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Microscopic Description of Fission Process University of Tennessee

Microscopic Description of Fission Process University of Tennessee SSAA grant DE-FG52- 09NA29461 (since 2003). N,Z. elongation necking. N=N 1 +N 2 Z=Z 1 +Z 2. split. N 2 ,Z 2. N 1 ,Z 1. UTK Team. PI: Witold Nazarewicz

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Microscopic Description of Fission Process University of Tennessee

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  1. Microscopic Description of Fission Process University of Tennessee SSAA grant DE-FG52-09NA29461 (since 2003) N,Z elongation necking N=N1+N2 Z=Z1+Z2 split N2,Z2 N1,Z1

  2. UTK Team PI: Witold Nazarewicz PhD students: Jordan McDonnell, Nikola Nikolov (Ph.D. 2011), Erik Olsen, Kemper Talley Postdocs: JochenErler, Junchen Pei Visitors: AndrzejStaszczak, AndrzejBaran, Javid Sheikh, Michal Warda + JacekDobaczewski, Arthur Kerman + Nicolas Schunck (LLNL) + UNEDF + NEUP www.phys.utk.edu/witek/fission/fission.html Funded 2003 Fellow: DOE NNSA SSGF NEUP YaronDanon (RPI) Anil Prinja (UNM) Patrick Talou (LANL) UNEDF

  3. Physics of fission is demanding Input Forces, parameters Many-body dynamics Open channels fission • Fission is a complex process involving the collective motion of all nucleons – One of the most difficult problems in nuclear physics • Most practical applications have been based on simplified theories tuned to existing data

  4. Our Strategy Optimized Functionals Large-scale DFT Collective dynamics Confrontation with experiment; predictions Numerical Techniques

  5. Surface symmetry energy and fission of neutron-rich nuclei fissility parameter

  6. UNEDF1 functional: focus on heavy nuclei and fission • Center-of-mass correction neglected • Data on fission isomers bandheads included • Coulomb exchange tested Fission isomer data:

  7. UNEDF1 functional: focus on heavy nuclei and fission big improvement for fission Comparison with RIPL-3 (IAEA) data:

  8. Fission half-lives WKB: b collective inertia (mass parameter) Several collective coordinates The action has to be minimized multidimensional space of collective parameters a c a b

  9. Cranking approximation: time-odd interaction matrix is neglected NEXT:

  10. J.D. McDonnell et al. A highlight in 2011 SSAA Magazine! POSTER

  11. Deliverables 2010-2012 • 8 papers in peer-reviewed journals • 2 codes • 2 reports • 17 invited and contributed talks at meetings, seminars, posters • 3 workshops organized … more to come, stay tuned!

  12. Two DOE-sponsored workshops on exascale computing for nuclear physics, one common conclusion: The microscopic description of nuclear fission is one of four Priority Research Directions. “Understanding nuclear fission at a more comprehensive level is a critical problem in national security with important implications in nuclear materials detection and nuclear energy, as well as enhancing the quantitative understanding of nuclear weapons” “The ultimate outcome of the nuclear fission project is a treatment of many-body dynamics that will have wide impacts in nuclear physics and beyond. The computational framework developed in the context of fission will be applied to the variety of phenomena associated with the large amplitude collective motion in nuclei and nuclear matter, molecules, nanostructures and solids”

  13. Program announcement: Quantitative Large Amplitude Shape Dynamics: fission and heavy ion fusion Institute for Nuclear Theory, Seattle September 23 – November 15, 2013 Organizers: W. Nazarewicz (witek@utk.edu), A. Andreyev, G. Bertsch, W. Loveland • Main topics: • Reevaluation of basic concepts • Microscopic theory and phenomenological approaches • Nuclear interactions and energy density functionals • Time-dependent many-body dynamics • Key experimental tests • Experimental data needs • Spectroscopic implications • Computational methodologies for dynamics • Quality data for nuclear applications. Keywords: fission, fusion, shape coexistence, self-consistent mean field theory, nuclear density functional theory and its extensions, time dependent methods, adiabatic and diabatic dynamics, synthesis of superheavy elements, fission recycling in the r-process, stockpile stewardship, advanced fuel cycle

  14. SUMMARY • There are fundamental problems in fission that cry to be solved • Basic science (nuclear structure, nuclear astrophysics) • Programmatic needs • Fission is a perfect problem for the extreme scale • Quantum many-body problem is tough! • We are developing a microscopic model that will be predictive • Fission probabilities • Properties of fission fragments • Cross sections • Level densities • Quantification of Margins and Uncertainties is important

  15. Backup

  16. inner outer

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