S. Piantelli

University of Florence

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G. Casini

University of Florence

129

S. Barlini

Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

121

G. Pasquali

University of Florence

119

F. Gramegna

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro

116

T. Marchi

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro

110

S. Valdrè

Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

A. Olmi

Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

G. Poggi

Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

M. Bruno

University of Bologna

M. Bini

University of Florence

Cooperative Institutions

Istituto Nazionale di Fisica Nucleare

325

Centre National de la Recherche Scientifique

211

Institut National de Physique Nucléaire et de Physique des Particules

161

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud

144

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro

136

University of Catania

110

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

University of Padua

Istituto Nazionale di Fisica Nucleare, Sezione di Padova

Istituto Nazionale di Fisica Nucleare, Sezione di Catania

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Isospin diffusion from Ca40,48+Ca40,48 experimental data at Fermi energies: …

Physical review. C (2024)

Q. Fable L. Baldesi S. Barlini E. Bonnet B. Borderie

This article presents an investigation of isospin equilibration in cross-bombarding $^{40,48}\mathrm{Ca}+^{40,48}\mathrm{Ca}$ reactions at 35 MeV/nucleon, by comparing experimental data with filtered transport model calculations. Isospin diffusion is studied using the evolution of the isospin transport ratio with centrality. The asymmetry parameter $\ensuremath{\delta}=(N\ensuremath{-}Z)/A$ of the quasiprojectile (QP) residue is used as isospin-sensitive observable, while a recent method for impact parameter reconstruction is used for centrality sorting. A benchmark of global observables is proposed to assess the relevance of the antisymmetrized molecular dynamics (amd) model, coupled to gemini$++$, in the study of dissipative collisions. Our results demonstrate the importance of considering cluster formation to reproduce observables used for isospin transport and centrality studies. Within the amd model, we prove the applicability of the impact parameter reconstruction method, enabling a direct comparison to the experimental data for the investigation of isospin diffusion. For both, we evidence a tendency to isospin equilibration with an impact parameter decreasing from 9 to 3 fm, while the full equilibration is not reached. A weak sensitivity to the stiffness of the equation of state employed in the model is also observed, with a better reproduction of the experimental trend for the neutron-rich reactions.

10.1103/physrevc.109.064605

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Isospin diffusion in binary collisions of S32+Ca40,48 and Physical review. C (2017)

S. Piantelli S. Valdrè S. Barlini G. Casini M. Colonna

The systems $^{32}\mathrm{S}+^{40,48}\mathrm{Ca}$ and $^{32}\mathrm{S}+^{48}\mathrm{Ti}$ at 17.7 MeV/nucleon were investigated with the setup general array for fragment identification and for emitted light particles in dissipative collisions (GARFIELD) plus ring counter (RCo) at Laboratori Nazionali di Legnaro (LNL) of Istituto Nazionale di Fisica Nucleare (INFN). Fusion evaporation (FE), fusion fission (FF), and deep inelastic (DIC) events were identified, also through the comparison with the prediction of a transport model (stochastic mean field, SMF), coupled to GEMINI++ as an afterburner. This work mainly deals with the study of isospin transport phenomena in DIC events. In particular, the isospin diffusion is highlighted by comparing the average isotopic content of the quasiprojectile (QP) remnants observed when the target is the $N=Z$ nucleus $^{40}\mathrm{Ca}$ and when it is the neutron-rich $^{48}\mathrm{Ca}$. Also, the $d/p$ and $t/p$ ratios for particles forward emitted with respect to the QP were found to increase with increasing $N/Z$ of the target.

10.1103/physrevc.96.034622

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Citations (16)

The Fazia initiative: more powerful detectors for a more detailed investigation on the origin and the decay of charged fragments

G. Casini M. Pârlog A. A. Stefanini T. Kozik G. Baiocco

The main results of the R&D program of the FAZIA collaboration are described. The objective was to improve particle identication capabilities from solid-state telescopes made of Silicon detectors and CsI(Tl) scintillators in view of a new large acceptance apparatus to be used for heavy-ion physics. Important progresses have been made on silicon detectors thanks to a careful control of the material, of its doping uniformity and of the crystal orientation. Moreover, the use of appropriate fast digital electronics allowed to extract maximum information via Pulse Shape Analysis and to propose new configurations of CsI(Tl) readout. Some of the recent results of the telescopes are discussed here, together with some perspective and preliminary data on the physics program at intermediate bombarding energies

Nuclear electronics

Particle detector

Semiconductor detector

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First results from the INDRA-FAZIA apparatus on isospin diffusion in $^{58,64}$Ni+$^{58,64}$Ni systems at Fermi energies

arXiv (Cornell University) (2022)

C. Ciampi S. Piantelli G. Casini G. Pasquali J. Quicray

An investigation of the isospin equilibration process in the reactions $^{58,64}$Ni+$^{58,64}$Ni at two bombarding energies in the Fermi regime ($32\,$MeV/nucleon and $52\,$MeV/nucleon) is presented. Data have been acquired during the first experimental campaign of the coupled INDRA-FAZIA apparatus in GANIL. Selecting from peripheral to semi-central collisions, both the neutron content of the quasiprojectile residue and that of the light ejectiles coming from the quasiprojectile evaporation have been used as probes of the dynamical process of isospin diffusion between projectile and target for the asymmetric systems. The isospin transport ratio technique has been employed. The relaxation of the initial isospin imbalance with increasing centrality has been clearly evidenced. The isospin equilibration appears stronger for the reactions at $32\,$MeV/nucleon, as expected due to the longer projectile-target interaction time than at $52\,$MeV/nucleon. Coherent indications of isospin equilibration come from the quasiprojectile residue characteristics and from particles ascribed to the quasiprojectile decay.

