Slow Neutron Polarization by Longitudinally Polarized Proton Filter

Abstract

We present the results of an investigation, both theoretical and experimental, of partially occupied and unoccupied electronic distributions in orthorhombic Al 2 Ru. The occupied Al states near E F are p-d hybridized in interaction with Ru 4d states, whereas they are almost purely s-like in character beyond 6 eV from E F . The Ru 4d states are found close to E F ; their interaction with the Al states produces an important depletion of the Al 3s-d and Al 3p distributions. As a result, the Al edges are somewhat pushed back from E F . Thus a wide range of energy with almost no states is present in the occupied band side. E F lies close to the bottom of the unoccupied band where both unoccupied Al states and unoccupied Ru states are present. These results are compared to previous data for icosahedral quasicrystalline Al 70.5 Pd 21 Re 8.5 .

Current activities and plans for polarized neutron instruments of the JSNS/J-PARC project

“…At KEK, Ishimoto et al [4] and Masuda et al [6] developed such a kind of technique [4,5], and used it for fundamental physics experiments, studying parity non-conservation phenomena. It had been routinely operated for more than 10 years.…”

“…Fig. 6 shows the cryomagnet for the setup, which can produce a 2.5 T magnetic-field at 0.5 K. The temperature is obtained by a two-stage cooling circuit: 4 He pumping to get down to 1.2 K, and additional 3 He pumping to 0.5 K. The filter consists of ethylene glycol doped with Cr 5+ , which act as paramagnetic centers. The electron spin of the paramagnetic centers is transferred to protonnuclear spins by the help of microwaves of 40-80 mW.…”

Development on Dynamic Nuclear Polarized Targets

“…The DNP proton targets have been used to polarize low-energy neutron beams since 1964 [57,58,26]. A polarized proton target is the most efficient way to filter the spin of epithermal neutrons (see Ref.…”

Proton polarization with p-terphenyl crystal by integrated solid effect on photoexcited triplet state

“…For studying magnetically ordered nuclear spins in sold state physics [1], or utilizing as a polarized solid target in particle and nuclear physics [3,4], the technique has been applied to various types of solid. Recently, by efforts of many researchers on quantum computation using nuclear magnetic resonance (NMR), the DNP is attracting attention as a method for improvement of NMR sensitivity in multi-qubits system [5,6].…”