A5103270003- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- Astronomical and nuclear sciences
- Particle physics theoretical and experimental studies
- Quantum, superfluid, helium dynamics
- Advanced Chemical Physics Studies
- Nuclear reactor physics and engineering
- X-ray Spectroscopy and Fluorescence Analysis
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Neutrino Physics Research
- Inorganic Fluorides and Related Compounds
- Atomic and Subatomic Physics Research
- Nuclear Materials and Properties
- Astro and Planetary Science
- Muon and positron interactions and applications
- Electron and X-Ray Spectroscopy Techniques
- Boron Compounds in Chemistry
- Gamma-ray bursts and supernovae
- Medical Imaging Techniques and Applications
- Radiopharmaceutical Chemistry and Applications
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud
2014-2023
Istituto Nazionale di Fisica Nucleare
2009-2023
University of Catania
2014-2023
Osservatorio Astrofisico di Catania
2007-2023
University of Messina
2011
Istituto Nazionale di Fisica Nucleare, Sezione di Catania
1981-2011
Rudjer Boskovic Institute
1991-2011
Centro Siciliano di Fisica Nucleare e di Struttura della Materia
1978-2011
Institute for Nuclear Research
2011
Universidad de Sevilla
2010
Collisions induced by Be9,10,11 on a Zn64 target at the same c.m. energy were studied. For first time, strong effects of Be11 halo structure elastic-scattering and reaction mechanisms energies near Coulomb barrier are evidenced experimentally. The cross section nucleus shows unusual behavior in Coulomb-nuclear interference peak angular region. extracted total-reaction for collision is more than double ones measured collisions Be9,10. It shown that such enhancement with due to transfer...
In this paper details of the experimental procedure and data analysis collision ${}^{11}\mathrm{Be}{+}^{64}$Zn around Coulomb barrier are described discussed in framework different theoretical approaches. a previous work [A. Di Pietro et al., Phys. Rev. Lett. 105, 022701 (2010).], elastic scattering angular distribution collisions ${}^{9,10}\mathrm{Be}{+}^{64}$Zn as well for quasielastic transfer/breakup cross sections reaction were briefly reported. The suppression Coulomb-nuclear...
The astrophysically important 7Li(p, α)α reaction has been studied via the Trojan horse method in energy range E = 10-400 keV. A new theoretical description, based on distorted-wave Born approximation approach, allows one to extract information bare astrophysical S-factor, Sb(E), with Sb(0) 55 ± 3 keV barns. results are compared direct experimental data leading a model-independent value of electron screening potential energy, Ue 330 40 eV, much higher than adiabatic limit Uad 175 eV.
The ${}^{6}{\mathrm{L}\mathrm{i}(}^{6}\mathrm{Li},\ensuremath{\alpha}\ensuremath{\alpha}{)}^{4}\mathrm{He}$ three-body reaction has been studied in a kinematically complete experiment at ${E}_{{6}_{\mathrm{Li}}}=6\mathrm{MeV},$ from which indirect information on the ${}^{2}{\mathrm{H}(}^{6}\mathrm{Li},\ensuremath{\alpha}{)}^{4}\mathrm{He}$ two-body $13<~{E}_{\mathrm{c}.\mathrm{m}.}<~750\mathrm{}\mathrm{keV}$ extracted by applying Trojan horse method. method used recent improved formulation....
Fusion and transfer $+$ breakup channels have been studied in the collision induced by two-neutron-halo ${}^{6}$He on a ${}^{64}$Zn target at energies from below to above Coulomb barrier. For comparison, reaction stable isotope ${}^{4}$He same has studied. The fusion cross section measured using an activation technique, detecting off-line delayed x-ray activity following electron capture decay of evaporation residues. New measurements sub-barrier performed order cover energy range compare...
Angular distributions of the elastic, inelastic, and breakup cross sections halo nucleus ^{11}Be on ^{197}Au were measured at energies below (E_{lab}=31.9 MeV) around (39.6 Coulomb barrier. These three channels unambiguously separated for first time reactions a high-Z target low energies. The experiment was performed TRIUMF (Vancouver, Canada). differential compared with different calculations: semiclassical, inert-core continuum-coupled-channels ones including core deformation. results show...
