Speaker
Description
Americium-Beryllium (AmBe) is a typical source to be use for a calibration of neutron detection efficiency in underground astroparticle experiments. It has been considered to emit a neutron and 4.4 MeV gamma ray simultaneously, which allows us to select events with a neutron by tagging the 4.4 MeV gamma-ray signal. This time, we focus on the higher energy component around 5-10 MeV in a deposited energy distribution,under the measurement with inorganic scintillators. Any component hidden under the 4.4 MeV peak could be counted with no neutron emission in the tagging events. We aim to understand the breakdown of the continuous component from the AmBe source to contribute reduction of a systematic uncertainty related to the neutron detection efficiency for the astroparticle physics. We will present a result of measurements for neutrons and gamma rays using NaI(Tl) and liquid scintillation detectors.
