Prompt fission product yields in the U238(n,f) reaction

Fotiadis, Nikolaos; Casoli, Pierre; Jaffke, Patrick John; Devlin, Matthew James; Nelson, Ronald Owen; Granier, Thierry; Talou, Patrick; Ethvignot, Thierry

doi:10.1103/PhysRevC.99.024606

Title: Prompt fission product yields in the ${}^{238}U (n, f)$ reaction

Abstract

Background: Significant yield discrepancies (500-600%) were reported recently between experi- mental results and predictions (from the GEF model) and evaluations (from the JEFF-3.1.1 and ENDF/B-VII.1 libraries) for Mo and Sn fission-fragment yields in fast-neutron induced reactions on ²³⁸U using γ-γ-γ coincidence spectroscopy. The model/evaluations also predict Mo and Sn fragments that are on average ~1 to 2 neutrons richer than the experimental results. Purpose: γ-γ-γ coincidence spectroscopy favors detection of higher-multiplicity γ-ray cascades. An alternative approach is determining the fragment yields using single-γ-ray spectroscopy, as it was attempted here for selected cases where it was feasible. Advantages/drawbacks in both approaches need to be understood and potential systematic errors in the experimental results should be addressed using theoretical models. Methods: Fast neutrons from the LANSCE WNR facility were used to induce fission on ²³⁸U. The emitted γ rays were measured with the GEANIE spectrometer. Results: The yield of selected even-even fission fragments was determined. The selection was based on the ability to reliably determine excitation functions for the detected γ rays. Conclusions: Our single-γ-ray results provide better agreement between experiment and predictions/evaluations.

Authors:

^[1]; Casoli, Pierre ^[2];

^[1];

^[1]; Granier, Thierry ^[3];

^[1]; Ethvignot, Thierry ^[4]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA), Saclay (France); Univ. Paris-Saclay, Gif-sur-Yvette (France). Den-SERMA
Autorité de Sûreté Nucléaire, Montrouge (France)
Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)

Publication Date:: Tue Feb 05 00:00:00 EST 2019

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

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

OSTI Identifier:: 1495151

Alternate Identifier(s):: OSTI ID: 1493512

Report Number(s):: LA-UR-18-23000
Journal ID: ISSN 2469-9985; PRVCAN

Grant/Contract Number:: 89233218CNA000001; W-7405-ENG-36; AC52-06NA25396; W-7405-ENG-48; AC52-07NA27344

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 99; Journal Issue: 2; Journal ID: ISSN 2469-9985

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Fotiadis, Nikolaos, Casoli, Pierre, Jaffke, Patrick John, Devlin, Matthew James, Nelson, Ronald Owen, Granier, Thierry, Talou, Patrick, and Ethvignot, Thierry. Prompt fission product yields in the U238(n,f) reaction.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevC.99.024606.

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                    Fotiadis, Nikolaos, Casoli, Pierre, Jaffke, Patrick John, Devlin, Matthew James, Nelson, Ronald Owen, Granier, Thierry, Talou, Patrick, & Ethvignot, Thierry. Prompt fission product yields in the U238(n,f) reaction.  United States.  https://doi.org/10.1103/PhysRevC.99.024606

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                    Fotiadis, Nikolaos, Casoli, Pierre, Jaffke, Patrick John, Devlin, Matthew James, Nelson, Ronald Owen, Granier, Thierry, Talou, Patrick, and Ethvignot, Thierry. Tue .  
"Prompt fission product yields in the U238(n,f) reaction".  United States.  https://doi.org/10.1103/PhysRevC.99.024606.  https://www.osti.gov/servlets/purl/1495151.

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@article{osti_1495151,

  title        = {Prompt fission product yields in the U238(n,f) reaction},

  author       = {Fotiadis, Nikolaos and Casoli, Pierre and Jaffke, Patrick John and Devlin, Matthew James and Nelson, Ronald Owen and Granier, Thierry and Talou, Patrick and Ethvignot, Thierry},

  abstractNote = {Background: Significant yield discrepancies (500-600%) were reported recently between experi- mental results and predictions (from the GEF model) and evaluations (from the JEFF-3.1.1 and ENDF/B-VII.1 libraries) for Mo and Sn fission-fragment yields in fast-neutron induced reactions on 238U using γ-γ-γ coincidence spectroscopy. The model/evaluations also predict Mo and Sn fragments that are on average ~1 to 2 neutrons richer than the experimental results. Purpose: γ-γ-γ coincidence spectroscopy favors detection of higher-multiplicity γ-ray cascades. An alternative approach is determining the fragment yields using single-γ-ray spectroscopy, as it was attempted here for selected cases where it was feasible. Advantages/drawbacks in both approaches need to be understood and potential systematic errors in the experimental results should be addressed using theoretical models. Methods: Fast neutrons from the LANSCE WNR facility were used to induce fission on 238U. The emitted γ rays were measured with the GEANIE spectrometer. Results: The yield of selected even-even fission fragments was determined. The selection was based on the ability to reliably determine excitation functions for the detected γ rays. Conclusions: Our single-γ-ray results provide better agreement between experiment and predictions/evaluations.},

  doi          = {10.1103/PhysRevC.99.024606},

  journal      = {Physical Review C},

  number       = 2,

  volume       = 99,

  place        = {United States},

  year         = {Tue Feb 05 00:00:00 EST 2019},

  month        = {Tue Feb 05 00:00:00 EST 2019}

}

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Works referencing / citing this record:

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journal, August 2019

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Physical Review Letters, Vol. 123, Issue 9
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Title: Prompt fission product yields in the U 238 ( n , f ) reaction

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Nuclear Data Sheets for A = 95 journal, October 2010

