talk - International Workshop on Double Beta Decay and Neutrino
talk - International Workshop on Double Beta Decay and Neutrino
talk - International Workshop on Double Beta Decay and Neutrino
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Expected Background<br />
Background Event in CANDLES System<br />
Radioactive C<strong>on</strong>taminati<strong>on</strong> within CaF 2 (pure)<br />
Background process<br />
Th-Chain<br />
<br />
232<br />
Th<br />
212<br />
Bi<br />
212<br />
Po<br />
64%<br />
Q = 2.25MeV<br />
T 1/2 = 0.3sec<br />
Pile-up event<br />
(Sequential event)<br />
because . . .<br />
CaF 2 (pure) :<br />
time c<strong>on</strong>stant ~1s<br />
<br />
208<br />
Pb<br />
stable<br />
Q = 8.95MeV<br />
E max = 5.3MeV<br />
(Q = 4.27MeV)<br />
To reject as the sequential event (background event)<br />
・identify the “pile-up” shape<br />
・ rays particle identificati<strong>on</strong><br />
UMEHARA Saori, 16 th Nov. 2011, DBD11
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