Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session C15: Mini-Symposium: Short Range Nuclear Structure IFocus
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Sponsoring Units: DNP Chair: Alexandra Gade, MSU and NSCL Room: Sheraton Plaza Court 4 |
Saturday, April 13, 2019 1:30PM - 2:06PM |
C15.00001: Recent developments in understanding short-range correlations Invited Speaker: Axel Schmidt The correlated pairing of nucleons at short-range is a universal phenomenon in nuclei, and leads to an appreciable fraction of nucleons (approximately 20% in medium-mass nuclei and larger) carrying significantly more momentum than the nuclear Fermi-momentum. Short-range correlations (SRCs) have far-reaching impacts especially in high-density nuclear matter, such as the matter at the cores of neutron stars. While the past few years have brought remarkable new insight into the natures of these correlations, there are still major unresolved questions, including the pair formation mechanism, the nature of the nucleon-nucleon force at extremely short range, and even the exotic possibility of three-nucleon correlations. In this talk, I will give a broad overview of recent progress on understanding SRCs and their impact on other problems in nuclear physics. I will present recent work that illuminates the role of SRCs in the so-called "EMC Effect," discuss how the theoretical framework called "Generalized Contact Formalism" can help us interpret experimental results, and examine the idea of SRCs as a laboratory for studying the short-range nucleon-nucleon interaction and even probing the repulsive core. |
Saturday, April 13, 2019 2:06PM - 2:18PM |
C15.00002: "Probing the Deuteron at Short Distances on the Light-Front" Frank Vera, Misak M Sargsian We study electro-disintegration of the deuteron at high momentum transfer aimed at studies of the deuteron at short-distances. Such studies are relevant for number of phenomena related to a high density nuclear matter, relativistic NN-interaction and nuclei structure at short distances. Due to relativistic nature of the process, the theoretical framework is based on light-front approach which allows a complete relativistic treatment of all components of the reaction, such as deuteron wave function, bound nucleon electromagnetic current as well as final state interaction of fast struck nucleon with the spectator nucleon. The main advantage of the approach is that it allows effectively to account for the vacuum fluctuation contributions which are essential for processes that probe deuteron with large relative momentum. We compare our calculations with the prediction of non-relativistic calculation as well as provide a preliminary comparisons with the experimental data being measured at Jefferson Lab. |
Saturday, April 13, 2019 2:18PM - 2:30PM |
C15.00003: Lepton-scattering off nuclei in the Short-Time-Approximation Saori Pastore In this talk, I will present recent results on electron-scattering off $^4$He and $^{12}$C in the Short-Time-Approximation. |
Saturday, April 13, 2019 2:30PM - 2:42PM |
C15.00004: Probing the nuclear interaction at neutron-stars densities Or Hen The nature of the nucleon-nucleon interaction at shorter distances, typical of dense nuclear systems such as neutron stars, is very poorly constrained experimentally. This limits our ability to describe the equation of state and other properties of such dense astrophysical systems. I will present new constraints on the short-distance behavior of the NN interaction. This is done by combining recent experimental advances in measurements of high-energy electron scattering data that isolate temporal short-distance, high-momentum, fluctuations in atomic nuclei and theoretical advances in describing high-Q2 electro induced knockout reactions using the new GCF framework. Considering states in the momentum range of 0.3 - 1.0 GeV/c, we observe a transition from a spin-dependent Tensor-force at MeV/c to spin-independent scalar-force. We quantify the onset of scalar-force dominance and observe that local interaction models, with a hard repulsive-core at short-distance, provide the best description of our data. |
Saturday, April 13, 2019 2:42PM - 2:54PM |
C15.00005: Modern Theories of Nuclear Forces and their Applications in ab initio Nuclear Structure Ruprecht Machleidt During the past two decades, chiral effective field theory has evolved into the authoritative approach to derive nuclear two- and many-body forces in a systematic and model-independent way. Nowadays, most ab initio calculations of nuclear structure and reactions are conducted with chiral forces. I will summarize the state of the art in the construction of high-quality chiral nuclear forces. Moreover, I will discuss the application of these forces in ab initio calculations of few-nucleon reactions and the structure of light and intermediate-mass nuclei. The order-by-order convergence of the theory will also be investigated.
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Saturday, April 13, 2019 2:54PM - 3:06PM |
C15.00006: Short-Range Correlations in Nuclei and Nuclear Matter Francesca Sammarruca, Laura Elisa Marcucci, Michele Viviani, Ruprecht Machleidt Nuclear dynamics at short distances is ruled by the short-range nuclear force. Short-range correlations (SRC) are responsible for the high-momentum components in the momentum distributions inside nuclei, which are very sensitive to the nature of the nuclear potential. In the past, momentum distributions in nuclei have been studied mostly with phenomenological or meson-theoretic potentials, such as AV18 or CD-Bonn, with or without the inclusions of three-nucleon forces. In our improving understanding of nuclear forces, chiral effective field theory (EFT) has emerged as the most advanced approach to the development of nuclear interactions. Thus, we have started a broad investigation of SRC in few-body systems [1] and nuclear matter based on high-quality chiral few-nucleon forces [2]. In this presentation, our recent findings and our work in progress [1] L.E. Marcucci, F. Sammarruca, M. Viviani. and R. Machleidt, arXiv:1809.01849. |
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