Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session KF: Mini-Symposium: Advances and Opportunities in Polarized Targets and Beams II |
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Chair: Narbe Kalantarian, Virginia Union University Room: Berkeley & Clarendon |
Wednesday, October 13, 2021 11:30AM - 12:06PM |
KF.00001: Polarized internal target experiments with the EIC beams Invited Speaker: Bogdan B Wojtsekhowski A fixed target experiment, similar to HERMES but with much higher luminosity, at EIC will provide physics on highly polarized H and D targets, including a tensor polarized deuteron. The internal target with the hadron beam also has a significant physics program. The high intensity photon beam is also possible for use with an external target. We will present the scheme of possible detectors and ideas on an initial physics program. |
Wednesday, October 13, 2021 12:06PM - 12:18PM |
KF.00002: Far-forward detection at the EIC with ECCE Igor Korover A new Electron-Ion Collider (EIC) is currently being developed in the US with the goal of revolutionizing our understanding of the fundamental structure of matter and the theory of Quantum Chromodynamics. To fully utilize the EIC capabilities, advanced detectors are being developed in conjunction with simulation studies that show the major impact of an optimized detector design on the scientific output of the EIC program. In this talk, I will present the ECCE consortium concept for the far forward/backward region of the EIC detector: this is essential for definitive studies of bound nucleon structure, neutron spin, meson structure, and more. |
Wednesday, October 13, 2021 12:18PM - 12:30PM |
KF.00003: 102-fold Improvement in Hyperpolarized 131Xe Production Using Spin Exchange Optical Pumping and the First Measurement of the Spin-Dependent Scattering Length in Polarized Neutron-Polarized 131Xe Using Pseudomagnetic Precession Hao Lu, Boyd M Goodson 131Xe (I=3/2) has a strong quadrupole moment which leads to very a fast nuclear spin relaxation and is extremely hard to polarize. We achieved 131Xe polarization-density product up to 7.6±1.5% in ~8.5×1020 nuclei using a Spin Exchange Optical Pumping system optimized via an in situ NMR spectrometer. This is a two-order-of-magnitude improvement over previous attemptsa. It has since enabled our first measurement of spin-dependent forward scattering amplitudes in polarized neutron-polarized 131Xe interaction. We performed neutron pseudomagnetic precession experimentsb in polarized 131Xe and 129Xe with the J-NSE Neutron Spin Echo spectrometer at FRM II reactor facility in Germany. The incoherent scattering lengths of Xe nuclei from pseudomagnetic precession measurements will help determine the sensitivity of envisioned Time Reversal Invariance Violation experiments on the 3.2 eV p-wave resonance of 131Xec. |
Wednesday, October 13, 2021 12:30PM - 12:42PM |
KF.00004: Dynamic Nuclear Polarization for Neutron Scattering: Status and Outlook Josh Pierce Elastic and inelastic scattering of slow neutrons are well established techniques for determining the properties of many different classes of materials, from proteins and soft matter, to quantum materials. Combining polarized neutron beams with Dynamic Nuclear Polarization of samples (especially those containing hydrogen) allows the experimenter to take advantage of the spin dependence of the scattering to use a number of techniques that would not be possible with polarized neutrons alone. A description of some of the techniques will be given as well as some examples from different neutron scattering facilities. The status and outlook of the Dynamic Nuclear Polarization program at Oak Ridge National Laboratory will be discussed, with an emphasis on the use of DNP to enhance measurements of diffraction from protein crystals. |
Wednesday, October 13, 2021 12:42PM - 12:54PM |
KF.00005: Preliminary investigations of a polarized target for the study of neutron unbound systems Georgia Votta, Paul L Gueye Measurements of spin observables are critical for the understanding of the role of spin-orbit, tensor, and nucleon-nucleon interactions. While they are an intrinsic part of scientific programs at worldwide facilities using electromagnetic beams, they are not routine although essential to understanding the structure and reactions of exotic nuclei. There are very limited facilities that are currently able to perform such experiments. The Facility for Rare Isotope Beams (FRIB) will start its operation in 2022. With its high luminosity, the possibility of a polarized target would enable access to a rich spin-dependent program up the neutron and proton drip lines. A preliminary study on the feasibility for such target will be discussed. |
Wednesday, October 13, 2021 12:54PM - 1:06PM |
KF.00006: Preliminary investigations of a compact polarized electron/positron linac for scattering experiment off rare isotopes Paul L Gueye, Letrell K Harris Ongoing workshops on existing and new possible future storage rings using rare isotopes for nuclear astrophysics applications have occurred within the past decades. While the ones in developments are primarily in the low energy regime (few 10s MeV/u), the Facility for Rare Isotope Beams (FRIB) is starting some investigations that would include both a low and high energy (few 100s MeV/u) rings. Coupling an electron linac with a storage ring would not only extend past and current scattering experiments from stable nuclei to exotic nuclei, but also open new physics opportunities not accessible previously. Such facilities are under developments in Japan (SCRIT at RIKEN) and in Europe (ELISE at FAIR and DERICA in Dubna). Recent technology advancements in both RF cavities (such as the Nb3Sn design at Cornell) and highly polarized electron/positron beams (such as the PEPPo concept at JLab) make a unique combination for the possibility of a high energy polarized e± linac that could be coupled with the high intensity, large rare isotope selection beams of the possible storage rings at FRIB. A preliminary study on the feasibility and performances of such linac will be presented and discussed. |
Wednesday, October 13, 2021 1:06PM - 1:18PM |
KF.00007: The Polarized-Target System for the SpinQuest Experiment at Fermilab Zulkaida Akbar, Dustin Keller The SpinQuest experiment at Fermilab aims to measure the Sivers asymmetry for the $\bar{u}$ and $\bar{d}$ sea quarks in the range of 0.1 $< x_{B} <$ 0.5 using the Drell-Yan production of dimuon pairs. A nonzero Sivers asymmetry would provide evidence for nonzero orbital angular momentum of the sea quarks. The proposed beam intensity is 1.5~$\times$~10$^{12}$ of 120 GeV unpolarized proton/sec. The experiment utilizes a target system consisting of a 5T superconducting magnet, transversely polarized NH$_3$ and ND$_3$ targets, a $^4$He evaporation refrigerator, a 140 GHz microwave source and a large pumping system. The expected average target polarization is 80$\%$ for the protons and 32$\%$ for the deuterons. The polarization will be measured with three NMR coils per target cell. A quench analysis and simulation in the superconducting magnet are performed to determine the maximum intensity of the proton beam before the magnet become resistive. A GEANT based simulation is used to calculate the heat deposited in the magnet and the subsequent cooling processes are modeled using the COMSOL Multiphysics. In this presentation, I will describe the polarized-target system installed for the SpinQuest experiment at Fermilab |
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