ar X iv : h ep - e x / 98 05 00 6 v 3 1 3 Ju l 1 99 8 Study of the atmospheric neutrino flux in the multi - GeV energy range
نویسندگان
چکیده
The flavor ratio of the atmospheric neutrino flux and its zenith angle dependence have been studied in the multi-GeV energy range using an exposure of 25.5 kiloton-years of the Super-Kamiokande detector. By comparing the data to a detailed Monte Carlo simulation, the ratio (µ/e) DAT A /(µ/e) MC was measured to be 0.66 ± 0.06(stat.) ± 0.08(sys.). In addition, a strong distortion in the shape of the µ-like event zenith angle distribution was observed. The ratio of the number of upward to downward µ-like events was found to be 0.52 +0.07 −0.06 (stat.) ± 0.01(sys.), with an expected value of 0.98 ± 0.03(stat.) ± 0.02(sys.), while the same ratio for the e-like events was consistent with unity.
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