A direction-sensitive dark matter search experiment at Kamioka underground laboratory with the NEWAGE-0.3a detector was performed. The NEWAGE- 0.3a detector is a gaseous micro-time-projection chamber filled with CF4 gas at 152 Torr. The fiducial volume and target mass are 20*25*31 cm3 and 0.0115 kg, respectively. With an exposure of 0.524 kgdays, improved spin-dependent weakly interacting massive particle (WIMP)-proton cross section limits by a direction-sensitive method were achieved including a new record of 5400 pb for 150 GeV/c2 WIMPs. We studied the remaining background and found that ambient gamma-rays contributed about one-fifth of the remaining background and radioactive contaminants inside the gas chamber contributed the rest.
Cite
@article{arxiv.1002.1794,
title = {First underground results with NEWAGE-0.3a direction-sensitive dark matter detector},
author = {Kentaro Miuchi and Hironobu Nishimura and Kaori Hattori and Naoki Higashi and Chihiro Ida and Satoshi Iwaki and Shigeto Kabuki and Hidetoshi Kubo and Shunsuke Kurosawa and Kiseki Nakamura and Joseph Parker and Tatsuya Sawano and Michiaki Takahashi and Toru Tanimori and Kojiro Taniue and Kazuki Ueno and Hiroyuki Sekiya and Atsushi Takeda and Ken'ichi Tsuchiya and Atsushi Takada},
journal= {arXiv preprint arXiv:1002.1794},
year = {2015}
}
Comments
21 pages, 8 figures, to appear in Physics Letters B