Monday, 5 June, 2017

14:00 - 14:30

Refreshments + organization

14:30 - 15:30

"Quantum chaos and thermalization in a small isolated system of interacting particles"

Vladimir Zelevinsky
Michigan State University, USA

Abstract: Atomic nuclei belong to the class of mesoscopic quantum systems with strong interaction between constituents. In mesoscopic systems, the presence of statistical features coexists with the opportunities to study, theoretically and experimentally, individual quantum states. Statistical aspects include chaotic regularities of spectra, wave functions and reaction amplitudes, leading to thermalization without any external heat bath. Strong interactions mix simple particle states creating complicated manybody functions with characteristic signatures of quantum chaos. This allows to treat the system statistically using thermodynamic concepts and obtain physical results avoiding the diagonalization of prohibitively huge Hamiltonian matrices. The variation of the Hamiltonian displays the special role of certain matrix elements responsible for collective phenomena on the background of chaos driven by numerous collision-like interactions. Some theoretical problems are still waiting for their solution.

15:30 - 16:00

16:00 - 17:00

"Study of Short Range Correlations via the A(e,e'n) reaction"
Meytal Duer
Tel Aviv University
Abstract: Without short range interaction, the Pauli exclusion principle causes the majority nucleons (usually neutrons) in an asymmetric nucleus to have higher average momentum than the minority. High-energy electron scattering measurements showed that the short range interaction between the nucleons mainly form correlated high momentum neutron-proton pairs in the nucleus. Thus, in neutron-rich nuclei, protons have greater probability than neutrons to have momentum larger than the Fermi momentum. Based on our new data from CLAS at Jefferson Laboratory we claim that this results in protons having higher average momentum than neutrons, i.e., an inversion of the momentum sharing between majority and minority nucleons.


LOCATION: The next joint Nuclear/Hadronic Physics seminar for this year will take place on Monday afternoon, June 5, 2017, in Kaplun building, room #103 at the campus of Tel Aviv University. For more information on entrance/parking please contact Riki at 03-6408587 or 03-6408192 , e-mail: riki@post.tau.ac.il.