Study of dark matter and neutrino by means of thin NaI(Tl)*

The MOON/PICO-LON consists of two thin NaI(Tl) crystal is applied to search for 0$\nu\beta\beta$ decay and WIMPs dark matter. The MOON/PICOLON has great advantages to both 0 $\nu\beta\beta$ decay and WIMPs dark matter; \begin {enumerate} \item 100\% of natural abundance of odd $A$ nuclei ($^{23}$Na and $^{127}$I). \item NaI(Tl) has the good enrgy resolution. \item $^{127}$I has a low energy exited state at 57.6keV which is excited by spin-dependent interaction. \end {enumerate} The detector of two thin NaI(Tl) crystal was tested in Oto cosmo laboratory. The good energy resolution and the low back ground data will be reported.