Sep 8 – 14, 2019
Toyama International Conference Center
Japan timezone

Studies on liquid argon S1 and S2 properties for low mass WIMP search experiments

Sep 12, 2019, 2:20 PM
202 (Toyama International Conference Center)


Toyama International Conference Center
Oral presentation in parallel session Dark matter DM16: Backgrounds in Dark Matter Experiments II


Masashi Tanaka (Waseda)


Liquid argon is known as an excellent target material for WIMP dark matter direct search experiment. Relatively small atomic mass (A=40) gives high nuclear recoil energy for WIMP-Ar nuclear scattering, thus it potentially has high sensitivity for low mass WIMP (<10 GeV/$c^{2}$) . There are two crucial R&D topics for the liquid argon detector to explore such low mass WIMP signal, namely, deep understanding the liquid argon scintillation and ionization process for low energy deposition (~10 keV) , and increasing the signal light yield by improving the argon scintillation light collection efficiency. In this presentation, we report recent results from Waseda university liquid argon test stand, new measurement of the argon scintillation and ionization efficiency for nuclear recoil under high drift field up to 3 kV/cm, understanding of the secondary scintillation light at low extraction field, and effort to improve the light collection efficiency which leads the world highest level of light yield ( ~11 pes/keVee).

Primary author

Masashi Tanaka (Waseda)


Mr Kazutaka Aoyama (Waseda Univ.) Dr Kohei Yorita (Waseda University) Mr Masato Kimura (Waseda University)

Presentation materials