Indications of neutrino oscillation in a 250 km long-baseline experiment
Indications of neutrino oscillation in a 250 km long-baseline experiment
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DOI：
10.1103/physrevlett.90.041801
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发表时间：
2003-01-31
影响因子：
8.6
通讯作者：
Zalipska, J
中科院分区：
文献类型：
--
作者：
Ahn, MH;Aoki, S;Zalipska, J
K2K实验观察到了中微子振荡的迹象：Nu(Mu)通量的减少以及能谱的扭曲。在距离中微子产生点250公里的超级神冈(SK)观测到了56个束流中微子事件，预计为80.1(-5.4)(+6.2)。29个单环类u事件被用来重建中微子能谱，它与有中微子振荡的预期谱比没有中微子振荡的谱更符合预期。在SK观测到的通量用统计涨落来解释而没有中微子振荡的概率小于1%。
The K2K experiment observes indications of neutrino oscillation: a reduction of nu(mu) flux together with a distortion of the energy spectrum. Fifty-six beam neutrino events are observed in Super-Kamiokande (SK), 250 km from the neutrino production point, with an expectation of 80.1(-5.4)(+6.2). Twenty-nine one ring mu-like events are used to reconstruct the neutrino energy spectrum, which is better matched to the expected spectrum with neutrino oscillation than without. The probability that the observed flux at SK is explained by statistical fluctuation without neutrino oscillation is less than 1%.