Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....3.1069m&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
The MACRO detector has measured 809 upward through-going muons induced by neutrinos of mean energy around 50 GeV from Mar. 1989 to 19 Dec. 2000 when the acquisition was stopped. Results on neutrino oscillations are shown favoring a νµ → ντ scenario with maximal mixing and ˜m2 ˜ 2.5 · 10-3 eV2 versus either no oscillations and νµ → νsterile oscillations. 1 Neutrino measurement in MACRO and neutrino oscillation analysis The MACRO detector, located in the Gran Sasso Laboratories, has a minimum rock overburden of 3150 hg/cm2 which reduces the atmospheric muon flux by a factor of ˜ 5 · 105 . MACRO's dimensions are 76.6 m ×12 m ×9.3 m. The lower 4.8 m high part is filled with rock absorber, which sets a minimum threshold for vertical muons of 1 GeV, alternating with 10 streamer tube layers used for tracking. The upper part is open and contains electronic racks covered by 4 streamer planes. There are 2 horizontal layers of liquid scintillators, at the bottom and at the top of the lower part, and a third horizontal layer in the upper part. All vertical walls are covered by scintillators. The time information provided by scintillator counters singles out the flight direction by the time-offlight technique with a time resolution of ˜ 600 ps. About 50% of tracks cross 3 scintillator counters with consequent redundancy in time measurement. The neutrino oscillations have been studied using three neutrino event topologies in MACRO. Here we present the results of the high energy upward throughgoing events (median neutrino energy ˜ 50 GeV) (Ahlen, 1995) induced by neutrinos in the rock below the detector. The results concern the whole MACRO data set, but we stress that we are still working on a global reanalysis of the whole data set in order to reduce further our experimental error. Final results will
MACRO Collaboration
Montaruli Teresa
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