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5 results on '"Borges, F.I.G."'

1. Background rejection in NEXT using deep neural networks

Author

Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials, Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros de Telecomunicación - Escola Tècnica Superior d'Enginyers de Telecomunicació, Universitat Politècnica de València. Escuela Politécnica Superior de Gandia - Escola Politècnica Superior de Gandia, European Commission, Ministerio de Economía y Competitividad, Generalitat Valenciana, U.S. Department of Energy, Ministerio de Ciencia e Innovación, Renner, J., Farbin, A., Muñoz Vidal, J., Benlloch-Rodríguez, J.M., Botas, A., Ferrario, P., Gómez-Cadenas, J.J., Álvarez, V., Azevedo, C.D.R., Borges, F.I.G., Cárcel, S., Carrión, J.V., Esteve Bosch, Raul, Herrero Bosch, Vicente, Mora Mas, Francisco José, Toledo Alarcón, José Francisco, Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials, Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros de Telecomunicación - Escola Tècnica Superior d'Enginyers de Telecomunicació, Universitat Politècnica de València. Escuela Politécnica Superior de Gandia - Escola Politècnica Superior de Gandia, European Commission, Ministerio de Economía y Competitividad, Generalitat Valenciana, U.S. Department of Energy, Ministerio de Ciencia e Innovación, Renner, J., Farbin, A., Muñoz Vidal, J., Benlloch-Rodríguez, J.M., Botas, A., Ferrario, P., Gómez-Cadenas, J.J., Álvarez, V., Azevedo, C.D.R., Borges, F.I.G., Cárcel, S., Carrión, J.V., Esteve Bosch, Raul, Herrero Bosch, Vicente, Mora Mas, Francisco José, and Toledo Alarcón, José Francisco

Abstract

[EN] We investigate the potential of using deep learning techniques to reject background events in searches for neutrinoless double beta decay with high pressure xenon time projection chambers capable of detailed track reconstruction. The differences in the topological signatures of background and signal events can be learned by deep neural networks via training over many thousands of events. These networks can then be used to classify further events as signal or background, providing an additional background rejection factor at an acceptable loss of efficiency. The networks trained in this study performed better than previous methods developed based on the use of the same topological signatures by a factor of 1.2 to 1.6, and there is potential for further improvement.

Published
2017

2. First proof of topological signature in high pressure xenon gas with electroluminescence amplification

Author

Ferrario, P., Laing, A., López-March, N., Gómez-Cadenas, J.J., Álvarez, V., Azevedo, C.D.R., Borges, F.I.G., Cárcel, S., Cebrián, S., Cervera, A., Conde, C.A.N., Dafni, T., Díaz, J., Diesburg, M., Esteve, R., Fernandes, L.M.P., Ferreira, A.L., Freitas, E.D.C., Gehman, V.M., Goldschmidt, A., González-Díaz, D., Gutiérrez, R.M., Hauptman, J., Henriques, C.A.O., Hernando Morata, J.A., Irastorza, I.G., Labarga, L., Lebrun, P., Liubarsky, I., 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., Novella, P., Nygren, D., Para, A., 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., and Yepes-Ramírez, H.

Subjects
Detectors and Experimental Techniques
Abstract

The NEXT experiment aims to observe the neutrinoless double beta decay of xenon in a high-pressure Xe136 gas TPC using electroluminescence (EL) to amplify the signal from ionization. One of the main advantages of this technology is the possibility to reconstruct the topology of events with energies close to Qbb. This paper presents the first demonstration that the topology provides extra handles to reject background events using data obtained with the NEXT-DEMO prototype. Single electrons resulting from the interactions of Na22 1275 keV gammas and electron-positron pairs produced by conversions of gammas from the Th228 decay chain were used to represent the background and the signal in a double beta decay. These data were used to develop algorithms for the reconstruction of tracks and the identification of the energy deposited at the end-points, providing an extra background rejection factor of 24.3 +- 1.4 (stat.)%, while maintaining an efficiency of 66.7 +- 0.6 (stat.)% for signal events. The NEXT experiment aims to observe the neutrinoless double beta decay of$^{136}$Xe in a high-pressure xenon gas TPC using electroluminescence (EL) to amplify the signal from ionization. One of the main advantages of this technology is the possibility to reconstruct the topology of events with energies close to Q$_{ββ}$ . This paper presents the first demonstration that the topology provides extra handles to reject background events using data obtained with the NEXT-DEMO prototype. The NEXT experiment aims to observe the neutrinoless double beta decay of xenon in a high-pressure Xe136 gas TPC using electroluminescence (EL) to amplify the signal from ionization. One of the main advantages of this technology is the possibility to reconstruct the topology of events with energies close to Qbb. This paper presents the first demonstration that the topology provides extra handles to reject background events using data obtained with the NEXT-DEMO prototype. Single electrons resulting from the interactions of Na22 1275 keV gammas and electron-positron pairs produced by conversions of gammas from the Th228 decay chain were used to represent the background and the signal in a double beta decay. These data were used to develop algorithms for the reconstruction of tracks and the identification of the energy deposited at the end-points, providing an extra background rejection factor of 24.3 +- 1.4 (stat.)%, while maintaining an efficiency of 66.7 +- 1% for signal events.

