TNPI2023 - XIX Conference on Theoretical Nuclear Physics in Italy
Il Palazzone
Cortona
The aim of this Conference is to bring together Italian theorists working in various fields of nuclear physics and related areas to discuss their latest results and confront their points of view in a lively and informal way. This offers the opportunity to stimulate new ideas and to promote collaborations between different research groups. The meeting will be held at the Palazzone, an elegant Renaissance Villa, commissioned by the Cardinal Silvio Passerini (1469-1529), Bishop of Cortona, and presently owned by the Scuola Normale Superiore di Pisa.
Topics
- Few-body systems
- Many-body systems
- Nuclear astrophysics
- Nuclear structure and nuclear dynamics
- Relativistic heavy ion collisions and quark-gluon plasma
- Structure of hadrons and hadronic matter
- Dark matter
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Strongly correlated nuclear systems (I)
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1
IS presentation: NUCSYSSpeaker: Luca Girlanda (Istituto Nazionale di Fisica Nucleare)
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2
Modelling neutrino-nucleus interactions for long baseline oscillation experiments
The status of nuclear models used in the analysis of ongoing and planned neutrino oscillation experiments, notably T2K and DUNE, will be reviewed. Recent progress in the study of semi-inclusive reactions will be presented and discussed.
Speaker: Maria Benedetta Barbaro (Istituto Nazionale di Fisica Nucleare) -
3
Nuclear models for inclusive lepton-nucleus process in the quasi-elastic and 2p-2h processes
Lepton-nucleus interaction is analyzed, in particular in the quasi-elastic region, using several nuclear models. The MEC are also included, that provide contributions in the so called 'dip region'. Both direct and exchange terms are evaluated.
Speaker: Valerio Belocchi (Istituto Nazionale di Fisica Nucleare, Università di Torino)
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1
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Coffee break
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Strongly correlated nuclear systems (II)
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4
Cluster Effective Field Theory calculation of electromagnetic breakup reactions with Lorentz Integral Transform method
The inverse process of ${}^{9}\mathrm{Be}$ photo-disintegration, including both sequential and direct reactions combining two $\alpha$ and a neutron into $^9\textrm{Be}$, is a reaction of astrophysical interest, because it represents an alternative path to the ${}^{12}\mathrm{C}$ formation in a neutron-rich environment. Here we present the study of the inclusive reaction $\gamma + {}^{9}\mathrm{Be} \to \alpha + \alpha + n$, in the low-energy regime, where the cross section is calculated using the Lorentz Integral Transform method [1]. Furthermore, we calculate the $^9\textrm{Be}$ three-body binding energy via the Non-Symmetrized Hyperspherical Harmonics (NSHH) method [2].
The shallow binding of ${}^{9}\mathrm{Be}$ below the $\alpha\alpha n$ three-body threshold and the deep binding of $\alpha$ indicates a clear separation of energy scales, therefore, in the low energy regime, we are allowed to study ${}^{9}\mathrm{Be}$ as a three-body clustering system interacting through effective potentials. In the literature one finds calculations where $\alpha$-$\alpha$ and $\alpha$-$n$ potentials of phenomenological character have been used; here we present an attempt to use potentials derived from Halo Effective Field Theory (EFT) [3].
In order to quantify the contributions of the one- and higher-body nuclear currents to the reaction cross section, we compute the nuclear current matrix element using either the one-body convection current [4] or the dipole operator matrix element. The reason for this twofold calculation is that, at low energy, the latter includes the contributions of the one-body convection current as well as that of higher-body currents (Siegert theorem). We will discuss the results focusing on the interplay between these two contributions, driven by the EFT parameters, and in connection with the experimental results.References
[1] V. D. Efros, et al., J. Phys. G: Nucl. Part. Phys. 34, R459 (2007).
[2] S. Deflorian, N. Barnea, W. Leidemann, and G. Orlandini, Few-Body Syst. 54, 1879 (2013).
