Event-by-event study of prompt neutrons fromPu239(n,f)

Vogt, R.; Randrup, J.; Pruet, J.; Younes, W.

doi:10.1103/physrevc.80.044611

Title: Event-by-event study of prompt neutrons from Pu 239 ( n , f )

Journal Article · 19 October 2009 · Physical Review. C. Nuclear Physics

DOI: https://doi.org/10.1103/physrevc.80.044611 · OSTI ID:966914

Vogt, R. ^[1]; Randrup, J. ^[2]; Pruet, J. ^[3]; Younes, W. ^[3]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of California, Davis, CA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Employing a recently developed Monte-Carlo model, we study the fission of ²⁴⁰Pu induced by neutrons with energies from thermal to just below the threshold for second chance fission. Current measurements of the mean number of prompt neutrons emitted in fission, together with less accurate measurements of the neutron energy spectra, place remarkably fine constraints on predictions of microscopic calculations. In particular, the total excitation energy of the nascent fragments must be specified to within 1MeV to avoid disagreement with measurements of the mean neutron multiplicity. Here, the combination of the Monte-Carlo fission model with a statistical likelihood analysis also presents a powerful tool for the evaluation of fission neutron data. Of particular importance is the fission spectrum, which plays a key role in determining reactor criticality. We show that our approach can be used to develop an estimate of the fission spectrum with uncertainties several times smaller than current experimental uncertainties for outgoing neutron energies of less than 2 MeV.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)

Grant/Contract Number:: AC02-05CH11231; AC52-07NA27344; W-7405-ENG-48

OSTI ID:: 966914

Report Number(s):: LLNL--JRNL-415141

Journal Information:: Physical Review. C. Nuclear Physics, Journal Name: Physical Review. C. Nuclear Physics Journal Issue: 4 Vol. 80; ISSN 0556-2813