10.48550/arxiv.2205.10171

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Enhanced α α-particle production from fusion evaporation reactions leading to ⁴⁶Ti

Journal of Physics G Nuclear and Particle Physics (2021)

M. Cicerchia F. Gramegna D. Fabris M. Cinausero T. Marchi

Abstract In this paper, we report a detailed study on the de-excitation of the 46 Ti compound nucleus populated by means of four different reactions: 16 O + 30 Si at 7 and 8 AMeV, 18 O + 28 Si at 7 AMeV and 19 F + 27 Al at 7 AMeV. The GARFIELD detection array was used to measure the light charged particles and the heavy fragments emitted. This setup covers a large fraction of the solid angle with high-granularity. Complete events are chosen through total charge ( Z TOT = 22) detection. Fusion-evaporation events are selected based on the condition that only one heavy fragment is detected in coincidence with the light charged particles. The analysis of global observables, such as charge distribution and light charged particle multiplicities, is compatible with the formation of a thermalized compound nucleus for all the four reactions. Nevertheless, an enhanced emission of α -particles with respect to a pure statistical picture is observed at very forward angles (<20°). This enhancement is mainly visible in the even-Z residue exit channels populated through the emission of only α -particles.

Granularity

Solid angle

Particle (ecology)

10.1088/1361-6471/abe5f6

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Full disassembly of excited Mg24 into six α particles

Physical review. C (2019)

L. Morelli M. Bruno M. D’Agostino G. Baiocco F. Gulminelli

The decay of an excited $^{24}\mathrm{Mg}$ nucleus into six $\ensuremath{\alpha}$ particles is studied, from a selection of central $^{12}\mathrm{C}+^{12}\mathrm{C}$ reactions at 95 MeV beam energy, measured with the GARFIELD-RCo apparatus. Kinematic correlations among the detected $\ensuremath{\alpha}$ particles allow investigating the decay mechanism leading to the full disassembly of $^{24}\mathrm{Mg}$ into $\ensuremath{\alpha}$ particles. Experimental data indicate that the decay proceeds through intermediate doorway states involving excited states of $^{12}\mathrm{C}$ and $^{8}\mathrm{Be}$, with an important branching ratio estimated to be of the order of 40%. The possibility of a simultaneous breakup of the hot source in three bodies ($\ensuremath{\alpha}$, $^{8}\mathrm{Be}$, $^{12}\mathrm{C}$) is excluded in favor of a sequential emission. This is confirmed by comparison with statistical model predictions, where the emission of $^{8}\mathrm{Be}$ in both its ground state and first excited state is considered. Residual differences with respect to the statistical model are observed, particularly in the branching ratio of the Hoyle state with respect to higher excitation energy $^{12}\mathrm{C}$ states.

Branching fraction

10.1103/physrevc.99.054610

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Citations (12)

FAZIA: a new generation array for nuclear dynamics and EoS experiments at intermediate energies

International Journal of Modern Physics A (2024)

S. Valdrè A. Camaiani G. Verde S. Piantelli G. Casini

Constraining the nuclear equation of state (EoS) parameters makes it possible to better understand the properties of the matter that constitutes our Universe. Many probes can be used to test the EoS, from the observation of neutron star mergers to heavy-ion collisions at intermediate energies. The fragments and particles emitted in collisions need to be identified with isotopic discrimination in order to give valuable information. In this regard, a specifically designed apparatus, such as FAZIA, may be used to study the equation of state. This review summarizes the advanced characteristics of the FAZIA detector array and the achievements obtained by the FAZIA collaboration in the last 15 years.

Dynamics

10.1142/s0217751x24440081

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Constraining Hot Sources in Central Heavy-ion Collisions Below 20 MeV/$u$

Acta Physica Polonica B (2017)

S. Valdrè S. Piantelli G. Casini S. Barlini M. Ciemała

Pre-equilibrium emissions affect the production of excited systems in nuclear reactions, thus modifying their properties which enter as input parameters in the comparison with statistical models.In this contribution, we discuss this subject referring to recent results from experiments performed at Legnaro National Laboratories (Italy) with the GARFIELD apparatus complemented with other detectors.

10.5506/aphyspolb.48.635

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Citations (1)

New semi-automatic method for reaction product charge and mass identification in heavy-ion collisions at Fermi energies

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2016)

D. Gruyer E. Bonnet A. Chbihi J. D. Frankland S. Barlini

Identification

Initialization

Matrix (chemical analysis)

10.1016/j.nima.2016.11.062

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CONSTRAINTS ON THE DENSITY DEPENDENCE OF THE SYMMETRY ENERGY

International Journal of Modern Physics E (2010)

M. B. Tsang Yingxun Zhang Paweł Danielewicz M. Famiano Zhuxia Li

Collisions involving 112Sn and 124Sn nuclei have been simulated with the improved Quantum Molecular Dynamics transport model. The results of the calculations reproduce isospin diffusion data from two different observables and the ratios of neutron and proton spectra. By comparing these data to calculations performed over a range of symmetry energies at saturation density and different representations of the density dependence of the symmetry energy, constraints on the density dependence of the symmetry energy at sub-normal density are obtained. Results from present work are compared to constraints put forward in other recent analysis.

Saturation (graph theory)

10.1142/s0218301310016041

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Citations (24)