Low-energy threshold demonstration for dark matter searches in TREX-DM with an 37Ar source produced at CNA HiSPANoS

We report on the successful implementation of an 37Ar calibration source in the TREX-DM detector, a high-pressure time projection chamber designed for low-mass dark matter searches. The 37Ar source was produced through fast neutron activation of CaO powder at the HiSPANoS facility of Centro Nacional...

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Detalles Bibliográficos
Autores: Castel, Juan Francisco, Cebrián, Susana, Dafni, Theopisti, Díez-Ibáñez, David, Ezquerro, Álvaro, Fernández, Begoña, Galán, Javier, García, Juan Antonio, Guerrero, Carlos, García Irastorza, Igor, Luzón, Gloria, Margalejo, Cristina, Mirallas, Héctor, Obis, Luis, Ortiz de Solórzano, Alfonso, Pérez Lázaro, Óscar, Porrón, Jorge, Jiménez Puyuelo, María, Quintana, Ana
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2026
País:España
Institución:Universidad de Zaragoza
Repositorio:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:dnet:zaguan______::03b7bf851702847a9a3889d64de9668b
Acceso en línea:http://zaguan.unizar.es/record/171651
Access Level:acceso embargado
Descripción
Sumario:We report on the successful implementation of an 37Ar calibration source in the TREX-DM detector, a high-pressure time projection chamber designed for low-mass dark matter searches. The 37Ar source was produced through fast neutron activation of CaO powder at the HiSPANoS facility of Centro Nacional de Aceleradores (CNA) in Spain, yielding O(1) kBq of activity. Using a novel combined GEM-Micromegas readout system, we successfully detected both characteristic emissions from 37Ar decay (2.82 keV and 270 eV) and achieved unprecedented energy threshold performance in TREX-DM, approaching the single-electron ionization energy of argon.