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

A measurement of the scintillation decay time constant in liquid xenon with the XMASS-I detector

Sep 11, 2019, 3:50 PM
20m
205 (Toyama International Conference Center)

205

Toyama International Conference Center

taup2019-sec@km.icrr.u-tokyo.ac.jp
Oral presentation in parallel session New technologies New Technology #3

Speaker

Dr Koichi Ichimura (Kamioka Observatory, ICRR, the University of Tokyo)

Description

Liquid xenon has been used in many modern experiments. The scintillation light of xenon is produced by the de-excitation of dimer state Xe$_{2}^{*}$. The dimer is produced by the direct excitation of xenon atoms or the recombination process between electrons and xenon ions. The dimer has both a singlet and triplet state, each with its own decay time constant. Since the ratio of the singlet to triplet states and the recombination time depends on the deposit energy density, the scintillation decay constant information can be used for particle discrimination between nuclear recoil and electron recoil. XMASS-I experiment is a single phase liquid xenon detector primarily for dark matter search. We measured the scintillation decay time constant of both electron recoil and nuclear recoil using calibration sources irradiating the XMASS-I detector. In this talk, we will present the result of the measurement of the scintillation decay time constant with XMASS-I detector.

Primary author

Dr Koichi Ichimura (Kamioka Observatory, ICRR, the University of Tokyo)

Presentation materials