Results from the NEXT prototypes

6th Symposium on Large TPCs for Low Energy Rare Event Detection

Oliveira, C.A.B.^1

Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, United States^1

关键词: Double beta decay;    Energy resolutions;    Full width half maximum;    Intrinsic energy resolution;    Light collection;    Operational conditions;    Tracking capability;    Underground laboratory;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/460/1/012011/pdf
DOI  :  10.1088/1742-6596/460/1/012011

来源: IOP

【 摘 要 】

NEXT-100 is an electroluminescent high pressure Time Projection Chamber currently under construction. It will search for the neutrino-less double beta decay in136Xe at the Canfranc Underground Laboratory. NEXT-100 aims to achieve nearly intrinsic energy resolution and to highly suppress background events by taking advantage of the unique properties of xenon in the gaseous phase as the detection medium. In order to prove the principle of operation and to study which are the best operational conditions, two prototypes were constructed: NEXT-DEMO and NEXT-DBDM. In this paper we present the latest results from both prototypes. We report the improvement in terms of light collection (∼ 3×) achieved by coating the walls of NEXT-DEMO with tetraphenyl butadiene (TPB), the outstanding energy resolution of 1 % (Full Width Half Maximum) from NEXT-DBDM as well as the tracking capabilities of this prototype (2.1 mm RMS error for point-like depositions) achieved by using a square array of 8 × 8 SiPMs.