Bulletin of the American Physical Society
2019 Fall Meeting of the APS Division of Nuclear Physics
Volume 64, Number 12
Monday–Thursday, October 14–17, 2019; Crystal City, Virginia
Session KE: Mini-Symposium: Short Range Correlations and Bound Nucleon Structure Across Scales II |
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Chair: Doug Higinbotham, JLab Room: Salon 5 |
Wednesday, October 16, 2019 8:30AM - 9:06AM |
KE.00001: Short Range Correlations in Nuclei and in Nucleons Invited Speaker: Misak Sargsian We discuss the phenomenon of short range correlations~(SRCs) in strongly interacting Fermi systems, considering the SRCs of nucleons in the nucleus and SRCs of quarks in the nucleon. We demonstrate how the SRC approach allows to introduce a new theoretical framework for calculation of the high momentum component of bound state wave functions of both nuclei and nucleons. We review how the several properties of multi-nucleon SRCs predicted in theory have been confirmed in recent experiments as well as discuss properties of multi-patron correlations in the nucleon and prospects of their experimental studies. The talk will address also the relevance of SRC studies to the advance of our understanding of the structure of cold-dense nuclear matter. [Preview Abstract] |
Wednesday, October 16, 2019 9:06AM - 9:18AM |
KE.00002: SRC Pairs in Light Nuclei Andrew Denniston Semi-inclusive nucleon knockout measurements on heavy asymmetric nuclei have been a very useful tool for measuring Short Range Correlated (SRC) pairs. While these types of studies have provided interesting results, many body nuclear systems cannot easily be related to theory. On the other hand, a study of light nuclei such as Helium-4 and Helium-3 would allow for a more accurate comparison between experiment and ab initio calculations. In this talk I will present new studies of single nucleon knockout measurements in Helium isotopes that can be calculated exactly. [Preview Abstract] |
Wednesday, October 16, 2019 9:18AM - 9:30AM |
KE.00003: Inclusive Short-range Correlation Measurement with 3H and 3He at JLab Shujie Li, Douglas Higinbotham The nucleon-nucleon potential has a strong repulsive core. When a two-nucleon (sub)system falls into this range, they will interact strongly and move away from each other with large momentum. In electron Quasi-elastic(QE) scattering, these so-called short-range correlation(SRC) pairs in nuclei produce events with nucleon initial momentum above the Fermi level.
Previous experiments reported a neutron-proton pair (isosinglet) dominance in high-momentum nucleons. This n-p dominance is believed to cause a scaling behavior of nuclei inclusive cross section ratios at Bjorken x between 1.4 and 3 where the high-momentum nucleons dominate. At Jefferson Lab Hall A we checked this n-p dominance of SRC via the electron scattering on A=3 nuclei system. The 3H to 3He inclusive cross section at $1 |
Wednesday, October 16, 2019 9:30AM - 9:42AM |
KE.00004: New SRC ratios from Hall C at JLab Casey Morean Inclusive cross section ratio measurements at Jefferson Lab during the 6 GeV era yielded precision EMC and SRC results, in the process suggesting a correlation between the two. The upgrade to 11 GeV at Jefferson Lab has allowed for further investigation of the EMC and SRC phenomena, and data has been collected on new nuclear targets: boron-10 and boron-11. The detector calibrations and boiling corrections for the extraction of these cross-sections have been completed, and the status of the inclusive SRC ratio analysis will be presented. [Preview Abstract] |
Wednesday, October 16, 2019 9:42AM - 9:54AM |
KE.00005: Quantum Monte Carlo calculations of lepton-nucleus interactions Saori Pastore In this talk, I will present recent results of Quantum Monte Carlo calculations of lepton-nucleus interactions, including lepton-nucleus scattering and electroweak decays in light nuclei. [Preview Abstract] |
Wednesday, October 16, 2019 9:54AM - 10:06AM |
KE.00006: Inclusive lepton-nucleus scattering from Quantum Monte Carlo Alessandro Lovato One of the challenges in quantum many-body physics is calculating the electroweak response of a nucleus by fully accounting for the dynamics of its constituent nucleons. Electron-scattering experiments have been pivotal to expose the role of nuclear correlations and in particular their spin-isospin dependence in the initial target state. Besides, accurate calculations of lepton-nucleus scattering are of paramount importance to the accelerator-neutrino experimental program. Greens function Monte Carlo (GFMC), using as inputs realistic Hamiltonian and consistent electroweak currents, enables first-principles calculations of nuclear electroweak responses in the quasi-elastic region. I will present our GFMC results for electron and neutrino scattering on $^{12}$C, induced by electromagnetic-, neutral-, and charged-current transitions. I will argue how the strength and energy-dependence of two-nucleon processes associated with correlation effects and interaction currents are crucial in providing the most accurate description of lepton-nucleus scattering in the quasi-elastic regime. [Preview Abstract] |
Wednesday, October 16, 2019 10:06AM - 10:18AM |
KE.00007: Quenching of Spectroscopic Factors: Short- and long-range correlations effects in a phenomenological model. Stefanos Paschalis, Marina Petri, Augusto Macchiavelli The independent-particle model of the nucleus has provided a solid framework to explain many nuclear properties. Residual interactions between nucleons, both short- and long-range, modify the mean-field approximation and the pure independent-particle picture in the form of quasi-particles. Notably, these correlations are thought to be the reason for the quenching of spectroscopic factors observed in (e,e’p), (p,2p) and transfer reactions [1]. Inspired by the results of Ref. [2], we proposed a phenomenological model to examine the role of short- and long-range correlations and their evolution in asymmetric systems [3]. Our approach correlates the observed [2] increase of the high-momentum component of the proton momentum density in a neutron-rich nucleus with the reduced proton occupancies for states below or near the Fermi level as a function of (N-Z)/A. In this contribution we extend the model to capture effects of weak binding that may play a role in reactions with exotic beams. Furthermore, we discuss the implications of our SRC results on the symmetry energy and potential changes in charge radii. [1] W. Dickhoff and C. Barbieri, PPNP 52 (2004) 377 [2] M. Duer et al., Nature, 560 (2018) 617 [3] S. Paschalis, et al. arXiv:1812.08051v2 [nucl-ex] [Preview Abstract] |
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