Microscopic evidence for scission neutrons

Abdurrahman, Ibrahim; Kafker, Matthew; Bulgac, Aurel; Stetcu, Ionel

doi:10.1051/epjconf/202429208008

Microscopic evidence for scission neutrons

Journal Article · Thu Mar 14 00:00:00 EDT 2024 · EPJ Web of Conferences (Online)

DOI:https://doi.org/10.1051/epjconf/202429208008· OSTI ID:2426812

^[1]; Kafker, Matthew ^[2]; Bulgac, Aurel ^[2]; ^[1]

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Univ. of Washington, Seattle, WA (United States)

We discuss the neck rupture stage of fission and the emission of particles afterwards, two extremely rapid and highly non-equilibrium processes. Currently, the neck rupture cannot be directly probed by experiment, highlighting the importance of reliable theoretical predictions for this stage of fission. Time-dependent density functional theory (TDDFT) is used to simulate the spontaneous fission of ²⁵²Cf. In conjunction with statistical models, inputs from microscopic calculations can be used to make predictions for prompt neutron and gamma emission spectra, quantities which can be experimentally measured. Here we characterize the scission mechanism within TDDFT and estimate the number of scission neutrons and their kinetic energies.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001; AC05-00OR22725; FG02-97ER41014; NA0003841

OSTI ID:: 2426812

Report Number(s):: LA-UR--23-31053

Journal Information:: EPJ Web of Conferences (Online), Journal Name: EPJ Web of Conferences (Online) Vol. 292; ISSN 2100-014X

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

References (37)

