Neutrino Physics and Astronomy with Macro

MACRO experiment operated in the Gran Sasso underground laboratory. Neutrino events collected by this detector are used in order to study the atmospheric neutrino flux. Different measurements in different energy samples are in full agreement and show evidence of neutrino oscillation phenomenon with maximal mixing and ∆m 2 ∼ 0.0025 eV 2. Also the search for neutrino astrophysical sources is reported. 1 MACRO as an atmospheric neutrino detector The MACRO detector was located in the Gran Sasso underground laboratory [1]. Thanks to its large area, fine tracking granularity and up-down symmetry, it was a proper tool for the study of upward-travelling muons and neutrino interactions in the apparatus. The different kinds of neutrino events detected by MACRO are shown in Fig. 1A : (1) upward-throughgoing muons, (2) semicontained upgoing muons, (3) upgoing stopping and (4) semicontained downgoing tracks. The sample (1) is due to more energetic neutrinos (< E ν > ∼ 50 GeV) producing muons also at long distances from the detector. The other samples are due to neutrinos of lower energy (< E ν > ∼ 4 GeV). The samples (3) and (4) are indistinguishable and therefore they are studied together (3+4). In Fig.s 1B and 2 the angular measurements are shown for samples (1), (2) and (3+4), respectively. All distributions are so far from the expectation assuming 1