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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Physik mit schweren Ionen

HK 20.7: Talk

Tuesday, March 11, 2008, 10:15–10:30, 2E

Performance of TOF wall for positively charged particles for HypHI experiment — •Olga Borodina for the HypHI collaboration — GSI Darmstadt, Germany

The HypHI project aims to study hypernuclei at extreme isospins and to measure directly hypernuclear magnetic moments for the first time. The first experiment aims to demonstrate the feasibility of hypernuclear spectroscopy with heavy ion beams by producing and identifying hydrogen and helium hypernuclei with a Li beam at 2 A GeV impinged on a ¹²C target. The most promising signals of hypernuclei in the experiment is the existence of a secondary decay vertex well behind the target, which can be identified via measurements of π⁻ channels of the mesonic decay of hypernuclei of interest. Three layers of scintillating fiber detectors mounted in front of a large dipole magnet, ALADiN, will be used for tracking particles to reconstruct secondary decay vertices. Behind ALADiN there are two Time Of Flight (TOF) walls which can also measure positions of registered particles. One of the TOF walls so called the ALADiN TOF walls already exists and will be used to measure π⁻, and the other TOF wall, TOF+, for positively charged particles is under construction. Prototypes of TOF+ wall have been already tested with cosmic rays and light beam fragments produced by ⁵⁸Ni and ¹²C beams impinged on a carbon target. In the presentation, the performance of the TOF+ wall will be discussed. The expected result in the Phase 0 experiment by taking the result of the prototype study into account will be also discussed with Monte Carlo simulations.