A study of self-vetoing balloon vessel for liquid-scintillator detectors
نویسندگان
چکیده
KamLAND-Zen searches for neutrinoless double-beta decay with an ultra-pure liquid-scintillator (LS) filled a custom-made clean nylon balloon. The primary backgrounds are radioactive impurities such as uranium and thorium series. To reduce them, we studied self-vetoing balloon-shaped vessel future upgrade program, “KamLAND2-Zen”. We selected Polyethylene-Naphthalate (PEN) film which emit fluorescent light performed the feasibility studies. Owing to its scintillation properties, 214 Bi background could be identified in KamLAND2-Zen. Moreover, thanks different waveforms between LS PEN, can apply pulse-shape-discrimination 212 Bi-Po pileup background. evaluated rejection efficiency more than 90%. Resulting from these studies, it is possible remove restrictions on fiducial volume
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ژورنال
عنوان ژورنال: Journal of physics
سال: 2022
ISSN: ['0022-3700', '1747-3721', '0368-3508', '1747-3713']
DOI: https://doi.org/10.1088/1742-6596/2374/1/012111