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  • 1
    Electronic Resource
    Electronic Resource
    The EMC effect — status and perspectives (1988)
    Springer
    The European physical journal 38 (1988), S. 317-324 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent experimental results on the EMC effect are presented. The ratios of structure functions for nuclei and deuterium measured by the two muon experiments at CERN show a clear enhancement of a few percent forx〈0.25. Atx below 0.05 substantial shadowing with littleQ 2 dependence has been observed by a dedicated low angle experiment of the EMC. No significant nuclear mass dependence ofR=αL/αT has been seen in the SLAC experiment E 140. There are several indications that theQ 2 evolution of nuclear structure functions deviates from the expectations of perturbative QCD and that the gluon distribution in nuclei is harder than in free nucleons. This is possibly caused by nucleon-nucleon correlations on the quark-gluon level. Many aspects of the EMC effect are presently being investigated by the high energy muon experiment of the NMC collaboration at CERN and a Drell-Yan experiment at FNAL. First results can be expected soon. They will help to develop a better understanding of nuclear effects in quark and gluon distributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01574555
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular flow and wall collision age distributions (2002)
    Springer
    The European physical journal 18 (2002), S. 37-49 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 47.45.Dt Free molecular flows – 51.20.+d Viscosity, diffusion, and thermal conductivity – 29.25.Pj Polarized and other targets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The use of storage cells has become a standard technique for internal gas targets in conjunction with high energy storage rings. In case of spin-polarized hydrogen and deuterium gas targets the interaction of the injected atoms with the walls of the storage cell can lead to depolarization and recombination. Thus the number of wall collisions of the atoms in the target gas is important for modeling the processes of spin relaxation and recombination. It is shown in this article that the diffusion process of rarefied gases in long tubes or storage cells can be described with the help of the one-dimensional diffusion equation. Mathematical methods are presented that allow one to calculate collision age distributions (CAD) and their moments analytically. These methods provide a better understanding of the different aspects of diffusion than Monte Carlo calculations. Additionally it is shown that measurements of the atomic density or polarization of a gas sample taken from the center of the tube allow one to determine the possible range of the corresponding density weighted average values along the tube. The calculations are applied to the storage cell geometry of the HERMES internal polarized hydrogen and deuterium gas target.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/e10053-002-0004-9
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    Paper (German National Licenses)
    Fulltext
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