High Energy Nuclear Physics Group

at University of Tsukuba

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PHENIX evidence of RHIC collisions recorded Thursday morning, June 15 after accelerator operators brought beams into collision in the PHENIX interaction region. Signals were recorded simultaneously in seven PHENIX detector subsystems: Zero-Degree Calorimeters (ZDC), Beam-Beam Counters (BBC), Time-of -Flight Detectors, Pad-Chambers, Drift Chambers, Time Expansion Chambers, and Electromagnetic Calorimeters (EMCal). The event display (upper right) shows reconstructed tracks pointing to the collision. The BBC (upper left) confirms that the collision occurred near the center of the PHENIX detector system. The EMCal displays (lower left) show the first measurements of transverse energy from RHIC collisions.

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