### 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, ^{12,13}C, ^{15}N, ^{28,30}Si, ^{34}S, ^{37}Cl, and ^{40,41}K. 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 language | English |
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Title of host publication | AIP Conference Proceedings |

Pages | 26-29 |

Number of pages | 4 |

Volume | 1005 |

DOIs | |

Publication status | Published - 2008 |

Event | 2007 International Workshop on Compound-Nuclear Reactions and Related Topics, CNR 2007 - Yosemite National Park, CA, United States Duration: Oct 22 2007 → Oct 26 2007 |

### Other

Other | 2007 International Workshop on Compound-Nuclear Reactions and Related Topics, CNR 2007 |
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Country | United States |

City | Yosemite National Park, CA |

Period | 10/22/07 → 10/26/07 |

### Fingerprint

### Keywords

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

### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*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.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*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

}

TY - GEN

T1 - New methods for the determination of total radiative thermal neutron capture cross sections

AU - Firestone, R. B.

AU - Krticka, M.

AU - McNabb, D. P.

AU - Sleaford, B.

AU - Agvaanluvsan, U.

AU - Belgya, T.

AU - Revay, Zs

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

KW - Statistical model calculations

KW - Total thermal radiative neutron capture cross sections

UR - http://www.scopus.com/inward/record.url?scp=43649097878&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=43649097878&partnerID=8YFLogxK

U2 - 10.1063/1.2920738

DO - 10.1063/1.2920738

M3 - Conference contribution

SN - 9780735405240

VL - 1005

SP - 26

EP - 29

BT - AIP Conference Proceedings

ER -