The scission neutron spectrum of252CF (SF) Brosa, U.; Knitter, H. -H. Zeitschrift f�r Physik A Hadrons and Nuclei, Vol. 343, Issue 1 https://doi.org/10.1007/BF01291595	journal	March 1992
�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
Catapult mechanism for fast particle emission in fission and heavy ion reactions M�dler, P. Zeitschrift f�r Physik A Atoms and Nuclei, Vol. 321, Issue 2 https://doi.org/10.1007/BF01493456	journal	June 1985
Energy and angular distributions of prompt neutrons from slow neutron fission of U235 Skarsvåg, K.; Bergheim, K. Nuclear Physics, Vol. 45 https://doi.org/10.1016/0029-5582(63)90785-5	journal	July 1963
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
Angular correlation of neutrons from thermal-neutron fission of 235U Franklyn, C. B.; Hofmeyer, C.; Mingay, D. W. Physics Letters B, Vol. 78, Issue 5 https://doi.org/10.1016/0370-2693(78)90640-8	journal	October 1978
Simultaneous investigation of fission fragments and neutrons in 252Cf (SF) Budtz-Jørgensen, C.; Knitter, H. -H. Nuclear Physics A, Vol. 490, Issue 2 https://doi.org/10.1016/0375-9474(88)90508-8	journal	December 1988
Finite difference approach for the two-dimensional Schrödinger equation with application to scission-neutron emission Rizea, M.; Ledoux, V.; Van Daele, M. Computer Physics Communications, Vol. 179, Issue 7 https://doi.org/10.1016/j.cpc.2008.04.009	journal	October 2008
The LISE package: Solvers for static and time-dependent superfluid local density approximation equations in three dimensions Jin, Shi; Roche, Kenneth J.; Stetcu, Ionel Computer Physics Communications, Vol. 269 https://doi.org/10.1016/j.cpc.2021.108130	journal	December 2021
Emission of scission neutrons in the sudden approximation Carjan, N.; Talou, P.; Serot, O. Nuclear Physics A, Vol. 792, Issue 1-2 https://doi.org/10.1016/j.nuclphysa.2007.05.006	journal	August 2007
New Features of the FIFRELIN Code for the Investigation of Fission Fragments Characteristics Litaize, Olivier; Serot, Olivier; Regnier, David Physics Procedia, Vol. 31 https://doi.org/10.1016/j.phpro.2012.04.008	journal	January 2012
Similarities between calculated scission-neutron properties and experimental data on prompt fission neutrons Carjan, N.; Rizea, M. Physics Letters B, Vol. 747 https://doi.org/10.1016/j.physletb.2015.05.050	journal	July 2015
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
Investigation of the prompt neutron emission mechanism in low energy fission of ^235,233 U(n _th , f) and ²⁵² Cf(sf) Vorobyev, A. S.; Shcherbakov, O. A.; Gagarski, A. M. EPJ Web of Conferences, Vol. 8 https://doi.org/10.1051/epjconf/20100803004	journal	January 2010
Neutron-fragment angular correlations in²³⁵U(nth_th,f) Franklyn, C. B. Radiation Effects, Vol. 92, Issue 1-4 https://doi.org/10.1080/00337578608208343	journal	March 1986
Velocity and Angular Distributions of Prompt Neutrons from Spontaneous Fission of Cf 252 Bowman, Harry R.; Thompson, Stanley G.; Milton, J. C. D. Physical Review, Vol. 126, Issue 6 https://doi.org/10.1103/PhysRev.126.2120	journal	June 1962
Dependence of Neutron Production in Fission on Rate of Change of Nuclear Potential Fuller, Robert W. Physical Review, Vol. 126, Issue 2 https://doi.org/10.1103/PhysRev.126.684	journal	April 1962
Emission of Prompt Neutrons in the Thermal Neutron Fission of U 235 Kapoor, S. S.; Ramanna, R.; Rao, P. N. Rama Physical Review, Vol. 131, Issue 1 https://doi.org/10.1103/PhysRev.131.283	journal	July 1963
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
Directional Properties of Fission Neutrons Wilson, Robert R. Physical Review, Vol. 72, Issue 3 https://doi.org/10.1103/PhysRev.72.189	journal	August 1947
Angular Dependence of Coincidences between Fission Neutrons Debenedetti, S.; Francis, J. E.; Preston, W. M. Physical Review, Vol. 74, Issue 11 https://doi.org/10.1103/PhysRev.74.1645	journal	December 1948
Dynamic single-particle effects in fission Boneh, Y.; Fraenkel, Z. Physical Review C, Vol. 10, Issue 2 https://doi.org/10.1103/PhysRevC.10.893	journal	August 1974
Fission dynamics of Pu 240 from saddle to scission and beyond Bulgac, Aurel; Jin, Shi; Roche, Kenneth J. Physical Review C, Vol. 100, Issue 3 https://doi.org/10.1103/PhysRevC.100.034615	journal	September 2019
Scission-point model of nuclear fission based on deformed-shell effects Wilkins, B. D.; Steinberg, E. P.; Chasman, R. R. Physical Review C, Vol. 14, Issue 5 https://doi.org/10.1103/PhysRevC.14.1832	journal	November 1976
Model for particle emission from a fissioning system Milek, B.; Reif, R.; Révai, J. Physical Review C, Vol. 37, Issue 3 https://doi.org/10.1103/PhysRevC.37.1077	journal	March 1988
Prescission neutron emission inU235(nth,f) through fragment-neutron angular correlation studies Samant, M. S.; Anand, R. P.; Choudhury, R. K. Physical Review C, Vol. 51, Issue 6 https://doi.org/10.1103/PhysRevC.51.3127	journal	June 1995
Search for scission neutrons in the spontaneous fission of 252 Cf Hwang, J. K.; Ramayya, A. V.; Hamilton, J. H. Physical Review C, Vol. 60, Issue 4 https://doi.org/10.1103/PhysRevC.60.044616	journal	September 1999
Event-by-event study of prompt neutrons from Pu 239 ( n , f ) Vogt, R.; Randrup, J.; Pruet, J. Physical Review C, Vol. 80, Issue 4 https://doi.org/10.1103/PhysRevC.80.044611	journal	October 2009
Scission neutrons and other scission properties as function of mass asymmetry in U 235 ( n th , f ) Carjan, N.; Rizea, M. Physical Review C, Vol. 82, Issue 1 https://doi.org/10.1103/PhysRevC.82.014617	journal	July 2010
Monte Carlo Hauser-Feshbach predictions of prompt fission γ rays: Application to n th + 235 U, n th + 239 Pu, and 252 Cf (sf) Becker, B.; Talou, P.; Kawano, T. Physical Review C, Vol. 87, Issue 1 https://doi.org/10.1103/PhysRevC.87.014617	journal	January 2013
Neutron correlations in spontaneous fission ofCf252 Gavron, A.; Fraenkel, Z. Physical Review C, Vol. 9, Issue 2 https://doi.org/10.1103/PhysRevC.9.632	journal	February 1974
Scission neutrons for U, Pu, Cm, and Cf isotopes: Relative multiplicities calculated in the sudden limit Capote, R.; Carjan, N.; Chiba, S. Physical Review C, Vol. 93, Issue 2 https://doi.org/10.1103/PhysRevC.93.024609	journal	February 2016
Minimal nuclear energy density functional Bulgac, Aurel; Forbes, Michael McNeil; Jin, Shi Physical Review C, Vol. 97, Issue 4 https://doi.org/10.1103/PhysRevC.97.044313	journal	April 2018
Structures in the energy distribution of the scission neutrons: Finite neutron-number effect Carjan, N.; Rizea, M. Physical Review C, Vol. 99, Issue 3 https://doi.org/10.1103/PhysRevC.99.034613	journal	March 2019
Angular Correlation of Neutrons from Spontaneous Fission of Cf 252 Pringle, J. S.; Brooks, F. D. Physical Review Letters, Vol. 35, Issue 23 https://doi.org/10.1103/PhysRevLett.35.1563	journal	December 1975
Estimation of the Yield of “Scission” Neutrons from Thermal Neutron-Induced Fission of 239Pu Vorobyev, A. S.; Shcherbakov, O. A.; Gagarski, A. M. Journal of Experimental and Theoretical Physics, Vol. 127, Issue 4 https://doi.org/10.1134/S1063776118090224	journal	October 2018
Detailed Investigations of Neutron–Neutron Angular Correlations in Slow-Neutron-Induced Fission of 233U, 235U, and 239Pu Guseva, I. S.; Gagarski, A. M.; Sokolov, V. E. Physics of Atomic Nuclei, Vol. 81, Issue 4 https://doi.org/10.1134/S1063778818040051	journal	July 2018

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