ[ 105Pd(n,γ)]=2.1. 1±1.5 b, σ γ[ 106Pd(n,γ)]=0. 36±0.05 b, σ γ[ 108Pd(n,γ)(0)]=7. 6±0.6 b, σ γ[ 108Pd(n,γ)(189)]=0. 185±0.011 b, and σ γ[ 110Pd(n,γ)]= 0.10±0.03 b. We have also determined from our statistical calculations that the neutron capture states in 107Pd are best described as 2 +[59(4)%]+3 +[41(4)%]. Agreement with literature values was excellent in most cases. We found significant discrepancies between our results for 102Pd and 110Pd and earlier values that could be resolved by re-evaluation of the earlier results.

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