Pulse Shape Model for a Light Enhanced Phonon Detector

G. Angloher; M. R. Bharadwaj; A. Böhmer; S. Braun; M. R. Cababie; I. Colantoni; I. Dafinei; N. Di Marco; C. Dittmar; F. Ferella; F. Ferroni; S. Fichtinger; A. Filipponi; M. Friedl; D. Fuchs; L. Gai; M. Gapp; M. Heikinheimo; K. Heim; M. N. Hughes; K. Huitu; M. Kellermann; A. Mancuso; L. Pagnanini; F. Petricca; C. Petrucci; S. Pirro; F. Pröbst; G. Profeta; A. Puiu; F. Reindl; K. Schäffner; J. Schieck; P. Schreiner; C. Schwertner; P. Settembri; K. Shera; M. Stahlberg; A. Stendahl; M. Stukel; C. Tresca; S. Yue; V. Zema; Y. Zhu; L. Ziegele; N. Zimmermann; O. Schulz

arXiv · 2610.28161

Pulse Shape Model for a Light Enhanced Phonon Detector

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Abstract

COSINUS has tested prototype NaI-based cryogenic scintillating calorimeters with a composite design, in which the transition edge sensor (TES) is fabricated on a separate carrier crystal coupled to the NaI target. Measurements with the composite detectors showed deviations from the known pulse shape description for cryogenic calorimeters and did not reveal an identifiable nuclear recoil population during a neutron calibration. In this work we present a new pulse shape model which provides an explanation to these observations and that laid the foundation for the development of the final COSINUS phonon detector design named remote TES (remoTES). We demonstrate that the first COSINUS detector prototypes featured a phonon channel with signal enhancement by light absorption in the carrier, namely a light enhanced phonon detector. This design offers for the first time the chance to use a single channel phonon detector for particle discrimination. We present recent results using a novel pulse shape fitting method based on the Bayesian inference software package BAT.jl.

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G. Angloher, M. R. Bharadwaj, A. Böhmer, S. Braun, M. R. Cababie, I. Colantoni, I. Dafinei, N. Di Marco, C. Dittmar, F. Ferella, F. Ferroni, S. Fichtinger, A. Filipponi, M. Friedl, D. Fuchs, L. Gai, M. Gapp, M. Heikinheimo, K. Heim, M. N. Hughes, K. Huitu, M. Kellermann, A. Mancuso, L. Pagnanini, F. Petricca, C. Petrucci, S. Pirro, F. Pröbst, G. Profeta, A. Puiu, F. Reindl, K. Schäffner, J. Schieck, P. Schreiner, C. Schwertner, P. Settembri, K. Shera, M. Stahlberg, A. Stendahl, M. Stukel, C. Tresca, S. Yue, V. Zema, Y. Zhu, L. Ziegele, N. Zimmermann, O. Schulz. 2026-10-20. Pulse Shape Model for a Light Enhanced Phonon Detector. https://arxiv.org/abs/2610.28161

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