196,556 research outputs found
Preface
No full textPREFACE
The second edition of the International Workshop on “Flavour changing and conserving processes” 2017 (FCCP2017) took place on September 7-9, 2017 in Anacapri, Capri Island, Italy. The Workshop was organized by the Physics Department of the University of Naples “Federico II” and by INFN (Istituto Nazionale di Fisica Nucleare) – Sezione di Napoli. The focus has still been continued on the physics of flavour changing and conserving processes, the involved scientific community has been that of experiments like g−2, Mu2e, MEG, Mu3e, COMET, but also that of the K and B meson physics. More than thirty talks were presented covering the theory status as well as the latest results of experiments in various Laboratories of the world. We wish to thank everybody who contributed to the success of the Workshop. The speakers did an excellent job in presenting the latest results and all participants contributed to the success of the Workshop. We look forward to the next edition FCCP2019 when new results are expected, from many sides, especially on the g-2 FRONT.
Giancarlo D’Ambrosio Michele Iacovacci Massimo Passera Graziano Venanzoni Stefano Mastroianni
Editors FCCP201
Online software time calibration for a continuous air shower array
No full textTime calibration is a crucial item for a shower array performance as it uses the time of flight method to reconstruct the arrival direction of the primary particle. This paper presents a software time calibration algorithm exploiting the continuous detector feature based on the assumption of locally flat shower front. On the small portions of the detector (tens of m2) a simple time-position fit of the arriving particles provides the time calibration constants of that part of detector. Then, a second step is needed to measure the time offset among the different portions obtaining the complete detector calibration. This algorithm is applied to ARGO-YBJ detector with a high trigger rate (several kHz) by means of an online processing and its performance is discussed
Online software time calibration for a continuous air shower array
No full textTime calibration is a crucial item for a shower array performance as it uses the time of flight method to reconstruct the arrival direction of the primary particle. This paper presents a software time calibration algorithm exploiting the continuous detector feature and based on the assumption of locally flat shower front; accordingly, taken a small portion of the detector (tens of ), a simple time-position fi t of the arriving particles provides the time calibration constants of that part of detector. In a second step, the time offsets among the different portions are measured and the complete detector calibration is obtained. The implementation of this algorithm in an online environment like the ARGO-YBJ data acquisition system has been studied. The results of this investigation are reported and discussed
Triggerless DAQ system for a light based detector
No full textThe utilization of various types of photon detectors, generally referred to as light based detectors, is widespread in many fields of high energy physics, nuclear physics, astrophysics and medical imaging to measure scintillation photons or Cherenkov light. Both the traditional photomultiplier tubes (PMTs), still the most commonly used, and the silicon photomultipliers (SiPMs) in rapid development in the last years show good performance. The sensitivity down to single photoelectron (PE), the wide dynamic range and the fast timing characteristics can be exploited thanks to a careful optimization of the readout electronics, trigger and DAQ.
In applications where a high efficiency is required at low energy threshold (as for rare-event search experiments), in a typical trigger-based DAQ architecture, lowering the number of coincident signals for the event selection is mandatory with the consequent heavy increase of data rate that could not be sustained by the DAQ chain.
We have developed a triggerless data collection scheme for a light based detector that relies on a new generation of waveform digitizer board, developed by CAEN and able to manage an independent data acquisition on each channel. This paper describes the implementation and the performance of the triggerless DAQ system
The cosmic ray proton, helium and CNO fluxes in the 100 TeV energy region from TeV muons and EAS atmospheric Cherenkov light observations of MACRO and EAS-TOP
No full textThe primary cosmic ray (CR) proton, helium and CNO fluxes in the energy range 80–300 TeV are studied at the National Gran Sasso Laboratories by means of EAS-TOP (Campo Imperatore, 2005 m a.s.l.) and MACRO (deep underground, 3100 m w.e., the surface energy threshold for a muon reaching the detector being Eth l about 1,3 TeV). By using the measurements of the proton spectrum obtained from the direct experiments and hadron flux data in the atmosphere, we obtain for the relative weights of the three components at 250 TeV: Jp : JHe : JCNO = (0,20 +/- 0,08 ) : (0,58 +/- 0,19) : (0:22 +/- 0:17). This corresponds to the dominance of helium over proton primaries at 100–1000 TeV, and a possible non-negligible contribution from CNO.
