Limits on the WIMP-nucleon coupling coefficients from dark matter search experiment with NaF bolometer
We have performed the underground dark matter search experiment with a sodium fluoride (NaF) bolometer array from 2002 through 2003 at Kamioka Observatory (2700 m.w.e.). The bolometer array consists of eight NaF absorbers with a total mass of 176 g, and sensitive NTD germanium thermistors glued to each of them. This experiment aims for the direct detection of weakly interacting massive particles (WIMPs) via spin-dependent interaction. With an exposure of 3.38 kg days, we derived the limits on the WIMP-nucleon coupling coefficients, ap and an. These limits confirmed and tightened those derived from our previous results with the lithium fluoride (LiF) bolometer. Our results excluded the parameter space complementary to the results obtained by Nal detectors of UKDMC experiment.