Centro Siciliano Of Fisica Nucleare E Struttura Della Materia

Catania, Italy

Centro Siciliano Of Fisica Nucleare E Struttura Della Materia

Catania, Italy

Time filter

Source Type

Kim K.,Korea Basic Science Institute | Kim Y.,Korea Basic Science Institute | Nasirov A.K.,Institute of Nuclear Physics of Uzbekistan | Nasirov A.K.,Kyungpook National University | And 5 more authors.
Physical Review C - Nuclear Physics | Year: 2015

The evaporation residue yields from the compound nuclei Th220 formed in the O16+Pb204, Ar40+Hf180, Se82+Ba138, and Sn124+Zr96 reactions are analyzed to study the entrance channel effects by comparison of the capture, fusion, and evaporation residue cross sections calculated by the combined dinuclear system (DNS) and advanced statistical models. The difference between evaporation residue (ER) cross sections can be related to the stages of compound nucleus formation and/or its survival against fission. The sensitivity of both stages in the evolution of the DNS up to the evaporation residue formation to the angular momentum of DNS is studied. The difference between fusion excitation functions is explained by the hindrance to complete fusion due to the larger intrinsic fusion barrier Bfus∗ for the transformation of the DNS into a compound nucleus and the increase of the quasifission contribution due to the decreasing of the quasifission barrier Bqf as a function of the angular momentum. The largest value of the ER residue yields in the very mass asymmetric O16+Pb204 reaction is related to the large fusion probability and to the relatively low threshold of the excitation energy of the compound nucleus. Due to the large threshold of the excitation energy (35 MeV) of the Ar40+Hf180 reaction, it produces ER yields less than the almost mass symmetric Se82+Ba138 reaction having the lowest threshold value (12 MeV). © 2015 American Physical Society.


La Cognata M.,University of Catania | La Cognata M.,Centro Siciliano Of Fisica Nucleare E Struttura Della Materia | Spitaleri C.,University of Catania | Mukhamedzhanov A.,Texas A&M University | And 23 more authors.
Astrophysical Journal | Year: 2010

The 18O(p, α)15N reaction is of primary importance to pin down the uncertainties, due to nuclear physics input, affecting present-day models of asymptotic giant branch stars. Its reaction rate can modify both fluorine nucleosynthesis inside such stars and oxygen and nitrogen isotopic ratios, which allow one to constrain the proposed astrophysical scenarios. Thus, an indirect measurement of the low-energy region of the 18O(p, α)15N reaction has been performed to access, for the first time, the range of relevance for astrophysical application. In particular, a full, high-accuracy spectroscopic study of the 20 and 90 keV resonances has been performed and the strengths deduced to evaluate the reaction rate and the consequences for astrophysics. © 2010. The American Astronomical Society. All rights reserved.


Mandaglio G.,Centro Siciliano Of Fisica Nucleare E Struttura Della Materia | Mandaglio G.,Messina University | Mandaglio G.,National Institute of Nuclear Physics, Italy | Giardina G.,Messina University | And 3 more authors.
Physical Review C - Nuclear Physics | Year: 2012

The study of the 48Ca+249-252Cf reactions in a wide energy interval around the external barrier has been achieved with the aim of investigating the dynamical effects of the entrance channel via the 48Ca induced reactions on the 249-252Cf targets and to analyze the influence of odd and even neutron composition in target on the capture, quasifission, and fusion cross sections. Moreover, we also present the results of the individual evaporation residue excitation functions obtained from the de-excitation cascade of the various even-odd and even-even 297-300118 superheavy compound nuclei reached in the studied reactions, and we compare our results of the 294118 evaporation residue yields obtained in the synthesis process of the 48Ca+249,250Cf reactions with the experimental data obtained in the 48Ca+249Cf experiment carried out at the Flerov Laboratory of Nuclear Reactions of Dubna. © 2012 American Physical Society.


Torresi D.,National Institute of Nuclear Physics, Italy | Torresi D.,Centro Siciliano Of Fisica Nucleare E Struttura Della Materia | Stanko D.,University of Zagreb | Di Pietro A.,National Institute of Nuclear Physics, Italy | And 12 more authors.
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2013

Double Sided Silicon Strip Detectors (DSSSD) are highly segmented detectors that are widely used in nuclear physics especially in radioactive beam experiments where, due to the low beam intensities, one needs to cover large solid angles with high granularity. A study of the response of DSSSDs, using 7Li and 16O beams at different energies is presented. In order to characterize the detector behavior for events corresponding to particles entering the detector in the interstrip gap both for ohmic and junction sides, signals of positive and negative polarities were acquired at the same time. Different procedures for the selection of full energy events and for the determination of the corresponding efficiencies are shown and discussed. © 2013 Elsevier B.V. All rights reserved.


Russotto P.,National Institute of Nuclear Physics, Italy | Russotto P.,Centro Siciliano Of Fisica Nucleare E Struttura Della Materia
Nuovo Cimento della Societa Italiana di Fisica C | Year: 2011

The Equation Of State of asymmetric nuclear matter is of fundamental importance for both nuclear physics and astrophysics. However, the present understanding of the EOS is limited, largely due to the poor knowledge of the density dependence of the nuclear symmetry energy. In fact, while considerable progress has been made recently in determining the behaviour of symmetry energy at sub-normal nuclear matter density, much more work is still needed to probe its behaviour at high density. The ASY-EOS experiment at GSI will measure elliptic flow (squeeze-out) of neutrons, protons and light complex particles in reactions of isospin asymmetric systems at pre-relativistic energies, in order to provide quantitative information on the density dependence of symmetry energy at densities larger than the saturation one. © Società Italiana di Fisica.


