Symmetry energy: from nuclei to neutron stars

讲座题目：Symmetry energy: from nuclei to neutron stars

讲座时间：2016年6月22日下午16:30-18:00

讲座地点：中1-3113

报告人：Pawel Danielewicz教授，National Superconducting Cyclotron Laboratory，Michigan State University

摘要：Symmetry energy quantifies the changes in nuclear energy when isospin grows away from zero. Knowledge of the symmetry energy is critical when extrapolating from nuclei to neutron stars. Charge invariance of nuclear interactions implies that the dependence of energy on isospin is primarily quadratic. Relying on the charge invariance, we examine nuclear excitation energies to the isobaric analog states of ground states of other nuclei in the same isobaric chain. In this fashion we are able to extract symmetry-energy coefficients on a nucleus-by-nucleus basis. The coefficients turn out to have a strong mass dependence that can be tied to different contributions from different densities in nuclei with different mass. In consequence, we are able to deduce constraints on the symmetry energy in nuclear matter, as a function of density. The deduced constraints are narrow at subnormal densities, but spread out at normal density and above. Simultaneous analysis of elastic and quasielastic charge-exchange reactions may help narrowing the constraints. Finally, prospects to constraint the symmetry energy directly at supranormal densities, using charged pion yields are discussed.

报告人简介：

Prof. PawelDanielewicz

Education：

1981 Ph.D. (Physics), Warsaw University

1977 M.S. with Distinction (Physics), Warsaw University

Appointments:

1996- Professor, Department of Physics and Astronomy andNational Superconducting Cyclotron Laboratory,Michigan State University

1988-1996 Associate Professor, Department of Physics and Astronomy andNational Superconducting Cyclotron Laboratory,Michigan State University

1985-1990 Assistant Professor, Institute of Theoretical Physics,Physics Department, Warsaw University

1981-1984 Postdoctoral Research Associate, Lawrence Berkeley Laboratory,University of California

1981-1985 Senior Associate, Institute of Theoretical Physics,Physics Department, Warsaw University (on leave 1981-84)

1978-1981 Associate, Institute of Theoretical Physics,Physics Department, Warsaw University

1977-1978 Junior Associate, Institute of Theoretical Physics,Physics Department, Warsaw University

Honors:

2009 Fellow, American Physical Society

2004 Chair, Gordon Research Conference on Nuclear Chemistry

Most Significant Publications:

1. Symmetry Energy II: Isobaric Analog States, Pawel Danielewicz and Jenny Lee,Nucl. Phys. A 922, 1 (2014) [44 citations].

2. Symmetry Energy I: Semi-Infinite Matter, Pawel Danielewicz and Jenny Lee,Nucl. Phys. A 818, 36 (2009) [178 citations].

3. Analysis of Low-Momentum Correlations with Cartesian Harmonics, P.Danielewicz and S. Pratt, Phys. Lett. B 618, 60 (2005) [47 citations].

4. Introduction to Nuclear Reactions, C. Bertulani and P. Danielewicz, GraduateStudent Series in Physics, ISBN 0750309326, Institute of Physics Publishing,London, 2004 [72 citations].

5. Surface Symmetry Energy, P. Danielewicz, Nucl. Phys. A 727, 233 (2003) [210citations].

6. Determination of the Equation of State of Dense Matter, Pawel Danielewicz,Roy Lacey and William G. Lynch, Science 298, 1592 (2002) [Published online31 October 2002; 10.1126/science.1078070] [882 citations].

7. Production of Deuterons and Pions in a Transport Model of Energetic HeavyIon Reactions, P. Danielewicz and G. F. Bertsch, Nucl. Phys. A 533, 712 (1991)[267 citations].

8. Transverse Momentum Analysis of Collective Motion in Relativistic NuclearCollisions, P. Danielewicz and G. Odyniec, Phys. Lett. B 157, 146 (1985) [706citations]

9. Dissipative Phenomena in Quark-Gluon Plasmas, P. Danielewicz and M. Gyulassy, Phys. Rev. D 31, 53 (1985) [467 citations].

10. Quantum Theory of Nonequilibrium Processes, I., P. Danielewicz, Ann. Phys.(N.Y.) 152, 239 (1984) [773 citations].