Super-short fission mode in fermium isotopes

Albertsson, M.; Carlsson, B. G.; Døssing, T.; Möller, P.; Randrup, J.; Åberg, S.

doi:10.1103/PhysRevC.104.064616

Title: Super-short fission mode in fermium isotopes

Abstract

The so-called super-short fission mode, in which a nucleus divides nearly symmetrically into two unusually energetic fragments, competes favorably with the standard asymmetric fission mode for spontaneous fission of a limited number of nuclei near Fm264 but it quickly fades away at finite excitations. We investigate the energy-dependent competition between those two fission modes for even fermium isotopes from Fm254 to Fm268, using the Metropolis method to simulate the strongly damped fission dynamics being driven by shape- and energy-dependent level densities. The origin of the super-short mode is discussed and its effects on the fragment mass distribution, the total fragment kinetic energy, and the neutron multiplicity are calculated. Generally good agreement with the available data is obtained.

Authors:

Albertsson, M.; Carlsson, B. G.; Døssing, T.; Möller, P.; Randrup, J.;

Publication Date:: Mon Dec 27 00:00:00 EST 2021

Research Org.:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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

OSTI Identifier:: 1837475

Alternate Identifier(s):: OSTI ID: 1860231

Grant/Contract Number:: AC02-05CH11231

Resource Type:: Published Article

Journal Name:: Physical Review C

Additional Journal Information:: Journal Name: Physical Review C Journal Volume: 104 Journal Issue: 6; Journal ID: ISSN 2469-9985

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; fission; nuclear structure; nuclear decays

Citation Formats


                    Albertsson, M., Carlsson, B. G., Døssing, T., Möller, P., Randrup, J., and Åberg, S. Super-short fission mode in fermium isotopes.  United States: N. p., 2021. 
Web.  doi:10.1103/PhysRevC.104.064616.

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                    Albertsson, M., Carlsson, B. G., Døssing, T., Möller, P., Randrup, J., & Åberg, S. Super-short fission mode in fermium isotopes.  United States.  https://doi.org/10.1103/PhysRevC.104.064616

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                    Albertsson, M., Carlsson, B. G., Døssing, T., Möller, P., Randrup, J., and Åberg, S. Mon .  
"Super-short fission mode in fermium isotopes".  United States.  https://doi.org/10.1103/PhysRevC.104.064616.

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@article{osti_1837475,

  title        = {Super-short fission mode in fermium isotopes},

  author       = {Albertsson, M. and Carlsson, B. G. and Døssing, T. and Möller, P. and Randrup, J. and Åberg, S.},

  abstractNote = {The so-called super-short fission mode, in which a nucleus divides nearly symmetrically into two unusually energetic fragments, competes favorably with the standard asymmetric fission mode for spontaneous fission of a limited number of nuclei near Fm264 but it quickly fades away at finite excitations. We investigate the energy-dependent competition between those two fission modes for even fermium isotopes from Fm254 to Fm268, using the Metropolis method to simulate the strongly damped fission dynamics being driven by shape- and energy-dependent level densities. The origin of the super-short mode is discussed and its effects on the fragment mass distribution, the total fragment kinetic energy, and the neutron multiplicity are calculated. Generally good agreement with the available data is obtained.},

  doi          = {10.1103/PhysRevC.104.064616},

  journal      = {Physical Review C},

  number       = 6,

  volume       = 104,

  place        = {United States},

  year         = {Mon Dec 27 00:00:00 EST 2021},

  month        = {Mon Dec 27 00:00:00 EST 2021}

}

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Title: Super-short fission mode in fermium isotopes

Abstract

Citation Formats

Analysis of the total kinetic energy of fission fragments with the Langevin equation journal, December 2017

Fragment mass and kinetic-energy distributions from spontaneous fission of the neutron-deficient isotopes, 1.2-s Fm 246 and 38-s Fm 248 . journal, October 1980

Structure properties of Th 226 and Fm 256 , 258 , 260 fission fragments: Mean-field analysis with the Gogny force journal, January 2008

Future of nuclear fission theory journal, October 2020

Calculated fission-fragment mass yields and average total kinetic energies of heavy and superheavy nuclei journal, February 2020

Angular momentum generation in nuclear fission journal, February 2021

Distribution of mass, kinetic energy, and neutron yield in the spontaneous fission of Fm 254 journal, October 1977

12.3-min Cf 256 and 43-min Md 258 and systematics of the spontaneous fission properties of heavy nuclides journal, March 1980

