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Energy spectrum of SK-I and SK-II<br />
(>18MeV)<br />
SK-I (1496days)<br />
SK-II(791 days)<br />
90% CL limit<br />
of SRN<br />
Total<br />
background<br />
Atmospheric ν µ →<br />
invisible µ → decay e<br />
Events/4MeV<br />
Atmospheric ν µ →<br />
invisible µ → decay e<br />
Atmospheric ν e<br />
Atmospheric ν e<br />
Spallation background<br />
Energy (MeV)<br />
Observed spectrum is consistent with estimated background.<br />
Search is limited by the invisible muon background.<br />
T.iida, poster #90.5
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