# Jerry Draayer

#### Roy P. Daniels Professor of Physics

LSU Distinguished Research Master

Ph.D., 1968 - Iowa State University

Louisiana State University

Department of Physics & Astronomy

221-E Nicholson Hall, Tower Dr.

Baton Rouge, LA 70803-4001

225-578-6844-Office

draayer@lsu.edu

### Research Interests

#### Nuclear Theory and Computational Physics

Our program is focused on the low-energy structure of atomic nuclei. The challenge is to understand nuclear collective phenomena, like rotations and vibrations, in terms of interactions between the constituent nucleons. Both microscopic (shell-model) and the macroscopic (collective) pictures are believed to be applicable because of the coexistence of regular motion, like that associated with closed orbits in classical physics, and a background of irregular or chaotic behavior, as for open classical orbits. Algebraic (group theory), many-body, and high-performance computing methodologies are combined in a study of strongly deformed nuclei. Examples include enhanced electromagnetic transition rates, superdeformed configurations, and single as well as double beta decay strengths in rare earth and actinide nuclei. Another area of interest is nonlinear phenomena, in particular, analytic and numeric tools for dealing with nonlinear processes, consequences of nonlinear couplings in physical systems, and how nonlinear effects are manifest in atomic nuclei.

### Current and Select Publications

- T. Dytrych, K.D. Sviratcheva, C. Bahri, J.P. Draayer and J.P. Vary, "Dominant role
of symplectic symmetry in 'ab initio' no-core shell model results for light nuclei,"
*Phys. Rev. C***76**, 014315 (2007). - Tomas Dytrych, Kristina D. Sviratcheva, Chairul Bahri, Jerry P. Draayer and James
P. Vary, " Evidence for symplectic symmetry in Ab initio no-core shell model results
for light nuclei,"
*Phys. Rev. Lett.***98**, 162503 (2007). - K.D. Sviratcheva, J.P. Draayer and J.P. Vary, "Dynamical symmetries reflected in realistic
interactions," to appear in the proceedings of 25th International Workshop on Nuclear
Theory, Rila, Bulgaria, 26 June-1 July 2006.

e-Print: nucl-th/0703067 - K.D. Sviratcheva, A.I. Georgieva and J.P. Draayer, "Microscopic description of isospin
mixing pairing correlations in the framework of an algebraic Sp(4) model,"
*Bulg. J. Phys.***32**, 159-174 (2005). - K.D. Sviratcheva, C. Bahri, A.I. Georgieva and J.P. Draayer, "Physical significance
of q deformation and many-body interactions in nuclei,"
*Phys. Rev. Lett.***93**, 152501 (2004).