engGonzález-Díaz, D.Álvarez, V.Borges, F.I.G.Camargo, M.Cárcel, S.Cebrián, S.Cervera, A.Conde, C.A.N.Dafni, T.Díaz, J.Esteve, R.Fernandes, L.M.P.Ferrario, P.Ferreira, A.L.Freitas, E.D.C.Gehman, V.M.Goldschmidt, A.Gómez-Cadenas, J.J.Gutiérrez, R.M.Hauptman, J.Hernando Morata, J.A.Herrera, D.C.García-Irastorza, I.Labarga, L.Laing, A.Liubarsky, I.Lopez-March, N.Lorca, D.Losada, M.Luzón, G.Marí, A.Martín-Albo, J.Martínez-Lema, G.Martínez, A.Miller, T.Monrabal, F.Monserrate, M.Monteiro, C.M.B.Mora, F.J.Moutinho, L.M.Muñoz Vidal, J.Nebot-Guinot, M.Nygren, D.Oliveira, C.A.B.Pérez, J.Pérez Aparicio, J.L.Querol, M.Renner, J.Ripoll, L.Rodríguez, J.Santos, F.P.Dos Santos, J.M.F.Serra, L.Shuman, D.Simón, A.Sofka, C.Sorel, M.Toledo, J.F.Torrent, J.Tsamalaidze, Z.Veloso, J.F.C.A.Villar, J.A.Webb, R.White, J.T.Yahlali, N.Azevedo, C.Aznar, F.Calvet, D.Castel, J.Ferrer-Ribas, E.García, J.A.Giomataris, I.Gómez, H.Iguaz, F.J.Lagraba, A.Le Coguie, A.Mols, J.P.Sahin, Ö.Rodríguez, A.Ruiz-Choliz, E.Segui, L.Tomás, A.Veenhof, R.Accurate gamma and MeV-electron track reconstruction with an ultra-low diffusion Xenon/TMA TPC at 10 atmART-2015-92279We report the performance of a 10 atm Xenon/trimethylamine time projection chamber (TPC) for the detection of X-rays (30 keV) and ¿-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 ~1%-admixtures, trimethylamine (TMA) endows Xenon with an extremely low electron diffusion (1.3±0.13mm-s (longitudinal), 0.95±0.20mm-s (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 8mm×8mm×1.2mm for approximately 10 cm/MeV-long electron tracks. Resolution in energy (e) at full width half maximum (R) inside the fiducial volume ranged from R=14.6% (30 keV) to R=4.6%(1.275MeV). 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 (ßß0¿) in 136Xe, 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%v1MeV/e levels obtained in small sensors are discussed.2015http://zaguan.unizar.es/record/148815http://zaguan.unizar.es/record/148815oai:zaguan.unizar.es:148815info:eu-repo/grantAgreement/EC/FP7/240054/EU/Novel Developments in Time Projection Chambers (TPCs) for Rare Event Searches in Underground Astroparticle EXperiments/TREXinfo:eu-repo/grantAgreement/EC/FP7/339787/EU/Towards the NEXT generation of bb0nu experimets/NEXTinfo:eu-repo/grantAgreement/ES/MICINN/CPAN-CSD2007-00042info:eu-repo/grantAgreement/ES/MINECO/Consolider-Ingenio-2010/CSD2008-00037info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2008-03456info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2009-13697Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 804 (2015), 8-24byhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccess