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The innovative design of the PANDA Barrel DIRC
Get PDFThe Barrel DIRC of the PANDA experiment at FAIR will cleanly separate pions from kaons for the physics program of PANDA. Innovative solutions for key components of the detector sitting in the strong magnetic field of the compact PANDA target spectrometer as well as two reconstruction methods were developed in an extensive prototype program. The technical design and present results from the test beam campaigns at the CERN PS in 2017 and 2018 are discussed
Perspectives of QCD phase diagram studies at high densities with the Compressed Baryonic Matter experiment at FAIR
Get PDFThe future heavy-ion experiment CBM at FAIR will operate at unprecedented interaction rates in the region of the high net baryon densities. This will provide a unique opportunity to study extremely rare probes thus increasing the sensitivity to the processes taking place in the created QCD matter. The ambitious goals of the experiment will require novel solutions in hardware, reconstruction algorithms, and their software implementation, which are currently being developed: free streaming readout electronics without hardware trigger and full event reconstruction already at the selection stage. The feasibility studies show a great potential of CBM to explore the QCD phase diagram
Looking for non-statistical effects in the decay of 36,37Ar∗: First results
Get PDFThe system 24Mg+12,13C at an energy of 162 and 142 MeV respectively has been investigated with the GARFIELD and RingCounter detectors at LNL. Thanks to their large coverage and their good identification capability, it is possible to obtain a clean data set where the total charge of exited 36,37Ar∗ compound nucleus is detected. The experimental data are compared with simulated events using the standard GEMINI++ statistical code
Nuclear astrophysics at the n TOF facility: Some key cases in low mass star evolution and Neutron Star Mergers
Get PDFNuclear astrophysics is an interdisciplinary field at the crossing of various branches, from experimental and theoretical studies of nuclear cross sections to stellar evolutionary models of high complexity. The physics of stellar interiors can be constrained only if the adopted inputs in stellar modelling are known with high accuracy. For the nucleosynthesis of heavy elements, neutron capture and neutron induced fission cross sections are among the major sources of uncertainty and, thus, any improvement in their estimates represents a progress toward a better
comprehension of stellar processes. Here I will present an astrophysicist perspective on some measurements carried out at the n TOF facility at CERN. I will discuss some cases related to the slow neutron capture process (the s-process) and to the rapid neutron capture process (the r-process)
Nuclear force studies in the proton-deuteron break-up channel at 135 MeV
Get PDFIn this contribution, vector analyzing powers, Ax and Ay, are presented for the proton-deuteron break-up reaction studied using a polarised-proton beam at 135 MeV impinging on a liquid-deuterium target. For the experiment we used the Big Instrument for Nuclear-polarisation Analysis (BINA) at KVI, the Netherlands. With this setup, we expanded our measurements of analyzing powers compared to earlier published result (Kalantar-Nayestanaki N. et al., Rep. Prog. Phys. 75 (2012)). In particular, we determined, for the first time, Ax for a large range in the kinematical S, polar and azimuthal angles of the two outgoing protons. Analyzing power data are compared to predictions from Faddeev calculations. Our data are reasonably well described by calculations for kinematical configurations at which the three-nucleon force effect is predicted to be small. However, striking discrepancies are observed at specific configurations, in particular in cases where the relative azimuthal angle between the two protons becomes small. In this contribution, some of these configurations along with the analysis techniques will be presented
Isomers production in 238U photofission
Get PDFThe fission process induced by gamma quanta up to 25 MeV energy on 238U was analyzed. Experimental observables as cross sections, fragments mass distribution yields of some nuclides of interest and average prompt neutrons multiplicity characterizing 238U photofission process were theoretically evaluated using TALYS 1.9 software. Theoretical evaluations of isomer ratios using Talys supplied by author’s own code as well as experimental isomer ratios obtained at MT - 25
Microtron are presented
Modelling radiation damage effects to pixel sensors for the ATLAS Detector
Get PDFSilicon pixel sensors are at the core of the current ATLAS detector at the Large Hadron Collider (LHC), and as the detector component closest to the interaction point, they are exposed to a significant amount of radiation during
operation. This paper presents a digitization model incorporating radiation damage effects to the pixel sensors. Predictions for basic pixel cluster properties such as
the charge collection efficiency are also presented alongside validation studies with Run 2 collision data in the ATLAS Pixel Detector
The analysis strategy of the PADME experiment searching for invisible decays of the dark photon
Get PDFPADME at the Beam Test Facility of the DAΦNE accelerator complex at the Laboratori Nazionali di Frascati of INFN is a new experiment looking for the gauge boson A of a U(1) symmetry holding in a secluded sector and acting as a portal between the Standard Model and the new sector. The experiment will start its data taking this year. The results of a recent study of the data analysis strategy, based on a realistic simulation of the apparatus, is summarised in this work
Measurements of top-quark pair differential cross-sections using the ATLAS detector at LHC
Get PDFThe measurements of cross-sections of the top-quark pair production provide an ideal way to perform stringent tests of the predictions of the perturbative Quantum Chromodynamics. In addition, they are sensitive to the parton distribution functions of the proton. This contribution shows the measurements in the semi-leptonic channel, using the data sample collected by the ATLAS experiment at the Large Hadron Collider during Run-2 at a centre-of-mass energy of 13 TeV, either by applying an inclusive selection or by using an exclusive selection as a function of the multiplicity of the hadronic jets. The measurements cover a wide kinematic region reaching the boosted regime, in which the values of the transverse momentum of the top quark are greater than 400 GeV. The results are compared with the most recent theoretical predictions
Recent analysis of the Borexino experiment: pp chain solar neutrino spectroscopy
Get PDFBorexino is a large liquid-scintillator detector with unprecedented intrinsic radiopurity levels, located at the LNGS laboratory in Italy. Its primary goal is to perform a real-time solar neutrinos spectroscopy. The main procedures
for the solar neutrino analysis of Borexino Phase-II data (2011–2016) are briefly described