| 1. |
- Alvarado, F., et al.
(författare)
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Electroweak structure of the nucleon
- 2024
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Ingår i: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics. - : SOCIETÀ ITALIANA DI FISICA. - 1124-1896 .- 1826-9885. ; 47:4
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Tidskriftsartikel (refereegranskat)abstract
- The nucleon form factors (FFs) are studied in relativistic chiral perturbation theory (ChPT) in two flavors with explicit Δ(1232) degrees of freedom. For the electromagnetic isovector form factors we also employ dispersion theory to account for ρ-dominated isovector ππ interaction and its quark-mass dependence in the t -channel nonperturbatively and beyond NLO in ChPT. With this framework we explore how LQCD data are described in both the Q2 and Mπ dimensions simultaneously. Furthermore, we have performed an NNLO calculation of the nucleon axial form factor, extracting relevant low -energy constants (LECs) from a combined set of recent LQCD results from different collaborations.
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| 2. |
- Amoroso, A., et al.
(författare)
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A cylindrical GEM Inner Tracker for the BESIII experiment
- 2016
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Ingår i: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics. - 1124-1896 .- 1826-9885. ; 39:1
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Tidskriftsartikel (refereegranskat)abstract
- We are developing a cylindrical GEM detector with analog readout to upgrade the Inner Tracker of the BESIII experiment at IHEP (Beijing). The new detector will match the requirements for momentum resolution (sigma(pt)/pt similar to 0.5% at 1GeV) and radial resolution (sigma(xy) similar to 100 mu m) of the existing drift chamber and will improve significantly the spatial resolution along the beam direction (sigma(z) similar to 150 mu m) with very small material budget (about 1% of X-0). A beam test has been performed at CERN in order to measure the performance of a BESIII GEM prototype in a magnetic field up to 1 tesla. An overview of the project and the preliminary results of the test will be presented in the talk. The project has been recognised as a Significant Research Project within the Executive Programme for Scientific and Technological Cooperation between Italy and PRC for the years 2013-2015, and more recently has been selected as one of the project funded by the European Commission within the call H2020-MSCA-RISE-2014.
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| 3. |
- An, Di
(författare)
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Dispersive calculation for N*(1520) transition form factors at low energies
- 2024
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Ingår i: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics. - : Società Italiana di Fisica. - 1124-1896 .- 1826-9885. ; 47:4
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Tidskriftsartikel (refereegranskat)abstract
- The transition form factors of N*(1520) have been formulated and computed at low energies (|q2| < 1 GeV2) using dispersion theory for the first time. Utilizing hadronic data from N*(1520) -> N π, N*(1520) -> Δπ, and N*(1520) -> N ρ processes, we have calculated both space-like and time-like transition form factors. Our results demonstrate agreement with the existing space-like form factor data. The predicted time-like form factors can be experimentally tested by the HADES experiment.
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| 4. |
- Bagoly, Zsolt, et al.
(författare)
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Principal Component Analysis of Gamma-Ray Bursts' Spectra
- 2005
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Ingår i: Nuovo Cimento C. ; 28:3, s. 295-298
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Tidskriftsartikel (refereegranskat)abstract
- The origin of dark bursts--i.e. that have no observed afterglows in X-ray, optical/NIR and radio ranges--is unclear yet. Different possibilities--instrumental biases, very high redshifts, extinction in the host galaxies--are discussed and shown to be important. On the other hand, the dark bursts should not form a new subgroup of long gamma-ray bursts themselves.
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| 5. |
- De Simone, N., et al.
(författare)
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PAMELA : Measurements of matter and antimatter in space
- 2011
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Ingår i: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics. - 1124-1896 .- 1826-9885. ; 34:3, s. 79-87
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Tidskriftsartikel (refereegranskat)abstract
- On the 15th of June 2006, the PAMELA satellite-borne experiment was launched from the Baikonur cosmodrome and it has been collecting data since July 2006. The apparatus comprises a time-of-flight system, a silicon-microstrip magnetic spectrometer, a silicon-tungsten electromagnetic calorimeter, an anticoincidence system, a shower tail counter scintillator and a neutron detector. The combination of these devices allows precision studies of the charged cosmic radiation to be conducted over a wide energy range (100 MeV-100's GeV) with high statistics. The primary scientific goal is the measurement of the antiproton and positron energy spectra in order to search for exotic sources, such as dark matter particle annihilations. PAMELA is also searching for primordial antinuclei (antihelium), and testing cosmic-ray propagation models through precise measurements of the antiparticle energy spectrum and precision studies of light nuclei and their isotopes. Moreover, PAMELA investigates phenomena connected with solar and earth physics. The main results and updated data will be presented.
