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arXiv · 2511.01710

First results of the NEXT-100 detector using $^{83m}$Kr decays

NEXT Collaboration·G. Martínez-Lema·C. Hervés Carrete·S. Torelli·M. Cid Laso·P. Vázquez Cabaleiro·B. Palmeiro·J. A. Hernando Morata·J. J. Gómez-Cadenas·C. Adams·H. Almazán·V. Álvarez·A. I. Aranburu·L. Arazi·I. J. Arnquist·F. Auria-Luna·S. Ayet·Y. Ayyad·C. D. R. Azevedo·K. Bailey·F. Ballester·J. E. Barcelon·M. del Barrio-Torregrosa·A. Bayo·J. M. Benlloch-Rodríguez·F. I. G. M. Borges·A. Brodoline·N. Byrnes·A. Castillo·E. Church·L. Cid·X. Cid·C. A. N. Conde·C. Cortes-Parra·F. P. Cossío·R. Coupe·E. Dey·P. Dietz·C. Echeverria·M. Elorza·R. Esteve·R. Felkai·L. M. P. Fernandes·P. Ferrario·F. W. Foss·Z. Freixa·J. García-Barrena·J. W. R. Grocott·R. Guenette·J. Hauptman·C. A. O. Henriques·P. Herrero-Gómez·V. Herrero·Y. Ifergan·A. F. B. Isabel·B. J. P. Jones·F. Kellerer·L. Larizgoitia·A. Larumbe·P. Lebrun·F. Lopez·N. López-March·R. Madigan·R. D. P. Mano·A. Marauri·A. P. Marques·J. Martín-Albo·A. Martínez·M. Martínez-Vara·R. L. Miller·K. Mistry·J. Molina-Canteras·F. Monrabal·C. M. B. Monteiro·F. J. Mora·K. E. Navarro·P. Novella·D. R. Nygren·E. Oblak·J. Palacio·A. Para·I. Parmaksiz·A. Pazos·J. Pelegrin·M. Pérez Maneiro·M. Querol·J. Renner·I. Rivilla·C. Rogero·L. Rogers·B. Romeo·C. Romo-Luque·E. Ruiz-Chóliz·P. Saharia·F. P. Santos·J. M. F. dos Santos·M. Seemann·I. Shomroni·A. L. M. Silva·P. A. O. C. Silva
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Abstract

The NEXT collaboration is investigating the double beta decay of $^{136}$Xe using high-pressure gas electroluminescent time projection chambers, which provide excellent energy resolution together with a robust topological signature. Operating at the Laboratorio Subterr\'aneo de Canfranc (LSC) and building on the success of the NEXT-White detector, the NEXT-100 apparatus began commissioning in May 2024 and started operation with xenon at a pressure of 4 bar in October 2024. We report here the first results obtained with NEXT-100 using low-energy calibration data from $^{83m}$Kr decays, which allow mapping of the detector response in the active volume and monitoring of its stability over time. After homogenizing the light response, we achieve an energy resolution of 4.37% FWHM at 41.5 keV for $^{83m}$Kr point-like energy deposits contained in a radius of 425 mm. In a fiducial region representing the operating conditions of NEXT-100 at 10 bar we obtain an improved energy resolution of 4.16% FWHM. These results are in good agreement with that obtained in NEXT-White, and an $E^{-1/2}$ extrapolation to $Q_{\beta\beta}$ yields an energy resolution close to 0.5% FWHM, well below the 1% FWHM design target.

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NEXT Collaboration, G. Martínez-Lema, C. Hervés Carrete, S. Torelli, M. Cid Laso, P. Vázquez Cabaleiro, B. Palmeiro, J. A. Hernando Morata, J. J. Gómez-Cadenas, C. Adams, H. Almazán, V. Álvarez, A. I. Aranburu, L. Arazi, I. J. Arnquist, F. Auria-Luna, S. Ayet, Y. Ayyad, C. D. R. Azevedo, K. Bailey, F. Ballester, J. E. Barcelon, M. del Barrio-Torregrosa, A. Bayo, J. M. Benlloch-Rodríguez, F. I. G. M. Borges, A. Brodoline, N. Byrnes, A. Castillo, E. Church, L. Cid, X. Cid, C. A. N. Conde, C. Cortes-Parra, F. P. Cossío, R. Coupe, E. Dey, P. Dietz, C. Echeverria, M. Elorza, R. Esteve, R. Felkai, L. M. P. Fernandes, P. Ferrario, F. W. Foss, Z. Freixa, J. García-Barrena, J. W. R. Grocott, R. Guenette, J. Hauptman, C. A. O. Henriques, P. Herrero-Gómez, V. Herrero, Y. Ifergan, A. F. B. Isabel, B. J. P. Jones, F. Kellerer, L. Larizgoitia, A. Larumbe, P. Lebrun, F. Lopez, N. López-March, R. Madigan, R. D. P. Mano, A. Marauri, A. P. Marques, J. Martín-Albo, A. Martínez, M. Martínez-Vara, R. L. Miller, K. Mistry, J. Molina-Canteras, F. Monrabal, C. M. B. Monteiro, F. J. Mora, K. E. Navarro, P. Novella, D. R. Nygren, E. Oblak, J. Palacio, A. Para, I. Parmaksiz, A. Pazos, J. Pelegrin, M. Pérez Maneiro, M. Querol, J. Renner, I. Rivilla, C. Rogero, L. Rogers, B. Romeo, C. Romo-Luque, E. Ruiz-Chóliz, P. Saharia, F. P. Santos, J. M. F. dos Santos, M. Seemann, I. Shomroni, A. L. M. Silva, P. A. O. C. Silva. 2025-11-03. First results of the NEXT-100 detector using $^{83m}$Kr decays. https://doi.org/10.1140/epjc/s10052-026-15736-7

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