Model polarisation potentials for use in calculating positron-molecule cross sections are often based on approximations in which terms that depend on the sign of the charge of the projectile are neglected. Thus, these potentials do not fully distinguish between electron and positron scattering. The validity of using such potentials for positronH2 collisions is investigated by performing scatter...

For the performance of an electron positron storage ring it is important that the beam orbit passes well centred through the quadrupole magnets. Beam position monitors (BPM) aligned relative to the magnets can still have a residual mechanical or electronical offset with respect to the magnetic axis. A beam-based method is used at LEP to measure these offsets. During the machine operation for ph...

The zero-field μSR technique is employed to study the magnetic properties of the nonsuperconducting borocarbides Sm1−xLuxNi2B2C (x = 0.0, 0.2) and NdPt1.5Au0.6B2C. Coherent ordering of the Sm electronic moments appears below TN = 9.86(3) and 4.15(3) K for the x = 0.0 and 0.2 compositions, respectively. No long range order of the Nd moments is found in NdPt1.5Au0.6B2C down to 80 mK. Freezing of ...

Proximity exchange interaction between graphene electrons and nearby magnetic insulators paves the way to create spin-polarised currents for spintronics applications. Different ferro- ferrimagnetic insulators, such as europium chalcogenides, yttrium iron garnet cobalt ferrite, have been proposed in literature induce correlations graphene. We theoretically study electronic transport properties o...

s of Workshop Presentations Ultrafast and Gigantic Spin Injection in Semiconductor M. Battiato*, K. Held Institute of Solid State Physics, TU Wien, Vienna, 1040, Austria *[email protected] The injection of spin currents in semiconductors is one of the big challenges of spintronics. Motivated by the ultrafast demagnetisation and spin injection into metals, we propose an alternative...

There is no theoretical reason to think that the spin-flip component of the Pomeron is zero. One can measure the spin-flip part using Coulomb-nuclear interference (CNI). Perturbative QCD calculations show that the spin-flip component is sensitive to the smallest quark separation in the proton, while the non-flip part probes the largest separation. According to HERA results on the proton structu...