SEARCH FOR PARTICLES WITH SMALL CHARGE IN COSMIC RAYS ON THE SEA LEVEL

Abstract：

In this experiment we setrched for relativistic particles with mall charge in cosmicrays by a coincident NaI(TI) counter telescope, In the telescope both NaI (TI) countersare used to measure the ionization loss of the particles in order to determine the chargeof the relativistic particles. An annular anticoinicident counter is used to reject thebackgrounds from the sides. The experimentally measured charge range is from 1/12to 1/4 electron charge The preliminary measurements give the follewing upper limitsof flux of particles with small charge in cosmic rays on the sea level, which are notwithin the core of the air shower,less than 4×10^-5 particles/.cm² ·sr·sec in the 0.08 to0.19 electron charge range and less than 2×1O^-5 particles/cm²·sr·sec in the 0.19 to 0.25electron charge range.