Final results of the MACRO experiment at Gran Sasso

by Giorgio Giacomelli (Univ. Bologna and INFN-Bologna)

Tuesday 9 Jul 2002, 16:30 → 17:30 Europe/Zurich

500/1-001 - Main Auditorium (CERN)

The MACRO experiment was a large multipurpose underground detector equipped with three independent sub-detectors: liquid scintillation counters, limited streamer tubes and nuclear track detectors. Results on several physics and astrophysics topics are presented: - Atmospheric neutrino oscillations: the data concern different event topologies with average neutrino energies of 4 and 50 GeV. Use was made of multiple Coulomb scattering to estimate the neutrino energies of events of the higher energy sample. The angular distributions, the absolute fluxes and the L/E distribution favour nu_mu -> nu_tau oscillations with maximal mixing and Delta m² = 0.0025 eV². - Search for astrophysical sources of high energy muon neutrinos and indirect search for WIMPs yielded interesting upper limits. - Search for GUT supermassive magnetic monopoles in the penetrating cosmic radiation: no candidate was found; the 90% CL upper limits are at the level of (1.5-2) x 10^-16 cm^-2 sr^-1 s^-1 for 0.0001 < beta < 1. Similar limits were obtained for nuclearites. - Cosmic Rays: seasonal and solar daily variations, sidereal anisotropies and the Moon and Sun shadows. - Composition of primary cosmic rays around the knee of the energy spectrum: coincidence data with EASTOP show a gradual increase of < In A > with energy.

Organiser(s): Jasper Kirkby / EP Division

Note: Tea & coffee will be served at 16.00 hrs.