The lateral distribution of Cherenkov light in Extensive Air Showers (EASs), which is related to the rate of energy
deposit of the primary in the atmosphere, is measured for a selected proton and helium primary beam, and good
agreement is found when compared with the one calculated with the CORSIKA/QGSJET simulation model
AN INNOVATIVE SYSTEM BASED ON BIOIMPEDANCE MEASUREMENTS TO DEFINE THE BLADDER VOLUME
No full textObjectives: Alteration of the bladder sense of fullness due to spinal cord injury or radical cystectomy leads to the inability to plan micturition timing. The development of a system for the fullness detection would be highly desirable and would enable autonomous and spontaneous management of micturition by the patient. Here the design of an innovative system of bladder volume monitoring based on bioimpedance measurements is presented.
Methods: Bioimpedance measurements are performed on ex-vivo bladder tissue using traditional ECG sensors. Two couples of electrodes in different arrangements were applied on the bladder walls to detect degree of filling by 50ml step, from 0ml to 300ml. The bioimpedance values are obtained for frequencies ranging from 1 kHz to 2 MHz. Moreover, different compositions of artificial urine were tested, by varying relevant ions concentration.
Results: The impedance variations were recorded around 20ohm in average from empty to full status. However, the impedance variation was dependent to ion concentration in urine.
Discussion: The experiment shows the feasibility of this approach and the need to find the sensors arrangement able to normalize measurements with respect to urine composition.
Conclusions: A novel system to detect the bladder filling based on bioimpedence measures is reported. This approach could be feasible both in presence of natural or artificial/reconstructed bladder. Future work will target accurate volume estimation independently on urine composition, as well as combination with other sensing strategies.
Acknowledgements: The authors acknowledge INAIL (Istituto Nazionale Assicurazioni Infortuni sul Lavoro) for providing their collaboration within the BioSUP project
A general estimator of the primary cosmic ray energy with the ARGO-YBJ experiment
No full textThe determination of the primary cosmic ray all-particle spectrum with ground-based air shower
experiments usually depends on the assumed elemental composition and hadronic interaction
model. Here we show that an energy estimator independent of the primary mass composition
can be defined by means of shower parameters measured in the core region, as carried out in
the ARGO-YBJ experiment. The energy resolution is <10% above 100 TeV and gets better with
energy increasing. Being insensitive to the number of muons, this energy determination has only
a weak dependence on the hadronic interaction model. The features of this energy estimator have
been validated by extensive MC simulations and used in the analysis of the ARGO-YBJ data
Spatial correlations applied to gamma/hadron discrimination in the ARGO-YBJ experiment
No full textFollowing recently proposed approaches on gamma/hadron separation, spatial correlations among secondary charged particles in extensive air showers have been studied for the case of the ARGO-YBJ experiment, which represents a particularly suited detector in this respect because of its “continuous-carpet” geometry. Two different types of statistics have been considered, namely the nearest-neighbor spacing distribution (NNSD) and the variance of the number of secondary particles at given distance. The results of this preliminary investigation are reported
CALPRO, an unconventional calorimetry approach
No full textWe propose a calorimetry approach unconventional and innovative. The method is based on the measurement of the lateral distribution of charged particles around the shower axis, it has been used for the first time in the energy determination of Extensive Air Showers at very high energy (>100 TeV) with single layer detector, providing an energy determination with resolution of about 10% for energies above 100 TeV. It has some peculiar characteristics which can be summarized in the following three points: (1) measurement of the shower energy by means of a single sampling; (2) calorimetry which renounces the classic concept of containment of the shower; (3) possibility to separate primary masses. In order to extend this technique at lower energies, specific simulations have been performed through GEANT4 in the energy range 100 GeV–10 TeV for different particles
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