3,262 research outputs found
Measurement of cosmogenic Li and He production rates at RENO
We report the measured production rates of unstable isotopes Li and
He produced by cosmic muon spallation on C using two identical
detectors of the RENO experiment. Their beta-decays accompanied by a neutron
make a significant contribution to backgrounds of reactor antineutrino events
in precise determination of the smallest neutrino mixing angle. The mean muon
energy of its near (far) detector with an overburden of 120 (450) m.w.e. is
estimated as 33.1 +- 2.3 (73.6 +- 4.4) GeV. Based on roughly 3100 days of data,
the cosmogenic production rate of Li (He) isotope is measured to be
44.2 +- 3.1 (10.6 +- 7.4) per day at near detector and 10.0 +- 1.1 (2.1 +- 1.5)
per day at far detector. This corresponds to yields of Li (He), 4.80 +-
0.36 (1.15 +- 0.81) and 9.9 +- 1.1 (2.1 +- 1.5) at near and far detectors,
respectively, in a unit of 10 g cm. Combining
the measured Li yields with other available underground measurements, an
excellent power-law relationship of the yield with respect to the mean muon
energy is found to have an exponent of = 0.76 +- 0.05.Comment: 11 pages, 14 figure
Characterization of the correlated background for a sterile neutrino search using the first dataset of the JSNS experiment
JSNS (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source)
is an experiment that is searching for sterile neutrinos via the observation of
appearance oscillations using muon
decay-at-rest neutrinos. Before dedicated data taking in the first-half of
2021, we performed a commissioning run for 10 days in June 2020. Using the data
obtained in this commissioning run, in this paper, we present an estimate of
the correlated background which imitates the signal in a
sterile neutrino search. In addition, in order to demonstrate future prospects
of the JSNS experiment, possible pulse shape discrimination improvements
towards reducing cosmic ray induced fast neutron background are described.Comment: 7 pages, 3 figure
The acrylic vessel for JSNS-II neutrino target
The JSNS (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron
Source) is an experiment designed for the search for sterile neutrinos. The
experiment is currently at the stage of the second phase named JSNS-II
with two detectors at near and far locations from the neutrino source. One of
the key components of the experiment is an acrylic vessel, that is used for the
target volume for the detection of the anti-neutrinos. The specifications,
design, and measured properties of the acrylic vessel are described
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