نتایج جستجو برای: polarized liquid 3he
تعداد نتایج: 254475 فیلتر نتایج به سال:
We report a measurement of the asymmetry in spin-dependent quasielastic scattering of longitudinally polarized electrons from a polarized 3 ~ e gas target. The asymmetry is measured at kinematics sensitive to the transverse-longitudinal response function R T L , ( Q ~ , ~ ) . The value of the neutron electric form factor G2 (Q' =0.16 (GeVlc) 2 , = + 0.070 zk 0.100 5 0.035 is extracted from the ...
2014 We propose a new mechanism for indirect exchange in highly dense 3He adsorbed layers. This antiferromagnetic coupling arises from virtual exchange of particles between the solid layer and the liquid. It should predominate by more than one order of magnitude over the various ferromagnetic mechanisms proposed in the literature. It accounts for the sign and the order of magnitude of the Curie...
The 3He(3He, 2p)4He and 3H(3H, 2n)4He reactions are studied in a microscopic cluster model. We search for resonances in the 3He+3He and 4He+p+p channels using methods that treat the twoand three-body resonance asymptotics correctly. Our results show that the existence of a low-energy resonance or virtual state, which could influence the 7Be and 8B solar neutrino fluxes, is rather unlikely. Our ...
An experimental determination of the single-particle mean kinetic energies for 3He along the T = 2.00 K isotherm in the dense liquid and in the solid hcp and bcc phases is reported. Deep-inelastic neutron scattering measurements at exchanged wave vectors ranging from 90.0 to 140.0 A(-1) have been performed in order to evaluate, within the framework of the impulse approximation, the molar volume...
A laser-driven spin-polarized 3He2+-beam source for nuclear–physics experiments and the investigation of polarized nuclear fusion demands a high-density 3He gas-jet target. Such target requires magnetic system providing permanent homogeneous holding field spins plus set coils adjusting orientation polarization. Starting from transport vessel at maximum pressure 3 bar, helium gas is compressed s...
We demonstrate nuclear magnetic resonance (NMR) imaging of the flow and diffusion of laser-polarized xenon (129Xe) gas undergoing convection above evaporating laser-polarized liquid xenon. The large xenon NMR signal provided by the laser-polarization technique allows more rapid imaging than one can achieve with thermally polarized gas-liquid systems, permitting shorter time-scale events such as...
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