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27 April 2024

» arxiv » 1211.4474

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Near-Intrinsic Energy Resolution for 30 to 662 keV Gamma Rays in a High Pressure Xenon Electroluminescent TPC
NEXT Collaboration ; V. Álvarez ; F. I. G. M. Borges ; S. Cárcel ; J. Castel ; S. Cebrián ; A. Cervera ; C. A. N. Conde ; T. Dafni ; T. H. V. T. Dias ; J. Díaz ; M. Egorov ; R. Esteve ; P. Evtoukhovitch ; L. M. P. Fernandes ; P. Ferrario ; A. L. Ferreira ; E. D. C. Freitas ; V. M. Gehman ; A. Gil ; A. Goldschmidt ; H. Gómez ; J. J. Gómez-Cadenas ; D. González-Díaz ; R. M. Gutiérrez ; J. Hauptman ; J. A. Hernando Morata ; D. C. Herrera ; F. J. Iguaz ; I. G. Irastorza ; M. A. Jinete ; L. Labarga ; A. Laing ; I. Liubarsky ; J. A. M. Lopes ; D. Lorca ; M. Losada ; G. Luzón ; A. Marí ; J. Martín-Albo ; A. Martínez ; T. Miller ; A. Moiseenko ; F. Monrabal ; C. M. B. Monteiro ; F. J. Mora ; L. M. Moutinho ; J. Muñoz Vidal ; H. Natal da Luz ; G. Navarro ; M. Nebot ; D. Nygren ; C. A. B. Oliveira ; R. Palma ; J. Pérez ; J. L. Pérez Aparicio ; J. Renner ; L. Ripoll ; A. Rodríguez ; J. Rodríguez ; F. P. Santos ; J. M. F. dos Santos ; L. Segui ; L. Serra ; D. Shuman ; A. Simón ; C. Sofka ; M. Sorel ; J. F. Toledo ; A. Tomás ; J. Torrent ; Z. Tsamalaidze ; D. Vázquez ; J. F. C. A. Veloso ; J. A. Villar ; R. Webb ; J. T White ; N. Yahlali ;
Date:	19 Nov 2012
Abstract:	We present the design, data and results from the NEXT prototype for Double Beta and Dark Matter (NEXT-DBDM) detector, a high-pressure gaseous natural xenon electroluminescent time projection chamber (TPC) that was built at the Lawrence Berkeley National Laboratory. It is a prototype of the planned NEXT-100 $^{136}$Xe neutrino-less double beta decay ($0 uetaeta$) experiment with the main objectives of demonstrating near-intrinsic energy resolution at energies up to 662 keV and of optimizing the NEXT-100 detector design and operating parameters. Energy resolutions of $sim$1% FWHM for 662 keV gamma rays were obtained at 10 and 15 atm and $sim$5% FWHM for 30 keV fluorescence xenon X-rays. These results demonstrate that 0.5% FWHM resolutions for the 2,459 keV hypothetical neutrino-less double beta decay peak are realizable. This energy resolution is a factor 7 to 20 better than that of the current leading $0 uetaeta$ experiments using liquid xenon and thus represents a significant advancement. We present also first results from a track imaging system consisting of 64 silicon photo-multipliers recently installed in NEXT-DBDM that, along with the excellent energy resolution, demonstrates the key functionalities required for the NEXT-100 $0 uetaeta$ search.
Source:	arXiv, 1211.4474
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