# Theoretical Nuclear Physics Group

**Group Members**

- Eirini Mavrommatis, Associate Professor (Ret.)
- Collaborators: Graduate and undergraduate students, UoA professors and Researchers from Greece and abroad (USA, Italy, Germany, Austria, Ukraine).

**Short Description**

The group is active in research mainly on Theoretical Nuclear Physics (studies of nuclei and multi-nucleon system of nuclear matter and neutron matter). This is closely related to Nuclear Astrophysics, Many-Body Theory, Complex Systems Theory and Artificial Intelligence. It comprises mainly the following two fields:

- Microscopic theory of multi-nucleon systems: Study of correlations (short- and long-range, pairing, complexity and chaotic dynamics)
- Development of Statistical Modeling of various nuclear properties using statistical analysis methods (neuronic networks etc)

Pythagoras Program – Artificial Intelligence Modeling

Main aims are: i) enrich knowledge of the structure and dynamics of nuclei (focusing on nuclei far from stability) and multi-nucleon systems ii) obtain reliable estimations of nuclear observables that are necessary for the understanding of several astrophysical phenomena and processes iii) develop theoretical-calculational techniques for the microscopic quantum theory of strongly-interacting particles, and the scattering theory due to time-dependent potentials, as well as the development of statistical machine learning methods.

**Selected Publications**

- M. Petraki, E. Mavrommatis, O. Benhar, J.W. Clark, A. Fabrocini, S. Fantoni,
*Final-State Interactions in the Response of Nuclear Matter*, Phys. Rev. C67, 014605 (2003) - S. Athanassopoulos, E. Mavrommatis, K.A. Gernoth, J.W. Clark,
*Nuclear Mass Systematics Using Neural Networks*, Nucl. Phys. A743, 222 (2004) - P. Papakonstantinou, J. Wambach, E. Mavrommatis and U. Yu. Ponomarev,
*Nuclear Vorticity and the Low-Energy Nuclear Response: Towards the Neutron Drip Line*, Phys. Lett. B604, 157 (2004) - A. Shebeko, P. Papakonstantinou, E. Mavrommatis,
*The One-Body and Two-Body Density Matrices of Finite Nuclei with an Appropriate Treatment of Center of Mass - Motion*, Eur. Phys. J. A77, 143 (2006) - P.K. Papachristou, E. Mavrommatis, V. Constantoudis, F.K. Diakonos and J. Wambach,
*Nonlinear Classical Model for the Decay Widths of Isoscalar Monopole Resonances*, Phys. Rev. C77, 044305 (2008) - E. Pavlou, E. Mavrommatis, J.W. Clark,
*A CBF Calculation of Superfluidity in the Inner Crust of Neutron Stars*, 18th Hellenic Symposium on Nuclear Physics HNPS (2009); in submission to Nucl. Phys. A. - N.J. Costiris, E. Mavrommaris, K.A.Gernoth, J.W. Clark,
*Decoding Beta-Decay Systematics: A Global Statistical Model for β- Halflives*, Phys. Rev. C80, 044332 (2009);*Statistical Global Model of β- -Halflives and r-Process Nucleosynthesis*, arXiv: 1309.0540 (nucl-th), in submission to Phys. Rev. C.

**Research Gramts**

*Theoretical Nuclear Physics, UoA*

Occasional funding by GSRT, NSF (USA) and EU

**Group Websites**

- http://www.pythaim.phys.uoa.gr

(Dedicated to the activity: Pythagoras Program – Artificial Intelligence Modeling)