Showing papers by "W. Meyer published in 2008"
TL;DR: The semi-inclusive difference asymmetry for hadrons of opposite charge has been measured by the COMPASS experiment at CERN as discussed by the authors, where the first moment of Δ u v + Δ d v was found to be equal to 0.40 ± 0.07 (stat. ) ±0.06 ( syst. ) over the measured range of x at Q 2 = 10 ( GeV / c ) 2.
77 citations
TL;DR: In this paper, the authors used systematical electron spin resonance (ESR) investigations in order to study the properties of the paramagnetic dopants (i.e., their ESR line width) to yield alcohol and diol materials with deuteron polarizations as high as 80%.
Abstract: Polarized solid targets have been used in nuclear and particle physics experiments since the early 1960s, and with the development of superconducting magnets and 3He/4He dilution refrigerators in the early 1970s, proton polarization values of 80–100% have been achieved routinely in various target materials at two standard magnetic field and temperature conditions (2.5 T, <0.3 K and 5 T, 1 K). Due to the much lower magnetic moment of the deuteron compared with that of the proton, deuteron polarization values have been considerably lower, typically 30–40% in chemically doped alcohols (d-butanol), 40–45% in radiation-doped ammonia (ND3), and 50–55% in irradiated lithium-deuteride. Now, however, research at the University of Bochum – including systematical electron spin resonance (ESR) investigations in order to study the properties of the paramagnetic dopants (i.e., their ESR line width) – is yielding alcohol and diol materials with deuteron polarizations as high as 80%.
4 citations
07 Feb 2008
TL;DR: The COMPASS experiment has been taking data since 2002 and its polarized target was upgraded during the 2005 CERN SPS shutdown as discussed by the authors, achieving +56.0% and −53.5% deuteron polarization in 6LiD.
Abstract: The COMPASS experiment has been taking data since 2002. Its polarized target was upgraded during the 2005 CERN SPS shutdown. With the high acceptance magnet we obtained +56.0% and −53.0% deuteron polarization in 6LiD. In 2007 ammonia is used as a proton target which has a relaxation time of ∼4000 h at 0.6 T.
3 citations