Tudisco S.,National Institute of Nuclear Physics, Italy | Mascali D.,National Institute of Nuclear Physics, Italy | Gambino N.,National Institute of Nuclear Physics, Italy | Gambino N.,University of Catania | And 8 more authors.
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2011

At DMFCI of Catania University, where a Quanta System Nd:YAG laser 600 mJ of energy, 1064 nm wavelength and 6 ns pulse length operates, experiments about plasma expansion in vacuum (<10-5 mbar), have been performed. Our studies are mostly devoted to nuclear and astrophysical purposes. Some preliminary investigations with aluminum thick targets are reported here. Plasma dynamics have been investigated mainly by means of a movable Langmuir Probe, and time of flight spectra have been acquired at different distances from the lasertarget interaction area. The cross-correlation of Langmuir probe signals and hydro-dynamical simulation has permitted to calculate the structure of the inner plasma self-generated electric field that drives the plume expansion. The experimental data reveals also a time variable behavior of the self-generated field. This dependence on time produces also a multi-shell plasma in which the different layers expand with a given velocity, temperature and density. © 2011 Elsevier B.V.


Mandaglio G.,Centro Siciliano Of Fisica Nucleare E Struttura Della Materia | Mandaglio G.,Messina University | Mandaglio G.,National Institute of Nuclear Physics, Italy
Nuclear and Particle Physics Proceedings | Year: 2015

The KLOE experiment was the first to exploit Initial State Radiation (ISR) processes to obtain the e+e-→π+π-(γ) cross section below 1 GeV. Three measurements have been published with small angle photon in the initial state: normalized using luminosity from Bhabha in 2005 and 2008 and using ππγ/μμγ ratio in 2014. An independent measurement with the large angle photon normalized to Bhabha has been published in 2011. These measurements are in good agreement, showing a good consistency among different analyses. A preliminary Gounaris-Sakurai fit of the pion form factor of the combined KLOE measurements is presented. We also discuss the γγ physics program of KLOE-2 experiment, made possible after the recent KLOE upgrade with new small angle tagging detectors along the DAFNE beam line. These detectors allow to detect the final leptons coming from process e+e-→e+e-γ*γ* giving the possibility to measure the π0→γγ decay and γ*γ→π0 transition form factor. These measurements provide constraints to the models used to calculate the hadronic light-by-light contribution to the muon anomaly. © 2015 Elsevier B.V.


D'Arrigo A.,CNR Institute for Microelectronics and Microsystems | D'Arrigo A.,University of Catania | Benenti G.,University of Insubria | Benenti G.,National Institute of Nuclear Physics, Italy | And 5 more authors.
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We study information transmission over a fully correlated amplitude damping channel acting on two qubits. We derive the single-shot classical channel capacity and show that entanglement is needed to achieve the channel best performance. We discuss the degradability properties of the channel and evaluate the quantum capacity for any value of the noise parameter. We finally compute the entanglement-assisted classical channel capacity. © 2013 American Physical Society.


Torrisi L.,Messina University | Torrisi L.,National Institute of Nuclear Physics, Italy | Cutroneo M.,Messina University | Cutroneo M.,Centro Siciliano Of Fisica Nucleare E Struttura Della Materia
Radiation Effects and Defects in Solids | Year: 2012

Hydrogenated targets have been irradiated in vacuum with the pulsed Nd:YAg laser at intensities of the order of 10 10 W/cm 2. The laser-generated plasma, produced by the interaction with the solid, emits protons and other ions along the normal to the target surface. Ion collectors and ion energy analyzer were used to measure the current, the angular emission and the energy distributions of the emitted protons. Time-of-flight measurements, Coulomb-Boltzmann-distributions and the fits of experimental data were also used in order to evaluate the equivalent ion plasma temperature and the ion acceleration developed in the non-equilibrium-pulsed plasma. © 2012 Taylor & Francis.


Falci G.,University of Catania | Falci G.,CNR Institute for Microelectronics and Microsystems | Falci G.,Centro Siciliano Of Fisica Nucleare E Struttura Della Materia | La Cognata A.,Centro Siciliano Of Fisica Nucleare E Struttura Della Materia | And 6 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2013

The implementation of a Lambda scheme in superconducting artificial atoms could allow detection of stimulated Raman adiabatic passage (STIRAP) and other quantum manipulations in the microwave regime. However, symmetries which on one hand protect the system against decoherence yield selection rules which may cancel coupling to the pump external drive. The tradeoff between efficient coupling and decoherence due to broad-band colored noise (BBCN), which is often the main source of decoherence, is addressed in the class of nanodevices based on the Cooper pair box (CPB) design. We study transfer efficiency by STIRAP, showing that substantial efficiency is achieved for off-symmetric bias only in the charge-phase regime. We find a number of results uniquely due to non-Markovianity of BBCN, namely (a) the efficiency for STIRAP depends essentially on noise channels in the trapped subspace; (b) low-frequency fluctuations can be analyzed and represented as fictitious correlated fluctuations of the detunings of the external drives; and (c) a simple figure of merit for design and operating prescriptions allowing the observation of STIRAP is proposed. The emerging physical picture also applies to other classes of coherent nanodevices subject to BBCN. © 2013 American Physical Society.

Loading Centro Siciliano Of Fisica Nucleare E Struttura Della Materia collaborators
Loading Centro Siciliano Of Fisica Nucleare E Struttura Della Materia collaborators