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Study of LCP emissions from 46Ti∗
Get PDFThe study of pre-equilibrium emitted particles is an useful tool to examine nuclear clustering; in order to study how possible cluster structures affect nuclear reactions, the NUCL-EX collaboration (INFN, Italy) is carrying out an
extensive research campaign on pre-equilibrium emission of light charged particles from hot nuclei. In this framework, the reactions 16O + 30Si, 18O + 28Si and 19F + 27Al at 7 MeV/u have been measured at the GARFIELD+RCo array in Legnaro National Laboratories. After a general introduction on the experimental campaign, this contribution will focus on the analysis results obtained so far; effects related to
the entrance channel and to the colliding ions cluster nature are emphasized through differences between the theoretical predictions and the experimental data
Deviations from Hauser-Feshbach behaviour in evaporation chains in light heavy-ion collisions
Get PDFIn the framework of the INFN NUCL-Ex experiment, we extended the investigation on the decay of light nuclei at excitation energies above particle emission thresholds, by performing exclusive fusion-evaporation measurements. The
16O + 12C reaction was investigated at three different bombarding energies, 90.5, 110 and 130 MeV. For complete fusion, such reactions lead to a fused 28Si∗ compound
nucleus respectively at 55, 63 and 72 MeV excitation energy. By investigating this autoconjugate system we put into evidence the role of non-statistical effects, also
clearly observed in our previous studies in lighter systems
Study of shape coexistence in the 188Hg isotope
Get PDFShape coexistence is a striking phenomenon that has attracted a large community and has been evidenced in many nuclear species where structures belonging to different deformations are observed coexisting within a typical energy range of nuclear excitation. Along the Z=80 isotopic chain, the 188Hg nucleus is the border-line where the presence of this phenomenon is foreseen but has not been confirmed yet. For this reason, this nucleus has been studied in a two-steps experiment performed at the Laboratori Nazionali di Legnaro in order to measure the lifetimes of the low-lying states of the 188Hg
Updates on long-term alignment monitoring and diagnostics for ATLAS ID misalignments
Get PDFThis work deals with the alignment of ID tracker modules of the ATLAS experiment at the LH
Magnetic noise in Advanced Virgo
Get PDFI present a study of the electromagnetic coupling through the coilmagnet pairs used as actuators in Advanced Virgo (AdV) Input Mirror Payloads. We first employed and validated a finite-element analysis approach, followed by a series of stimulated magnetic noise injections in the interferometer, both leading to an estimation of the magnetic noise contribution to the total AdV strain noise. At this stage, AdV seems to be unaffected by magnetic noise. However, we foresee a non-negligible coupling once AdV reaches the design sensitivity. Finally I present the most recent efforts concerning Schumann global magnetic resonances, whose detection and successful subtraction could make the observation of a Stochastic Gravitational Wave Background possible
First observation of B0 (s) → J/ψ pp decays and precise measurement of B0 (s) masses
Get PDFIn this article the first observation of B0 (s) → J/ψ pp is reported along with the most precise B0 (s) mass measurements. The analysis is performed using the data sample collected by LHCb during 2011–2016, corresponding to an integrated luminosity of 5.2 fb−1. The B0 (s) → J/ψ pp decays are suppressed due to the OZI and Cabibbo rules, as well as due to the limited available phase space. The
branching fractions are measured to be B(B0 → J/ψ pp) = (4.51±0.40 (stat) ± 0.44 (syst)) ×10−7 and B(B0 s → J/ψ pp) = (3.58±0.19 (stat) ± 0.39 (syst)) ×10−6. The B0 s branching fraction is two order of magnitude higher than a na¨ıve expectation of O(10−9). The suppression can be lifted by the existence of pentaquarks and glueballs in the J/ψ p and pp system, respectively. In addition, due to the limited available phase space, the most precise mass measurements are permitted. The measured value of the B0 mass is 5279.74 ± 0.30 (stat) ± 0.10 (syst) MeV, and that
of the B0 s mass is 5366.85 ± 0.19 (stat) ± 0.13 (syst) MeV
Testing gravity with atomic quantum sensors
Get PDFIn this article, three experiments aimed at the detection of gravitational effects with atomic sensors are reported. In the first experiment, a gradiometer is used to perform a precision measurement of the Newtonian gravitational
constant G. In the second experiment, a similar apparatus is used to provide a test of the Weak Equivalence Principle for atoms in different internal states and in a coherent superposition of internal states. Finally, in the third experiment, a new kind of interferometer operating on a single-photon transition is described. This sensor
is a promising candidate for the detection of low frequency gravitational waves
Multi-diagnostics investigation of an ECR plasma confined in a linear axis-symmetric trap
Get PDFThis work presents a review of all the main methods and instruments for plasma diagnostics currently used for linear axis-symmetric plasma traps, commonly used as ion sources for accelerators and for studies of plasma physics. The simultaneous use of different diagnostics, either invasive or non-invasive, allows the characterization of the whole electron energy distribution function from a few eV to hundreds of keV. The development of space-resolved and time-resolved plasma diagnostics, moreover, is expected to further improve our knowledge of the wave-to-plasma coupling and of plasma instabilities (like the cyclotron maser), with consequences on the upgrade of existing ion sources, but also on the understanding of many astrophysical phenomena
La ricerca per l'accessibilità
Get PDFIl contributo interdisciplinare, presentato durante il convegno (Confronto sull’Inclusione, organizzato dal Disability Pride Italia), ha voluto sintetizzare le competenze del gruppo di lavoro del Consiglio Nazionale delle Ricerche (CNR) sulla tematica dell’accessibilità – Universal Design e l’abbattimento delle barriere architettoniche, proponendo suggerimenti operativi e azioni concrete scaturiti dai risultati di progetti di ricerca dei vari ricercatori/tecnologi afferenti ai diversi Istituti del CNR.
L’accessibilità è stata analizzata sotto varie forme tenendo in considerazione le diverse dimensioni della disabilità (motoria, visiva, uditiva, cognitiva, dislessia, autismo, …). Dai risultati dei progetti di ricerca presentati derivano, ad esempio, precise indicazioni sull’importanza di: eseguire interventi strutturali per rimuovere le barriere fisiche per favorire la piena accessibilità; fornire servizi e sicurezza adeguati, come predisporre un piano di evacuazione che tenga conto della presenza di persone con disabilità motorie e informare l’interessato/a sulle procedure da seguire; inserire appositi accorgimenti tattilo-plantari, o riproduzione di suoni o contenuti audio, una facile identificazione del desk di accoglienza con personale dedicato/specializzato in luoghi pubblici o privati; predisporre pannelli video in cui siano presentate le informazioni sia in LIS che con sottotitoli con utilizzo della comunicazione aumentativa alternativa per l’orientamento, nonché prevedere test di gradimento per la valutazione dell’accessibilità.
Oltre alle indicazioni pratiche per favorire una sempre più ampia accessibilità, la relazione ha sottolineato come sia fondamentale, anche in linea con la normativa europea, prevedere meccanismi di monitoraggio efficaci al fine di garantire l’accessibilità e monitorare le sanzioni nei confronti di chi non applica gli standard di accessibilità. Inoltre, il contributo ha portato a conoscenza delle istituzioni nonché di un pubblico più ampio, i vari progetti e le attività di ricerca concluse e in corso degli Istituti del CNR