Advances in High Energy Physics (Jan 2015)

A CaMoO4 Crystal Low Temperature Detector for the AMoRE Neutrinoless Double Beta Decay Search

  • G. B. Kim,
  • S. Choi,
  • F. A. Danevich,
  • A. Fleischmann,
  • C. S. Kang,
  • H. J. Kim,
  • S. R. Kim,
  • Y. D. Kim,
  • Y. H. Kim,
  • V. A. Kornoukhov,
  • H. J. Lee,
  • J. H. Lee,
  • M. K. Lee,
  • S. J. Lee,
  • J. H. So,
  • W. S. Yoon

DOI
https://doi.org/10.1155/2015/817530
Journal volume & issue
Vol. 2015

Abstract

Read online

We report the development of a CaMoO4 crystal low temperature detector for the AMoRE neutrinoless double beta decay (0νββ) search experiment. The prototype detector cell was composed of a 216 g CaMoO4 crystal and a metallic magnetic calorimeter. An overground measurement demonstrated FWHM resolution of 6–11 keV for full absorption gamma peaks. Pulse shape discrimination was clearly demonstrated in the phonon signals, and 7.6 σ of discrimination power was found for the α and β/γ separation. The phonon signals showed rise-times of about 1 ms. It is expected that the relatively fast rise-time will increase the rejection efficiency of two-neutrino double beta decay pile-up events which can be one of the major background sources in 0νββ searches.