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Accepted · first revision · record

Title: Do single-sensor and shared excess events have different origins?
Plain: When two sensors are mounted on the same crystal, some excess events show up in only one sensor and others in both. Deciding whether these come from the sensor or from the crystal narrows the cause.
Precise: In two-channel athermal phonon detectors, excess events split into 'singles' (energy in one sensor only) and 'shared' events (energy in both, absorber-like). The question is whether singles originate in the sensor films (e.g., stress in the superconducting film, quasiparticle bursts) and shared events in the absorber or its mounting, and what fraction of each survives in a stress-free, glue-free mount.
Settled by: Multi-sensor detectors with varied film thickness, film material and mounting, measuring the singles and shared rates and their time dependence separately.
Kind: well-posed
Answer type: classification
References: (empty)
Literature status: partially-resolved
Status note: Anthony-Petersen et al. (Nature Commun. 2024) linked a large part of the shared-event excess in a two-channel Si detector to holder-induced stress; the source of singles and of the remaining shared events is not settled.
Posed since: (empty)