6โ€“11 Jul 2025
PALAIS DU PHARO, Marseille, France
Europe/Paris timezone

Status and Prospects of NvDEx, a Se TPC detector for 0n2b decays

Not scheduled
20m
Espace 1000

Espace 1000

Poster T03 - Neutrino Physics Poster T03

Speaker

Emilio Ciuffoli (Institute of Modern Physics, Chinese Academy of Sciences)

Description

NvDEx (No Neutrino Double beta decay Experiment) is a Se TPC detector that will be located in China Jinping Underground Laboratory (CJPL), looking for neutrinoless double beta decays. In this talk, I will present the current status of the experiment and the prospects for future developments. The first phase of the experiment will be NvDEx-100, using 100 kg of SeF$_6$: due to the large overburden (2,400 m rock) and the high Q-value of $^{82}$Se (2.996 MeV) the background rate will be very low, which ensures excellent prospects for scalability. On the other hand, since SeF$_6$ is an electronegative gas, any free electron will be captured almost immediately, and negative ions will be drifting in the chamber, which prohibits the use of traditional electron-sensing TPC detectors. For this reason, a new kind of chip has been developed: it will allow us to observe the negative ions and reconstruct the energy of the events with great precision, even without electron avalanche multiplication. A third tapeout of the chip (V2) has been produced and it's currently being tested using a prototype TPC on the surface. The tracks of alpha particles were successfully detected during the test and the equivalent noise charge was measured to be about 58e$^โˆ’$, approaching the requirement of 45e$^โˆ’$.

Authors

Emilio Ciuffoli (Institute of Modern Physics, Chinese Academy of Sciences) NvDEx Collaboration

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