Neutron-neutron angular correlations in spontaneous fission of Cf252 and Pu240

Verbeke, J. M.; Nakae, L. F.; Vogt, R.

doi:10.1103/PhysRevC.97.044601

Title: Neutron-neutron angular correlations in spontaneous fission of ${}^{252}{Cf}$ and ${}^{240}{Pu}$

Abstract

Background: Angular anisotropy has been observed between prompt neutrons emitted during the fission process. Such an anisotropy arises because the emitted neutrons are boosted along the direction of the parent fragment. Purpose: To measure the neutron-neutron angular correlations from the spontaneous fission of ²⁵²Cf and ²⁴⁰Pu oxide samples using a liquid scintillator array capable of pulse-shape discrimination. To compare these correlations to simulations combining the Monte Carlo radiation transport code MCNPX with the fission event generator FREYA. Method: Two different analysis methods were used to study the neutron-neutron correlations with varying energy thresholds. The first is based on setting a light output threshold while the second imposes a time-of-flight cutoff. The second method has the advantage of being truly detector independent. Results: The neutron-neutron correlation modeled by FREYA depends strongly on the sharing of the excitation energy between the two fragments. The measured asymmetry enabled us to adjust the FREYA parameter x in ²⁴⁰Pu , which controls the energy partition between the fragments and is so far inaccessible in other measurements. The ²⁴⁰Pu data in this analysis was the first available to quantify the energy partition for this isotope. The agreement between data and simulation is overall very good formore »« less

Authors:

Verbeke, J. M. ^[1]; Nakae, L. F. ^[1]; Vogt, R. ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division; Univ. of California, Davis, CA (United States). Dept. of Physics

Publication Date:: Sun Apr 01 00:00:00 EDT 2018

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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

OSTI Identifier:: 1488798

Alternate Identifier(s):: OSTI ID: 1430782

Report Number(s):: LLNL-JRNL-731534
Journal ID: ISSN 2469-9985; PRVCAN; 878683

Grant/Contract Number:: AC52-07NA27344

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 97; Journal Issue: 4; 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


                    Verbeke, J. M., Nakae, L. F., and Vogt, R. Neutron-neutron angular correlations in spontaneous fission of Cf252 and Pu240.  United States: N. p., 2018. 
Web.  doi:10.1103/PhysRevC.97.044601.

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                    Verbeke, J. M., Nakae, L. F., & Vogt, R. Neutron-neutron angular correlations in spontaneous fission of Cf252 and Pu240.  United States.  https://doi.org/10.1103/PhysRevC.97.044601

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                    Verbeke, J. M., Nakae, L. F., and Vogt, R. Sun .  
"Neutron-neutron angular correlations in spontaneous fission of Cf252 and Pu240".  United States.  https://doi.org/10.1103/PhysRevC.97.044601.  https://www.osti.gov/servlets/purl/1488798.

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@article{osti_1488798,

  title        = {Neutron-neutron angular correlations in spontaneous fission of Cf252 and Pu240},

  author       = {Verbeke, J. M. and Nakae, L. F. and Vogt, R.},

  abstractNote = {Background: Angular anisotropy has been observed between prompt neutrons emitted during the fission process. Such an anisotropy arises because the emitted neutrons are boosted along the direction of the parent fragment. Purpose: To measure the neutron-neutron angular correlations from the spontaneous fission of 252Cf and 240Pu oxide samples using a liquid scintillator array capable of pulse-shape discrimination. To compare these correlations to simulations combining the Monte Carlo radiation transport code MCNPX with the fission event generator FREYA. Method: Two different analysis methods were used to study the neutron-neutron correlations with varying energy thresholds. The first is based on setting a light output threshold while the second imposes a time-of-flight cutoff. The second method has the advantage of being truly detector independent. Results: The neutron-neutron correlation modeled by FREYA depends strongly on the sharing of the excitation energy between the two fragments. The measured asymmetry enabled us to adjust the FREYA parameter x in 240Pu , which controls the energy partition between the fragments and is so far inaccessible in other measurements. The 240Pu data in this analysis was the first available to quantify the energy partition for this isotope. The agreement between data and simulation is overall very good for 252Cf ( sf ) and 240Pu ( sf ). Conclusions: The asymmetry in the measured neutron-neutron angular distributions can be predicted by FREYA. The shape of the correlation function depends on how the excitation energy is partitioned between the two fission fragments. Lastly, experimental data suggest that the lighter fragment is disproportionately excited.},

  doi          = {10.1103/PhysRevC.97.044601},

  journal      = {Physical Review C},

  number       = 4,

  volume       = 97,

  place        = {United States},

  year         = {Sun Apr 01 00:00:00 EDT 2018},

  month        = {Sun Apr 01 00:00:00 EDT 2018}

}

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Works referencing / citing this record:

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

Schmidt, Karl-Heinz; Jurado, Beatriz
Reports on Progress in Physics, Vol. 81, Issue 10
DOI: 10.1088/1361-6633/aacfa7

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Title: Neutron-neutron angular correlations in spontaneous fission of Cf 252 and Pu 240

Abstract

Citation Formats

Prompt Neutron Emission Probabilities Following Spontaneous and Thermal Neutron Fission journal, September 1985

