Collection of Athermal Phonons into Doped Germanium Thermistors Using Quasiparticle Trapping
American Institute of Physics
We have developed a low‐temperature particle detector that uses a novel quasiparticle trapping mechanism to funnel athermal phonon energy from an 80 mg Ge absorber into a 1.6 mg doped Ge thermistor via a superconducting Al film. We report on pulse height spectra obtained at 320 mK by scanning a 241Am alpha source along the device, and show that up to 20% of the energy deposited in the Ge absorber by a 5.5 MeV alpha particle interaction can be collected into a thermistor via quasiparticle trapping. We show that this device is sensitive to the position of an alpha particle interaction in the Ge absorber for interaction distances of up to 5 mm from a quasiparticle trap.
Grannan, S. M., Young, B. A., Lange, A. E., Labov, S., Sadoulet, B., Emes, J., & Haller, E. E. (1995). Collection of athermal phonons into doped Ge thermistors using quasiparticle trapping. Journal of Applied Physics, 77(10), 4887–4891. https://doi.org/10.1063/1.359292