TY  - JOUR
AU  - NEXT Collaboration (Cebrian, S. et al
AU  - Alvarez, V.
AU  - Carcel, S.
AU  - Cervera-Villanueva, A.
AU  - Diaz, J.
AU  - Ferrario, P.
AU  - Gomez-Cadenas, J. J.
AU  - Laing, A.
AU  - Liubarsky, I.
AU  - Lopez-March, N.
AU  - Lorca, D.
AU  - Martin-Albo, J.
AU  - Martinez, A.
AU  - Monrabal, F.
AU  - Monserrate, M.
AU  - Muñoz Vidal, J.
AU  - Nebot-Guinot, M.
AU  - Rodriguez, J.
AU  - Serra, L.
AU  - Simon, A.
AU  - Sorel, M.
AU  - Yahlali, N.
PY  - 2015
DA  - 2015//
TI  - Accurate gamma and MeV-electron track reconstruction with an ultra-low diffusion Xenon/TMA TPC at 10 atm
T2  - Nucl. Instrum. Methods Phys. Res. A
JO  - Nuclear Instruments & Methods in Physics Research A
SP  - 8
EP  - 24
VL  - 804
PB  - Elsevier Science Bv
KW  - Double-beta decay
KW  - Gamma and electron detection
KW  - Microbulk micromegas
KW  - Time projection chamber
KW  - High pressure Xenon-Trimehylamine
KW  - Penning-Fluorescent mixtures
AB  - We report the performance of a 10 atm Xenon/trimethylamine time projection chamber (TPC) for the detection of X-rays (30 keV) and gamma-rays (0.511-1.275 MeV) in conjunction with the accurate tracking of the associated electrons. When operated at such a high pressure and in similar to 1%-admixtures, trimethylamine (TMA) endows Xenon with an extremely low electron diffusion (1.3 +/- 0.13 mm-sigma (longitudinal), 0.95 +/- 0.20 mm-sigma (transverse) along 1 m drift) besides forming a convenient Penning-Fluorescent' mixture. The TPC, that houses 1.1 kg of gas in its fiducial volume, operated continuously for 100 live-days in charge amplification mode. The readout was performed through the recently introduced microbulk Micromegas technology and the AFTER chip, providing a 3D voxelization of 8 mm x 8 mm x 1.2 mm for approximately 10 cm/MeV-long electron tracks. Resolution in energy (epsilon) at full width half maximum (R) inside the fiducial volume ranged from R = 14.6% (30 keV) to R = 4.6% (1.275 MeV). This work was developed as part of the R&D program of the NEXT collaboration for future detector upgrades in the search of the neutrino-less double beta decay (beta beta 0 nu) in Xe-136, specifically those based on novel gas mixtures. Therefore we ultimately focus on the calorimetric and topological properties of the reconstructed MeV-electron tracks. In particular, the obtained energy resolution has been decomposed in its various contributions and improvements towards achieving the R =1.4%root MeV/epsilon levels obtained in small sensors are discussed.
SN  - 0168-9002
UR  - http://arxiv.org/abs/1504.03678
UR  - https://doi.org/10.1016/j.nima.2015.08.033
DO  - 10.1016/j.nima.2015.08.033
LA  - English
N1  - WOS:000364133700002
ID  - NEXTCollaborationCebrian_etal2015
ER  -