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| 6. |
- Dendooven, Peter, et al.
(författare)
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Passive methods for spent fuel characterisation at the Finnish geological repository
- 2023
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Ingår i: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics. - : Società Italiana di Fisica. - 1124-1896 .- 1826-9885. ; :2
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Tidskriftsartikel (refereegranskat)abstract
- Development of the Passive Gamma Emission Tomography (PGET)and Passive Neutron Albedo Reactivity (PNAR) methods in the context of the Finnish geological repository for spent nuclear fuel has shown that they provide,for BWR fuel assemblies, the comprehensive verification needed to meet the nuclear safeguards objectives of the repository. The principles of the PGET and PNAR methods and the design and operation of the respective instruments are presented. Afew results from measurements at the spent fuel storage pools at the Finnish nuclear power plants are discussed. The directions of ongoing and future developments are indicated.
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| 7. |
- Jeskova, Zuzana, et al.
(författare)
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In-service and pre-service teacher education in IBSE : The ESTABLISH approach
- 2015
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Ingår i: Nuovo Cimento C. - : Soc Italiana Fisica. - 2037-4909. ; 3
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Tidskriftsartikel (refereegranskat)abstract
- One of the main goals of the ESTABLISH 7fp project (available on line at http://www.establish-fp7.eu/) was the development and implementation of the professional development teacher education programmes (TEP) to support teachers in adopting inquiry-based strategies in their teaching. Within the project there was a model for in-service and pre-service teacher training in IBSE designed and implemented across 12 participating countries. The programme is based on 4 core elements and 4 additional elements that are built around the IBSE teaching units developed within the project. As accepted by ESTABLISH partners, all teacher training programmes include the minimum of the four elements, i.e. introduction to IBSE, industrial content knowledge, teacher as implementer and teacher as developer of IBSE teaching materials. There are also four additional elements designed in detail, i.e. ICT for IBSE, argumentation in the classroom, research and design projects for students, assessment of IBSE. These can be added to the programme optionally with regard to the level of teachers' IBSE skills and current situation in education and teachers' professional development within the country. This ESTABLISH model of TEP was followed in participating countries in order to change teachers' attitudes from traditional ways of teaching towards adopting inquiry strategies and their successful implementation in the classroom. Within the face-to-face workshops teachers experienced and developed their inquiry based teaching strategies using specifically developed materials. In addition, the e-platform has been developed to provide on-line support. This platform provides educators and teachers with all the necessary materials for the training and IBSE teaching units and other teaching materials for teachers' ongoing help. The teacher training programme was successfully implemented in Slovakia. There were two runs of teacher training workshops on IBSE already carried out. Moreover, the additional element ICT in IBSE was developed more deeply designing a separate teacher training course for it. The contribution discusses in more details the success and problems of implementation in the context of Slovak educational environment.
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| 8. |
- Jovicevic, Jelena
(författare)
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Performance of b-jet identification in ATLAS
- 2014
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Ingår i: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics. - : Editrice Compositori s.r.l.. - 1124-1896 .- 1826-9885. ; 37:6, s. 123-128
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Tidskriftsartikel (refereegranskat)abstract
- A performant identification of the jets originating from b-quarks is one of the key ingredients which allows for the diverse physics program of the ATLAS experiment. Algorithms for the b-jet identification in ATLAS are exploiting the long lifetime and the high mass of the b-hadrons, as well as the information on the tracks associated with jets. The performance of these algorithms is measured in data to enable reliable usage in the physics analyses. In this article, the performance of the multivariate technique MV1 for b-jet identification, which as its inputs takes information from the other b-jet identification algorithms in ATLAS, is presented. The efficiency of the MV1 algorithm is measured using dileptonic top pair events and is based on a likelihood approach. This approach allows to exploit per-event flavour and momentum correlations between the two jets. Correction factors which take into account differences in the b-jet identification efficiencies in simulation and data are derived as a function of jet transverse momentum and pseudo-rapidity. All the results are derived using the proton-proton collision dataset at centre of mass energy of √s = 8TeV corresponding to an integrated luminosity of L ≈ 20.3 fb-1.
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| 9. |
- Meszaros, A., et al.
