Feeding of Rh and Ag isomers in fast-neutron-induced reactions

Fotiades, Nikolaos; Devlin, Matthew James; Nelson, Ronald Owen; Kawano, T.; Carroll, J. J.

doi:10.1103/PhysRevC.94.044608

Title: Feeding of Rh and Ag isomers in fast-neutron-induced reactions

Abstract

In (n,n') reactions on stable Ir and Au isotopes in the mass A=190 region, the experimentally established feeding of the isomers relative to the feeding of the corresponding ground states increases with increasing neutron energy, up to the neutron energy where the (n,2n) reaction channel opens up, and then decreases. In order to check for similar behavior in the mass A=100 region, the feeding of isomers and ground states in fast-neutron-induced reactions on stable isotopes in this mass region was studied. This is of especial interest for Rh which can be used as a radiochemical detector. Here, excited states were studied using the (n,n'γ), (n,2nγ), and (n,3nγ) reactions on ¹⁰³Rh and ¹⁰⁹Ag. A germanium detector array for γ-ray detection and the broad-spectrum pulsed neutron source of the Los Alamos Neutron Science Center's Weapons Neutron Research facility were used for the measurement. The energy of the incident neutrons was determined using the time-of-flight technique. Absolute partial γ-ray cross sections were measured for 57 transitions feeding isomers and ground states in ^101,102,103Rh and ^107,108,109Ag. The feeding of the isomers was found to be very similar in the corresponding reaction channels and it is compared to the feeding determined for the ground states.more »« less

Authors:

^[1];

^[1]; Nelson, Ronald Owen ^[1]; Kawano, T. ^[1]; Carroll, J. J. ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
U.S. Army Research Lab., Adelphi, MD (United States)

Publication Date:: Mon Oct 17 00:00:00 EDT 2016

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1346842

Alternate Identifier(s):: OSTI ID: 1329099

Report Number(s):: LA-UR-16-26892
Journal ID: ISSN 2469-9985; PRVCAN; TRN: US1701373

Grant/Contract Number:: AC52-06NA25396

Resource Type:: Journal Article: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 94; Journal Issue: 4; Journal ID: ISSN 2469-9985

Publisher:: APS

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Fotiades, Nikolaos, Devlin, Matthew James, Nelson, Ronald Owen, Kawano, T., and Carroll, J. J. Feeding of Rh and Ag isomers in fast-neutron-induced reactions.  United States: N. p., 2016. 
        Web.  doi:10.1103/PhysRevC.94.044608.

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                    Fotiades, Nikolaos, Devlin, Matthew James, Nelson, Ronald Owen, Kawano, T., & Carroll, J. J. Feeding of Rh and Ag isomers in fast-neutron-induced reactions.  United States.  https://doi.org/10.1103/PhysRevC.94.044608

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                    Fotiades, Nikolaos, Devlin, Matthew James, Nelson, Ronald Owen, Kawano, T., and Carroll, J. J. 2016.  
        "Feeding of Rh and Ag isomers in fast-neutron-induced reactions".  United States.  https://doi.org/10.1103/PhysRevC.94.044608.  https://www.osti.gov/servlets/purl/1346842.

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@article{osti_1346842,

  title        = {Feeding of Rh and Ag isomers in fast-neutron-induced reactions},

  author       = {Fotiades, Nikolaos and Devlin, Matthew James and Nelson, Ronald Owen and Kawano, T. and Carroll, J. J.},

  abstractNote = {In (n,n') reactions on stable Ir and Au isotopes in the mass A=190 region, the experimentally established feeding of the isomers relative to the feeding of the corresponding ground states increases with increasing neutron energy, up to the neutron energy where the (n,2n) reaction channel opens up, and then decreases. In order to check for similar behavior in the mass A=100 region, the feeding of isomers and ground states in fast-neutron-induced reactions on stable isotopes in this mass region was studied. This is of especial interest for Rh which can be used as a radiochemical detector. Here, excited states were studied using the (n,n'γ), (n,2nγ), and (n,3nγ) reactions on 103Rh and 109Ag. A germanium detector array for γ-ray detection and the broad-spectrum pulsed neutron source of the Los Alamos Neutron Science Center's Weapons Neutron Research facility were used for the measurement. The energy of the incident neutrons was determined using the time-of-flight technique. Absolute partial γ-ray cross sections were measured for 57 transitions feeding isomers and ground states in 101,102,103Rh and 107,108,109Ag. The feeding of the isomers was found to be very similar in the corresponding reaction channels and it is compared to the feeding determined for the ground states. In conclusion, the opening of reaction channels at higher neutron energies removes angular momentum from the residual nucleus and reduces the population of the higher-spin isomers relative to the feeding of the lower-spin ground states. Similar behavior was observed in the mass A=190 region in the feeding of higher-spin isomers, but the reverse behavior was observed in 176Lu with a lower-spin isomer and a higher-spin ground state.},

  doi          = {10.1103/PhysRevC.94.044608},

  url          = {https://www.osti.gov/biblio/1346842},
  journal      = {Physical Review C},

  issn         = {2469-9985},

  number       = 4,

  volume       = 94,

  place        = {United States},

  year         = {Mon Oct 17 00:00:00 EDT 2016},

  month        = {Mon Oct 17 00:00:00 EDT 2016}

}

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Title: Feeding of Rh and Ag isomers in fast-neutron-induced reactions

