New methods for the determination of total radiative thermal neutron capture cross sections

R. B. Firestone, M. Krticka, D. P. McNabb, B. Sleaford, U. Agvaanluvsan, T. Belgya, Zs Revay

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

9 Citations (Scopus)

Abstract

Precise gamma-ray thermal neutron capture cross sections have been measured at the Budapest Reactor for all elements with Z= 1-83,92 except for He and Pm. These measurements and additional data from the literature been compiled to generate the Evaluated Gamma-ray Activation File (EGAF), which is disseminated by LBNL and the IAEA. These data are nearly complete for most isotopes with Z11B, 12,13C, 15N, 28,30Si, 34S, 37Cl, and 40,41K. Neutron capture decay data for heavier isotopes are typically incomplete due to the contribution of unresolved continuum transitions so only partial radiative thermal neutron capture cross sections can be determined. The contribution of the continuum to the neutron capture decay scheme arises from a large number of unresolved levels and transitions and can be calculated by assuming that the fluctuations in level densities and transition probabilities are statistical. We have calculated the continuum contribution to neutron capture decay for the palladium isotopes with the Monte Carlo code DICEBOX. These calculations were normalized to the experimental cross sections deexciting low excitation levels to determine the total radiative thermal neutron capture cross section. The resulting palladium cross sections values were determined with a precision comparable to the recommended values even when only one gamma-ray cross section was measured. The calculated and experimental level feedings could also be compared to determine spin and parity assignments for lowlying levels.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
Pages26-29
Number of pages4
Volume1005
DOIs
Publication statusPublished - 2008
Event2007 International Workshop on Compound-Nuclear Reactions and Related Topics, CNR 2007 - Yosemite National Park, CA, United States
Duration: Oct 22 2007Oct 26 2007

Other

Other2007 International Workshop on Compound-Nuclear Reactions and Related Topics, CNR 2007
CountryUnited States
CityYosemite National Park, CA
Period10/22/0710/26/07

Fingerprint

thermal neutrons
absorption cross sections
gamma rays
continuums
neutrons
palladium isotopes
cross sections
decay
isotopes
files
transition probabilities
palladium
parity
reactors
activation
excitation

Keywords

  • Statistical model calculations
  • Total thermal radiative neutron capture cross sections

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Firestone, R. B., Krticka, M., McNabb, D. P., Sleaford, B., Agvaanluvsan, U., Belgya, T., & Revay, Z. (2008). New methods for the determination of total radiative thermal neutron capture cross sections. In AIP Conference Proceedings (Vol. 1005, pp. 26-29) https://doi.org/10.1063/1.2920738

New methods for the determination of total radiative thermal neutron capture cross sections. / Firestone, R. B.; Krticka, M.; McNabb, D. P.; Sleaford, B.; Agvaanluvsan, U.; Belgya, T.; Revay, Zs.

AIP Conference Proceedings. Vol. 1005 2008. p. 26-29.

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

Firestone, RB, Krticka, M, McNabb, DP, Sleaford, B, Agvaanluvsan, U, Belgya, T & Revay, Z 2008, New methods for the determination of total radiative thermal neutron capture cross sections. in AIP Conference Proceedings. vol. 1005, pp. 26-29, 2007 International Workshop on Compound-Nuclear Reactions and Related Topics, CNR 2007, Yosemite National Park, CA, United States, 10/22/07. https://doi.org/10.1063/1.2920738
Firestone RB, Krticka M, McNabb DP, Sleaford B, Agvaanluvsan U, Belgya T et al. New methods for the determination of total radiative thermal neutron capture cross sections. In AIP Conference Proceedings. Vol. 1005. 2008. p. 26-29 https://doi.org/10.1063/1.2920738
Firestone, R. B. ; Krticka, M. ; McNabb, D. P. ; Sleaford, B. ; Agvaanluvsan, U. ; Belgya, T. ; Revay, Zs. / New methods for the determination of total radiative thermal neutron capture cross sections. AIP Conference Proceedings. Vol. 1005 2008. pp. 26-29
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