Study of the GERDA Phase II background spectrum.

D'Andrea V.
  Mercoledì 28/09   16:30 - 19:00   Edificio Psicologia 2 - Aula 2E   III - Astrofisica
The GErmanium Detector Array (Gerda) experiment, located at the Laboratori Nazionali del Gran Sasso, searches for the $0\nu\beta\beta$ decay of ${}^{76}Ge$. GERDA Phase II was started in December 2015, aiming to reach a sensitivity on the $0\nu\beta\beta$ decay half-life larger than $10^{26}$ yr in three years of data taking with about $100 kg\cdot yr$ exposure with background index of about $10^{-3} cts/(keV\cdot kg\cdot yr)$. To reach these goals the stability, and both the energy and the pulse shape resolutions must be optimal. In this work a study of the Gerda background spectrum will be presented: the main spectral structures $(2\nu\beta\beta$ decay, $\gamma$ and $\alpha$ structures) will be discussed and related to the background sources.