Abstract

Citation Formats

Nuclear Data Sheets for A = 190 journal, June 2003

Total cross sections and isomeric cross-section ratios for (n, 2n) reactions in the energy region 12–18 MeV journal, November 1970

Nuclear Data Sheets for A = 192 journal, August 2012

Monte Carlo Simulation for Particle and γ-Ray Emissions in Statistical Hauser-Feshbach Model journal, May 2010

Nuclear Data Sheets for A = 191 journal, November 2007

Nuclear Data Sheets for A = 176 journal, April 2006

Nuclear Data Sheets for A = 193 journal, January 2006

Local and global nucleon optical models from 1 keV to 200 MeV journal, January 2003

Nuclear Data Sheets for A = 102 journal, August 2009

αand2p2nemission in fast neutron-induced reactions onNi60 journal, June 2015

New Physics Opportunities with GEANIE at LANSCE/WNR journal, January 1997

A fission ionization detector for neutron flux measurements at a spallation source journal, November 1993

ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data journal, December 2011

Nuclear Data Sheets for A = 189 journal, September 2003

Nuclear Ground-State Masses and Deformations journal, March 1995

Nuclear Data Sheets for A = 108 journal, October 2000

Nuclear Data Sheets for A = 107 journal, June 2008

Nuclear Data Sheets for A = 196 journal, June 2007

A Composite Nuclear-Level Density Formula with Shell Corrections journal, August 1965

Nuclear Data Sheets for A=197 journal, February 2005

Nuclear Data Sheets for A = 109 journal, February 2006

Complementary optical-potential analysis of -particle elastic scattering and induced reactions at low energies journal, July 2009

The Los Alamos Neutron Science Center journal, June 2006

Coupled-channels Optical Model Analyses of Nucleon-induced Reactions for Medium and Heavy Nuclei in the Energy Region from 1 keV to 200 MeV journal, June 2007

Nuclear Data Sheets for A = 195 journal, September 2014

A global pre-equilibrium analysis from 7 to 200 MeV based on the optical model potential journal, November 2004

Measurements and calculations of U 238 ( n , x n γ ) partial γ -ray cross sections journal, February 2004

Nuclear Data Sheets for A = 103 journal, September 2009

Feeding of the 11 / 2 − isomers in stable Ir and Au isotopes journal, October 2009

Elastic deuteron scattering and optical model parameters at energies up to 100 MeV journal, September 1988

Nuclea Data Sheets for A = 101 journal, January 1998

Challenges beyond Hauser-Feshbach for nuclear reaction modeling journal, December 2015

Phenomenological Nuclear Level Densities using the KTUY05 Nuclear Mass Formula for Applications Off-Stability journal, January 2006

Test of gamma-ray strength functions in nuclear reaction model calculations journal, May 1990

Nuclear Data Sheets for A = 190
journal, June 2003

Total cross sections and isomeric cross-section ratios for (n, 2n) reactions in the energy region 12–18 MeV
journal, November 1970

Nuclear Data Sheets for A = 192
journal, August 2012

Monte Carlo Simulation for Particle and γ-Ray Emissions in Statistical Hauser-Feshbach Model
journal, May 2010

Nuclear Data Sheets for A = 191
journal, November 2007

Nuclear Data Sheets for A = 176
journal, April 2006

Nuclear Data Sheets for A = 193
journal, January 2006

Local and global nucleon optical models from 1 keV to 200 MeV
journal, January 2003

Nuclear Data Sheets for A = 102
journal, August 2009

αand2p2nemission in fast neutron-induced reactions onNi60
journal, June 2015

New Physics Opportunities with GEANIE at LANSCE/WNR
journal, January 1997

A fission ionization detector for neutron flux measurements at a spallation source
journal, November 1993

ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data
journal, December 2011

Nuclear Data Sheets for A = 189
journal, September 2003

Nuclear Ground-State Masses and Deformations
journal, March 1995

Nuclear Data Sheets for A = 108
journal, October 2000

Nuclear Data Sheets for A = 107
journal, June 2008

Nuclear Data Sheets for A = 196
journal, June 2007

A Composite Nuclear-Level Density Formula with Shell Corrections
journal, August 1965

Nuclear Data Sheets for A=197
journal, February 2005

Nuclear Data Sheets for A = 109
journal, February 2006

Complementary optical-potential analysis of -particle elastic scattering and induced reactions at low energies
journal, July 2009

The Los Alamos Neutron Science Center
journal, June 2006

Coupled-channels Optical Model Analyses of Nucleon-induced Reactions for Medium and Heavy Nuclei in the Energy Region from 1 keV to 200 MeV
journal, June 2007

Nuclear Data Sheets for A = 195
journal, September 2014

A global pre-equilibrium analysis from 7 to 200 MeV based on the optical model potential
journal, November 2004

Measurements and calculations of ${}^{238}U (n, x n γ)$ partial $γ$ -ray cross sections
journal, February 2004

Nuclear Data Sheets for A = 103
journal, September 2009

Feeding of the $11 / 2^{-}$ isomers in stable Ir and Au isotopes
journal, October 2009

Elastic deuteron scattering and optical model parameters at energies up to 100 MeV
journal, September 1988

Nuclea Data Sheets for A = 101
journal, January 1998

Challenges beyond Hauser-Feshbach for nuclear reaction modeling
journal, December 2015

Phenomenological Nuclear Level Densities using the KTUY05 Nuclear Mass Formula for Applications Off-Stability
journal, January 2006

Test of gamma-ray strength functions in nuclear reaction model calculations
journal, May 1990