(författare)
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On the origin of the dark gamma-ray bursts
- 2005
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Ingår i: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics. - 1124-1896 .- 1826-9885. ; 28:3, s. 311-314
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Tidskriftsartikel (refereegranskat)abstract
- The origin of dark bursts-i.e. that have no observed afterglows in X-ray, optical/NIR and radio ranges-is unclear yet. Different possibilities-instrumental biases, very high redshifts, extinction in the host galaxies-are discussed and shown to be important. On the other hand, the dark bursts should not form a new subgroup of long gamma-ray bursts themselves.
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| 10. |
- Moretti, Elena
(författare)
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Observations of GRBs with the fermi large area telescope
- 2011
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Ingår i: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics. - 1124-1896 .- 1826-9885. ; 34:3, s. 261-265
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Tidskriftsartikel (refereegranskat)abstract
- Fermi Gamma-ray Space Telescope successfully detected high-energy emission from 20 GRBs so far. Thanks to its unprecedented very wide energy coverage of Large Area Telescope (LAT: from 25MeV to < 300GeV) and Gammaray Burst Monitor (GBM: from 8keV to 40MeV), Fermi provided new observational pictures of GRBs. Here we review some of the GRB properties seen by the LAT instrument such as the delayed onset and longer durations of high-energy emission compared with low-energy emission of the GBM. An extra spectral component in high and low energy is detected in some GRBs and moreover for the first time a cut-off in the spectral extra component is seen. These temporal and spectral distinct behaviors inspire many implications on the emission mechanism, including leptonic, hadronic and afterglow origin. Fermi also placed constraints both on the bulk Lorentz factor of the relativistic jet, larger than 1000 for bright LAT GRBs, and on outside-GRB topics such as quantum gravity.
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| 11. |
- Ryde, Felix, et al.
(författare)
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The conspicuous gamma-ray burst of 30 May 1996
- 2005
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Ingår i: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics. - 1124-1896 .- 1826-9885. ; 28:3, s. 335-338
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Tidskriftsartikel (refereegranskat)abstract
- The spectra of the majority of bursts exhibit a low-energy power law index, a, that is either a constant or becomes softer with time. However, in the burst of 30 May 1996 a becomes harder. Here we show that this behavior can be explained by a hybrid model consisting of a thermal and a non-thermal component. In this burst the power law index of the non-thermal component changes drastically from s similar to -1.5 to s similar to -0.67 at approximately 5 seconds after the trigger, thereby revealing, at low energies, the thermal component with its hard Rayleigh-Jeans tail. This leads to the large alpha-values that are found if the Band function is fitted to the spectra. We suggest that the change in s could be due to a transition from fast to slow cooling of the electrons emitting in the BATSE range. This could be due to the fact that the magnetic field strength becomes weaker.
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| 12. |
- Sekiya, R., et al.
(författare)
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Search for η'-mesic nuclei in 12C(p, dp) reaction with the WASA detector at GSI-FRS
- 2024
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Ingår i: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics. - : Società Italiana di Fisica. - 1124-1896 .- 1826-9885. ; 47:4
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Tidskriftsartikel (refereegranskat)abstract
- We conducted an experimental search for η′-mesic nuclei, bound systems of an η′ meson and a nucleus, in 12C(p, dp) reactions. We measured the missing mass in the (p, d) reaction to obtain the mass spectrum of the reaction product near the η′ emission threshold. Forward-emitted deuterons were momentum-analyzed in the FRS of GSI. We installed a nearly 4π detector WASA near the 12C target to effectively select formation and decay of the η′-mesic nuclei. We are presently finalizing the analysis.
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| 13. |
- Sparvoli, R., et al.
(författare)
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Cosmic rays studies with the PAMELA space experiment
- 2009
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Ingår i: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics. - 1124-1896 .- 1826-9885. ; 32:5-6, s. 1-10
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Tidskriftsartikel (refereegranskat)abstract
- The instrument PAMELA, in orbit since June 15th, 2006 on board the Russian satellite Resurs DK1, is delivering to ground 16 Gigabytes of data per day. The apparatus is designed to study charged particles in the cosmic radiation, with a particular focus on antiparticles as a possible signature of dark matter annihilation in the galactic halo; the combination of a magnetic spectrometer and different detectors-indeed- allows antiparticles to be reliably identified from a large background of other charged particles. New results on the antiproton-to-proton and positron-to-all-electron ratios over a wide energy range (1-100GeV) have been recently released by the PAMELA Collaboration, and will be summarized in this paper. While the antiproton-to-proton ratio does not show particular differences from an antiparticle standard secondary production, in the positron-to-all-electron ratio an enhancement is clearly seen at energies above 10 GeV. Possible interpretations of this effect will be briefly discussed.
