Nuclear Physics Joint Seminar

Michael Kohl, Hampton University, USA

Bezalel Bazak, Hebrew University

30 December 2013, 14:30 
Hebrew University, Jerusalem 
Nuclear Physics Joint Seminar

14:30 - 14:45 - Refreshments


14:45 - 15:45 - First talk

"A framework of low-energy precision experiments", Michael Kohl, Hampton University, USA


Two-photon exchange, the proton charge radius puzzle, heavy photons from dark matter, and lepton universality violation - it is possible that these phenomena are all linked together. I will present an overview of four experiments underway that are well suited to sharpen the presently blurry picture of low-energy nuclear physics.


15:45 - 16:15 - Coffee break


16:15 - 17:15 - Second talk

"The Photo Response Function of Universal Trimers", Bezalel Bazak, Hebrew University, Jerusalem


Considering one-body and two-body currents, we study the electro-magnetic response of universal bosonic trimers. Analyzing the relative importance of these currents we identify two physical scenarios (i) Normal hierarchy, where naive power counting holds and the one-body current dominates, and (ii) Strong hierarchy, where the one-body current is suppressed. For both scenarios we observe that at the high frequency tail, the response function exhibits log periodic oscillations in all partial waves. In contrast, near threshold log periodic oscillations  appear only in the leadings-wave components. These oscillations are the fingerprints of universal Efimov physics. We discuss the relevance of this effect to contemporary experiments in ultracold atoms.


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