Author:
Hu J.W.,Yang L.T.,Yue Q.,Geng X.P.,Li H.B.,Liang Y.F.,Lin S.T.,Liu S.K.,Ma H.,Wang L.,Wong H.T.,Zhang B.T.
Abstract
Abstract
Low-energy background through Compton scattering from the
ambient γ rays can be contaminated in direct dark matter
search experiments. In this paper, we report comparable measurements
on low-energy spectra via Compton scattering from several
γ-ray sources with a p-type point-contact germanium
detector. The spectra between 500 eV and 18 keV have been measured
and analyzed. Moreover, the features of the electron binding effect,
particularly at the edges of the K- and L-shells in the germanium
atom, were observed with different gamma sources and were consistent
with the models in the Geant4 simulation. An empirical background
model is proposed that provides insights into understanding the
low-energy background in germanium for direct dark matter
experiments.
Subject
Mathematical Physics,Instrumentation