Information on the ${}^{7}\mathrm{Li}(p,\ensuremath{\alpha}{)}^{4}\mathrm{He}$ reaction cross section at energies relevant for astrophysics has been obtained by means of indirect Trojan-horse method applied to three-body ${}^{2}\mathrm{H}{(}^{7}\mathrm{Li},\ensuremath{\alpha}\ensuremath{\alpha})n$ reaction. Measurements ${}^{7}\mathrm{Li}$-beam 19, 19.5, 20, and 21 MeV have carried out. The results are reported in terms astrophysical $S(E)$ factor. value $S(0)$ measured present experiment is...
view Abstract Citations (74) References (9) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Indirect Investigation of the d + 6Li Reaction at Low Energies Relevant for Nuclear Astrophysics Cherubini, S. ; Kondratyev, V. N. Lattuada, M. Spitaleri, C. Miljanic, D. Zadro, Baur, G. The indirect investigation low-energy charged-particle reactions relevant nuclear astrophysics is considered, employing statistical tensor analysis. Data from quasi-free contribution...
In a kinematically complete measurement of the7Li(7Li,α6He)4He reaction at Ei = 8 MeV it was observed that the 10Be excited states 9.6 and 10.2 decay by 6He emission. The state may be member rotational band based on 6.18 0+ state.
Elastic-scattering angular distributions for the $^{6}\mathrm{Li}+^{64}\mathrm{Zn}$ system were measured at eight beam energies from below to above Coulomb barrier, $12.0\ensuremath{\leqslant}{E}_{\mathrm{lab}}\ensuremath{\leqslant}22.0$ MeV. The experimental data analyzed within optical model study energy dependence of interaction potential and obtain total reaction cross sections. results obtained using several potentials show similar behavior. strengths real imaginary suggests presence...
Excitation functions for the production of heavy residues have been measured collisions ${}^{6,7}\mathrm{Li}+{}^{64}\mathrm{Zn}$ at energies around and below Coulomb barrier. The cross sections residue using an activation technique, detecting off-line characteristic atomic x-rays emitted in electron capture decay reaction products. experimental relative yields compared with statistical model calculations performed by code cascade. Such a comparison suggests that is dominated complete fusion...
Abstract The observational 19 F abundance in stellar environments systematically exceeds the predicted one, thus representing one of unsolved challenges for modeling. It is therefore clear that further investigation needed this field. In work, we focus our attention on measurement <?CDATA ${}^{19}{\rm{F}}{(\alpha ,p)}^{22}\mathrm{Ne}$?> reaction astrophysical energy range, between 0.2 and 0.8 MeV (far below Coulomb barrier, 3.8 MeV), as it represents main destruction channel He-rich...
The detection of the neutrinos produced in p−p chain and CNO cycle can be used to test Standard Solar Model. 3He(α,γ)7Be reaction is first 2nd 3rd branch chain, therefore, uncertainty its cross section sensitively influences prediction 7Be 8B neutrino fluxes. Despite importance large number experimental theoretical works devoted this reaction, knowledge on at energies characterizing core Sun (15 keV - 30 keV) limited further efforts are needed reach desired (≈ 3%) accuracy. precise external...
Abstract The cosmological lithium problem (CLP) stems from the outstanding discrepancy between theoretical predictions and astronomical observations of primordial abundances. For radiogenic production 7 Li, Be plays a pivotal role in Big Bang nucleosynthesis (BBN). Nevertheless, data for neutron-induced destruction processes were still sparse, especially lacked information on contributions transitions to Li excited states. In this work, we have determined <mml:math...
The ${}^{6}\mathrm{Li}(p,\ensuremath{\alpha}{)}^{3}\mathrm{He}$ reaction has been studied from ${E}_{\mathrm{c}.\mathrm{m}.}=2.4\mathrm{MeV}$ down to astrophysical energies by means of the indirect Trojan horse method applied ${}^{2}\mathrm{H}{(}^{6}\mathrm{Li},\ensuremath{\alpha}$ ${}^{3}\mathrm{He})$ n three-body performed at an incident energy 25 MeV. Coincidence spectra measured in a kinematically complete experiment show presence quasifree ${}^{6}\mathrm{Li}\ensuremath{-}p$ process....