[3] H. W. Hammer, C. Ji, and D. R. Phillips, J. Phys. G: Nucl. Part. Phys. 44, 103002 (2017).
[4] E. Filandri, Doctoral Thesis, Università di Trento (2022).Speaker: Ylenia Capitani (Università di Trento, INFN-TIFPA) -
5
Study of dark matter scattering off 2H and 4He nuclei within chiral effective field theory
We study dark matter scattering off ${}^2$H and ${}^4$He nuclei, assuming DM to be composed by weak interacting massive particles, WIMPs. In order to parametrize the WIMP-nucleon interaction the chiral effective field theory ($\chi$EFT) approach is used. Considering only interactions invariant under parity, charge conjugation and time reversal, we examine five interaction types: scalar, pseudoscalar, vector, axial and tensor. Scattering amplitudes between two nucleons and a WIMP are calculated up to second chiral order, and used to calculate the nuclei responses. We apply this program to calculate the interaction rate as function of the WIMP mass and of the magnitude of the WIMP-quark coupling constants. From our study, we conclude that the scalar nuclear response functions result much greater than the others due to theirs large combination of low energy constants. We also verify that the leading order contributions are dominant in this low energy process.
Speaker: Elena Filandri -
6
Recent Developments in $\beta$ decay studies within the Nuclear Shell Model
The necessity of calculating reliable nuclear matrix elements for neutrinoless double $\beta$ decay has further stimulated the research on the mechanisms responsible for the renormalization of the $\beta$-decay operator. We tackle this point using the many-body perturbation theory to derive effective Hamiltonian and operators for nuclear shell model calculations. Here, I will present recent results obtained for medium-mass nuclei, discussing the effect of the renormalization for both allowed and forbidden $\beta$-decay transitions.
Speaker: Giovanni De Gregorio (Istituto Nazionale di Fisica Nucleare)
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4
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Hadron Physics (I)
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7
IS Presentation: NINPHASpeaker: Francesco Murgia (Istituto Nazionale di Fisica Nucleare)
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7
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Lunch
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Hadron Physics (II)
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8
The EMC effect of light nuclei within the light-front Hamiltonian dynamics
In this talk I will discuss the calculation of the so called European Muon Collaboration (EMC) effect for light-nuclei. To this aim the nuclear structure is described within the relativistic Light-Front (LF) approach. Thanks to this choice, calculations fulfill Poincaré covariance, macroscopic locality, number of particles and momentum sum rules. The procedure has been applied to electron deep inelastic scattering (DIS) on He3 [1], H3 and He4 targerts in the Bjorken limit and in the valence region. The main theoretical ingredient for the calculations is the LF nuclear spectral function which can be related to the momentum distribution. As inputs, use has been made of the nuclear wave-functions obtained from the phenomenological Av18 + UIX potential and the chiral potentials called NVIa +3N and NVIb +3N. The evaluated momentum distribution has been used to calculate the structure functions of the considered nuclei. Our analysis predicts a sizable EMC effect [2]. Results are rather independent with respect to the use of different parametrizations of the nucleon DIS structure functions and the nuclear potentials. To our knowledge these are first realistic calculations of the EMC effect, for different targets, which fulfills Poincaré covariance and thus preserving all the fundamental sum rules. For these reasons, this is a relevant study also in view of the present and future experimental scenarios.
REFERENCES
[1] E. Pace, M. Rinaldi, G. Salme', S. Scopetta, PLB 839 (2023) 137810
[2] F. Fornetti, E. Pace, M. Rinaldi, G. Salme', S. Scopetta and M. Viviani, in prep.
Speaker: Matteo Rinaldi (Istituto Nazionale di Fisica Nucleare) -
9
A global fit of unpolarised quark TMD PDFs at N3LL
Building maps of the internal partonic structure of nucleons is a crucial step towards understanding the interactions between quarks and gluons and the phenomenon of confinement.
In this talk I will present an extraction of unpolarized transverse-momentum-dependent parton distribution and fragmentation functions, based on more than two thousand data points from several experiments for two different processes: Semi-Inclusive Deep-Inelastic Scattering and Drell-Yan lepton-pair production.
The baseline analysis is performed using the Monte Carlo replica method and resumming large logarithms at N$^3$LL accuracy: the resulting description of the data is very good ($\chi^2/N_{data}$=1.06).
The availability of TMD analyses at increasing precision will be essential in guiding detector design and feasibility studies for the future Electron Ion Collider, and will also have a strong impact on precision measurements of observables particularly sensitive to the hadron structure, such as $W$mass measurements at hadron colliders.
Speaker: Giuseppe Bozzi (University of Cagliari and INFN, Cagliari) -
10
Heavy Barions and new Interacting Boson Fermion Fermion Model results
In the first part of the presentation, we present a study of the spectra and strong decay widths of heavy baryons. The masses of single heavy baryons up to the D-wave are calculated within a constituent quark model, employing both the three-quark and quark-diquark schemes. We calculated the decay widths of the ground and excited single heavy baryons into the heavy single baryon-(vector/pseudoscalar) meson pairs and the (octet/ decuplet) baryon-(pseudoscalar/vector) heavy meson pairs. Moreover, we discuss why the presence or absence of the $\rho$-mode excitations in the experimental spectrum is the key to distinguishing between the quark-diquark and three-quark behaviours, as it was originally pointed out in \cite{Santopinto2019}.
Our quantum number assignments and predictions for mass spectra and strong-decay widths are in agreement with the available data \cite{Bijker:2020tns,Garcia-Tecocoatzi:2022zrf,Garcia-Tecocoatzi:2023btk}. Hence, our findings provide valuable guidance for future measurements in experiments conducted at LHC, Belle, and Belle II.In the second part of this talk, we present a new application of the Interacting Boson Fermion-Fermion Model (IBFFM) for describing double charge exchange reactions. The study of double charge exchange reactions induced by heavy ions involving candidate nuclei for neutrinoless double beta decay is a complex task carried out by the NUMEN collaboration \cite{NUMEN:2022ton}. This investigation faces the intricacies of complex odd-odd intermediate nuclei in sequential double charge exchange processes. We offer a comprehensive description of heavy odd-odd nuclei using the (IBFFM). Additionally, we outline the methodology for describing transfer operators within this framework. Finally, we explore the potential applications of our results in future reaction codes for describing double charge exchange reactions. "
\begin{thebibliography}{100}
\bibitem{Santopinto2019}
E.~Santopinto, A.~Giachino, J.~Ferretti, H.~Garc{\'i}a-Tecocoatzi, M.A.
Bedolla, R.~Bijker, E.~Ortiz-Pacheco, The European Physical Journal C
\textbf{79}(12), 1012 (2019).\bibitem{Bijker:2020tns}
R.~Bijker, H.~Garcia-Tecocoatzi, A.~Giachino, E.~Ortiz-Pacheco and E.~Santopinto,
%``Masses and decay widths of \ensuremath{\Xi}c/b and \ensuremath{\Xi}c/b' baryons,''
Phys. Rev. D \textbf{105} (2022) no.7, 074029
doi:10.1103/PhysRevD.105.074029
[arXiv:2010.12437 [hep-ph]].\bibitem{Garcia-Tecocoatzi:2022zrf}
H.~Garcia-Tecocoatzi, A.~Giachino, J.~Li, A.~Ramirez-Morales and E.~Santopinto,
%``Strong decay widths and mass spectra of charmed baryons,''
Phys. Rev. D \textbf{107} (2023) no.3, 034031
doi:10.1103/PhysRevD.107.034031
[arXiv:2205.07049 [hep-ph]].\bibitem{Garcia-Tecocoatzi:2023btk}
H.~Garc\ia-Tecocoatzi, A.~Giachino, A.~Ramirez-Morales, A.~Rivero-Acosta, E.~Santopinto and C.~A.~Vaquera-Araujo, submitted to PRD,
%``Decay widths and mass spectra of single bottom baryons,''
[arXiv:2307.00505 [hep-ph]].\bibitem{NUMEN:2022ton}
F.~Cappuzzello, H.~Garcia-Tecocoatzi, E.~Santopinto, \textit{et al.} [NUMEN],
%``Shedding light on nuclear aspects of neutrinoless double beta decay by heavy-ion double charge exchange reactions,''
Prog. Part. Nucl. Phys. \textbf{128}, 103999 (2023)
doi:10.1016/j.ppnp.2022.103999
\end{thebibliography}Speaker: Hugo Garcia Tecocoatzi (Istituto Nazionale di Fisica Nucleare) -
11
Solving the homogeneus Bethe-Salpeter equation with a quantum annealer
This work aims to solve the Bethe-Salpeter equation (BSE) [1] of two massive scalars bound by the exchange of a massive scalar (solved in Ref. [2] with classical computation) with a Quantum Annealer (QA). One can transform the BSE into a non-symmetric generalized eigenvalue problem (GEVP) (see Ref. [2] for details). For our scope, we are interested to determine only in the maximum and minimum real eigenvalues, with the corresponding eigenvectors, so we have to solve a suitable quadratic minimization problem. After transforming the non symmetric GEPV into a Quadratic Unconstrained Binary Optimization (QUBO) form, the only type of problem manageable by the QA, we have applied a hybrid algorithm: first, we classically reduced the GEVP to a standard eigenvalue problem, then, we used the QA to solve the variational problem. We started with the approach of Ref. [5] for symmetric matrices and we generalized the algorithm for the non-symmetric case, which notably involves complex eigenvalues (see Ref. [6] for details). We are studying how the algorithm scales with the dimension of the matrices involved in the problem to explore the possible advantages of quantum computation compared to the classical one. We want to remark that the GEVP is a problem of general interest, so the results we will obtain could be relevant for a large area of fields. Our code is running on the D-Wave QA, thanks to the agreement D-Wave-CINECA[3], in the context of an international project approved by Q@TN (INFN-UNITN-FBK-CNR)[4]. We are performing the benchmarking and the analysis of the statistical distribution of the results through different parameters of the algorithm by running the algorithm with a simulated annealing sampler[7].
[1] E. E. Salpeter and H. A. Bethe, A Relativistic Equation for Bound-State Problems, Phys. Rev. 84, 1232 (195)
[2] T. Frederico, G. Salmè, and M. Viviani, Quantitative studies of the homogeneous Bethe-Salpeter equation in Minkowski space, Phys. Rev. D 89, 016010 (2014)
[3] https://www.quantumcomputinglab.cineca.it/en/2021/05/12/collaboration-agreement-between-cineca-and-d-wave-for-the-distribution-in-italy-of-quantum-computing-resources/
[4] https://quantumtrento.eu/
[5] B. Krakoff, S. M. Mniszewski, and C. F. A. Negre, A QUBO algorithm to compute eigenvectors of symmetric matrices, (2021), arXiv:2104.11
[6] S. Alliney, F. Laudiero, and M. Savoia, A variationaltechnique for the computation of the vibration frequencies of mechanical systems governed by nonsymmetric matrices, Applied mathematical modelling 16, 148 (1992)
[7] Neal, Radford M. "Annealed importance sampling." Statistics and computing 11 (2001): 125-139.Speaker: Filippo Fornetti (Istituto Nazionale di Fisica Nucleare) -
12
The 3He spin-dependent structure functions within the Light-front Hamiltonian Dynamics
In this talk I will present the results of the calculations of the spin-dependent structure functions (SSFs) of the 3He nucleus.
These quantities parametrize the hadronic tensor entering the deep inelastic scattering cross-section involving polarized beams and targets. In particular, the SSFs encode
relevant information on the spin structure of the target. In this analysis we calculate the 3He SSFs [1] within the relativistic Light-Front approach successfully tested to evaluate the 3He EMC effect [2]. In this framework, the calculation fulfills Poincaré covariance, macroscopic locality, number of particles and momentum sum rules.
As nuclear input use has been made of the realistic 3He wave-functions obtained from
the phenomenological Av18 + UIX potential. Moreover, a procedure to extract the neutron SSFs from those of the 3He and the proton is also proposed. Finally, I show that the calculations here discussed are in excellent agreement with the present data for the 3He SSFs.
Hence, this analysis could be very relevant in particular for the future experimental program of, e.g., the Electron ion Collider, where processes off polarized 3He targets are planned.REFERENCES
[1] E. Proietti, F. Fornetti, E. Pace, M. Rinaldi, G. Salmè and S. Scopetta, in preparation
[2] E. Pace, M. Rinaldi, G. Salme', S. Scopetta, PLB 839 (2023) 137810
Speaker: Eleonora Proietti (Istituto Nazionale di Fisica Nucleare)
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8
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Coffee break
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Compact stars
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13
Presentation of IS: NEUMATTSpeaker: Giuseppe Pagliara (Istituto Nazionale di Fisica Nucleare)
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14
Equation of state of dense matter for application to binary neutron star mergers
I will review the various ways of deriving an equation of state (EOS) of dense matter both at zero and finite temperature, according to the possible presence of exotic degrees of freedom like hyperons and deconfined quarks. I will then discuss the need for an accurate knowledge of such EOS in order to describe astrophysical systems of actual interest like binary neutron star mergers and supernova explosions.
Speaker: Domenico Logoteta -
15
Neutron star properties from gravitational-wave observations of r-modes and post-merger events
Gravitational wave events involving neutron stars provide interesting information of their interiors. In this talk I will not focus on the compact binary inspirals (GW170817-type events), related to the measurements of the tidal deformability of the components, but present instead other types of observations expected in the future: r-modes from rotating neutron stars, as well as the signals related to post-merger emission.
Speaker: Michal Stanislaw Bejger (Istituto Nazionale di Fisica Nucleare) -
16
Effect of composition fluctuations in quark nucleation
At the typical conditions of compact objects and related phenomena, exotic degrees of freedom such as free quarks are expected. The deconfinement of quarks in hadronic matter begins after the first seed of quark matter is created. This process is called nucleation, which occurs by local thermal or quantum fluctuations when the hadronic phase is metastable. I will initially present the nucleation conditions in hadronic stars in the two-family scenario. Finally, I will show a new possible framework for the study of nucleation that considers thermal fluctuations in the composition of hadronic matter occurring at finite temperatures.
Speaker: Mirco Guerrini (Istituto Nazionale di Fisica Nucleare) -
17
Glitches in rotating supersolids
Glitches, spin-up events in neutron stars, are of prime interest as they reveal properties of nuclear
matter at subnuclear densities. We numerically investigate the glitch mechanism using analogies
between neutron stars and magnetic dipolar gases in the supersolid phase. In rotating neutron stars,
glitches are believed to occur when many superfluid vortices unpin from the interior, transferring
angular momentum to the stellar surface. In the supersolid analogy, we show that a glitch happens
when vortices pinned in the low-density inter-droplet region abruptly unpin. These supersolid
glitches show remarkable parallels with neutron star glitches: they are characterized by a rapid
spin-up followed by a long post-glitch spin-down due to relaxation towards a steady state. Dipolar
supersolids offer an unprecedented possibility to test both the vortex and crystal dynamics during a
glitch. Here, we explore the glitch dependence on the supersolid quality, finding strong suppression
at the supersolid-to-solid transition. This provides a tool to study glitches originating from different
radial depths of a neutron star. Benchmarking our theory against neutron star observations, our
work will open a new avenue for the quantum simulation of stellar objects from Earth.Speaker: Silvia Trabucco (GSSI, INFN-LNGS)
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13
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Invited session (I): Microscopic optical potentials derived at the first order of the multiple scattering theoryConvener: Matteo Vorabbi
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Nuclear structure and reactions (I)
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19
Quantum computing for nuclear physics
With the recent experimental realization of quantum computing devices containing tens to hundreds of qubits and fully controllable operations, the theoretical effort in designing efficient quantum algorithms for a variety of problems has seen a tremendous growth worldwide. In this talk I will discuss the potential impact of quantum computing for application in nuclear physics and present some recent result of quantum simulations for simple nuclear models on current generation devices.
