Feb 15 – 19, 2016
Vienna University of Technology
Europe/Vienna timezone

Status of production for KamLAND-Zen 800 kg phase

Not scheduled
Vienna University of Technology

Vienna University of Technology

Gusshausstraße 27-29, 1040 Wien
Board: 9
Poster Astroparticle Detectors


OBARA shuhei (Tohoku University)


KamLAND-Zen is an experiment for neutrinoless double beta decay search with xenon 136 based on large liquid scintillator detector KamLAND. In order to reduce the cosmogenic isotopes and environmental radio-activities (Uranium, Thorium Potassium), KamLAND-Zen set 16.5m$^{3}$ xenon loaded scintillator in 25 $\mu$m thickness and 3.16 m diameter nylon balloon. First phase of the experiment (KamLAND-Zen 400, 400 kg xenon gas) released a lower limit for the neutrinoless double beta decay half-life. But sensitivity is restricted by the contamination of balloon (mini-balloon) which is introduced by construction. Then KamLAND-Zen collaboration planed to upgrade the detector especially for the new mini-balloon which can contain 800 kg xenon gas with 31.4m$^{3}$ liquid scintillator in 3.84 m diameter (KamLAND-Zen 800). We present the current status of KamLAND-Zen 800, new mini-balloon construction and methods to avoid the background contaminations.

Primary author

OBARA shuhei (Tohoku University)


Yoshihito Gando (Tohoku Univ.)

Presentation materials