The $^{2}\mathrm{H}$${(}^{7}$Li, \ensuremath{\alpha}\ensuremath{\alpha})n reaction was studied in a kinematically complete experiment at energies between 28 and 48 MeV. Coincidence spectra show the contribution from quasifree p${+}^{7}$Li\ensuremath{\rightarrow}\ensuremath{\alpha}+\ensuremath{\alpha} reaction. excitation function of cross section small neutron momenta extracted compared with behavior free section.
Abstract The main source of 19 F in the universe has not yet been clearly identified and this issue represents one unanswered questions stellar modeling. This lack knowledge can be due to F( α , p) 22 Ne reaction cross-section that proven difficult at low energies: direct measurements stop only about ∼660 keV, leaving roughly half astrophysical relevant energy region (from 200 keV 1.1 MeV) explored by R-matrix calculations. In work, we applied Trojan Horse Method quasi-free three-body 6 Li(...
Background: The $^{6}\mathrm{Li}(p,\ensuremath{\gamma})^{7}\mathrm{Be}$ cross section influences a variety of astrophysical scenarios, including big-bang and stellar nucleosynthesis. In recent years, conflicting results direct measurements have been published, reporting contradictory low-energy trends.Purpose: To shed light on the contradiction between existing data sets, reaction was studied using asymptotic normalization coefficient (ANC) technique which up-to-now never used for this...
Charged reaction products originated from the interaction of loosely bound radioactive ion beam $^{17}\mathrm{F}$ (${S}_{p}=600$ keV) with proton-shell closed $^{58}\mathrm{Ni}$ target were measured at two colliding energies slightly above Coulomb barrier. The collected data analyzed within framework optical model to deduce cross section and investigate role played by inelastic excitations, transfer channels, breakup process ${}^{17}\mathrm{F}\ensuremath{\rightarrow}{}^{16}\mathrm{O}+p$...
We have performed precision elastic backscattering measurements for the weakly bound nuclei 6,7Li on medium and heavy mass targets 58Ni, 116,120Sn 208Pb at sub- near-barrier energies (E c.m. /V bar = 0.6 to 1.3). Excitation functions of scattering cross-sections been measured ±160° ±170° corresponding ratios Rutherford relevant barrier distributions extracted. These complement recent work a 28Si target, probing systematically potential reaction mechanisms, while indicate possible breakdown...
States in the astrophysically important $^{19}\mathrm{Ne}$ nucleus have been populated directly using $^{15}\mathrm{O}(\ensuremath{\alpha},\phantom{\rule{0.16em}{0ex}}\ensuremath{\alpha})^{15}\mathrm{O}$ reaction with a radioactive $^{15}\mathrm{O}$ beam. Due to challenges involved, this represents first such measurement high resolution and dedicated exploring cluster structure. This comprises three experiments: develop beam, second resonant scattering study, third measure precise energy...
An excitation function for resonance elastic scattering of $\ensuremath{\alpha}$ particles on $^{18}\mathrm{O}$ and $^{18}\mathrm{Ne}$ was measured using the method inverse geometry with a very thick target. Spectroscopic information obtained 23 levels in energy region from 11.9 to $13.7\phantom{\rule{0.3em}{0ex}}\text{MeV}$ $^{22}\mathrm{Ne}$. Twelve them are new. General features $\ensuremath{\alpha}$-cluster bands $^{22}\mathrm{Ne}$ analyzed framework potential model deep well....
We have studied the ${}^{2}\mathrm{H}{(}^{6}\mathrm{Li},\ensuremath{\alpha}{)}^{4}\mathrm{He}$ two-body reaction by applying ``Trojan horse'' method (THM) to ${}^{6}\mathrm{Li}{(}^{6}\mathrm{Li},\ensuremath{\alpha}\ensuremath{\alpha}{)}^{4}\mathrm{He}$ three-body reaction. The astrophysical $S(E)$ factor has been extracted in energy range between 10--800 keV for two cases of target and projectile quasifree break-up. found good agreement data sets leading an improved determination with...