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Octupole correlations in the N = 56 neutron-deficient 110Xe
No full textThe neutron-deficient xenon isotopes have proved to be a good test bench to study octupole correlations. Nuclei around N = Z = 56, like 110Xe, are indeed expected to show some of the largest octupole correlations in the whole Segr´e chart. An experiment aimed at studying the octupole correlations in the very exotic 110Xe was performed in Jyv¨askyl¨a, using the γ-ray detector array JUROGAM III coupled to the MARA separator. In this contribution, the preliminary results of the ongoing analysis will be presented
Magnetic field screening in strong crossed electromagnetic fields
No full textThe gravitomagnetic interaction of a rotating black hole (BH) with a surrounding magnetic field, aligned and parallel to the BH axis, leads to an electric field with strength proportional to the magnetic field. Here, we study the magnetic field screening process in proportional electric and magnetic fields, operated by the combination of the motion of a huge number of electron-positron pairs, the
production of synchrotron photons by the pairs, and the magnetic pair production process. We simulate this process for an initial magnetic field of the order of 1012 G and a seed of 1010 pairs. We obtain a reduction of the magnetic field strength of a few percent in a timescale shorter than femtoseconds. These results might have consequences on the high-energy (GeV) emission of astrophysical systems like gamma-ray bursts (GRBs). The reduction of the magnetic field strength implies a less efficient magnetic pair production, increasing the probability of GeV photons to leave the system
Modeling of the GERDA data after the upgrade
No full textGERDA was an experiment at the Gran Sasso underground laboratories searching for neutrinoless double-beta decay of 76Ge. During 2018 the apparatus was upgraded, introducing possible new sources of contamination. A background model of the full-range energy spectrum acquired by germanium detectors before applying high level cuts (Pulse Shape Discrimination and LAr veto) after the upgrade is reported. From this analysis it is possible to understand the origin
of the collected events, make a precise measurement of the half-life of the Standard Model allowed two neutrino decay mode and obtain information about the purity of the materials for future experiments’ strategies
Intracavity feedback optical trapping
No full textSeveral research groups have integrated feedback control with optical trapping to improve performance, e.g., for force or position control. Among the different proposed approaches, using the feedback when trapping inside a laser
cavity stands out for several reasons, namely, trapping can occur at lower optical intensities, reducing photodamage, and with low numerical aperture lenses, simplifying setup design. This is possible because the trapped particle position alters the cavity losses, triggering an intrinsic feedback on the trapped particle. Here, we analyze the behaviour of intracavity optical trapping with a single beam and with counter-propagating beams. The single-beam configuration features a well-known nonlinear feedback effect, because the beam power changes as the square of the particle displacement from trapping position. Instead, the counter-propagating-beam configuration feedback effect acts on both beams and can not be described by the same model
Modelling seismic wavefield across the southern Tyrrhenian Sea
No full textThe Italian peninsula and the Tyrrhenian Sea are the ideal regions to explore the potential of wavefield modelling in a mixed continental-oceanic crust through finite-difference based simulations. In these structural settings, we show
that such modelling can discriminate reverberating crustal waves created between layers from the average stochastic properties of the crust. This framework provides a novel forward model to image oceanic basins in 3D while constraining Moho depths
Smartphone experiments to study the radiation of a black body in a remote laboratory
No full textIn this article we present an experimental setup consisting of a smartphone and a simple home kit to study the law of thermal radiation of an incandescent light bulb. The measurement of the filament temperature is obtained
indirectly from the temperature dependency of the resistivity. The light sensor of the smartphone is used to measure light intensity. By analysing the graph of the
dependence of light intensity on the inverse of temperature, in the limit of the Wien approximation of the Planck distribution, it is possible to obtain an estimation of the spectral response of the sensor or, alternatively, if this is known, an estimation of Planck’s constant
Analisi delle assenze e presenze del personale dell’Istituto di Scienze Marine CNR-ISMAR - Sede secondaria di Napoli
Get PDFNel documento sono riportati i risultati delle analisi delle presenze/assenze, relative all’anno 2021, per la Sede di Napoli dell’Istituto di Scienze Marine (ISMAR-CNR)
Study of Λ baryon polarization in Ξ0 c → ΛK−π+ decays
No full textThis work reports on a study of the polarization of Λ baryons in Ξ0 c → ΛK−π+ decays. The Λ baryon polarization is measured by fitting the angular distribution of its decay products in the entire phase space and in different regions of it. The analysis is based on the Run 2 dataset collected by LHCb detector, corresponding to an integrated luminosity of 3.7 fb−1 at 13 TeV center-of-mass energy. The analysis is performed on a signal yield of about 60000 events
Generalized plasmons in layered systems
No full textWe study the spectrum of electromagnetic modes in layered superconductors. We include the mixing between longitudinal and transverse degrees of freedom, which has been partly overlooked in the previous literature and is crucial to
describe the correct behaviour at long wavelengths. We derive a generalized plasma mode, which provides a link between the standard description of the layered plasmon and the one of the Josephson plasmon: we show that these are, respectively,
the large-momentum and the low-momentum limits of our model
Implementation and security analysis of continuous variable quantum secure direct communication protocols
No full textThe development of supercomputers and quantum computers will
threaten current secure communication protocols. However, quantum mechanics offers a solution guaranteeing physical layer and provable security of communications. In particular, quantum secure direct communication (QSDC) allows secret messages to be directly and securely communicated over a quantum channel. We investigate
implementations of continuous variable QSDC using single-mode squeezed coherent states, and state-of-the-art quantum optical technology. Indeed, the continuous variable regime can be well compatible with fully developed optical telecommunication technologies. The security of the protocols against different forms of attacks (e.g., intercept-resend attack and collective attack) and against losses and noise is investigated, both analytically and numerically