### 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}[ ^{102}Pd(n,γ)]=0. 9±0.3 b, σ _{γ}[ ^{104}Pd(n,γ)=0. 61±0.11 b, σ _{γ}[ ^{105}Pd(n,γ)]=2.1. 1±1.5 b, σ _{γ}[ ^{106}Pd(n,γ)]=0. 36±0.05 b, σ _{γ}[ ^{108}Pd(n,γ)(0)]=7. 6±0.6 b, σ _{γ}[ ^{108}Pd(n,γ)(189)]=0. 185±0.011 b, and σ _{γ}[ ^{110}Pd(n,γ)]= 0.10±0.03 b. We have also determined from our statistical calculations that the neutron capture states in ^{107}Pd 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 ^{102}Pd and ^{110}Pd and earlier values that could be resolved by re-evaluation of the earlier results.

Original language | English |
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Title of host publication | AIP Conference Proceedings |

Pages | 389-395 |

Number of pages | 7 |

Volume | 819 |

DOIs | |

Publication status | Published - Mar 13 2006 |

Event | 12th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics - Notre Dame, IN, United States Duration: Sep 4 2005 → Sep 9 2005 |

### Other

Other | 12th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics |
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Country | United States |

City | Notre Dame, IN |

Period | 9/4/05 → 9/9/05 |

### Fingerprint

### Keywords

- Neutron capture on Palladium isotopes

### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*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.

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

*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

}

TY - GEN

T1 - Thermal neutron capture cross sections Of the palladium isotopes

AU - Firestone, R. B.

AU - Krtiáka, M.

AU - Mcnabb, D. P.

AU - Sleaford, B.

AU - Agvaanluvsan, U.

AU - Belgya, T.

AU - Révay, Zs

PY - 2006/3/13

Y1 - 2006/3/13

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.

AB - 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.

KW - Neutron capture on Palladium isotopes

UR - http://www.scopus.com/inward/record.url?scp=33751248536&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33751248536&partnerID=8YFLogxK

U2 - 10.1063/1.2187890

DO - 10.1063/1.2187890

M3 - Conference contribution

AN - SCOPUS:33751248536

SN - 0735403139

SN - 9780735403130

VL - 819

SP - 389

EP - 395

BT - AIP Conference Proceedings

ER -