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| 14. |
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| 15. |
- Asadzadeh, Mohammad, 1952, et al.
(författare)
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On discontinuous Galerkin and discrete ordinates approximations for neutron transport equation and the critical eigenvalue.
- 2010
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Ingår i: Nuovo Cimento della Societa Italiana di Fisica C. - 1124-1896. ; 33:1, s. 21-29
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Tidskriftsartikel (refereegranskat)abstract
- The objective of this paper is to give a mathematical framework for a fully discrete numerical approach for the study of the neutron transport equation in a cylindrical domain (container model,). More specifically, we consider the discontinuous Galerkin (DG) finite element method for spatial approximation of the mono-energetic, critical neutron transport equation in an infinite cylindrical domain ω̃in R3 with a polygonal convex cross-section ω The velocity discretization relies on a special quadrature rule developed to give optimal estimates in discrete ordinate parameters compatible with the quasi-uniform spatial mesh. We use interpolation spaces and derive optimal error estimates, up to maximal available regularity, for the fully discrete scalar flux. Finally we employ a duality argument and prove superconvergence estimates for the critical eigenvalue.
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| 16. |
- Battistoni, G., et al.
(författare)
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The FLUKA code and its use in hadron therapy
- 2008
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Ingår i: Nuovo Cimento della Societa Italiana di Fisica C. - Italian Physical Society. - 1124-1896. ; 31:1, s. 69-75
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Tidskriftsartikel (refereegranskat)abstract
- FLUKA is a multipurpose Monte Carto code describing transport and interaction with matter of a, large variety of particles over a wide energy range ill complex geometries. FLUKA is successfully applied ill several fields, including, but not only particle physics, cosmic-ray physics, dosimetry, radioprotection, hadron therapy. space radiation, accelerator design and neutronics. Here we briefly review recent model developments and provide examples of applications to hadron therapy, including calculation of physical and biological dose for comparison with analytical treatment planning engines as well as beta(+)-activation for therapy monitoring by means of positron emission tomography.
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| 17. |
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| 18. |
- Bernhoff, Niclas, 1971-
(författare)
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On half-space problems for the discrete Boltzmann equation
- 2010
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Ingår i: Il Nuovo Cimento C. - Bologna : Società Italiana di Fisica. - 2037-4909 .- 1826-9885. ; 33:1, s. 47-54
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Tidskriftsartikel (refereegranskat)abstract
- We study typical half-space problems of rarefied gas dynamics, including the problems of Milne and Kramer, for the discrete Boltzmann equation (a general discrete velocity model, DVM, with an arbitrary finite number of velocities). Then the discrete Boltzmann equation reduces to a system of ODEs. The data for the outgoing particles at the boundary are assigned, possibly linearly depending on the data for the incoming particles. A classification of well-posed half-space problems for the homogeneous, as well as the inhomogeneous, linearized discrete Boltzmann equation is made. In the non-linear case the solutions are assumed to tend to an assigned Maxwellian at infinity. The conditions on the data at the boundary needed for the existence of a unique (in a neighborhood of the assigned Maxwellian) solution of the problem are investigated. In the non-degenerate case (corresponding, in the continuous case, to the case when the Mach number at the Maxwellian at infinity is different of -1, 0 and 1) implicit conditions are found. Furthermore, under certain assumptions explicit conditions are found, both in the non-degenerate and degenerate cases. An application to axially symmetric models is also studied
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| 19. |
- Buoninfante, Luca, 1992-, et al.
(författare)
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Quantum gravity, higher derivatives and nonlocality
- 2022
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Ingår i: NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS. - : SOC ITALIANA FISICA. - 2037-4909 .- 1826-9885. ; 45:2
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Tidskriftsartikel (refereegranskat)abstract
- The aim of the workshop Quantum Gravity, Higher Derivatives & Nonlocality (QGRAV-2021) was to assess our current understanding of the interplay between gravity and quantum mechanics, with particular attention to what is the main role of higher derivatives and nonlocality in the formulation of a consistent theory of quantum gravity, and whether they are really necessary to describe Nature at a fundamental level. The workshop had brought together various schools of thought, and besides talks numerous discussions were also held. In addition to focusing on formal aspects of several approaches, applications of higher derivatives arid non locality were also discussed in the context of cosmology and black-hole physics. In this preface article we present a concise explanation of the main problems underlying the quantization of gravity in the high-energy regime, briefly list several approaches that have been proposed so far, and also provide a gist of what was intensively discussed during the workshop.