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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�ber den Nachweis und das Verhalten der bei der Bestrahlung des Urans mittels Neutronen entstehenden Erdalkalimetalle Hahn, O.; Strassmann, F. Die Naturwissenschaften, Vol. 27, Issue 1 https://doi.org/10.1007/bf01488241	journal	January 1939
Prompt v in neutron-induced fission of 239Pu and 241Pu Condé, H.; Hansén, J.; Holmberg, M. Journal of Nuclear Energy, Vol. 22, Issue 1 https://doi.org/10.1016/0022-3107(68)90064-6	journal	January 1968
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Prompt neutrons from fission Hopkins, J. C.; Diven, B. C. Nuclear Physics, Vol. 48 https://doi.org/10.1016/0029-5582(63)90182-2	journal	October 1963
Neutron emission from U233, U235 and Pu239 fission fragments Apalin, V. F.; Gritsyuk, Yu. N.; Kutikov, I. E. Nuclear Physics, Vol. 71, Issue 3 https://doi.org/10.1016/0029-5582(65)90765-0	journal	September 1965
Nuclear scission Brosa, Ulrich; Grossmann, Siegfried; Müller, Andreas Physics Reports, Vol. 197, Issue 4 https://doi.org/10.1016/0370-1573(90)90114-h	journal	December 1990
Fission fragment K x-ray emission and nuclear charge distribution for thermal neutron fission of 233U, 235U, 239Pu and spontaneous fission of 252Cf Reisdorf, W.; Unik, J. P.; Griffin, H. C. Nuclear Physics A, Vol. 177, Issue 2 https://doi.org/10.1016/0375-9474(71)90297-1	journal	December 1971
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Distribution of Prompt Neutron Emission Probability for Fission Fragments in Spontaneous Fission of 252Cf and 244,248Cm Vorobyev, A. S. AIP Conference Proceedings https://doi.org/10.1063/1.1945084	conference	January 2005
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Measurement of Fragment Mass Dependent Kinetic Energy and Neutron Multiplicity for Thermal Neutron Induced Fission of Plutonium-239 Nishio, Katsuhisa; Nakagome, Yoshihiro; Kanno, Ikuo Journal of Nuclear Science and Technology, Vol. 32, Issue 5 https://doi.org/10.1080/18811248.1995.9731725	journal	May 1995
Simultaneous Measurement of Prompt Neutrons and Fission Fragments for ²³⁹ Pu( n _th ,f ) Tsuchiya, Chikafumi; Nakagome, Yoshihiro; Yamana, Hajimu Journal of Nuclear Science and Technology, Vol. 37, Issue 11 https://doi.org/10.1080/18811248.2000.9714976	journal	November 2000
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Comparison of the energy and mass characteristics of the Pu 239 ( n th , f ) and the Pu 240 (sf) fragments Wagemans, C.; Allaert, E.; Deruytter, A. Physical Review C, Vol. 30, Issue 1 https://doi.org/10.1103/physrevc.30.218	journal	July 1984
Sawtooth curve of neutron multiplicity Brosa, U. Physical Review C, Vol. 32, Issue 4 https://doi.org/10.1103/physrevc.32.1438	journal	October 1985
Microscopic approach of fission dynamics applied to fragment kinetic energy and mass distributions in U 238 Goutte, H.; Berger, J. F.; Casoli, P. Physical Review C, Vol. 71, Issue 2 https://doi.org/10.1103/physrevc.71.024316	journal	February 2005
Monte Carlo approach to sequential neutron emission from fission fragments Lemaire, S.; Talou, P.; Kawano, T. Physical Review C, Vol. 72, Issue 2 https://doi.org/10.1103/physrevc.72.024601	journal	August 2005
Structure properties of Th 226 and Fm 256 , 258 , 260 fission fragments: Mean-field analysis with the Gogny force Dubray, N.; Goutte, H.; Delaroche, J. -P. Physical Review C, Vol. 77, Issue 1 https://doi.org/10.1103/physrevc.77.014310	journal	January 2008
Heavy-element fission barriers Möller, Peter; Sierk, Arnold J.; Ichikawa, Takatoshi Physical Review C, Vol. 79, Issue 6 https://doi.org/10.1103/physrevc.79.064304	journal	June 2009
Calculation of fission observables through event-by-event simulation Randrup, Jørgen; Vogt, Ramona Physical Review C, Vol. 80, Issue 2 https://doi.org/10.1103/physrevc.80.024601	journal	August 2009
