The Homestake Large Area Scintillation Detector and cosmic ray telescope

The Homestake Large Area Scintillation Detector consists of 140 tons of liquid scintillator in a hollow 8 m×8 m×16 m box surrounding the Brookhaven 37Cl solar neutrino detector. The experiment is located at a depth of 4850 ft. (4200 m.w.e.) in the Homestake Gold Mine. Half of the detector is currently running; the full detector will be taking data early in 1985. An extensive air shower array is also currently under construction on the earth’s surface above the underground chamber, consisting of 100 scintillators, each 3 m2, covering approximately 0.8 km2; the first portion of the surface array will also be providing data in early 1985. Together, the new Homestake detectors (Fig. 1) will be used to search for slow, massive magnetic monopoles; study the zenith angle distribution of neutrino‐induced muons; search for neutrino bursts from the gravitational collapse of massive stars; measure the multiplicity and transverse momentum distributions of cosmic ray muons; and study the composition of the primary cos...