%0 Journal Article
%T Accurate gamma and MeV-electron track reconstruction with an ultra-low diffusion Xenon/TMA TPC at 10 atm
%A NEXT Collaboration (Cebrian, S. et al
%A Alvarez, V.
%A Carcel, S.
%A Cervera-Villanueva, A.
%A Diaz, J.
%A Ferrario, P.
%A Gomez-Cadenas, J. J.
%A Laing, A.
%A Liubarsky, I.
%A Lopez-March, N.
%A Lorca, D.
%A Martin-Albo, J.
%A Martinez, A.
%A Monrabal, F.
%A Monserrate, M.
%A Muñoz Vidal, J.
%A Nebot-Guinot, M.
%A Rodriguez, J.
%A Serra, L.
%A Simon, A.
%A Sorel, M.
%A Yahlali, N.
%J Nuclear Instruments & Methods in Physics Research A
%D 2015
%V 804
%I Elsevier Science Bv
%@ 0168-9002
%G English
%F NEXTCollaborationCebrian_etal2015
%O WOS:000364133700002
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2442), last updated on Mon, 15 Jun 2020 09:34:25 +0000
%X 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.
%K Double-beta decay
%K Gamma and electron detection
%K Microbulk micromegas
%K Time projection chamber
%K High pressure Xenon-Trimehylamine
%K Penning-Fluorescent mixtures
%R 10.1016/j.nima.2015.08.033
%U http://arxiv.org/abs/1504.03678
%U https://doi.org/10.1016/j.nima.2015.08.033
%P 8-24