Author:
Sogarwal Hariom,Shukla Prashant
Abstract
Abstract
Measurements of cosmogenic particles at various locations and altitudes are
becoming increasingly important in view of worldwide interests in rare signals for search of new
physics.
In this work, we report measurement of muon zenith angle distributions and
vertical
flux using a portable setup of four one-meter long liquid scintillator bars.
Each scintillator bar is read out from both sides via photomultiplier tubes followed
by an 8-channel Digitizer. We exploit energy deposition and excellent timing of scintillators to construct two
dimensional tracks and hence angles of charged particles. We use liquid scintillators since they
have an added advantage of pulse shape discrimination (PSD) which can be used for detecting
muon induced particles.
The energy deposition, time window of event and PSD cuts are used to reduce the random as well as
correlated backgrounds. In addition, we propose three track quality parameters which are applied
to obtain a clean muon spectrum.
The zenith angle measurement is performed upto 60°.
With our improved analysis, we demonstrate that a setup of 3 bars can also be
used for quicker and precise measurements.
The vertical muon flux measured is 66.70 ± 0.36 ± 1.50 /m2/sr/s with n = 2.10 ± 0.05 ± 0.25
in cos
n
θ at the location of Mumbai, India (19°N, 72.9°E) at Sea
level with a muon momentum above 255 MeV/c.
The muon flux has dependence on various factors, the most prominents are latitudes, altitudes
and momentum cut of muon so that portable setup like this can be a boon for such
measurements at various locations.
Subject
Astronomy and Astrophysics
Cited by
3 articles.
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