Accession Number : AD0614890

Title :   SEARCH FOR THE DECAY MUON(+) TO E(+)+GAMMA,

Corporate Author : CHICAGO UNIV ILL ENRICO FERMI INST FOR NUCLEAR STUDIES

Personal Author(s) : Parker,Sherwood ; anderson,Herbert L. ; Rey,Charles

Report Date : 26 AUG 1963

Pagination or Media Count : 11

Abstract : A search has been conducted for the decay of muon(+) into e(+)+gamma using spark chambers, scintillators, and fast oscilloscopes. The number of stopped pions, 7.39X10 to the ninth power and the detection efficiency of the apparatus for muon to electron + gamma events, 3.9%, would predict the detection of 3 events for a branching ratio of 10 to the minus eighth power. No evidence for the existence of this decay was found. The distribution in range of the e(+) in graphite, and of the (e, to the minus eighth power) angle for the events found near 180 deg was consistent with that expected from muon(+) to position +neutrinotantineotrino+gamma. The probability of finding the observed distribution was calculated to be greatest for an assumed muon to electron+gamma branching ratio of zero. This probability drops below 50% of this value if the branching ratio is 0.6X10 to the minus eighth power, and below 10% for 2.2X10 to the minus eighth power. (Author)

Descriptors :   (*MUONS, DECAY SCHEMES), (*DECAY SCHEMES, BETA DECAY), (*GAMMA EMISSION, MUONS), POSITRONS, ELECTRONS, PIONS, PROBABILITY, SCINTILLATION COUNTERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE