Late-time emission of prompt fission γ rays

Talou, Patrick; Kawano, Toshihiko; Stetcu, Ionel; Lestone, John Paul; McKigney, Edward Allen; Chadwick, Mark Benjamin

doi:10.1103/PhysRevC.94.064613

Title: Late-time emission of prompt fission $γ$ rays

Abstract

The emission of prompt fission γ rays within a few nanoseconds to a few microseconds following the scission point is studied in the Hauser-Feshbach formalism applied to the deexcitation of primary excited fission fragments. Neutron and γ-ray evaporations from fully accelerated fission fragments are calculated in competition at each stage of the decay, and the role of isomers in the fission products, before β decay, is analyzed. The time evolution of the average total γ-ray energy, the average total γ-ray multiplicity, and the fragment-specific γ-ray spectra is presented in the case of neutron-induced fission reactions of ²³⁵U and ²³⁹Pu, as well as spontaneous fission of ²⁵²Cf. The production of specific isomeric states is calculated and compared to available experimental data. About 7% of all prompt fission γ rays are predicted to be emitted between 10 ns and 5 μs following fission, in the case of ²³⁵U and ²³⁹Pu(_ⁿth,f) reactions, and up to 3% in the case of ²⁵²Cf spontaneous fission. The cumulative average total γ-ray energy increases by 2% to 5% in the same time interval. Lastly, those results are shown to be robust against significant changes in the model input parameters.

Authors:

Talou, Patrick ^[1]; Kawano, Toshihiko ^[1]; Stetcu, Ionel ^[1]; Lestone, John Paul ^[1]; McKigney, Edward Allen ^[1]; Chadwick, Mark Benjamin ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:: Thu Dec 22 00:00:00 EST 2016

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

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation

OSTI Identifier:: 1343702

Alternate Identifier(s):: OSTI ID: 1337442

Report Number(s):: LA-UR-16-24045
Journal ID: ISSN 2469-9985; PRVCAN; TRN: US1701102

Grant/Contract Number:: AC52-06NA25396

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 94; Journal Issue: 6; Journal ID: ISSN 2469-9985

Publisher:: APS

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Talou, Patrick, Kawano, Toshihiko, Stetcu, Ionel, Lestone, John Paul, McKigney, Edward Allen, and Chadwick, Mark Benjamin. Late-time emission of prompt fission γ rays.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevC.94.064613.

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                    Talou, Patrick, Kawano, Toshihiko, Stetcu, Ionel, Lestone, John Paul, McKigney, Edward Allen, & Chadwick, Mark Benjamin. Late-time emission of prompt fission γ rays.  United States.  https://doi.org/10.1103/PhysRevC.94.064613

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                    Talou, Patrick, Kawano, Toshihiko, Stetcu, Ionel, Lestone, John Paul, McKigney, Edward Allen, and Chadwick, Mark Benjamin. Thu .  
"Late-time emission of prompt fission γ rays".  United States.  https://doi.org/10.1103/PhysRevC.94.064613.  https://www.osti.gov/servlets/purl/1343702.

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@article{osti_1343702,

  title        = {Late-time emission of prompt fission γ rays},

  author       = {Talou, Patrick and Kawano, Toshihiko and Stetcu, Ionel and Lestone, John Paul and McKigney, Edward Allen and Chadwick, Mark Benjamin},

  abstractNote = {The emission of prompt fission γ rays within a few nanoseconds to a few microseconds following the scission point is studied in the Hauser-Feshbach formalism applied to the deexcitation of primary excited fission fragments. Neutron and γ-ray evaporations from fully accelerated fission fragments are calculated in competition at each stage of the decay, and the role of isomers in the fission products, before β decay, is analyzed. The time evolution of the average total γ-ray energy, the average total γ-ray multiplicity, and the fragment-specific γ-ray spectra is presented in the case of neutron-induced fission reactions of 235U and 239Pu, as well as spontaneous fission of 252Cf. The production of specific isomeric states is calculated and compared to available experimental data. About 7% of all prompt fission γ rays are predicted to be emitted between 10 ns and 5 μs following fission, in the case of 235U and 239Pu(nth,f) reactions, and up to 3% in the case of 252Cf spontaneous fission. The cumulative average total γ-ray energy increases by 2% to 5% in the same time interval. Lastly, those results are shown to be robust against significant changes in the model input parameters.},

  doi          = {10.1103/PhysRevC.94.064613},

  journal      = {Physical Review C},

  number       = 6,

  volume       = 94,

  place        = {United States},

  year         = {Thu Dec 22 00:00:00 EST 2016},

  month        = {Thu Dec 22 00:00:00 EST 2016}

}

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Works referenced in this record:

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Works referencing / citing this record:

Review on the progress in nuclear fission—experimental methods and theoretical descriptions
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Schmidt, Karl-Heinz; Jurado, Beatriz
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Title: Late-time emission of prompt fission γ rays

Abstract

Citation Formats

New isomeric states in 152,154,156Nd produced by spontaneous fission of 252Cf journal, April 1998

Angular Momentum of Primary Products Formed in the Spontaneous Fission of Cf 252 journal, June 1972

Systematics of prompt γ -ray emission in fission journal, March 2013

Properties of prompt-fission γ rays journal, August 2014

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

RIPL – Reference Input Parameter Library for Calculation of Nuclear Reactions and Nuclear Data Evaluations journal, December 2009

Interpretation of Isomeric Cross-Section Ratios for ( n , γ ) and ( γ , n ) Reactions journal, November 1960

Four-Parameter Measurements of Isomeric Transitions in Cf 252 Fission Fragments journal, October 1970

