Report on the Depth Requirements for a Massive Detector at Homestake

Understand

This report provides the technical justification for locating a large detector underground in a US based Deep Underground Science and Engineering Laboratory.

• A large detector with a fiducial mass in the mega-ton scale will most likely be a multipurpose facility.
• The main physics justification for such a device is detection of accelerator generated neutrinos, nucleon decay, and natural sources of neutrinos such as solar, atmospheric and supernova neutrinos.
• In addition to the physics justification there are practical issues regarding the existing infrastructure at Homestake, and the stress characteristics of the Homestake rock formations.