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S.L. Mufson (Indiana University), MACRO Collaboration
MACRO (\underline Monopole, \underline Astrophysics, and \underline Cosmic \underline Ray \underline Observatory) is a large area multipurpose underground detector designed to search for rare events in the cosmic radiation. It has been optimized to look for supermassive magnetic monopoles as predicted by Grand Unified Theories (GUT) of the electroweak and strong interactions. Additional scientific goals of MACRO are met by analyzing other penetrating cosmic particles, such as muons and neutrinos. Among these goals are searches for cosmic sources of high energy (E\nu > 1 GeV) neutrinos and muons, indirect searches for WIMPs, the search for low energy (E\nu > 7 MeV) stellar collapse neutrinos, and investigations of various aspects of the high energy underground muon flux. MACRO has also made extensive studies of the atmospheric neutrino anomaly, which is suggestive of neutrino oscillations.
MACRO is a deep underground experiment built in a tunnel under the Gran Sasso Mountain in Italy, approximately 100 km east of Rome. The mountain serves as a filter to reject unwanted background cosmic rays, thus facilitating the detection of rare events. The detector has been built and equipped with electronics during the years 1988 - 1995. It was completed in August 1995 and since the fall of 1995 has been running in its final configuration. The MACRO detector is running smoothly. The experiment is not in a long-term running a data analysis phase.
In this talk I will discuss current analysis results from the MACRO detector, including improved limits on the monopole flux, astrophysical point sources of neutrinos and muons, and WIMPs. I will also discuss the status of the studies of atmospheric neutrinos and their implications concerning neutrino oscillations.
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