Measurement of prompt neutron spectra from the 239 Pu( n , f ) fission reaction for incident neutron energies from 1 to 200 MeV journal, January 2014

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

New excitation scheme of 139Cs journal, September 1999

Angular momentum of fission fragments in low energy fission of actinides journal, January 2005

Simultaneous investigation of fission fragments and neutrons in 252Cf (SF) journal, December 1988

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

Advanced Monte Carlo modeling of prompt fission neutrons for thermal and fast neutron-induced fission reactions on Pu 239 journal, June 2011

Impact of low-energy photons on the characteristics of prompt fission γ -ray spectra journal, July 2015

Isomer production ratios and the angular momentum distribution of fission fragments journal, October 2013

Nuclear ground-state masses and deformations: FRDM(2012) journal, May 2016

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

Evaluation of prompt fission gamma rays for use in simulating nuclear safeguard measurements journal, February 2001

Structure of neutron-rich nuclei and rare processes in spontaneous fission of conference, January 1998

Prompt Gamma Rays from U 235 ( n , f ) , Pu 239 ( n , f ) , and Spontaneous Fission of Cf 252 journal, March 1973

The Ame2012 atomic mass evaluation journal, December 2012

Physics with Gammasphere journal, June 1998

Isomers in Fission Fragments conference, January 2009

Isomeric gamma rays from U 235 ( n , f ) and Pu 239 ( n , f ) for times less than 1 μsec after fission journal, August 1974

Total prompt γ -ray emission in fission of U 235 , Pu 239 , 241 , and Cf 252 journal, July 2014

EUROGAM — A high efficiency escape suppressed spectrometer array journal, December 1990

The Inelastic Scattering of Neutrons journal, July 1952

Reanalysis of 239Pu Prompt Fission Neutron Spectra journal, January 2015

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

New prompt spectral γ -ray data from the reaction 252 Cf(sf) and its implication on present evaluated nuclear data files journal, February 2013

The Ame2012 atomic mass evaluation journal, December 2012

Review on the progress in nuclear fission—experimental methods and theoretical descriptions journal, September 2018

High resolution measurement of tagged two-neutron energy and angle correlations in Cf 252 (sf) journal, July 2019

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Correlated Prompt Fission Data in Transport Simulations text, January 2017

Title: Late-time emission of prompt fission $γ$ rays

New isomeric states in 152,154,156Nd produced by spontaneous fission of 252Cf
journal, April 1998

Angular Momentum of Primary Products Formed in the Spontaneous Fission of ${}^{252}{Cf}$
journal, June 1972

Systematics of prompt $γ$ -ray emission in fission
journal, March 2013

Properties of prompt-fission $γ$ rays
journal, August 2014

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

RIPL – Reference Input Parameter Library for Calculation of Nuclear Reactions and Nuclear Data Evaluations
journal, December 2009

Interpretation of Isomeric Cross-Section Ratios for ( $n, γ$ ) and ( $γ, n$ ) Reactions
journal, November 1960

Four-Parameter Measurements of Isomeric Transitions in ${}^{252}{Cf}$ Fission Fragments
journal, October 1970

Measurement of prompt neutron spectra from the $^{239}$ Pu( $n$ , $f$ ) fission reaction for incident neutron energies from 1 to 200 MeV
journal, January 2014

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

New excitation scheme of 139Cs
journal, September 1999

Angular momentum of fission fragments in low energy fission of actinides
journal, January 2005

Simultaneous investigation of fission fragments and neutrons in 252Cf (SF)
journal, December 1988

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

Advanced Monte Carlo modeling of prompt fission neutrons for thermal and fast neutron-induced fission reactions on ${}^{239}{Pu}$
journal, June 2011

Impact of low-energy photons on the characteristics of prompt fission $γ$ -ray spectra
journal, July 2015

Isomer production ratios and the angular momentum distribution of fission fragments
journal, October 2013

Nuclear ground-state masses and deformations: FRDM(2012)
journal, May 2016

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

Evaluation of prompt fission gamma rays for use in simulating nuclear safeguard measurements
journal, February 2001

Structure of neutron-rich nuclei and rare processes in spontaneous fission of
conference, January 1998

Prompt Gamma Rays from ${}^{235}U (n, f)$ , ${}^{239}{Pu} (n, f)$ , and Spontaneous Fission of ${}^{252}{Cf}$
journal, March 1973

The Ame2012 atomic mass evaluation
journal, December 2012

Physics with Gammasphere
journal, June 1998

Isomers in Fission Fragments
conference, January 2009

Isomeric gamma rays from ${}^{235}U (n, f)$ and ${}^{239}{Pu} (n, f)$ for times less than 1 μsec after fission
journal, August 1974

Total prompt $γ$ -ray emission in fission of ${}^{235}U$ , ${}^{239, 241}{Pu}$ , and ${}^{252}{Cf}$
journal, July 2014

EUROGAM — A high efficiency escape suppressed spectrometer array
journal, December 1990

The Inelastic Scattering of Neutrons
journal, July 1952

Reanalysis of 239Pu Prompt Fission Neutron Spectra
journal, January 2015

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

New prompt spectral $γ$ -ray data from the reaction $^{252}$ Cf(sf) and its implication on present evaluated nuclear data files
journal, February 2013

The Ame2012 atomic mass evaluation
journal, December 2012

Review on the progress in nuclear fission—experimental methods and theoretical descriptions
journal, September 2018

High resolution measurement of tagged two-neutron energy and angle correlations in ${}^{252}{Cf}$ (sf)
journal, July 2019

Correlated prompt fission data in transport simulations
journal, January 2018

Correlated Prompt Fission Data in Transport Simulations
text, January 2017