Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session L08: From Deuterium to Light Nuclei: Measurements and Ab-Initio TheoryInvited Live
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Sponsoring Units: GFB DNP Chair: Or Hen, Massachusetts Institute of Technology Room: Roosevelt 3 |
Sunday, April 19, 2020 3:30PM - 4:06PM Live |
L08.00001: From Light-Nuclei to Neutron Matter Within Chiral Dynamics Invited Speaker: M. Piarulli A major goal of nuclear theory is to explain the wealth of data and peculiarities exhibited by nuclear systems in a fully microscopic approach. In such an approach, which we refer to as the basic model of nuclear theory, the nucleons interact with each other via many-body (primarily, two- and three-body) effective interactions, and with external electroweak probes via effective currents describing the coupling of these probes to individual nucleons and many-body clusters of them. These effective interactions and currents are the main inputs to ab-initio methods that are aimed at solving the many-body Schrodinger equation associated with the nuclear system under consideration. In this talk, I will review recent progress in Quantum Monte Carlo calculations of low-lying spectra and electroweak properties of light nuclei as well as nucleonic matter equation of state. Emphasis will be on calculations based on chiral effective eld theory approach. [Preview Abstract] |
Sunday, April 19, 2020 4:06PM - 4:42PM Live |
L08.00002: Probing the Deuteron Wave Function Using High Q$^2$ d(e,e'p)n Measurements Invited Speaker: Werner Boeglin As the only bound nuclear two-body system, the deuteron occupies a very special place in nuclear physics. Its wave function can be calculated with very high accuracy and as a consequence a wide variety of observables can be predicted and compared to increasingly precise experimental results. The exclusive electro-disintegration of the deuteron provides one of the most direct tests of the deuteron wave function provided that other contributions to the cross section such as final state interactions (FSI), meson exchange currents (MEC) and isobar configuration (IC) are suppressed. Recent experiments at Jefferson Lab at $Q^2 > 2$ (GeV/c)$^2$ demonstrated the existence of kinematic regions where FSI, MEC and IC are indeed suppressed. The measured cross sections can be successfully described by Eikonal based models predicting strongly anisotropic FSI contributions. An overview of experimental results will be presented as well as first results of a d(e,e'p)n measurement in Hall C at $Q^2 = 4.5 \pm 0.5$ (GeV/c)$^2$ where bound nucleon momenta up to a 1 GeV/c have been probed. At higher bound nucleon momenta significant discrepancies between modern calculations and the experimental data were observed. [Preview Abstract] |
Sunday, April 19, 2020 4:42PM - 5:18PM Live |
L08.00003: Scale-Dependent View of d(e,e'p) Measurements Invited Speaker: Richard Furnstahl Isolating nuclear structure properties from knock-out reactions in a process-independent manner requires a controlled factorization, which is always to some degree scale and scheme dependent. Understanding this dependence is important for robust extractions from experimental measurements, to correctly use the structure information in other processes, and to understand the impact of approximations for both. We discuss scale dependence using deuteron electrodisintegration as perhaps the simplest example. Our principal tool is the similarity renormalization group, which we use to evolve the components of a theoretical calculation—the initial deuteron wave function, the current operator, and the final-state interactions (FSIs)—to different resolution scales. Visualizations show that the physical picture of deuteron electrodisintegration is scale dependent and not just kinematics dependent. As a result, intuition about physics such as the role of short-range correlations in particular kinematic regimes can be strongly scale dependent. [Preview Abstract] |
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