To the Editor: The SARS-CoV-2 pandemic has created unprecedented challenges for low- and middle-income countries (LMICs) in which health systems are profoundly under-resourced.1 In sub- Saharan ...Africa, the doctor-to-patient ratio is 0.22 per 1 000 compared with 3.57 in Europe and 2.59 in North America.2 In the context of limited supplies and staff along with a predicted increase in SARSCoV- 2 cases, innovation is required. Effective measures to sterilise personal protective equipment (PPE) have been demonstrated, but data are sparse on decreasing contact with infectious droplets in LMICs.3,4 In an attempt to address the shortfall of PPE and allow limited re-use, the SAMPLAR (safe, affordable, multipurpose, light, aerosol-reducing) box was developed for use in paediatric settings to protect personnel through a costeffective, partially negative pressure environment.
We report an early result from the ICARUS experiment on the search for a
ν
μ
→
ν
e
signal due to the LSND anomaly. The search was performed with the ICARUS T600 detector located at the Gran Sasso ...Laboratory, receiving CNGS neutrinos from CERN at an average energy of about 20 GeV, after a flight path of ∼730 km. The LSND anomaly would manifest as an excess of
ν
e
events, characterized by a fast energy oscillation averaging approximately to
with probability
. The present analysis is based on 1091 neutrino events, which are about 50 % of the ICARUS data collected in 2010–2011. Two clear
ν
e
events have been found, compared with the expectation of 3.7±0.6 events from conventional sources. Within the range of our observations, this result is compatible with the absence of a LSND anomaly. At 90 % and 99 % confidence levels the limits of 3.4 and 7.3 events corresponding to oscillation probabilities
and
are set respectively. The result strongly limits the window of open options for the LSND anomaly to a narrow region around (Δ
m
2
,sin
2
(2
θ
))
new
=(0.5 eV
2
,0.005), where there is an overall agreement (90 % CL) between the present ICARUS limit, the published limits of KARMEN and the published positive signals of LSND and MiniBooNE Collaborations.
In the last 30 years, the incredible experimental progress made in the studies of neutrino oscillation allowed to better understand the pattern of neutrino masses and neutrinos mixing. However, ...further investigation are necessary, in particular concerning a series of experimental anomalies, observed in different neutrino experiments, which are uncorrelated with each other but all hinting at oscillation phenomena. The goal of the new Short Baseline Neutrino program is to perform sensitive searches for νe appearance and νμ disappearance in the Booster Neutrino Beam in order to understand experimental anomalies in neutrino physics and to perform the most sensitive search for sterile neutrinos at the eV mass-scale. The experiment includes three Liquid Argon Time Projection Chamber detectors located along the Booster Neutrino Beam line at Fermilab. In this paper, the functioning of the Short Baseline Neutrino far detector, ICARUS-T600, is shown. In particular, this work is focused on the detector light collection system and on its upgrade concerning the wavelength shifting of the liquid argon scintillation from vacuum ultra-violet into visible light.
The idea of the CHNET-TANDEM experiment is to develop and optimize a non-destructive technique, which allows analysis deep inside the sample with a good spatial resolution, using a negative muon ...beam. By selecting the primary muon energies appropriately, bulk analysis can be performed without destructing the sample. The experimental setup used for this experiment, made by 2 hodoscopes and 5 HpGe, allowed us to collect very interesting preliminary data concerning scan momentum, positioning and centering of the samples by means of two hodoscopes, analysis of standard material targets and elemental characterization of Nuragic “Bronze Age” votive ship fragments.
A high resolution Timing Counter for the MEG II experiment De Gerone, M.; Bevilacqua, A.; Biasotti, M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
07/2016, Letnik:
824
Journal Article
Recenzirano
The development of a Timing Counter detector designed for the MEGII upgrade of the MEG experiment, which strives to improve the sensitivity on the μ+→e+γ decay of an order of magnitude, is presented. ...It is based on two sets of counters (sectors) arranged on a semi-cylindrical structure; each sector consists of 256 counters. Each counter consists of tile of fast scintillator with a dual-side read-out based on SiPM arrays in series connection. The high granularity has two advantages: optimized size for achieving high resolution (75ps) for the single counter, and a signal e+ crosses several counters, so that resolution improves by averaging multiple time measurements. A prototype has been built and tested both in BTF and PSI facilities in order to prove the multi-hit scheme in MEG-like beam conditions. A 35ps resolution with eight hits has been obtained with a e+ beam at 100kHz. The first sector will be tested in the MEG II pre-engineering run planned at the end of 2015.
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