M. Fusco Girard

A study of the multigap RPC at the gamma irradiation facility at CERN

Abstract The selected device for the ALICE Time-of-Flight array is the Multigap Resistive Plate Chamber (MRPC). We have tested this device at the Gamma Irradiation Facility at CERN to evaluate the rate dependence. We find that the rate capability of the MRPC easily exceeds the 50 Hz/cm 2 maximum expected rate at the ALICE experiment. In addition, we have measured the power dissipated for an equivalent flux of 1.6 kHz/cm 2 of through-going muons to be 650 mW/m 2 .

Lyapunov exponents for the n =3 discrete self-trapping equation

Abstract Lyapunov characteristic exponents for the n = 3 discrete self-trapping equation are numerically computed and the connection between the vanishing ones and the existence of independent constants of motion is exhibited. The results obtained by this approach are in agreement with previous ones about the long-term behaviour of the system.

Numerical evidence of a sharp order window

Abstract A detailed numerical analysis for a small range of the nonlinearity parameter exhibits the existence of a sharp order window for the n = 3 discrete self-trapping equation. The analysis performed by using maximum Lyapunov characteristic exponent, power spectra, Poincare maps and correlation exponents gives a clear-cut evidence of a biperiodic dynamics on bidimensional tori.

Results of the ALICE time-of-flight detector from the 2009 cosmic-ray data taking

The Time-Of-Flight detector (TOF) of the ALICE experiment at the CERN LHC is based on Multi-gap Resistive Plate Chambers (MRPCs). The TOF detector consists of 152928 readout channels covering a total area of 141 m2. In this paper the results of the calibration with cosmic-ray data collected during 2009 are presented.

Surface effects in type-II superconductors

Abstract The electromagnetic structure of a quantized flux line is investigated, in the framework of the boson transformation method, for the cases of a semi-infinite superconductor and of a superconducting film of arbitrary thickness. The vortex-antivortex interaction energy is also computed. Comparison with previous results is given.

Some remarks about surface effects in magnetic superconductors

Abstract A new choice for the boson transformation function is employed for the study of the electromagnetic-field distributions at the interface of vacuum with a magnetic superconductor. The relation with previous approaches is discussed.

Multiplicity studies and effective energy in ALICE at the LHC

In this work we explore the possibility to perform “effective energy” studies in very high energy collisions at the CERN large hadron collider (LHC). In particular, we focus on the possibility to measure in pp collisions the average charged multiplicity as a function of the effective energy with the ALICE experiment, using its capability to measure the energy of the leading baryons with the zero degree calorimeters. Analyses of this kind have been done at lower centre-of-mass energies and have shown that, once the appropriate kinematic variables are chosen, particle production is characterized by universal properties: no matter the nature of the interacting particles, the final states have identical features. Assuming that this universality picture can be extended to ion–ion collisions, as suggested by recent results from RHIC experiments, a novel approach based on the scaling hypothesis for limiting fragmentation has been used to derive the expected charged event multiplicity in AA interactions at LHC. This leads to scenarios where the multiplicity is significantly lower compared to most of the predictions from the models currently used to describe high energy AA collisions. A mean charged multiplicity of about 1000–2000 per rapidity unit (at η∼0) is expected for the most central Pb–Pb collisions at

The highest precision proof of CPT invariance in the “nuclear binding masses”

\sqrt{s_{{\text{NN}}}} = 5.5\,\text{TeV}

Nonperturbative vertex corrections for superconductivity in the Frohlich model

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WKB wave functions for a nonseparable Hamiltonian

The validity of CPT invariance in the field of “nuclear binding masses” has been studied for nuclei (antinuclei) with two and three nucleons (antinucleons): (d∕d) and (3He∕3He¯). It is discussed the importance of investigating the transition from the world where gluons and quarks carry their QCD colors (QGCW) to the world where gluons and quarks exist only with zero-QCD-color (QGZCW).