Accurate γ and MeV-electron track reconstruction with an ultra-low diffusion Xenon/TMA TPC at 10 atm

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ID: 272861
2015
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Abstract
We report the performance of a 10 atm Xenon/trimethylamine time projection chamber (TPC) for the detection of X-rays (30 keV) and γ-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-σ (longitudinal), 0.95±0.20mm-σ (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 (ε) 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 (ββ0ν) 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%1MeV/ε levels obtained in small sensors are discussed.
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Authors Diego González-Díaz, V. Álvarez, F.i.g. Borges, M. Camargo, S. Cárcel, S. Cebrián, A. Cervera, C.a.n. Conde, T. Dafni, J. Díaz, R. Esteve, L.m.p. Fernandes, P. Ferrario, A.L. Ferreira, E.d.c. Freitas, V.M. Gehman, A. Goldschmidt, J.J. Gómez-Cadenas, R.M. Gutiérrez, J. Hauptman, J.A. Hernando Morata, D.C. Herrera, I.G. Irastorza, L. Labarga, A. Laing, I. Liubarsky, N. Lopez-March, D. Lorca, M. Losada, G. Luzón, A. Marí, J. Martín-Albo, G. Martínez-Lema, A. Martínez, T. Miller, F. Monrabal, M. Monserrate, C.m.b. Monteiro, F.J. Mora, L.M. Moutinho, J. Muñoz Vidal, M. Nebot-Guinot, D. Nygren, C.a.b. Oliveira, J. Pérez, J.L. Pérez Aparicio, M. Querol, J. Renner, L. Ripoll, J. Rodríguez, F.P. Santos, J.m.f. dos Santos, L. Serra, D. Shuman, A. Simón, C. Sofka, M. Sorel, J.F. Toledo, J. Torrent, Z. Tsamalaidze, J.f.c.a. Veloso, J.A. Villar, R. Webb, J.T. White, N. Yahlali, C. Azevedo, F. Aznar, D. Calvet, J. Castel, E. Ferrer-Ribas, J.A. García, I. Giomataris, H. Gómez, F.J. Iguaz, A. Lagraba, A. Le Coguie, J.P. Mols, Ö. Şahin, E. Ruiz-Choliz, L. Segui, A. Tomás, R. Veenhof
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Journal nuclear instruments and methods in physics research section a: accelerators, spectrometers, detectors and associated equipment
Year 2015
DOI
10.1016/j.nima.2015.08.033
URL
https://sciprofiles.com/publication/view/4c97442dfb8d481ab57a425a6ae5b31e
Keywords
time projection chamber double-beta decay gamma and electron detection microbulk micromegas high pressure xenon-trimehylamine penning-fluorescent mixtures

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