Accession Number : AD0647890

Title :   CERENKOV LIGHT FROM EXTENSIVE AIR SHOWERS.

Descriptive Note : Final scientific rept., 1 Jan 63-31 Dec 66,

Corporate Author : UNIVERSITY COLL DUBLIN (IRELAND) DEPT OF PHYSICS

Personal Author(s) : Porter,Neil A.

Report Date : 31 DEC 1966

Pagination or Media Count : 133

Abstract : An optical Cerenkov system has been used to set upper flux limits for gamma-rays from possible sources, in the energy region 10 to the 13th power eV. 13 possible sources were examined: the quasars 3C9, 3C48, 3C147, 3C196, 3C273, 3C286; the Crab Nebula, magnetic variables HD71866 and 53 Cam; and the Galaxies Cygnus A, M31, NGC4472 and 1607+26. The quasar results when summed show a slight positive effect; approaching significance for 3C147. Non-quasar sources showed no effect. A theory of the angular distribution of light from showers is discussed, and an image intensifier system for shower photography described. A wide-band receiver was used to detect pulses in coincidence with shower particles. The rate of pulses indicates significant decoherence at 70 Mc/s. Correlation was found between optical Cerenkov and radio pulses. Preliminary results are presented for a long distance coincidence experiment, using pure radio detection. (Author)

Descriptors :   (*COSMIC RAYS, *CERENKOV RADIATION), GAMMA RAYS, EXTRATERRESTRIAL RADIO WAVES, SOURCES, NEBULAE, VARIABLE STARS, GALAXIES, IMAGE INTENSIFIERS(ELECTRONICS), RADIO ASTRONOMY, RADIO SIGNALS, LIGHT, CORRELATION TECHNIQUES, IRELAND

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE