2024 Workshop on Polarized Sources, Targets, and Polarimetry

Session

Neutrons

Sep 27, 2024, 1:50 PM

Cebaf Center Auditorium (Jefferson Lab)

Conveners

Neutrons

• Josh Pierce (Oak Ridge National Laboratory)

85. Spin Transport for the PSI n2EDM Experiment

Christopher Crawford (University of Kentucky, Dept. Physics & Astronomy)

9/27/24, 1:50 PM

The CP-violating neutron electric dipole moment (nEDM) is sensitive to physics beyond the Standard Model which is needed to explain the baryon asymmetry in our universe. The most precise measurement of the nEDM, carried out at Paul Scherrer Institute (PSI), is consistent with zero with an upper limit of $1.8\times10^{−26}~ e$ cm at the 90% confidence level. To reach an order of magnitude...

64. The pNab experiment and the quest for ever better neutron beam polarization

Stefan Baessler (University of Virginia)

9/27/24, 2:10 PM

The pNab, a follow-up to the Nab experiment that is currently starting to take data at the Fundamental Physics Beamline of the Spallation Neutron Source at Oak Ridge National Lab, aims to determine the beta asymmetry A in the beta decay of polarized free neutrons, and with high precision. In combination with others, this measurements will shed light on recent hints for a violation of the...

91. Characterizing the AFP Spin Flipper for the Nab Experiment

Rebecca Godri

9/27/24, 2:30 PM

The Nab experiment at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL) aims to yield a precise measurement of the electron-neutrino correlation parameter, a, to ∆a/a ≈ 3 × 10$^{−4}$ from the beta-decay of the free neutron. To achieve Nab’s precision goal, it is required that there is near-zero polarization of the neutron beam. To measure any residual...

102. Polarized neutron pseudomagnetic precession in polarized 3He and (associated) precision NMR measurements in SEOP cells

Sepehr Samiei

9/27/24, 2:50 PM

Three-nucleon (3N) interactions contribute ~5% of the binding energy of nuclei. Our ignorance of this major component of nucleon interactions limits the ability of nuclear theory to compute the properties of stable nuclei and predict the properties of the many new nuclei that radioactive beam facilities will create in the future. More accurate measurements in nuclear few body systems are...

105. Searching for Exotic Polarized-Electron Polarized-Neutron Interactions in Polycrystalline Terbium Iron Garnet Using Slow Neutron Polarimetry

Krystyna Lopez (Indiana University)

9/27/24, 3:10 PM

Rare-earth iron garnets are known examples of Néel ferrimagnetism. Polycrystalline terbium iron garnet (Tb₃Fe₅O₁₂, or TbIG) exhibits a net electron polarization and zero internal magnetization at its compensation temperature $T_c$, and the NSR-Ferrimagnets Collaboration has used this polarized electron target to search for exotic spin-dependent interactions...