Tensor polarization of deuterons passing through matter

Abstract

It is shown that the magnitude of tensor polarization of the deuteron beam, which arises owing to the spin dichroism effect, depends appreciably on the angular width of the detector that registers the deuterons transmitted through the target. Even when the angular width of the detector is much smaller than the mean square angle of multiple Coulomb scattering, the beam's tensor polarization depends noticeably on rescattering. When the angular width of the detector is much larger than the mean square angle of multiple Coulomb scattering (as well as than the characteristic angle of elastic nuclear scattering), tensor polarization is determined only by the total reaction cross sections for deuteron-nucleus interaction, and elastic scattering processes make no contribution to tensor polarization.

Electromagnetic dipole moment and time reversal invariance violating interactions of high energy short-lived particles in bent and straight crystals

“…where R nuc is the radius of nucleus, J 1 is the Bessel function of the first order. From (21) it follows that for scattering angles ϑ ≤ 1 kRnuc the imaginary part of scattering amplitude A ′′ s ≈ kR 2 nuc . The real part of Coulomb amplitude A ′ coul = Zα kϑ 2 becomes comparable or even greater than A ′′ s for scattering angles ϑ ≤ √ Zα kRnuc .…”

“…This necessitates to average the spin-dependent parameters of the particle over phase space of the particle beam. That is why one should always bear in mind the distinction between beam polarization ξ and spin vector S. Complete description of particle spin motion can be made by the use of spin density matrices equation (in more details see [10,21]). For the case of ultra relativistic baryons with spin S = 1/2 the T-BMT equations supplied with the term, which is responsible for interaction between particle EDM and electric field, can be written as follows (γ ≫ 1, γ is the Lorentz-factor) [1,2,22,23]:…”

Short intense ion pulses for materials and warm dense matter research

“…The peak near 400 nm is attributed to a convolution of the broad emission peak due to the df transition in Ce 3+ [Ba91] with the wavelength cut-off of the optical fiber at 400 nm. Separately, analysing the emission near 400 and 440 nm we find exponential decay constants of 30 and 24 ns, respectively, similar to photon luminescence results for YAP [Ba91,Le95,De00]. This structure will be explored in future experiments in relation to earlier observations of excitation specific emission structures from luminescent materials [To13].…”

Kinetics of polarization in non-relativistic scattering

“…The same kinetic equation was later re-derived in Ref. [9] and applied to the analysis of the spin evolution, see also [10,11].…”