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Possibility of SRN detection<br />
Relic model: S.Ando, K.Sato, and T.Totani, Astropart.Phys.18, 307(2003) with flux revise in<br />
NNN05.<br />
If invisible muon background can be reduced by neutron tagging<br />
events/10years/2MeV<br />
10<br />
9<br />
SK10 years (ε=67%)<br />
8<br />
relic+B.G.(inv.mu 1/5)<br />
7<br />
6<br />
5<br />
4<br />
3<br />
2<br />
B.G. inv.mu(1/5)<br />
1<br />
atmsph. ν – e<br />
0<br />
10 15 20 25 30 35 40 45 50<br />
Visible energy (MeV)<br />
Assuming invisible muon B.G. can<br />
be reduced by a factor of 5 by<br />
neutron tagging.<br />
Assuming 67% detection efficiency.<br />
By 10 yrs SK data,<br />
Signal: 33, B.G. 27<br />
(E vis =10-30 MeV)
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