Calculated fission-fragment yield systematics in the region 74 ≤ Z ≤ 94 and 90 ≤ N ≤ 150 journal, April 2015

Bimodal symmetric fission observed in the heaviest elements journal, January 1986

Heavy-element fission barriers journal, June 2009

Fission modes of Fm 256 and Fm 258 in a microscopic approach journal, July 2006

Brownian Shape Motion on Five-Dimensional Potential-Energy Surfaces:Nuclear Fission-Fragment Mass Distributions journal, March 2011

Systematics of fission fragment total kinetic energy release journal, April 1985

Stability of heavy and superheavy elements journal, November 1994

Neutron multiplicity at spontaneous fission of 246Fm journal, May 2010

Symmetric Fission Observed in Thermal-Neutron-Induced and Spontaneous Fission of Fm 257 journal, July 1971

Further studies in the liquid-drop theory on nuclear fission journal, June 1969

Nuclear pairing models journal, January 1992

Nuclear scission journal, December 1990

Spontaneous fission properties of Fm 258 , Md 259 , Md 260 , No 258 , and ] 260 : Bimodal fission journal, August 1989

Multidimensionally-constrained relativistic mean-field study of spontaneous fission: Coupling between shape and pairing degrees of freedom journal, April 2016

Two fission modes of the heavy fermium isotopes journal, January 1989

Calculated fission properties of the heaviest elements journal, July 1987

Mass Symmetry in the Spontaneous Fission of Fm 257 journal, January 1971

Symmetric fission in the neutron-induced fission of Fm 255 journal, January 1974

Nuclear shape evolution based on microscopic level densities journal, February 2017

The emission of prompt neutrons from the spontaneous fission of 252No and 244Fm journal, September 2012

New developments in the calculation of heavy-element fission barriers journal, February 1989

Correlated transitions in TKE and mass distributions of fission fragments described by 4-D Langevin equation journal, February 2019

Origin of the dramatic change of fission mode in fermium isotopes investigated using Langevin equations journal, May 2019

One-body dissipation and the super-viscidity of nuclei journal, August 1978

Prompt neutron emission from the spontaneous fission of Md 260 journal, February 1990

Fission of Es 2 5 5 , 2 5 6 , Fm 2 5 5 − 2 5 7 , and Md 258 at moderate excitation energies journal, August 1984

Spontaneous fission of neutron-deficient fermium isotopes and the new nucleus 241Fm journal, July 2008

Neutron multiplicity measurements of Cf and Fm isotopes journal, February 1980

From asymmetric to symmetric fission in the fermium isotopes within the time-dependent generator-coordinate-method formalism journal, February 2019

Dynamical Calculation of Multi-Modal Nuclear Fission of Fermium Nuclei journal, January 2004

Energy dependence of fission-fragment mass distributions from strongly damped shape evolution journal, December 2013

Origin of the narrow, single peak in the fission-fragment mass distribution for Fm 258 journal, January 2009

Mass distributions for thermal-neutron-induced fission of Fm 255 and Cf 251 journal, May 1975

Excitation energy partition in fission journal, April 2020

Unusually low fragment energies in the symmetric fission of Md 259 journal, October 1982

Distribution of Mass in the Spontaneous Fission of Fm 256 journal, May 1972

Microscopic description of complex nuclear decay: Multimodal fission journal, July 2009

Spontaneous fission of Fm 259 journal, March 1980

Systematic measurements of prompt fission γ rays – and what they tell us about fission fragment de-excitation journal, January 2019

Investigating neutron multiplicity during the spontaneous fission of short-lived isotopes (Z ≥ 100) using the VASSILISSA recoil separator journal, April 2015

Correlation studies of fission-fragment neutron multiplicities journal, January 2021

Self-consistent calculations of fission barriers in the Fm region journal, July 2002

Analysis of the total kinetic energy of fission fragments with the Langevin equation
journal, December 2017

Fragment mass and kinetic-energy distributions from spontaneous fission of the neutron-deficient isotopes, 1.2-s ${}^{246}{Fm}$ and 38-s ${}^{248}{Fm}$ .
journal, October 1980

Structure properties of ${}^{226}{Th}$ and ${}^{256, 258, 260}{Fm}$ fission fragments: Mean-field analysis with the Gogny force
journal, January 2008

Future of nuclear fission theory
journal, October 2020

Calculated fission-fragment mass yields and average total kinetic energies of heavy and superheavy nuclei
journal, February 2020

