SPARK CHAMBER RECORDING EFFICIENCY FOR CHARGED PARTICLE SHOWERS (in Russian)
Two neon-filled 600 x 600 mm spark chambers with 70and 90-mm distances between electrodes and a two-millimeter duraluminum electrode between them were used for determining the efficiency of a two-electrode spark detector. A 2-cm layer of lead over the chambers generated cosmic electron showers. A plastic scintillator with a FEU-33 photomultiplier was placed under the chambers. Chamber recording efficiencies for showers (q) and for separate particles in a shower (Q) were recorded. The magnitude q was recorded as the ratio of the number of showers recorded simultaneously in both chambers to the total number of showers recorded in one chamber. The shower recording efficiencies were: q/sub 1/ = 0.95 plus or minus 0.05 and q/sub 2/ = 0.94 plus or minus 0.05 (for electrode distances of 90 and 70 mm, respectively). The magnitude of Q was evaluated as the ratio of recorded particles to the total number of particle passing through an effective area at <40 deg angle. The values were B/sub 1/ = 0.78 plus or minus 0.06 and Q/sub 2/ = 0.73 plus or minus 0.17 at mean particle numbers N/sub 1/ = 18.6 plus or minus 2.1 and N/sub 2/ = 20.0 plus or minus 5.7. The shower efficiency plotted as a function of the number of passing particles showed that within statistical error the magnitude does not fluctuate. Data processed without sparks found away from the shower axis showed Q/sub 1/ = 0.92 plus or minus 0.07, which did not vary for a month. (R.V.J.)
- Research Organization:
- Lebedev Inst. of Physics, Moscow
- NSA Number:
- NSA-18-008684
- OSTI ID:
- 4096814
- Journal Information:
- Zh. Eksperim. i Teor. Fiz., Journal Name: Zh. Eksperim. i Teor. Fiz. Vol. Vol: 45
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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