205 research outputs found
Evidence of a two-source emission for light charged particles in coincidence with pions produced in 16O+27Al collisions at 94 MeV/nucleon
No full textA dual threshold technique to improve the time resolution of resistive plate chambers in streamer mode
No full textThe trigger setup of the dimuon arm of ALICE, the dedicated Heavy-Ion Experiment at LHC, is based on Resistive Plate Chambers (RPCs). This gaseous detector can be operated either in streamer or in avalanche mode, each mode having its own advantages and drawbacks. Using conventional discrimination techniques, like single threshold or constant fraction discriminator, the time resolution is better in avalanche mode (commonly 1 ns) unless the RPC is operated in streamer mode at quite high running voltages which is not suitable. Since we propose to operate the RPCs in streamer mode in ALICE, we have studied a new discrimination technique in order to improve the time resolution in this mode. With this method, a comparable timing quality as one of the avalanche modes is typically obtained, as soon as the applied voltage is sufficient for the RPC to reach the full efficiency. This is an important progress not only for the ALICE trigger but also because the RPC detector is widely used in streamer mode. (C) 2001 Elsevier Science B.V. All rights reserved
Light fragment emission correlated with large transverse momentum protons in 94 MeV/u 16O induced reactions
No full textSpatial resolution of RPC in streamer mode
No full textIn the framework of an R&D program on the ALICE dimuon trigger system, the spatial resolution of Resistive Plate Chambers working in streamer mode has been investigated during beam tests. Preliminary studies with cosmic rays had evidenced a dependence of the charge profile to the high voltage and to the gas mixture. However, the spatial resolution measured from the beam tests is only slightly varying with the high voltage and is close to the expected value w/root12 where w is the strip pitch, for strips of 1 and 2 cm width. The probability to fire a strip as a function of the distance from the strip to the particle impact has been measured for various high voltages. A simple parametrisation of this probability has been achieved. This allows to predict, under various working condition, the cluster size distributions for RPCs with different strip widths and also to account for the effect of the particle incident angle. (C) 2002 Elsevier Science B.V. All rights reserved
Etude du F par diffusion de protons de 30 MeV - Determination des deformations statiques du F Ne Ne
No full text
Evolution of the multifragment emission regime between 3 and 5.5 MeV/u excitation energy
No full textEvolution of the multifragment emission regime between 3 and 5.5 MeV/u excitation energy
No full text
- …
