Details

Autor(en) / Beteiligte

• Kobayashi, M.
• Abe, K.
• Hiraide, K.
• Ichimura, K.
• Kishimoto, Y.
• Kobayashi, K.
• Moriyama, S.
• Nakahata, M.
• Ogawa, H.
• Sato, K.
• Sekiya, H.
• Suzuki, T.
• Takeda, A.
• Tasaka, S.
• Yamashita, M.
• Yang, B.S.
• Kim, N.Y.
• Kim, Y.D.
• Itow, Y.
• Kanzawa, K.
• Masuda, K.
• Martens, K.
• Suzuki, Y.
• Xu, B.D.
• Miuchi, K.
• Oka, N.
• Takeuchi, Y.
• Kim, Y.H.
• Lee, K.B.
• Lee, M.K.
• Fukuda, Y.
• Miyasaka, M.
• Nishijima, K.
• Fushimi, K.
• Kanzaki, G.
• Nakamura, S.

Titel

Search for sub-GeV dark matter by annual modulation using XMASS-I detector

Ist Teil von

• Physics letters. B, 2019-08, Vol.795, p.308-313

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A search for dark matter (DM) with mass in the sub-GeV region (0.32–1 GeV) was conducted by looking for an annual modulation signal in XMASS, a single-phase liquid xenon detector. Inelastic nuclear scattering accompanied by bremsstrahlung emission was used to search down to an electron equivalent energy of 1 keV. The data used had a live time of 2.8 years (3.5 years in calendar time), resulting in a total exposure of 2.38 ton-years. No significant modulation signal was observed and 90% confidence level upper limits of 1.6×10−33 cm2 at 0.5 GeV was set for the DM-nucleon cross section. This is the first experimental result of a search for DM mediated by the bremsstrahlung effect. In addition, a search for DM with mass in the multi-GeV region (4–20 GeV) was conducted with a lower energy threshold than previous analysis of XMASS. Elastic nuclear scattering was used to search down to a nuclear recoil equivalent energy of 2.3 keV, and upper limits of 2.9 ×10−42 cm2 at 8 GeV was obtained.