First results of the NEXT-100 detector using $^{83m}$Kr decays
Abstract
The NEXT collaboration is investigating the double beta decay of 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 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 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 extrapolation to yields an energy resolution close to 0.5% FWHM, well below the 1% FWHM design target.
Cite
@article{arxiv.2511.01710,
title = {First results of the NEXT-100 detector using $^{83m}$Kr decays},
author = {NEXT Collaboration and G. Martínez-Lema and C. Hervés Carrete and S. Torelli and M. Cid Laso and P. Vázquez Cabaleiro and B. Palmeiro and J. A. Hernando Morata and J. J. Gómez-Cadenas and C. Adams and H. Almazán and V. Álvarez and A. I. Aranburu and L. Arazi and I. J. Arnquist and F. Auria-Luna and S. Ayet and Y. Ayyad and C. D. R. Azevedo and K. Bailey and F. Ballester and J. E. Barcelon and M. del Barrio-Torregrosa and A. Bayo and J. M. Benlloch-Rodríguez and F. I. G. M. Borges and A. Brodoline and N. Byrnes and A. Castillo and E. Church and L. Cid and X. Cid and C. A. N. Conde and C. Cortes-Parra and F. P. Cossío and R. Coupe and E. Dey and P. Dietz and C. Echeverria and M. Elorza and R. Esteve and R. Felkai and L. M. P. Fernandes and P. Ferrario and F. W. Foss and Z. Freixa and J. García-Barrena and J. W. R. Grocott and R. Guenette and J. Hauptman and C. A. O. Henriques and P. Herrero-Gómez and V. Herrero and Y. Ifergan and A. F. B. Isabel and B. J. P. Jones and F. Kellerer and L. Larizgoitia and A. Larumbe and P. Lebrun and F. Lopez and N. López-March and R. Madigan and R. D. P. Mano and A. Marauri and A. P. Marques and J. Martín-Albo and A. Martínez and M. Martínez-Vara and R. L. Miller and K. Mistry and J. Molina-Canteras and F. Monrabal and C. M. B. Monteiro and F. J. Mora and K. E. Navarro and P. Novella and D. R. Nygren and E. Oblak and J. Palacio and A. Para and I. Parmaksiz and A. Pazos and J. Pelegrin and M. Pérez Maneiro and M. Querol and J. Renner and I. Rivilla and C. Rogero and L. Rogers and B. Romeo and C. Romo-Luque and E. Ruiz-Chóliz and P. Saharia and F. P. Santos and J. M. F. dos Santos and M. Seemann and I. Shomroni and A. L. M. Silva and P. A. O. C. Silva and A. Simón and S. R. Soleti and M. Sorel and J. Soto-Oton and J. M. R. Teixeira and S. Teruel-Pardo and J. F. Toledo and C. Tonnelé and J. Torrent and A. Trettin and P. R. G. Valle and M. Vanga and J. F. C. A. Veloso and J. D. Villamil and J. Waiton and A. Yubero-Navarro},
journal= {arXiv preprint arXiv:2511.01710},
year = {2026}
}
Comments
13 pages, 11 figures