Author:
Sato Hikaru,Kin Tadahiro,Giammanco Andrea
Abstract
Abstract
Recent applications of cosmic-ray muons require accurate
modeling of their flux at low energy. However, only a few
measurements have been reported below 400 MeV. Therefore, we
developed a full-absorption muon energy spectrometer (FAMES) to obtain
energy differential flux below 400 MeV. Because our main detector
can measure muon energies below 75 MeV, an energy degradation
method is adopted (using 5- and 20-cm thick lead blocks) to shift
the sensitive energy range. Three measurements were performed (in
the normal mode and the two energy degrading modes) for around two
weeks. The measurement results were compared with PARMA, an
analytical model for estimating terrestrial cosmic-ray fluxes nearly
anytime and anywhere in the world. As a result, we found that the
model can precisely predict the flux except its lower energy part.
Subject
Mathematical Physics,Instrumentation