Neutron crosstalk between liquid scintillators journal, September 2015

Verification and validation of the MCNPX-PoliMi code for simulations of neutron multiplicity counting systems journal, February 2013

Initial MCNP6 Release Overview journal, December 2012

Angular correlation of neutrons from thermal-neutron fission of 235U journal, October 1978

Fission Reaction Event Yield Algorithm FREYA 2.0.2 journal, January 2018

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

Improved predections of neutron detection efficiency for hydrocarbon scintillators from 1 MeV to about 300 MeV journal, May 1979

Event-by-event study of photon observables in spontaneous and thermal fission journal, April 2013

Total characterization of neutron detectors with a 252Cf source and a new light output determination journal, February 2009

Event-by-event study of neutron observables in spontaneous and thermal fission journal, October 2011

Refined treatment of angular momentum in the event-by-event fission model freya journal, April 2014

Determination of light output function and angle dependent correction for a stilbene crystal scintillation neutron spectrometer journal, January 2002

Calculation of fission observables through event-by-event simulation journal, August 2009

TRIPOLI-4®, CEA, EDF and AREVA reference Monte Carlo code journal, August 2015

Monte Carlo approach to sequential neutron emission from fission fragments journal, August 2005

Neutron-neutron angular correlations in spontaneous fission of 252Cf journal, June 2008

Method for measuring multiple scattering corrections between liquid scintillators journal, July 2016

Event-by-event evaluation of the prompt fission neutron spectrum from 239 Pu ( n , f ) journal, February 2012

MCNP-PoliMi: a Monte-Carlo code for correlation measurements journal, November 2003

Monte Carlo approach to sequential γ-ray emission from fission fragments journal, January 2006

Neutron angular correlations in spontaneous and neutron-induced fission journal, December 2014

Fission Reaction Event Yield Algorithm, FREYA — For event-by-event simulation of fission journal, June 2015

Facility for neutron multiplicity measurements in fission journal, January 2004

Velocity and Angular Distributions of Prompt Neutrons from Spontaneous Fission of Cf 252 journal, June 1962

Event-by-event study of prompt neutrons from Pu 239 ( n , f ) journal, October 2009

Neutron light output response and resolution functions in EJ-309 liquid scintillation detectors journal, July 2013

Angular Correlation of Neutrons from Spontaneous Fission of Cf 252 journal, December 1975

Neutron angular distribution in plutonium-240 spontaneous fission journal, September 2016

Correlated Neutron Emissions from 252 Cf journal, October 2014

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

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

Title: Neutron-neutron angular correlations in spontaneous fission of ${}^{252}{Cf}$ and ${}^{240}{Pu}$

Prompt Neutron Emission Probabilities Following Spontaneous and Thermal Neutron Fission
journal, September 1985

Neutron crosstalk between liquid scintillators
journal, September 2015

Verification and validation of the MCNPX-PoliMi code for simulations of neutron multiplicity counting systems
journal, February 2013

Initial MCNP6 Release Overview
journal, December 2012

Angular correlation of neutrons from thermal-neutron fission of 235U
journal, October 1978

Fission Reaction Event Yield Algorithm FREYA 2.0.2
journal, January 2018

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

Improved predections of neutron detection efficiency for hydrocarbon scintillators from 1 MeV to about 300 MeV
journal, May 1979

Event-by-event study of photon observables in spontaneous and thermal fission
journal, April 2013

Total characterization of neutron detectors with a 252Cf source and a new light output determination
journal, February 2009

Event-by-event study of neutron observables in spontaneous and thermal fission
journal, October 2011

Refined treatment of angular momentum in the event-by-event fission model freya
journal, April 2014

Determination of light output function and angle dependent correction for a stilbene crystal scintillation neutron spectrometer
journal, January 2002

Calculation of fission observables through event-by-event simulation
journal, August 2009

TRIPOLI-4®, CEA, EDF and AREVA reference Monte Carlo code
journal, August 2015

Monte Carlo approach to sequential neutron emission from fission fragments
journal, August 2005

Neutron-neutron angular correlations in spontaneous fission of 252Cf
journal, June 2008

Method for measuring multiple scattering corrections between liquid scintillators
journal, July 2016

Event-by-event evaluation of the prompt fission neutron spectrum from $^{239} Pu (n, f)$
journal, February 2012

MCNP-PoliMi: a Monte-Carlo code for correlation measurements
journal, November 2003

Monte Carlo approach to sequential γ-ray emission from fission fragments
journal, January 2006

Neutron angular correlations in spontaneous and neutron-induced fission
journal, December 2014

Fission Reaction Event Yield Algorithm, FREYA — For event-by-event simulation of fission
journal, June 2015

Facility for neutron multiplicity measurements in fission
journal, January 2004

Velocity and Angular Distributions of Prompt Neutrons from Spontaneous Fission of ${Cf}^{252}$
journal, June 1962

Event-by-event study of prompt neutrons from ${}^{239}{Pu} (n, f)$
journal, October 2009

Neutron light output response and resolution functions in EJ-309 liquid scintillation detectors
journal, July 2013

Angular Correlation of Neutrons from Spontaneous Fission of ${}^{252}{Cf}$
journal, December 1975

Neutron angular distribution in plutonium-240 spontaneous fission
journal, September 2016

Correlated Neutron Emissions from ²⁵² Cf
journal, October 2014

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

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