Conveners
Spin physics in Nuclear Reactions and Nuclei: Nuclei I
- Elena Long (University of New Hampshire)
Spin physics in Nuclear Reactions and Nuclei: Nuclear IV
- Elena Long (University of New Hampshire)
Spin physics in Nuclear Reactions and Nuclei: Nuclear IV
- Ian Cloet (Argonne National Laboratory)
I will describe a framework defining benchmarks for the analysis of polarized exclusive scattering cross sections using physics constraints including lattice QCD, built into machine learning (ML) algorithms. Both physics driven and ML based benchmarks are applied to a wide range of deeply virtual exclusive processes through explainable ML techniques with controllable uncertainties. The...
Deeply Virtual Compton Scattering is the most direct channel to access Generalized Partons Distributions (GPD) and understand more about the 3D structure of the nucleon, the origin of its spin and the forces at play within it. Complete extraction of GPDs require the use of polarized electron beams and polarized nucleon targets in DVCS measurements.
In 2009, the CLAS collaboration measured...
The polarized target program in Hall D at Jefferson Lab, which began to measure the Gerasimov-Drell-Hearn (GDH) integrand on hydrogen and deuterium, presents a unique opportunity for nuclear physics with a photon probe. The polarized target apparatus will allow polarization observables to be measured with a photon beam on polarized nuclei such as Li-7, C-13, N-15, O-17, and F-19 with photon...
As the simplest nucleus, the generalized parton distributions of the deuteron are highly desirable. These should be calculated in a manifestly covariant manner in order to ensure polynomiality, which is needed to allow extraction of the energy-momentum tensor. However, the Bethe-Salpeter equation is notoriously difficult to solve, with approximations usually breaking covariance. Thus, as an...
Recent results on the spin effects in deuteron-proton elastic scattering, beam and focal polarimetry using polarized deuteron and proton beams from new polarized ion source at Nuclotron-JINR facility are discussed. The vector Ay and tensor Ayy and Axx analyzing powers in deuteron-proton elastic scattering at large transverse momenta obtained at internal target at Nuclotron in the energy...
Constant current continuous wave Nuclear Magnetic Resonance (NMR) has been an essential tool for solid-state polarized target experiments in Nuclear and High-energy physics. Q-meter based phase-sensitive detection can provide accurate monitoring of the polarization over the course of a scattering experiment but is frequently limited by significant noise and systematic errors that arise during...
Understanding the origin of the spin of nucleons is an overarching challenge for nuclear physics research. The spin structure information of proton and neutron are both crucial for flavor separation study but there are a very limited number of neutron spin measurements due to the lack of a free neutron target. Therefore, Polarized 3He has been used as an effective neutron target for neutron...
We demonstrate that paradigm shift from considering the deuteron as a system of a bound proton and neutron to considering it as a pseudovector composite system from which one observes emerging proton and neutron results in the possibility of probing a new “incomplete” P-statelike structure on the light front (LF). This occurs at large internal momenta, which can be probed in a high energy...
Tensor polarization enhances sensitivity to short-range, high-momentum QCD effects, which provide important insight to the deuteron wavefunction. Knowing the properties of the deuteron’s nucleon-nucleon potential is essential for understanding short-range correlations as they are largely dependent on the tensor force that is described by the nucleon-nucleon potential. In the quasielastic...
Nuclear Short Range Correlations (SRCs) are pairs of nucleons which exist at short relative distance and high relative momentum within the nucleus. These SRC pairs have significant impacts on nuclear structure and have been extensively studied using hard quasi-elastic electron-scattering data. Interpretations of these hard scattering data rely heavily on our understanding of reaction...
Diquark bonds formed with valence quarks from two different nucleons have been proposed as the fundamental quantum chromodynamics (QCD) physics causing short-range correlations (SRC) in nuclei. The 12-quark "hexadiquark" hidden-color QCD state - effectively two SRC bound together - is also proposed as the cause of distortions of quark distribution functions in nuclei. While SRC have been...