Evaluation of _p for ²³⁹ Pu: Impact for Applications of the Fluctuations at Low Energy Fort, E.; Fréhaut, J.; Tellier, H. Nuclear Science and Engineering, Vol. 99, Issue 4 https://doi.org/10.13182/nse88-a23566	journal	August 1988
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Dependence of $$\bar v$$ on neutron energies up to 5 MeV for233U,238U, and239Pu Nurpeisov, B.; Volodin, K. E.; Nesterov, V. G. Soviet Atomic Energy, Vol. 39, Issue 3 https://doi.org/10.1007/BF01122383	journal	September 1975
Secondary neutron spectra in235U and239Pu fission by 0.1 MeV neutrons Aleksandrova, Z. A.; Bol'shov, V. I.; Kuznetsov, V. F. Soviet Atomic Energy, Vol. 38, Issue 2 https://doi.org/10.1007/BF01208877	journal	February 1975
�ber den Nachweis und das Verhalten der bei der Bestrahlung des Urans mittels Neutronen entstehenden Erdalkalimetalle Hahn, O.; Strassmann, F. Die Naturwissenschaften, Vol. 27, Issue 1 https://doi.org/10.1007/BF01488241	journal	January 1939
Prompt v in neutron-induced fission of 239Pu and 241Pu Condé, H.; Hansén, J.; Holmberg, M. Journal of Nuclear Energy, Vol. 22, Issue 1 https://doi.org/10.1016/0022-3107(68)90064-6	journal	January 1968
The energy dependence of for 233U, 235U and 239Pu below 5·0 MeV Walsh, R. L.; Boldeman, J. W. Journal of Nuclear Energy, Vol. 25, Issue 8 https://doi.org/10.1016/0022-3107(71)90064-5	journal	August 1971
Prompt neutrons from fission Hopkins, J. C.; Diven, B. C. Nuclear Physics, Vol. 48 https://doi.org/10.1016/0029-5582(63)90182-2	journal	October 1963
Neutron emission from U233, U235 and Pu239 fission fragments Apalin, V. F.; Gritsyuk, Yu. N.; Kutikov, I. E. Nuclear Physics, Vol. 71, Issue 3 https://doi.org/10.1016/0029-5582(65)90765-0	journal	September 1965
Nuclear scission Brosa, Ulrich; Grossmann, Siegfried; Müller, Andreas Physics Reports, Vol. 197, Issue 4 https://doi.org/10.1016/0370-1573(90)90114-H	journal	December 1990
Fission fragment K x-ray emission and nuclear charge distribution for thermal neutron fission of 233U, 235U, 239Pu and spontaneous fission of 252Cf Reisdorf, W.; Unik, J. P.; Griffin, H. C. Nuclear Physics A, Vol. 177, Issue 2 https://doi.org/10.1016/0375-9474(71)90297-1	journal	December 1971
Microscopic analysis of collective dynamics in low energy fission Berger, J. F.; Girod, M.; Gogny, D. Nuclear Physics A, Vol. 428 https://doi.org/10.1016/0375-9474(84)90240-9	journal	October 1984
Fission mode fluctuations in the resonances of 235U(n,f) Hambsch, F. J.; Knitter, H. H.; Budtz-Jørgensen, C. Nuclear Physics A, Vol. 491, Issue 1 https://doi.org/10.1016/0375-9474(89)90206-6	journal	January 1989
Fluctuations in nuclear dynamics From transport theory to dynamical simulation Burgio, G. F.; Chomaz, Ph.; Randrup, J. Nuclear Physics A, Vol. 529, Issue 1 https://doi.org/10.1016/0375-9474(91)90790-D	journal	July 1991
Prompt fission neutron energy spectra induced by fast neutrons Staples, P.; Egan, J. J.; Kegel, G. H. R. Nuclear Physics A, Vol. 591, Issue 1 https://doi.org/10.1016/0375-9474(95)00119-L	journal	August 1995
The 1995 update to the atomic mass evaluation Audi, G.; Wapstra, A. H. Nuclear Physics A, Vol. 595, Issue 4 https://doi.org/10.1016/0375-9474(95)00445-9	journal	December 1995
Nuclear mass formula with shell energies calculated by a new method Koura, Hiroyuki; Uno, Masahiro; Tachibana, Takahiro Nuclear Physics A, Vol. 674, Issue 1-2 https://doi.org/10.1016/S0375-9474(00)00155-X	journal	July 2000
Multiplicity and energy of neutrons from 235U(nth,f) fission fragments Nishio, K.; Nakagome, Y.; Yamamoto, H. Nuclear Physics A, Vol. 632, Issue 4 https://doi.org/10.1016/S0375-9474(98)00008-6	journal	March 1998
