Caballero Rodríguez, MiriamSánchez Tembleque Verbo, VíctorFraile Prieto, Luis MarioFonseca Vargas, C.Gaitán Domínguez, SaraKim, H.J.Martínez Nouvilas, VíctorMartínez Roig, M.Nácher, E.Udías Moinelo, José ManuelVuong, P.Q.2025-10-062025-10-062026-02Caballero, M., Sánchez-Tembleque, V., Fraile, L.M., Fonseca-Vargas, C., Gaitán, S., Kim, H.J., Martínez-Nouvilas, V., Martínez-Roig, M., Nácher, E., Udías, J.M., Vuong, P.Q., 2026. Time response of an undoped LaCl 3 crystal. Radiation Physics and Chemistry 239, 113239. https://doi.org/10.1016/j.radphyschem.2025.1132390969-806X10.1016/j.radphyschem.2025.113239https://hdl.handle.net/20.500.14352/124558© 2025 The Authors. CIPROM/2021/064We have characterized a detector equipped with an undoped LaCl truncated cone crystal with dimensions of 22.5 mm in the largest diameter, 16 mm in the smallest diameter, and 16 mm in height, coupled to a fast Photonis XP2020/URQ photomultiplier tube (PMT). Its time response at 511 keV (22Na) and 60Co photon energies has been measured against a reference detector using a fast digitizer module by digital signal processing methods based on a genetic algorithm. The time resolution was optimized by the choice of the photomultiplier bias voltage and the fine-tuning of the digital parameters of the time pickup algorithm. The de-convoluted full width at half maximum (FWHM) time resolution is found to be 250 ± 10 ps at 60Co energies, and 444 ± 8 ps using positron annihilation -rays from 22Na, providing good prospects for the use of the crystal in applications requiring a fast time response.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/journal article1879-0895https://doi.org/10.1016/j.radphyschem.2025.113239https://www.sciencedirect.com/science/article/pii/S0969806X25007315?via%3Dihubopen access544539.1Inorganic scintillatorsLaCl3LaBr3(Ce)Photonis XP2020/URQ photomultiplier tubeDigital signal processingTime resolutionTime walkFast timingQuímica física (Física)Física nuclear2210 Química Física2207 Física Atómica y Nuclear