Performance study of scintillating fiber detectors for the HypHI project

Hypernuclei spectroscopy has been investigated by means of meson- or electron-beam induced reaction with a target material of stable nuclei in most of experiments. Consequently all existing methods are restricted to the production of hypernuclei close to the valley of stability. The HypHI project at GSI and FAIR aims to produce hypernuclei by stable and unstable heavy ion induced reactions, which is the only way to produce hypernuclei at extreme isospins and to measure directly hypernuclear magnetic moments for the first time. The first HypHI experiment defined as Phase 0 has been proposed to demonstrate the feasibility of the experimental principle by producing and identifying 3ΛH, 4ΛH and 5ΛHe by reconstructing their invariant masses with 6Li projectile at 2 A GeV impinging on a 12C target. The proposed experimental setup consists of the ALADIN dipole magnet, three layers of scintillating fiber detector, two Time-Of-Flight (TOF) walls, a diamond detector, a K+ detector and two sets of drift chambers.Three layers of scintillating fiber detectors will be placed just behind the target, and used for tracking charged particle and for the measurement of decay vertices. Prototypes of scintillating fiber detectors have been tested with cosmic-rays, 90Sr beta sources and beams of the GSI SIS18 accelerator. In the presentation, the performance of the scintillating fiber detectors is discussed