We report recent results of a WIMP dark matter search experiment using 310g of CaF2(Eu) scintillator at Kamioka Observatory. We chose a highly radio-pure crystal, PMTs and radiation shields, so that the background rate decreased considerably. We derived limits on the spin dependent WIMP-proton and WIMP-neutron coupling coefficients, a_p and a_n. The limits excluded a part of the parameter space allowed by the annual modulation observation of the DAMA NaI experiment.
@article{arxiv.astro-ph/0510390,
title = {Dark matter search experiment with CaF2(Eu) scintillator at Kamioka Observatory},
author = {Y. Shimizu and M. Minowa and W. Suganuma and Y. Inoue},
journal= {arXiv preprint arXiv:astro-ph/0510390},
year = {2008}
}