[Theory-seminars] Theory Seminar Tomorrow - Harald Griesshammer (in person, L102)

[Gloria Montana-Faiget]

Dear all,

Tomorrow at 1:00PM EST, we will have a hybrid seminar given by Harald W. Griesshammer of George Washington University, in person in CC L102 and on the following Zoom link:

https://jlab-org.zoomgov.com/j/1608047340?pwd=JidnNPHQ8ttJ2sLd2UGUCvB5BrVX4C.1

Please see below for the title and abstract.

Theory Seminar: November 25th, 1pm EST (hybrid)

Speaker: Harald W. Griesshammer (George Washington University)

Title: Nuclear Binding in the Unitary Limit: Are NN Forces as Important as We Think?

Abstract: Theorists love the unitarity limit: The nucleon-nucleon (NN) S-wave binding energies are zero, the scattering lengths infinite, and there are a lot more symmetries. While the NN system has no scale, that does not mean that all binding energies of nuclei are zero or infinite: the three-nucleon (3N) system has one dimensionful scale set by the triton-binding energy and related to the Efimov effect. This 3N scale sets the only low-energy scale of all observables in nuclear physics. But how useful is that to understand the structure of nuclei at the physical point? We speculate that nuclear physics resides in a sweet spot: bound weakly enough to be insensitive to the details of the nuclear interaction but dense enough that the NN scattering lengths are perturbatively close to the unitarity limit. In this paradigm change, details of two-nucleon interactions are less important than three-nucleon interactions to explain the complexity and patterns of the nuclear chart. I also comment on tests in heavier nuclei and nuclear matter and how the picture changes when the dimensionful scales of the pion-exchange force are added.

We look forward to seeing you there!

Best regards,

Joe, Zheng-Yang, and Gloria


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