Elsevier

Nuclear Physics A

Volume 525, April 1991, Pages 601-604
Nuclear Physics A

Silicon ion interactions measured in the E-810 TPC at the AGS

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Abstract

The tracking detector of AGS Experiment 810 is a three-piece Time Projection Chamber (TPC) which measures all charged tracks in the forward hemisphere of the nucleon-nucleon center of mass system, i. e. forward of 20 degrees in the lab. Each module of the TPC contains twelve rows of short anode wires which give 3-D space points on each track, but no dE/dx information useable for particle identification. The MPS magnet provides a uniform 5 kG field on the TPC volume. The TPC was operated in a beam of 14.6 × A GeV/c silicon ions at the end of June 1989. This talk reports the results of analysis of the gold and copper target data from that run. The trigger was quite simple, requiring a large pulse height in a Čerenkov counter in the incident beam indicating an incident silicon ion, a small pulse height in a scintillation counter centered on the beam behind the TPC corresponding to less ionization than a surviving carbon ion would produce, and a substantial signal in each of two scintillators located above and below the beam just in front of the TPC. The targets were thin, 0.0076 radiation lengths of gold, 0.0089 radiation lengths of copper, to reduce contamination of the events by electron tracks from converted π0 photons. A cut at multiplicity 50 was used to select more central collisions, yielding 2291 events from the gold sample, 2170 from the copper. This corresponds to cross sections of 0.59 and 0.20 barns, respectively, defining the “central” sample for the charged particle distributions presented here.

References (3)

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Cited by (1)

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This research was supported by the U.S. Department of Energy under Contract Nos. DE-AC02-76CH00016, DE-AC02-83ER40107, DE-AS05-81ER40032 and DE-AC02-76ER03274, and the City University of New York PSC-BHE Research Award Program.

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