Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,
Tel (Office): (865) 574-6124 (FAX): (865) 574-1268
As science probes ever more extreme facets of the universe, the role of nuclear theory in confronting fundamental questions in nature continues to deepen. Long considered a phenomenological discipline, advances in many-body methods together with our treatment of nuclear and electroweak forces are rapidly transforming modern nuclear theory into a true first-principles discipline. In this talk I will discuss the valence-space formulation of the in-medium similarity renormalization group (IMSRG), illustrating how it expands the scope of ab initio theory to essentially all properties of light, medium-mass nuclei and beyond. When based on two- and three-nucleon forces and meson-exchange currents derived consistently from chiral effective field theory, this powerful approach allows predictions of structure properties to the Sn isotopes, including the nuclear driplines into the pf shell region. In particular I will focus on recent extensions to fundamental problems in nuclear-weak physics, including a proposed solution of the long-standing puzzle of quenching in beta decays, ab initio calculations of neutrinoless double-beta decay, and WIMP-nucleus scattering cross sections relevant for dark matter direct detection searches.