Angular momentum generation in nuclear fission
journal, February 2021

Distribution of mass, kinetic energy, and neutron yield in the spontaneous fission of ${}^{254}{Fm}$
journal, October 1977

12.3-min ${}^{256}{Cf}$ and 43-min ${}^{258}{Md}$ and systematics of the spontaneous fission properties of heavy nuclides
journal, March 1980

Calculated fission-fragment yield systematics in the region $74 \leq Z \leq 94$ and $90 \leq N \leq 150$
journal, April 2015

Bimodal symmetric fission observed in the heaviest elements
journal, January 1986

Heavy-element fission barriers
journal, June 2009

Fission modes of ${}^{256}{Fm}$ and ${}^{258}{Fm}$ in a microscopic approach
journal, July 2006

Brownian Shape Motion on Five-Dimensional Potential-Energy Surfaces:Nuclear Fission-Fragment Mass Distributions
journal, March 2011

Systematics of fission fragment total kinetic energy release
journal, April 1985

Stability of heavy and superheavy elements
journal, November 1994

Neutron multiplicity at spontaneous fission of 246Fm
journal, May 2010

Symmetric Fission Observed in Thermal-Neutron-Induced and Spontaneous Fission of ${}^{257}{Fm}$
journal, July 1971

Further studies in the liquid-drop theory on nuclear fission
journal, June 1969

Nuclear pairing models
journal, January 1992

Nuclear scission
journal, December 1990

Spontaneous fission properties of ${}^{258}{Fm}$ , ${}^{259}{Md}$ , ${}^{260}{Md}$ , ${}^{258}{No}$ , and ${}^{260}]$ : Bimodal fission
journal, August 1989

Multidimensionally-constrained relativistic mean-field study of spontaneous fission: Coupling between shape and pairing degrees of freedom
journal, April 2016

Two fission modes of the heavy fermium isotopes
journal, January 1989

Calculated fission properties of the heaviest elements
journal, July 1987

Mass Symmetry in the Spontaneous Fission of ${}^{257}{Fm}$
journal, January 1971

Symmetric fission in the neutron-induced fission of ${}^{255}{Fm}$
journal, January 1974

Nuclear shape evolution based on microscopic level densities
journal, February 2017

The emission of prompt neutrons from the spontaneous fission of 252No and 244Fm
journal, September 2012

New developments in the calculation of heavy-element fission barriers
journal, February 1989

Correlated transitions in TKE and mass distributions of fission fragments described by 4-D Langevin equation
journal, February 2019

Origin of the dramatic change of fission mode in fermium isotopes investigated using Langevin equations
journal, May 2019

One-body dissipation and the super-viscidity of nuclei
journal, August 1978

Prompt neutron emission from the spontaneous fission of ${}^{260}{Md}$
journal, February 1990

Fission of ${}^{255, 256}{Es}$ , ${}^{255 - 257}{Fm}$ , and ${}^{258}{Md}$ at moderate excitation energies
journal, August 1984

Spontaneous fission of neutron-deficient fermium isotopes and the new nucleus 241Fm
journal, July 2008

Neutron multiplicity measurements of Cf and Fm isotopes
journal, February 1980

From asymmetric to symmetric fission in the fermium isotopes within the time-dependent generator-coordinate-method formalism
journal, February 2019

Dynamical Calculation of Multi-Modal Nuclear Fission of Fermium Nuclei
journal, January 2004

Energy dependence of fission-fragment mass distributions from strongly damped shape evolution
journal, December 2013

Origin of the narrow, single peak in the fission-fragment mass distribution for ${}^{258}{Fm}$
journal, January 2009

Mass distributions for thermal-neutron-induced fission of ${}^{255}{Fm}$ and ${}^{251}{Cf}$
journal, May 1975

Excitation energy partition in fission
journal, April 2020

Unusually low fragment energies in the symmetric fission of ${}^{259}{Md}$
journal, October 1982

Distribution of Mass in the Spontaneous Fission of ${}^{256}{Fm}$
journal, May 1972

Microscopic description of complex nuclear decay: Multimodal fission
journal, July 2009

Spontaneous fission of ${}^{259}{Fm}$
journal, March 1980

Systematic measurements of prompt fission γ rays – and what they tell us about fission fragment de-excitation
journal, January 2019

Investigating neutron multiplicity during the spontaneous fission of short-lived isotopes (Z ≥ 100) using the VASSILISSA recoil separator
journal, April 2015

Correlation studies of fission-fragment neutron multiplicities
journal, January 2021

Self-consistent calculations of fission barriers in the Fm region
journal, July 2002