Published
2015

3. Sensitivity of NEXT-100 to neutrinoless double beta decay

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, U.S. Department of Energy, European Research Council, European Regional Development Fund, Ministerio de Ciencia e Innovación, Ministerio de Economía y Competitividad, Fundação para a Ciência e a Tecnologia, Portugal, Martín-Albo, J., Muñoz Vidal, J., Ferrario, P., Nebot-Guinot, M., Gomez-Cadenas, J. J., Álvarez-Puerta, Vicente, Azevedo, C.D.R., Borges, F.I.G., Carcel, S., Esteve Bosch, Raul, Herrero Bosch, Vicente, Mora Mas, Francisco José, Querol, M., Rodriguez-Samaniego, Javier, Toledo Alarcón, José Francisco, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, U.S. Department of Energy, European Research Council, European Regional Development Fund, Ministerio de Ciencia e Innovación, Ministerio de Economía y Competitividad, Fundação para a Ciência e a Tecnologia, Portugal, Martín-Albo, J., Muñoz Vidal, J., Ferrario, P., Nebot-Guinot, M., Gomez-Cadenas, J. J., Álvarez-Puerta, Vicente, Azevedo, C.D.R., Borges, F.I.G., Carcel, S., Esteve Bosch, Raul, Herrero Bosch, Vicente, Mora Mas, Francisco José, Querol, M., Rodriguez-Samaniego, Javier, and Toledo Alarcón, José Francisco

Abstract

[EN] NEXT-100 is an electroluminescent high-pressure xenon gas time projection chamber that will search for the neutrinoless double beta (0¿ßß) decay of 136Xe. The detector possesses two features of great value for 0¿ßß searches: energy resolution better than 1% FWHM at the Q value of 136Xe and track reconstruction for the discrimination of signal and background events. This combination results in excellent sensitivity, as discussed in this paper. Material-screening measurements and a detailed Monte Carlo detector simulation predict a background rate for NEXT-100 of at most 4 × 10¿4 counts keV¿1 kg¿1 yr¿1. Accordingly, the detector will reach a sensitivity to the 0¿ßß-decay half-life of 2.8 × 1025 years (90% CL) for an exposure of 100 kg·year, or 6.0 × 1025 years after a run of 3 effective years.

Published
2016

4. Present status and future perspectives of the NEXT experiment

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, Universitat Politècnica de València. Departamento de Mecánica de los Medios Continuos y Teoría de Estructuras - Departament de Mecànica dels Medis Continus i Teoria d'Estructures, Ministerio de Economía y Competitividad, U.S. Department of Energy, Fundação para a Ciência e a Tecnologia, Portugal, Ministerio de Ciencia e Innovación, Gómez Cadenas. J.J., Álvarez, V., Borges, F.I.G., Cárcel, S., Castel, J., Cebrián, S., Cerverá, A., Conde, C.A.N., Dafni, T., Dias, T.H.V.T., Díaz, J., Egorov, M., Esteve Bosch, Raul, Evtoukhovitch, P., Fernandes, L.M.P., Ferrario, P., Ferreira, A.L., Freitas, E.D.C., Gehman, V.M., Gil, A., Goldschmidt, A., Gómez, H., González Díaz, D., Gutiérrez, R.M., Hauptman, J., Hernando Morata, J.A., Herrera, D.C., Iguaz, F.J., Irastorza, J.G., Jinete, M.A., Labarga, L., Laig, A., Liubarsky, I., Lopez, J.A.M., Lorca, D., Losada, M., Luzón, M., Marí Romero, Antonio Francisco, Martín Albo, J., Martínez, A., Miller, T., Moissenko, A., Monrabal, F., Monserrate, M., Monteiro, C.M.B, Mora Mas, Francisco José, Moutinho, L.M., Muñoz Vidal, J., Natal da Luz, H., Navarro, G., Nebot Guínot, M., Nygren, D., Oliviera, C.A.B., Palma, R., Pérez, Javier, Pérez Aparicio, José Luis, Renner, J., Ripoll, L., Rodríguez, A., Rodríguez, J., Santos, F.P., Dos Santos, J.M.F., Seguí, L., Serra, L., Shuman, D., Simón, A., Sofka, C., Sorel, M., Toledo Alarcón, José Francisco, Tomás, A., Torrent, J., Tsamalaidze, Z., Veloso, J.F.C.A., Villar, J.A., Webb, R., White, J., Yahlali Haddou, Nadia, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, Universitat Politècnica de València. Departamento de Mecánica de los Medios Continuos y Teoría de Estructuras - Departament de Mecànica dels Medis Continus i Teoria d'Estructures, Ministerio de Economía y Competitividad, U.S. Department of Energy, Fundação para a Ciência e a Tecnologia, Portugal, Ministerio de Ciencia e Innovación, Gómez Cadenas. J.J., Álvarez, V., Borges, F.I.G., Cárcel, S., Castel, J., Cebrián, S., Cerverá, A., Conde, C.A.N., Dafni, T., Dias, T.H.V.T., Díaz, J., Egorov, M., Esteve Bosch, Raul, Evtoukhovitch, P., Fernandes, L.M.P., Ferrario, P., Ferreira, A.L., Freitas, E.D.C., Gehman, V.M., Gil, A., Goldschmidt, A., Gómez, H., González Díaz, D., Gutiérrez, R.M., Hauptman, J., Hernando Morata, J.A., Herrera, D.C., Iguaz, F.J., Irastorza, J.G., Jinete, M.A., Labarga, L., Laig, A., Liubarsky, I., Lopez, J.A.M., Lorca, D., Losada, M., Luzón, M., Marí Romero, Antonio Francisco, Martín Albo, J., Martínez, A., Miller, T., Moissenko, A., Monrabal, F., Monserrate, M., Monteiro, C.M.B, Mora Mas, Francisco José, Moutinho, L.M., Muñoz Vidal, J., Natal da Luz, H., Navarro, G., Nebot Guínot, M., Nygren, D., Oliviera, C.A.B., Palma, R., Pérez, Javier, Pérez Aparicio, José Luis, Renner, J., Ripoll, L., Rodríguez, A., Rodríguez, J., Santos, F.P., Dos Santos, J.M.F., Seguí, L., Serra, L., Shuman, D., Simón, A., Sofka, C., Sorel, M., Toledo Alarcón, José Francisco, Tomás, A., Torrent, J., Tsamalaidze, Z., Veloso, J.F.C.A., Villar, J.A., Webb, R., White, J., and Yahlali Haddou, Nadia