Nuclear Data Sheets for A = 136 journal, April 2002

Transition from asymmetric to symmetric fission in the 235 U ( n , f ) reaction journal, October 2001

Near-yrast, medium-spin, excited states of Rb 91 , Rb 93 , and Rb 95 journal, August 2010

Nuclear Data Sheets for A = 99 journal, November 2017

Nuclear Data Sheets for A = 103 journal, September 2009

Nuclear Data Sheets for A = 105 journal, August 2005

Nuclear Data Sheets for A = 145 journal, March 2009

Rotational bands in the mass 100 region journal, July 1991

General Description of Fission Observables: GEF Model Code journal, January 2016

The Miniball spectrometer journal, March 2013

Monte Carlo Hauser-Feshbach predictions of prompt fission γ rays: Application to n th + 235 U, n th + 239 Pu, and 252 Cf (sf) journal, January 2013

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

Properties of prompt-fission γ rays journal, August 2014

Late-time emission of prompt fission γ rays journal, December 2016

Investigation of the fission fragment properties of the reaction 238U(n,f) at incident neutron energies up to 5.8 MeV journal, January 2000

Properties of the reaction 238U at the vibrational resonances journal, February 2009

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

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

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

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

First Direct Measurement of Isotopic Fission-Fragment Yields of U 239 journal, August 2019

Title: Prompt fission product yields in the ${}^{238}U (n, f)$ reaction

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

Gamma rays from fission fragments
journal, November 1995

New insights from studies of spontaneous fission with large detector arrays
journal, January 1995

High-Spin Studies of Fission Products in Fusion-Evaporation Reactions
journal, January 2000

Fission fragment properties obtained in the γ - γ - γ coincidence method in the reaction 208Pb(18O, f )
journal, October 2007

Fragment yields from the fission of 238U by fast neutrons
journal, November 1998

Mass distributions in monoenergetic-neutron-induced fission of ${}^{238}U$
journal, January 1978

Fission Product Yields of 233U, 235U, 238U and 239Pu in Fields of Thermal Neutrons, Fission Neutrons and 14.7-MeV Neutrons
journal, December 2010

Measurement of prompt X-rays in 238U(n,f) from threshold to 400 MeV: Investigation of fission charge yield evolution
journal, September 2013

Anomalies in the Charge Yields of Fission Fragments from the ${}^{238}{U (n, f)}$ Reaction
journal, June 2017

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

The Los Alamos National Laboratory Spallation Neutron Sources
journal, October 1990

The Los Alamos Neutron Science Center
journal, June 2006

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

Intermediate-Energy Neutron-Induced Fission of Uranium: Product Yields and Isomer Studies
journal, August 2002

Nuclear Data Sheets for A = 92
journal, October 2012

Nuclear Data Sheets for A = 94
journal, September 2006

Nuclear Data Sheets for A = 96
journal, November 2008

Nuclear Data Sheets for A = 98
journal, February 2003

Nuclear Data Sheets for A = 100
journal, February 2008

Nuclear Data Sheets for A = 102
journal, August 2009

Nuclear Data Sheets for A = 104
journal, October 2007

Nuclear Data Sheets for A = 106
journal, April 2008

Nuclear Data Sheets for A = 128
journal, November 2015

Nuclear Data Sheets for
journal, March 2005

Nuclear Data Sheets for A = 134
journal, September 2004

Nuclear Data Sheets for A = 138
journal, March 2003

Nuclear Data Sheets for A = 140
journal, July 2007

Nuclear Data Sheets for A = 146
journal, September 2016

Nuclear Data Sheets for A = 148
journal, March 2014

Nuclear Data Sheets for
journal, April 2013

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

Nuclear structure of the closed subshell nucleus $^{90} Zr$ studied with the ${(n, n}^{'} γ)$ reaction
journal, August 2003

High-spin states in ${}^{135}{Xe}$
journal, May 2007

States built on the 10 $^{+}$ isomers in $^{118, 120, 122, 124}$ Sn
journal, November 2011

Nuclea Data Sheets for A = 101
journal, January 1998

Nuclear Data Sheets for A = 107
journal, June 2008

Nuclear Data Sheets for A = 130
journal, May 2001

Nuclear Data Sheets for A = 95
journal, October 2010

Nuclear Data Sheets for A = 136
journal, April 2002

Transition from asymmetric to symmetric fission in the $^{235} U (n, f)$ reaction
journal, October 2001

Near-yrast, medium-spin, excited states of ${}^{91}{Rb}$ , ${}^{93}{Rb}$ , and ${}^{95}{Rb}$
journal, August 2010

Nuclear Data Sheets for A = 99
journal, November 2017

Nuclear Data Sheets for A = 103
journal, September 2009

Nuclear Data Sheets for A = 105
journal, August 2005

Nuclear Data Sheets for A = 145
journal, March 2009

Rotational bands in the mass 100 region
journal, July 1991

General Description of Fission Observables: GEF Model Code
journal, January 2016

The Miniball spectrometer
journal, March 2013

Monte Carlo Hauser-Feshbach predictions of prompt fission $γ$ rays: Application to $n_{th} +^{235}$ U, $n_{th} +^{239}$ Pu, and $^{252}$ Cf (sf)
journal, January 2013

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

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

Late-time emission of prompt fission $γ$ rays
journal, December 2016

Investigation of the fission fragment properties of the reaction 238U(n,f) at incident neutron energies up to 5.8 MeV
journal, January 2000

Properties of the reaction 238U at the vibrational resonances
journal, February 2009

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

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

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

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

First Direct Measurement of Isotopic Fission-Fragment Yields of ${}^{239}U$
journal, August 2019