R&D for possible future improvements of KamLAND

Neutrino-Less Double Beta Decay and Particle Physics

“…to event topology sensit. to event topology CANDLES 29 48 Ca ---COBRA 30 116 Cd (and 130 Te) ---CUORE 31 130 Te ---DCBA 32 150 Nd ---EXO 33 136 Xe ---GERDA 34 76 Ge ---KamLAND-Zen 35 136 Xe ---LUCIFER 36 82 Se or 100 Mo or 116 Cd ---MAJORANA 37 76 Ge ---MOON 38 82 Se or 100 Mo or 150 Nd ---NEXT 39 136 Xe ---SNO+ 40 150 Nd ---SuperNEMO 41 82 Se or 150 Nd ---XMASS 42 136 Xe --- Note: * For a background of 10 −3 /keV/kg/yr; * * for a background of 10 −2 /keV/kg/yr.…”

LeptonicCPviolation

“…From the most precise 0νββ experiments, the upper bounds obtained by the Heidelberg-Moscow (Baudis et al, 1999), CUORICINO (Andreotti et al, 2011) and NEMO (Arnold et al, 2005) Collaborations, have been inferred. In the future, 0νββ experiments like GERDA (Jochum, 2010), CUORE (Andreotti et al, 2011), EXO (Gornea, 2010), MAJORANA (Gehman, 2008), SuperNEMO (Arnold et al, 2010), SNO+ (Kraus and Peeters, 2010), KamLAND-ZEN (Terashima et al, 2008), and others, will be able to probe the value of m ee down to a few 10 −2 eV. If the dominant contribution to 0νββ is due to the exchange of light active Majorana neutrinos, then m ee depends exclusively on neutrino mass and mixing parameters which enter the definition of the neutrino mass matrix m ν .…”

Low-energy neutrino physics with KamLAND

“…The obstacle of this tagging is dead time of the electronics after large μ signal. To overcome it, we developed a dead time free electronics MoGURA [14] that digitizes and buffers all the wave forms and records them when a trigger is issued. By adjusting trigger conditions, all the wave forms after μ can be recorded.…”