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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Characterization of resistive Micromegas detectors for the upgrade of the T2K Near Detector Time Projection Chambers

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2021)

D. Attié M. Batkiewicz P. Billoir Adrien Blanchet A. Blondel

MicroMegas detector

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Resistive touchscreen

Time projection chamber

Characterization

10.1016/j.nima.2021.166109

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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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Analysis of test beam data taken with a prototype of TPC with resistive Micromegas for the T2K Near Detector upgrade

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2023)

D. Attié O. Ballester M. Batkiewicz P. Billoir Adrien Blanchet

MicroMegas detector

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DESY

Time projection chamber

Resistive touchscreen

10.1016/j.nima.2023.168248

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Optical and Scintillation Properties of Polydimethyl-Diphenylsiloxane Based Organic Scintillators

IEEE Transactions on Nuclear Science (2010)

A. Quaranta S. Carturan T. Marchi V.L. Kravchuk F. Gramegna

Polysiloxane based scintillators with high light yield have been synthesized. The polymer consists in cross-linked polydimethyl-co-diphenylsiloxane with different molar percentages of phenyl units. 2,5-diphenyl oxazole (PPO) and 2,5-bis(5-ter-butyl-2-benzoxazolyl)thiophene (BBOT) have been dispersed in the polymer as dopants. The energy transfer and scintillation capabilities have been investigated, for two different amounts of phenyl groups in the polymer network and for different concentrations of dye molecules, by means of fluorescence spectroscopy, ion beam induced luminescence (IBIL) and scintillation yield measurements with ¿ particles from an ²⁴¹ Am source. The luminescence features and the scintillation yields have been correlated to the composition of the scintillators.

Quantum yield

10.1109/tns.2010.2042817

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Proposal to the ISOLDE and Neutron Time-of-Flight Committee Spectroscopy of particle-phonon coupled states in 133 Sb

G. Benzoni G. Bocchi S. Bottoni A. Bracco A. I. Morales

Time-of-Flight

Particle (ecology)

Neutron spectroscopy

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Dense Nuclear Matter Equation of State from Heavy-Ion Collisions

arXiv (Cornell University) (2023)

Agnieszka Sorensen Kshitij Agarwal K. W. Brown Z. Chajȩcki Paweł Danielewicz

The nuclear equation of state (EOS) is at the center of numerous theoretical and experimental efforts in nuclear physics. With advances in microscopic theories for nuclear interactions, the availability of experiments probing nuclear matter under conditions not reached before, endeavors to develop sophisticated and reliable transport simulations to interpret these experiments, and the advent of multi-messenger astronomy, the next decade will bring new opportunities for determining the nuclear matter EOS, elucidating its dependence on density, temperature, and isospin asymmetry. Among controlled terrestrial experiments, collisions of heavy nuclei at intermediate beam energies (from a few tens of MeV/nucleon to about 25 GeV/nucleon in the fixed-target frame) probe the widest ranges of baryon density and temperature, enabling studies of nuclear matter from a few tenths to about 5 times the nuclear saturation density and for temperatures from a few to well above a hundred MeV, respectively. Collisions of neutron-rich isotopes further bring the opportunity to probe effects due to the isospin asymmetry. However, capitalizing on the enormous scientific effort aimed at uncovering the dense nuclear matter EOS, both at RHIC and at FRIB as well as at other international facilities, depends on the continued development of state-of-the-art hadronic transport simulations. This white paper highlights the essential role that heavy-ion collision experiments and hadronic transport simulations play in understanding strong interactions in dense nuclear matter, with an emphasis on how these efforts can be used together with microscopic approaches and neutron star studies to uncover the nuclear EOS.

Nuclear astrophysics

10.48550/arxiv.2301.13253

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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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EPICS Based Control System for SPES Tape Station for Beam Characterization: Motion System and Controls

HAL (Le Centre pour la Communication Scientifique Directe) (2019)

Maurizio Montis Justin Abraham B. Génolini Mauro Giacchini T. Marchi

10.18429/jacow-icalepcs2019-mopha097

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Work ability and ageing among hotel workers in Venice

Ergonomia (2007)

Paul Maurice Conway Samantha Sartori R Montagnani M.V. Alissandri T. Marchi

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