The DONUT experiment has analyzed 203 neutrino interactions recorded in nuclear emulsion targets. A decay search has found evi-

The DONuT experiment collected data in 1997 and published first results in 2000 based on four observed ντ charged-current (CC) interactions. The final analysis of the data collected in the experiment is presented in this paper, based on 3.6 × 10 17 protons on target using the 800 GeV Tevatron beam at Fermilab. The number of observed ντ CC interactions is 9, from a total of 578 observed neutrino interactions. We calculated the energy-independent part of the tau-neutrino CC cross section (ν +ν), relative to the well-known νe and νµ cross sections. The ratio σ(ντ )/σ(νe,µ) was found to be 1.37±0.35±0.77. The ντ CC cross section was found to be 0.72±0.24±0.36×10 −38 cm 2 GeV −1 . Both results are in agreement with expectations from the Standard Model.

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We present preliminary results of a search for anomalously heavy isotopes of certain light elements using an eloclrostatic charged particle spectrometer in conjunction with the M_P tandem accelerator facility at the Nuclear Structare Research Laboratory of the University of Rochester. New limits for the existence of anomalous, heavy isotopes (100-10,000 amu) in ordinary, terrestrial Li, Be, B and F samples and enriched H 2, C 13, and O TM samples are reposed.

We describe the technical details and the performance of a large array which detects both the electron and muon components in extensive air showers with energies >_ 10 14 eV. The array was designed to search for-y-rays from astrophysical sources. The background of cosmic rays is reduced by the selection of moon poor events. The array consists of 1089 scintillation detectors on the surface covering an area of 0.23 km 2 and 1024 scintillation counters of 2.5 m2 each, buried 3 m below the surface for muon detection. Each of the surface detectors has its own local electronics and local data storage controlled by a microprocessor. The array is located at Dugway, Utah USA (40.2°N, 112.8°W) where the average atmospheric depth is 870 g/cm 2.

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