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| 20. |
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| 21. |
- Longo, F., et al.
(författare)
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Variable and transient Galactic gamma-ray sources with AGILE
- 2011
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Ingår i: Nuovo Cimento della Societa Italiana di Fisica C. - 1124-1896. ; 34:3, s. 191-196
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Tidskriftsartikel (refereegranskat)abstract
- AGILE has been providing continous monitoring of the Galactic plane in its three years of operation. Thanks to its sensitivity at energies near 100 MeV, AGILE has observed variability and transient behaviour in a number of sources. Simultaneous hard-X-ray coverage, rapid alerts to the astronomical community, and multiwavelength campaigns have provided identifications for some of these sources and placed constraints on others. We provide an overview of these observations and their possible counterparts, including microquasars and colliding wind binaries.
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| 22. |
- Pettersson, Rolf, 1937
(författare)
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On global boundedness of higher velocity moments for solutions to the linear Boltzmann equation with hard sphere collisions
- 2010
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Ingår i: Nuovo Cimento della Societa Italiana di Fisica C. - 1124-1896. ; 33:1, s. 189-197
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Tidskriftsartikel (refereegranskat)abstract
- This paper considers the time- and space-dependent linear Boltzmann equation for elastic or inelastic (granular) collisions. First, in the angular cut-off case or with hard sphere collisions, mild L 1-solutions are constructed as limits of iterate functions. Then, in the case of hard sphere collisions together with, e.g., specular boundary conditions, global boundedness in time of higher velocity moments is proved, using our old collision velocity estimates together with a Jensen inequality. This generalizes our earlier results for hard inverse collision forces, and also results given by other authors from the space-homogeneous case to our space-dependent one.
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| 23. |
- Pieramico, G., et al.
(författare)
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Geant4 simulation of the ABALONE photosensor
- 2022
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Ingår i: Il Nuovo Cimento. - 2037-4909 .- 1826-9885. ; 45:1
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Tidskriftsartikel (refereegranskat)abstract
- The ABALONE is a new type of photosensor produced by PhotonLab, Inc. with cost effective mass production, robustness and high performance. This modern technology provides sensitivity to visible and UV light, exceptional radio-purity and excellent detection performance in terms of intrinsic gain, afterpulsing rate, timing resolution and single-photon sensitivity. The ABALONE is based on the acceleration of photoelectrons in vacuum. These are generated in a traditional photocathode and guided towards a window of scintillating material. The resulting scintillation light can be read from the outside via a silicon photomultiplier (SiPM). The device has been proposed as a possible candidate for the DARWIN experiment. We performed the complete simulation of the detector, mapped the electrostatic field within the vacuum of the sensor and studied its possible optimization.
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| 24. |
- Rieutord, M, et al.
(författare)
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A simulation of solar convection at supergranulation scale
- 2002
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Ingår i: Nuovo Cimento C. Colloquia on Physics. - 1124-1896. ; 25:5-6, s. 523-528
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Tidskriftsartikel (refereegranskat)abstract
- We present here numerical simulations of surface solar convection which cover a box of 30 x 30 x 3.2 Mm(3) with a resolution of 315 x 315 x 82, which is used to investigate the dynamics of scales larger than granulation. No structure resembling supergranulation is present; possibly higher Reynolds numbers (i.e. higher numerical resolution), or magnetic fields, or greater depth are necessary. The results also show interesting aspects of granular dynamics which are briefly presented, like extensive p-mode ridges in the k-w diagram and a ringlike distribution of horizontal vorticity around granules. At large scales, the horizontal velocity is much larger than the vertical velocity and the vertical motion is dominated by p-mode oscillations.
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| 25. |
- Spartà, R., et al.
(författare)
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8B reaction dynamics researched at HIE-ISOLDE
- 2024
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Ingår i: Nuovo Cimento della Societa Italiana di Fisica C. - 2037-4909 .- 1826-9885. ; 47:2
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Tidskriftsartikel (refereegranskat)abstract
- For the first time a measurement of 8B + 64Zn reaction has been performed at HIE-ISOLDE at CERN at energies around the Coulomb barrier, to understand how the debated halo structure of the light nucleus can affect reaction dynamics.
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