Anisotropía sideral en los rayos cósmicos de alta energía

I. ESCOBAR , N. NERURKAR , R. WEIL

Resumen


A NEW TYPE OF CONNECTION OF THE TWO HALVES OF A 4- GAS-FLOW GEIGER COUNTER IS PRESENTED, IN WICH ONLY PULSES OCCURRING IN ONE HALF ARE COUNTED, COINCIDENCES BETWEEN THE TWO HALVES BEING ELIMINATED AS DUE TO COSMIC-RAY BACKGROUND. THIS WAY EACH HALF SERVES AS COINCIDENCE-PROTECTION COUNTER FOR THE OTHER, WHILE CONTRIBUTING TO THE SAMPLE COUNT. BACKGRONUDS ARE DOWN TO ABOUT 25 PPM IN A 4” LEAD SHIELD, WHILE COUNTIG EFFICIENCY REMAINS PRACTICALLY EQUAL TO 100%. MICROMCROCURIE ACTIVITIES CAN BE COUNTED, USING ONLY VERY LITTLE EQUIPMENT.

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