Investigation of the fission fragment properties of the reaction 238U(n,f) at incident neutron energies up to 5.8 MeV Vivès, F.; Hambsch, F. -J.; Bax, H. Nuclear Physics A, Vol. 662, Issue 1-2 https://doi.org/10.1016/S0375-9474(99)00413-3	journal	January 2000
ENDF/B-VII.0: Next Generation Evaluated Nuclear Data Library for Nuclear Science and Technology Chadwick, M. B.; Obložinský, P.; Herman, M. Nuclear Data Sheets, Vol. 107, Issue 12 https://doi.org/10.1016/j.nds.2006.11.001	journal	December 2006
Disintegration of Uranium by Neutrons: a New Type of Nuclear Reaction Meitner, Lise; Frisch, O. R. Nature, Vol. 143, Issue 3615 https://doi.org/10.1038/143239a0	journal	February 1939
Nuclear fission modes and fragment mass asymmetries in a five-dimensional deformation space Möller, P.; Madland, D. G.; Sierk, A. J. Nature, Vol. 409, Issue 6822 https://doi.org/10.1038/35057204	journal	February 2001
Distribution of Prompt Neutron Emission Probability for Fission Fragments in Spontaneous Fission of 252Cf and 244,248Cm Vorobyev, A. S. AIP Conference Proceedings https://doi.org/10.1063/1.1945084	conference	January 2005
Nuclear Fission Vandenbosch, R.; Huizenga, J. R.; Nix, J. R. Physics Today, Vol. 27, Issue 8 https://doi.org/10.1063/1.3128816	journal	August 1974
Statistics and Nuclear Reactions Weisskopf, V. Physical Review, Vol. 52, Issue 4 https://doi.org/10.1103/PhysRev.52.295	journal	August 1937
The Mechanism of Nuclear Fission Bohr, Niels; Wheeler, John Archibald Physical Review, Vol. 56, Issue 5 https://doi.org/10.1103/PhysRev.56.426	journal	September 1939
Comparison of the energy and mass characteristics of the Pu 239 ( n th , f ) and the Pu 240 (sf) fragments Wagemans, C.; Allaert, E.; Deruytter, A. Physical Review C, Vol. 30, Issue 1 https://doi.org/10.1103/PhysRevC.30.218	journal	July 1984
Sawtooth curve of neutron multiplicity Brosa, U. Physical Review C, Vol. 32, Issue 4 https://doi.org/10.1103/PhysRevC.32.1438	journal	October 1985
Microscopic approach of fission dynamics applied to fragment kinetic energy and mass distributions in U 238 Goutte, H.; Berger, J. F.; Casoli, P. Physical Review C, Vol. 71, Issue 2 https://doi.org/10.1103/PhysRevC.71.024316	journal	February 2005
Monte Carlo approach to sequential neutron emission from fission fragments Lemaire, S.; Talou, P.; Kawano, T. Physical Review C, Vol. 72, Issue 2 https://doi.org/10.1103/PhysRevC.72.024601	journal	August 2005
Structure properties of Th 226 and Fm 256 , 258 , 260 fission fragments: Mean-field analysis with the Gogny force Dubray, N.; Goutte, H.; Delaroche, J. -P. Physical Review C, Vol. 77, Issue 1 https://doi.org/10.1103/PhysRevC.77.014310	journal	January 2008
Heavy-element fission barriers Möller, Peter; Sierk, Arnold J.; Ichikawa, Takatoshi Physical Review C, Vol. 79, Issue 6 https://doi.org/10.1103/PhysRevC.79.064304	journal	June 2009
Calculation of fission observables through event-by-event simulation Randrup, Jørgen; Vogt, Ramona Physical Review C, Vol. 80, Issue 2 https://doi.org/10.1103/PhysRevC.80.024601	journal	August 2009
Evaluation of _p for ²³⁹ Pu: Impact for Applications of the Fluctuations at Low Energy Fort, E.; Fréhaut, J.; Tellier, H. Nuclear Science and Engineering, Vol. 99, Issue 4 https://doi.org/10.13182/NSE88-A23566	journal	August 1988
Measurement of Fragment Mass Dependent Kinetic Energy and Neutron Multiplicity for Thermal Neutron Induced Fission of Plutonium-239. Nishio, Katsuhisa; Nakagome, Yoshihiro; Kanno, Ikuo Journal of Nuclear Science and Technology, Vol. 32, Issue 5 https://doi.org/10.3327/jnst.32.404	journal	January 1995
Simultaneous Measurement of Prompt Neutrons and Fission Fragments for 239Pu(nth, f). Tsuchiya, Chikafumi; Nakagome, Yoshihiro; Yamana, Hajimu Journal of Nuclear Science and Technology, Vol. 37, Issue 11 https://doi.org/10.3327/jnst.37.941	journal	January 2000

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