S. Miyake

Candidate events for nucleon decay in the Kolar Gold Field experiment

Three candidate events for nucleon decay have been recorded so far in a 140 ton detector operating at a depth of 2300 m in the Kolar Gold Mines, India. It is shown that these events cannot be explained in terms of known backgrounds at such a great depth and that the observed features are consistent with those expected of nucleon decay.

Fully confined events indicative of proton decay in the Kolar Gold Fields detector

Abstract Three events have been recorded in the Kolar Gold Field experiment with tracks fully confined to the detector volume. It is shown that their characteristics are in conformity with the decay of bound nucleons and that the background due to neutrino interactions is extremely small. Based on these as well as the events reported earlier, we tentatively suggest a mean lifetime of about 7 × 10 30 yr for nucleons bound in iron nuclei.

Limits on the flux of monopoles from the Kolar gold mine experiments

Abstract A search was made for GUT monopoles in the data collected with the nucleon decay detector in the Kolar Gold Mines. The methods used are d E /d x , time of flight and catalysis of nucleon decay. A limit on the monopole flux of 2 × 10 −14 /cm 2 sec. st. for β > 10 −3 is set on the basis of this experiment.

The K.G.F. Nucleon Decay Experiment

A 140 ton nucleon decay detector is in operation in the Kolar Gold Mines in India at a depth of 2300 metres since November 1980. The experimental details, the method of analysis and the results obtained after different periods of observation are available in a series of earlier publications(1).

Proton decay experiment in the Kolar gold fields

In total 6 events of special type have been recorded as far in the Kolar Gold Fields experiment. Out of them, there events are fully confined to the detector volume. It is shown that their characteristics are in conformity with the decay of bound nucleons and the background due to neutrino interactions is extremely small. Based on these events, it is suggested that a mean lifetime of protons is about 8×1030 years.

Cosmic ray physics underground: Some puzzles

A series of experiments has been carried out since 1961 at depths of 750 to 8400 hg/cm2 in the Kolar Gold Mines and the general features of atmospheric muons and neutrinos have been studied. However, there are some prolems which are incompletely understood and some of the events observed suggest the existence of new phenomena caused by unknown particles or processes. We point out some problems observed at these great depths which are relevant to the prompt muons in hadronic collisions; the increase of average transverse momentum in the very high energy region, muon bundles, Kolar events, large electromagnetic cascades, and so on.

Nucleon Decay Experiment at Kolar Gold Fields

The Kolar Gold Field (KGF) detector has now been in operation for more than a year and some of the preliminary results have already been reported in the previous GUT workshop at Ann Arber and published [1].

The Kolar Gold Field Nucleon Decay Experiment a Status Report

A status report on the experiments now in progress at Kolar Gold Fields (KGF) is presented here with a brief description of the candidate events suggestive of nucleon decay.