A RICH detector for hadron identification at JLab.
The "standard" Hall A apparatus at Jefferson Lab (TOF and aerogel threshold Cherenkov detectors) does not provide complete identification for proton, kaon and pion. To this aim, a proximity focusing C(6)F(14)/CsI RICH (Ring Image CHerenkov) detector has been designed, built, tested and operated to separate kaons from pions with a pion contamination of a few percent up to 2.4GeV/c. Two quite different experimental investigations have benefitted of the RICH identification: on one side, the high-resolution hypernuclear spectroscopy series of experiments on carbon, beryllium and oxygen, devoted to the study of the lambda-nucleon potential. On the other side, the measurements of the single spin asymmetries of pion and kaon on a transversely polarized (3)He target are of utmost interest in understanding QCD dynamics in the nucleon. We present the technical features of such a RICH detector and comment on the presently achieved performance in hadron identification.
Dipartimento di Fisica ed Astronomia, Università di Catania, via Santa Sofia 64, I-95123 Catania, Italy. francesco.mammoliti@ct.infn.it
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Mammoliti
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Bellini
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Cisbani
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Cusanno
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Garibaldi
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de Jager
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Russo
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Sperduto
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Sutera
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Urciuoli
D001608:Beryllium / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D004583:Electrons; D019471:Elementary Particle Interactions; D004601:Elementary Particles; D004867:Equipment Design; D008651:Mesons; D009010:Monte Carlo Method; D009686:Nuclear Physics; D010100:Oxygen / Q000737:chemistry; D011522:Protons; D013057:Spectrum Analysis
D011522:Protons; D002244:Carbon; D001608:Beryllium; D010100:Oxygen