• Energy Research

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.

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).

In this paper we discuss the event, consisting of 5 interactions recorded during 7 seconds, detected in the Mont Blanc Underground Neutrino Observatory (UNO) on February 23, 1987. The updated pulse amplitudes, and the background imitation probability of the event are reported. It is also shown that some interactions recorded at the same time in other underground experiments, with lower detection efficiency, are consistent with the Mont Blanc event.

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].

AirCool automobile solar control coated glass was tested under desert driving conditions to determine its effect on the automobile's interior comfort and temperature. The glass was compared to standard tinted glass in side by side testing. AirCool is a stack of oxides and silver that reflects most infrared wavelengths and transmits the minimum amount of visible energy to satisfy the Federal legal requirement. Results show the AirCool glass can reduce the instrument panel temperature of a car parked in the sun by 30{sup 0}F. This coated glass also reduces the time to reach comfort (as defined by a Predicted Mean Vote value of 0) by over 30%.

Abstract The rate of muon-bursts depositing between 100 and 700 GeV of visible energy multilayer calorimeter of iron and liquid scintillattor was measured to be: R =(5.7 ± 1.5) × 10 −5 bursts/m 2 sr s kg cm −2 , while the expected rate obtained by calculation is R ′=1.7 R . These two results can be reconciled by attributing the difference to the transition effect between the iron absorber and the 7 cm thick liquid scintillators.

water is nearly opaque to infrared energy (Figure 1),the study of ocean optics has been primarily concernedwith propagation of visible energy, i.e. light. This is alsoa natural starting point for the study of ocean ecologyas photosynthesis is driven (with a few exceptions) byenergy within the visible light spectrum, which has suf-ficient energy per photon to induce photochemistry. Asphytoplankton accumulations also impact the colorand clarity of the water column, there is a direct linkbetween the studies of ocean optics and ocean ecology(Yentsch and Phinney, 1989).

Abstract Minimum masses of seven short-range, non-mesonic hyperfragments selected on the basis of high visible energy and large momentum unbalance at the decay star have been estimated from decay-star analysis. The hyperfragments are found to have masses ⪆ 25 and provide direct evidence for the existence of heavy hyperfragments. The probable masses have also been estimated from the production-star analysis assuming the validity of the spallation model for the production of such hyperfragments. The masses are found to lie in the mass range 35 ⪅ A ⪅ 85. The masses found by the two methods are not inconsistent.

The energy distribution of bright BL Lac objects is being monitored simultaneously in the IR to visible range. Results derived from spectrophotometric ( 4000 to 7400 A ) and photometric ( J,H,K and L ) observations of 16 objects, obtained in 1987 – 1988, are reported. Repeated measurements at different intensity levels were obtained for three program objects, PKS 0048-09, PKS 0422+00, and PKS 0537-44, thus allowing a preliminary discussion of the dynamical behavior of the IR to visible energy distribution.