Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session G05: ShortRange Correlations in FewBody SystemsInvited

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Sponsoring Units: GFB DNP Chair: Or Hen, Massachusetts Institute of Technology Room: Sheraton Governor's Square 14 
Sunday, April 14, 2019 8:30AM  9:06AM 
G05.00001: Abinitio calculations of scattering reactions Invited Speaker: Noemi Rocco I will present the results we obtained for chargedand neutralcurrent transitions in neutrino scattering processes off 12C and 16O employing nuclear spectral functions obtained within the correlatedbasis function theory and the selfconsistent Green's function approach. The role played by relativistic twobody electroweak current operators and the pionproduction mechanisms, included for the first time in our calculations, will be discussed in detail. 
Sunday, April 14, 2019 9:06AM  9:42AM 
G05.00002: Quantum Monte Carlo calculations of light nuclei using local chiral interactions Invited Speaker: Diego Lonardoni Predicting the emergence of nuclear properties and structure from first principles is a formidable task. A fundamental question is whether it is possible to describe nuclei and their global properties, e.g., binding energies, radii, transitions, and reactions, from microscopic nuclear Hamiltonians constructed to reproduce only fewbody observables, while simultaneously predicting properties of matter, including the equation of state and the properties of neutron stars. Despite advanced efforts, definitive answers are not available yet. In this talk, I will approach the problem by presenting quantum Monte Carlo results for nuclei up to A=16, obtained by employing local chiral interactions. Such interactions include consistent two and threenucleon potentials up to nexttonexttoleadingorder, and they have been fit to fewbody observables probing the physics of light nuclei, with particular attention to T=3/2 physics. Our results show that such local chiral interactions give a very good description of the groundstate properties of nuclei (at least) up to ^{16}O, while providing an equation of state of pure neutron matter compatible with astrophysical observations of neutron stars. Single and twonucleon momentum distributions and derived quantities have been used to explore shortrange correlation effects, showing interesting connections with information extracted from lepton scattering experiments on nuclei. 
Sunday, April 14, 2019 9:42AM  10:18AM 
G05.00003: Probing correlations in A=3 systems using electron scattering Invited Speaker: Reynier Cruz Torres We report the first measurement of the (e,e'p) reaction crosssection ratio for Helium3 (3He) relative to Tritium (3H). The measurement covered a missing momentum range of 40 <= Pmiss <= 550 MeV/c, at large momentum transfer (<Q2> = 1.9 (GeV/c)^2) and xB > 1, which minimized contributions from non quasielastic (QE) reaction mechanisms. The data is compared with calculations using a planewave impulse approximation (PWIA) and a realistic threenucleon spectral function. The measured and PWIA calculated crosssection ratios agree within the measurement accuracy of about 3% up to the nuclear Fermimomentum (250 MeV/c) and differ by 30% at higher momenta. Final state interaction (FSI) calculations using the generalized Eikonal Approximation indicate that FSI should change the 3He/3H crosssection ratio for this measurement by less than 5%. This suggests that the 30% difference between the 3He/3H experimental ratio and momentum distribution ratios at large missing momenta could be due to the underlying NN interaction, and thus could provide significant new constraints on the previously looselyconstrained shortdistance parts of the NN interaction. 
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