Ricerc@Sapienza

The CERN Proton Synchrotron (PS) routinely crosses transition energy at around 6 GeV in order to accelerate protons that are injected in the Super Proton Synchrotron (SPS) or transferred to users of fixed target experiments. Depending on the beam parameters and intensity, a fast vertical coherent instability occurs during transition crossing.

The first measurement of the lifetime of the doubly charmed baryon ?cc++ is presented, with the signal reconstructed in the final state ?c+K-?+?+. The data sample used corresponds to an integrated luminosity of 1.7 fb-1, collected by the LHCb experiment in proton-proton collisions at a center-of-mass energy of 13 TeV. The ?cc++ lifetime is measured to be 0.256-0.022+0.024(stat)±0.014(syst) ps.

Plasma-based acceleration has already proved the ability to reach ultra-high accelerating gradients. However
the step towards the realization of a plasma-based accelerator still requires some e
ff ort to guarantee high brightness beams, stability and reliability. A significant improvement in the efficiency of PWFA has been
demonstrated so far accelerating a witness bunch in the wake of a higher charge driver bunch. The transformer
ratio, therefore the energy transfer from the driver to the witness beam, can be increased by resonantly exciting

In Particle Therapy, cancer treatments are performed using accelerated charged particles whose high irradiation precision and conformity permit to destroy the tumour while sparing the surrounding healthy tissues. Several secondary particles are produced during the treatments mainly photons, protons and neutrons. The reduced attenuation length of neutrons yields a secondary particle sample that is larger in number when compared to photons and charged particles.

We have measured the running of the effective QED coupling constant ?(s)?(s) in the time-like region View the MathML source0.6

GEM-based detectors had a noticeable development
in last years and have successfully been employed in different
fields from High Energy Physics to imaging applications. Light
production associated to the electron multiplication allows to
perform an optical readout of these devices. The big progress
achieved in CMOS-based photo-sensors makes possible to develop
a high sensitivity, high granularity and low noise readout. In this
paper we present the results obtained by reading out the light
produced by a triple-GEM structure by means o

During Particle Therapy treatments the patient irradiation produces, among different types of secondary radiation, an abundant flux of neutrons that can release a significant dose far away from the tumour region. A precise measurement of their flux, energy and angle distributions is eagerly needed in order to improve the Treatment Planning Systems software and to properly take into account the risk of late complications in the whole body.