Speaker
Masashi Tanaka
(Waseda)
Description
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)
Co-authors
Mr
Kazutaka Aoyama
(Waseda Univ.)
Dr
Kohei Yorita
(Waseda University)
Mr
Masato Kimura
(Waseda University)
