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The HERMES experiment

โœ Scribed by R.G. Milner

Book ID
104336502
Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
651 KB
Volume
622
Category
Article
ISSN
0375-9474

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โœฆ Synopsis

HERMES, H._EERA Measurement of Spin, is an experiment underway at DESY to study the spin structure of the nucleon by using polarized internal gas targets in the HERA 27.5 GeV electron storage ring. Inclusive and semi-inclusive spin dependent deep inelastic scattering are simultaneously measured in a forward spectrometer. In 1995 the experiment was installed and commissioned and data were taken on a polarized 3He target as well as on unpolarized targets of hydrogen and deuterium. In this paper, several aspects of the spin structure of the nucleon which can be probed by HERMES are discussed. The experiment is briefly described and some preliminary results from 1995 running are presented.

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In spring 1998 two identical RICH detectors were installed in the HERMES spectrometer. Main features of these detectors are the use of two radiators. One of them is the silica aerogel, a solid SiO2 based compound never used before in a RICH. The photon detector is made of a matrix of 1934 3/4" PMTs.