Statistical Theory of Nuclear Reactions UNEDF SciDAC Annual Meeting MSU, June 21-24, 2010 Goran Arbanas (ORNL) Kenny Roche (PNNL) Arthur Kerman (MIT/UT)

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Presentation transcript:

Statistical Theory of Nuclear Reactions UNEDF SciDAC Annual Meeting MSU, June 21-24, 2010 Goran Arbanas (ORNL) Kenny Roche (PNNL) Arthur Kerman (MIT/UT) Carlos Bertulani (TAMU) David Dean (ORNL)

2Managed by UT-Battelle for the U.S. Department of Energy Presentation_name HPC numerical simulation of formal theories of statistical nuclear reactions

3Managed by UT-Battelle for the U.S. Department of Energy Presentation_name Year 5 Progress Report Year 5 Reaction Deliverable #55: – “Examine energy-dependence of eigensolutions in the expansion for the KKM theory.” Year 5 Progress Report: – Prototyped energy dependence in KKM: Intel MKL implementation of complex symmetric eigensolver on 12 cores – Massively parallel code in “ensemble” eigensolver of complex symmetric matrices (K. Roche). In the meantime: loop through energies on the parallel code. Related HPC contribution: – Massively Parallel eigensolver for large (ensembles) of complex symmetric matrices

4Managed by UT-Battelle for the U.S. Department of Energy Presentation_name Why KKM? A framework based on Feshbach’s projection operators Central result: – T = T background + T resonant = T average + T fluctuating A foundation for derived statistical theories: – Kerman-McVoy Designed for two step processes like A(d,p)B*, B*  A+n Could be used for statistical (d,p) reactions at FRIB – Feshbach-Kerman-Koonin (FKK) Multistep reactions, used for nuclear data analysis Similar expressions were derived later by other methods

5Managed by UT-Battelle for the U.S. Department of Energy Presentation_name Physical picture E … Q d q P continuum bound PHQ dHq Pdq Q compound doorway

6Managed by UT-Battelle for the U.S. Department of Energy Presentation_name Feshbach’s projection operators Two-potential formula yields

7Managed by UT-Battelle for the U.S. Department of Energy Presentation_name KKM subtraction Use H opt to rewrite Eq. (3) Kawai, Kerman, and McVoy Ann. of Phys. 75, 156 (1973) Energy averaging of the T-matrix yields this expression for optical potential and opt.wave-f. (for Lorentzian averaging)

8Managed by UT-Battelle for the U.S. Department of Energy Presentation_name KKM Fluctuation T-matrix Two-potential formula yields

9Managed by UT-Battelle for the U.S. Department of Energy Presentation_name Expand the T-matrix by eigenfunctions Lorentzian weight function width. This E-dependence now treated explicitly.

10Managed by UT-Battelle for the U.S. Department of Energy Presentation_name Preliminary Results: Eigenvalues/vectorsAverage RatioSQRT(Variance) E-independent E-dependent Computation parameters: Eigenvalues/vectors computed at 100 energies spanning MeV 1600 equidistant Q-levels 40 channels 20 equidistant radial points where H PQ set to a Gaussian-distributed random interaction E = 20 MeV 100 E’ points for Lorentzian averaging between 18 and 22 MeV Lorentzian averaging width I = 0.5 MeV s-wave only Strongly overlapping resoances

11Managed by UT-Battelle for the U.S. Department of Energy Presentation_name Test approximations in KKM derivation The E-dependence makes E-averaging more accurate Preliminary results are analyzed. Random Phase Hypothesis

12Managed by UT-Battelle for the U.S. Department of Energy Presentation_name HPC progress report (by K. Roche)

13Managed by UT-Battelle for the U.S. Department of Energy Presentation_name Year 5 plan Complete parallel KKM with E-dep. eigenvalues/vectors Test approximations in derivation of KKM cross sections Publish the KKM work (including the work on doorways)