Conveners
Application of spin and nuclear polarization techniques: Block 1
- Kenichiro Tateishi (RIKEN)
- Junpei Zhang (高能所)
Description
Conveners: Xin Tong, Tianhao Wang
Neutron beams generated at the China Spallation Neutron Source (CSNS) are dedicated for material characterization through scattering process. Polarization can be introduced before and after the neutron scatter with the sample so that neutron magnetic dipole interaction with local magnetization can be observed, know as polarized neutron scattering. The polarized neutron can be expanded to...
A better theoretical understanding of the quantum mechanical processes in spin filter for the separation of metastable hydrogen atoms in individual hyperfine substates enables a number of new applications. For example, it is now possible to build a new generation of Lamb-shift polarimeter that can separate not only α but also the β states with $m_J = -1/2$. This opens up completely new...
I will present an overview of our activities on the study of the three-nucleon force using a polarized deuteron beam and a polarized proton target at RIKEN, with particular focus on the polarized proton target. We have developed the target system based on Dynamic Nuclear Polarization with photoexcited triplet electrons (Triplet-DNP), operating at 0.4 T and room temperature. Low-field operation...
we propose a novel approach to measure the final-state proton polarization in large-acceptance collider experiments. Using existing tracking devices and supporting structure material, general-purpose spectrometers can be utilized as a large-acceptance polarimeter without hardware upgrade. This approach is tested at BESIII, and can be applied at nearly all major facilities, such as Belle-II,...
Nuclear spin polarization has important applications across various fields, including physics and medicine. It also offers several advantages, such as cross-section enhancement, in the five-nucleon fusion reactions, namely the D-T and D-$^3$He reactions. This work presents a theoretical study of spin dynamics in the hyperfine regime for selected atomic and molecular systems and explores...
The development of polarized neutron technology is pivotal for advancing studies in material science and fundamental physics, particularly in probing magnetic structures and symmetry violations. At the China Spallation Neutron Source (CSNS), significant progress has been made in the design and implementation of polarized 3He neutron spin filters (NSFs) based on spin-exchange optical pumping...
The SpinQuest experiment leverages a transversely polarized solid-state target to investigate the orbital angular momentum of the nucleon by probing sea quarks through the Drell-Yan process, enabling a measurement of the Sivers asymmetry. The Drell–Yan process is initiated by Fermilab’s 120 GeV Main Injector proton beam, delivering intensities of up to 3E12 protons per 4-second spill. The...
The PREFER (Polarization REsearch for Fusion Experiments and Reactors) collaboration aims to address the know-hows in different fields and techniques to the challenging bet on energy production by nuclear fusion with polarized fuel. The collaboration involves different institutions and researchers, sharing skills and peculiar abilities, having then possibilities to...
Proton-boron (p-¹¹B) fusion is widely recognized as a promising candidate for future clean energy due to its advantages of abundant fuel, inherent safety, and minimal neutron emissions. However, the practical realization of p-¹¹B fusion faces significant challenges, primarily due to its stringent ignition conditions and relatively low reaction cross-section. Recently, spin polarization has...
In the selection of fusion fuels, proton and boron-11 as an ideal choice for commercialization due to its abundant raw materials and the absence of neutron production in the reaction. Compared with other fusion fuels, the proton-boron reaction has a smaller cross-section and requires a higher ignition temperature. To address or mitigate the impact of these difficulties, it is necessary to...
