142 research outputs found
Neutrinoless Double Beta Decay Experiments
Neutrinoless double beta decay is the only process known so far able to test
the neutrino intrinsic nature: its experimental observation would imply that
the lepton number is violated by two units and prove that neutrinos have a
Majorana mass components, being their own anti-particle. While several
experiments searching for such a rare decay have been performed in the past, a
new generation of experiments using different isotopes and techniques have
recently released their results or are taking data and will provide new limits,
should no signal be observed, in the next few years to come. The present
contribution reviews the latest public results on double beta decay searches
and gives an overview on the expected sensitivities of the experiments in
construction which will be able to set stronger limits in the near future.Comment: Presented at the 2014 Flavor Physics and CP Violation (FPCP-2014),
Marseille, France, May 26- 30 2014, 11 pages, 2 figure
Observation of neutrino interactions in the OPERA detector
OPERA is a long baseline neutrino oscillation experiment designed to observe
oscillations by looking at the appearance of
's in an almost pure beam. The beam is produced at CERN
and sent towards the Gran Sasso INFN laboratories where the experiment is
running. OPERA started its data taking in October 2007, when the first 38
neutrino interactions where successfully located and reconstructed. This paper
reviews the status of the experiment discussing its physics potential and
performances for neutrino oscillation studies.Comment: 7 pages, 6 figure
Flux Modulations seen by the Muon Veto of the GERDA Experiment
The GERDA experiment at LNGS of INFN is equipped with an active muon veto.
The main part of the system is a water Cherenkov veto with 66~PMTs in the water
tank surrounding the GERDA cryostat. The muon flux recorded by this veto shows
a seasonal modulation. Two effects have been identified which are caused by
secondary muons from the CNGS neutrino beam (2.2 %) and a temperature
modulation of the atmosphere (1.4 %). A mean cosmic muon rate of /(sm) was found in good agreement with other experiments at
LNGS at a depth of 3500~meter water equivalent.Comment: 7 pages, 6 figure
Limit on the Radiative Neutrinoless Double Electron Capture of Ar from GERDA Phase I
Neutrinoless double electron capture is a process that, if detected, would
give evidence of lepton number violation and the Majorana nature of neutrinos.
A search for neutrinoless double electron capture of Ar has been
performed with germanium detectors installed in liquid argon using data from
Phase I of the GERmanium Detector Array (GERDA) experiment at the Gran Sasso
Laboratory of INFN, Italy. No signal was observed and an experimental lower
limit on the half-life of the radiative neutrinoless double electron capture of
Ar was established: 3.6 10 yr at 90 % C.I.Comment: 7 pages, 3 figure
Procedure for short-lived particle detection in the OPERA experiment and its application to charm decays
The OPERA experiment, designed to perform the first observation of oscillations in appearance mode through the detection of
the leptons produced in charged current interactions, has
collected data from 2008 to 2012. In the present paper, the procedure developed
to detect particle decays, occurring over distances of the order of 1 mm
from the neutrino interaction point, is described in detail. The results of its
application to the search for charmed hadrons are then presented as a
validation of the methods for appearance detection
Check on the features of potted 20-inch PMTs with 1F3 electronics prototype at Pan-Asia
The Jiangmen underground neutrino observatory (JUNO) is a neutrino project
with a 20-kton liquid scintillator detector located at 700-m underground. The
large 20-inch PMTs are one of the crucial components of the JUNO experiment
aiming to precision neutrino measurements with better than 3% energy resolution
at 1 MeV. The excellent energy resolution and a large fiducial volume provide
many exciting opportunities for addressing important topics in neutrino and
astro-particle physics. With the container #D at JUNO Pan-Asia PMT testing and
potting station, the features of waterproof potted 20-inch PMTs were measured
with JUNO 1F3 electronics prototype in waveform and charge, which are valuable
for better understanding on the performance of the waterproof potted PMTs and
the JUNO 1F3 electronics. In this paper, basic features of JUNO 1F3 electronics
prototype run at Pan-Asia will be introduced, followed by an analysis of the
waterproof potted 20-inch PMTs and a comparison with the results from
commercial electronics used by the container #A and #B
Angular and Current-Target Correlations in Deep Inelastic Scattering at HERA
Correlations between charged particles in deep inelastic ep scattering have
been studied in the Breit frame with the ZEUS detector at HERA using an
integrated luminosity of 6.4 pb-1. Short-range correlations are analysed in
terms of the angular separation between current-region particles within a cone
centred around the virtual photon axis. Long-range correlations between the
current and target regions have also been measured. The data support
predictions for the scaling behaviour of the angular correlations at high Q2
and for anti-correlations between the current and target regions over a large
range in Q2 and in the Bjorken scaling variable x. Analytic QCD calculations
and Monte Carlo models correctly describe the trends of the data at high Q2,
but show quantitative discrepancies. The data show differences between the
correlations in deep inelastic scattering and e+e- annihilation.Comment: 26 pages including 10 figures (submitted to Eur. J. Phys. C
Implementation and performances of the IPbus protocol for the JUNO Large-PMT readout electronics
The Jiangmen Underground Neutrino Observatory (JUNO) is a large neutrino
detector currently under construction in China. Thanks to the tight
requirements on its optical and radio-purity properties, it will be able to
perform leading measurements detecting terrestrial and astrophysical neutrinos
in a wide energy range from tens of keV to hundreds of MeV. A key requirement
for the success of the experiment is an unprecedented 3% energy resolution,
guaranteed by its large active mass (20 kton) and the use of more than 20,000
20-inch photo-multiplier tubes (PMTs) acquired by high-speed, high-resolution
sampling electronics located very close to the PMTs. As the Front-End and
Read-Out electronics is expected to continuously run underwater for 30 years, a
reliable readout acquisition system capable of handling the timestamped data
stream coming from the Large-PMTs and permitting to simultaneously monitor and
operate remotely the inaccessible electronics had to be developed. In this
contribution, the firmware and hardware implementation of the IPbus based
readout protocol will be presented, together with the performances measured on
final modules during the mass production of the electronics
Mass testing of the JUNO experiment 20-inch PMTs readout electronics
The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose,
large size, liquid scintillator experiment under construction in China. JUNO
will perform leading measurements detecting neutrinos from different sources
(reactor, terrestrial and astrophysical neutrinos) covering a wide energy range
(from 200 keV to several GeV). This paper focuses on the design and development
of a test protocol for the 20-inch PMT underwater readout electronics,
performed in parallel to the mass production line. In a time period of about
ten months, a total number of 6950 electronic boards were tested with an
acceptance yield of 99.1%
Validation and integration tests of the JUNO 20-inch PMTs readout electronics
The Jiangmen Underground Neutrino Observatory (JUNO) is a large neutrino
detector currently under construction in China. JUNO will be able to study the
neutrino mass ordering and to perform leading measurements detecting
terrestrial and astrophysical neutrinos in a wide energy range, spanning from
200 keV to several GeV. Given the ambitious physics goals of JUNO, the
electronic system has to meet specific tight requirements, and a thorough
characterization is required. The present paper describes the tests performed
on the readout modules to measure their performances.Comment: 20 pages, 13 figure
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