Author/Authors :
Matsubara، نويسنده , , T. and Haruna، نويسنده , , T. and Konno، نويسنده , , T. and Endo، نويسنده , , Y. and Bongrand، نويسنده , , M. and Furuta، نويسنده , , H. and Hara، نويسنده , , T. and Ishitsuka، نويسنده , , M. and Kawasaki، نويسنده , , T. and Kuze، نويسنده , , M. and Maeda، نويسنده , , J. and Mishina، نويسنده , , Y. and Miyamoto، نويسنده , , Y. and Miyata، نويسنده , , H. and Nagasaka، نويسنده , , Y. and Sakamoto، نويسنده , , Y. and Sato، نويسنده , , F. and Shigemori، نويسنده , , A. and Suekane، نويسنده , , F. and Sumiyoshi، نويسنده , , T. and Tabata، نويسنده , , H. and Tamura، نويسنده , , N.، نويسنده ,
Abstract :
The Double Chooz is a reactor neutrino experiment which measures the last unknown neutrino mixing angle θ 13 . The Double Chooz experiment uses two identical detectors placed at sites far and near from Chooz reactor cores. The detector uses 390 low-background and high performance 10-in. Photo-Multiplier Tubes (PMTs) to detect scintillation light from gadolinium loaded liquid scintillator. In order to test and characterize the PMTs and to tune operation parameter, we developed two types of PMT test system and evaluated 400 PMTs before installation. Those PMTs fulfilled our requirements and half of them were installed in the far detector in 2009 and physics data have been successfully taken since 2011.
Keywords :
Reactor , Theta-13 , Oscillation , low radioactivity , PMT , Neutrino