Abstract

[EN] NEXT is an experiment dedicated to neutrinoless double beta decay searches in xenon. The detector is a TPC, holding 100 kg of high-pressure xenon enriched in the 136Xe isotope. It is under construction in the Laboratorio Subterráneo de Canfranc in Spain, and it will begin operations in 2015. The NEXT detector concept provides an energy resolutionbetter than 1% FWHM and a topological signal that can be used to reduce the background. Furthermore, the NEXT technology can be extrapolated to a 1 ton-scale experiment.

Published
2014

5. Characterisation of NEXT-DEMO using xenon Ka X-rays

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, Universitat Politècnica de València. Departamento de Mecánica de los Medios Continuos y Teoría de Estructuras - Departament de Mecànica dels Medis Continus i Teoria d'Estructures, European Commission, Ministerio de Economía y Competitividad, U.S. Department of Energy, Fundação para a Ciência e a Tecnologia, Portugal, Ministerio de Ciencia e Innovación, Lorca, D., Martín Albo, J., Laing, A., Ferrario, P., Gómez Cadenas, J.J., Álvarez, V., Borges, F.I.G., Camargo, M., Esteve Bosch, Raul, Fernandes, L.M.P., Ferreira, A.L., Marí Romero, Antonio Francisco, Mora Mas, Francisco José, Pérez Aparicio, José Luis, Toledo Alarcón, José Francisco, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, Universitat Politècnica de València. Departamento de Mecánica de los Medios Continuos y Teoría de Estructuras - Departament de Mecànica dels Medis Continus i Teoria d'Estructures, European Commission, Ministerio de Economía y Competitividad, U.S. Department of Energy, Fundação para a Ciência e a Tecnologia, Portugal, Ministerio de Ciencia e Innovación, Lorca, D., Martín Albo, J., Laing, A., Ferrario, P., Gómez Cadenas, J.J., Álvarez, V., Borges, F.I.G., Camargo, M., Esteve Bosch, Raul, Fernandes, L.M.P., Ferreira, A.L., Marí Romero, Antonio Francisco, Mora Mas, Francisco José, Pérez Aparicio, José Luis, and Toledo Alarcón, José Francisco

Abstract

[EN] The NEXT experiment aims to observe the neutrinoless double beta decay of 136Xe in a high-pressure xenon gas TPC using electroluminescence (EL) to amplify the signal from ionization. Understanding the response of the detector is imperative in achieving a consistent and well understood energy measurement. The abundance of xenon K-shell X-ray emission during data taking has been identified as a multitool for the characterisation of the fundamental parameters of the gas as well as the equalisation of the response of the detector. The NEXT-DEMO prototype is a 1.5 kg volume TPC filled with natural xenon. It employs an array of 19 PMTs as an energy plane and of 256 SiPMs as a tracking plane with the TPC light tube and SiPM surfaces being coated with tetraphenyl butadiene (TPB) which acts as a wavelength shifter for the VUV scintillation light produced by xenon. This paper presents the measurement of the properties of the drift of electrons in the TPC, the effects of the EL production region, and the extraction of position dependent correction constants using Ka X-ray deposits. These constants were used to equalise the response of the detector to deposits left by gammas from 22Na.

Published
2014

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