Status and perspectives of the 4 pi charged particles multidetector CHIMERA

The construction of the multidetector CHIMERA designed to detect and identify charged particles and fragments emitted in heavy ion reactions at intermediate energy is in progress and is coming to an end. The construction of this multidetector is presented in this paper as well as the status of the project

Highly-parallelized simulation of a pixelated LArTPC on a GPU

The rapid development of general-purpose computing on graphics processing units (GPGPU) is allowing the implementation of highly-parallelized Monte Carlo simulation chains for particle physics experiments. This technique is particularly suitable for the simulation of a pixelated charge readout for time projection chambers, given the large number of channels that this technology employs. Here we present the first implementation of a full microphysical simulator of a liquid argon time projection chamber (LArTPC) equipped with light readout and pixelated charge readout, developed for the DUNE Near Detector. The software is implemented with an end-to-end set of GPU-optimized algorithms. The algorithms have been written in Python and translated into CUDA kernels using Numba, a just-in-time compiler for a subset of Python and NumPy instructions. The GPU implementation achieves a speed up of four orders of magnitude compared with the equivalent CPU version. The simulation of the current induced on 10^3 pixels takes around 1 ms on the GPU, compared with approximately 10 s on the CPU. The results of the simulation are compared against data from a pixel-readout LArTPC prototype

Long-Baseline Neutrino Facility (LBNF) and Deep Underground Neutrino Experiment (DUNE) Conceptual Design Report Volume 2: The Physics Program for DUNE at LBNF

The Physics Program for the Deep Underground Neutrino Experiment (DUNE) at the Fermilab Long-Baseline Neutrino Facility (LBNF) is described

Chimera: rivelatore a 4π4\pi per lo studio di reazioni tra ioni presentati ad energie intermedie

Chimera is a $4\pi$ detector designed for heavy-ion reactions studies at intermediate energy. The characteristics of such device to be pointed out are the high granularity, the large angular covering and the low identification threshold due to the Tof technique facility. These features make Chimera complementary and, under some aspects, competitive with the more performant detectors for heavy ion physics at intermediate energy currently in use in the field of the fundamental nuclear physics research

Recent results from GRAAL

PHASEA polarised and tagged $\vec \gamma$ ray beam is produced at GRAAL by the Compton scattering of laser light on the high energy electron of the ESRF storage ring. We present results on the beam polarisation asymmetries and cross sections in the photoproduction of mesons on hydrogen and deuterium target in the energy region 500-1500 MeV. These very precise results cover the angular range 30°-150°, providing stringent constraints to theoretical models

Compton scattering of polarized photons on the proton at GRAAL

PHASECompton scattering of polarized photons on the proton has been investigated in the energy range 0.8-1.5 GeV, where the non-resonance double-pion photoproduction and the excitations of high baryon resonances play an important role among the photoabsorption mechanisms. Data have been collected by the GRAAL facility, whose polarized photon beam is obtained by the backward scattering of laser light onto the ultrarelativistic electrons circulating in the Grenoble's ESRF storage ring. The main background contribution is due to the in-flight decay of $\pi^0$ where the two photons are emitted with a small opening angle. We present some preliminary results about the method for the separation of Compton scattering events from the aforesaid background

Compton scattering of polarized photons on the proton at GRAAL

PHASECompton scattering of polarized photons on the proton has been investigated in the energy range 0.8-1.5 GeV, where the non-resonance double-pion photoproduction and the excitations of high baryon resonances play an important role among the photoabsorption mechanisms. Data have been collected by the GRAAL facility, whose polarized photon beam is obtained by the backward scattering of laser light onto the ultrarelativistic electrons circulating in the Grenoble's ESRF storage ring. The main background contribution is due to the in-flight decay of $\pi^0$ where the two photons are emitted with a small opening angle. We present some preliminary results about the method for the separation of Compton scattering events from the aforesaid background