Abstract
The new physics opened by the J /~ discovery has revived a great interest in the identification of K-mesons associated with high-energy processes. For example, even a poor 7~/K separation by time of flight was sufficient for the SLAC/LBL experiment at SPEAR to discover new charmed mesons. On the contrary, the problem of particle identification is far from being satisfactorily solved. This is true, in particular, for experiments to be performed in colliding-beam machines (ISR, PEP, PETRA) where the standard techniques, such as high-pressure ~erenkov counters, present big problems because of the momentum range to be investigated and the large solid angle which has to be covered by the detcctor. The developmcnt of silica aerogel (*) as a ~erenkov radiator (~) with refractive indexes in the range 1.01 to 1.07 is of great interest as a possible way out of the problem of particle identification in the low-monlentum range ((1--3.5)GeV/c). We have built a few silica aerogel samples in order to study the problem encountered in the preparation of this material, and we have tested one sample in a variable-momentum beam in order to investigate its properties as a suitable (~erenkov radiator. The results of this test are reported bclnw.
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