Speaker: Alessandro Roggero (Istituto Nazionale di Fisica Nucleare) -
20
Digital quantum computing for collective neutrino oscillations
Studies of neutrinos from astrophysical environments such as core-collapse supernovae, neutron star mergers and the early universe provide a large amount of information about various phenomena occurring in them. The description of the flavor oscillation is a crucial aspect for such studies, since the physics of matter under extreme conditions is strongly flavor-dependents. The neutrino flavor changes under the effect of 3 contributions: the vacuum oscillation, the interaction with the electrons of the surrounding matter, and the collective oscillations due to interactions between different neutrinos. This last effect adds a non-linear contribution to the equations of motion, making the exact simulation of such a system inaccessible from any current classical computational resource.
Our goal is to describe the real time evolution of a system of many neutrinos by implementing the unitary propagator $U(t) = e^{-iHt}$ using quantum computation and paying attention to the fact that the flavor Hamiltonian, in the presence of neutrino-neutrino term, presents an all-to-all interaction that makes the implementation of $U(t)$, into a quantum algorithm, strongly dependent on the qubit topology. In this contribution we present an efficient way to simulate the coherent collective oscillations of a system of $N$ neutrinos motivating the benefits of full-qubit connectivity which allows for more freedom in gate decomposition and a smaller number of quantum gates making simulation on near-term quantum devises more feasible. We present the results obtained from a real quantum simulation on a trapped-ions based quantum machine.
Speaker: Valentina Amitrano (Istituto Nazionale di Fisica Nucleare)
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Coffee break
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Nuclear structure and reactions (II)
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21
Microscopic theory of infinite nuclear matter and connections to the nuclear energy functional
In this talk, we will present our work at the interface between density functional theory (DFT) and ab initio theory. In particular, we will focus on infinite nuclear matter, that we simulate using a description based on a finite number of nucleons, and discuss three research directions:
1. a new ab initio Self-consistent Green's function (SCGF) approach, based on the algebraic diagrammatic construction (ADC) approximation scheme that has proved successful in finite nuclei, is applied to determine the equation of state (EOS) of nuclear matter using chiral interactions [1];
2. we go beyond homogeneous matter, and present results for nuclear matter perturbed by an external static potential, the so-called static response problem [2], within the DFT method [3] and, at a preliminary level, within Quantum Monte Carlo;
3. finally, we present our program aimed at the construction of ab initio-based energy density functionals (EDFs) [4], and discuss how the static response offers in principle the possibility to gain information on the surface terms of the EDF ab initio.References:
[1] C. Barbieri and A. Carbone, Lect. Notes Phys. 936, 571 (2017)
[2] M. Buraczynski et al., Physics Letters B 818, 136347 (2021)
[3] F. Marino et al., Phys. Rev C. 107, 044311 (2023)
[4] F. Marino et al., Phys. Rev. C 104, 024315 (2021)Speaker: Francesco Marino (Istituto Nazionale di Fisica Nucleare) -
22
Systematics of reaction cross sections from double folding and single folding optical potentials
The study of knockout reactions in which exotic nuclei are used as projectiles, is a hot research topic. We evaluate the accuracy of the description of the core-target interaction, by comparing theoretical and experimental reaction cross sections for a large dataset of knockout reactions carried out with light projectiles on a 9Be target. Our results show that single-folded potential, derived from a phenomenological optical potential and projectile densities, lead to cross sections which are larger and in better agreement with data, compared with double-folded potentials. Moreover, the absorption radius parameter extracted from S matrices has a stable value for all projectile masses, indicating a clear separation between the region of surface reactions and the region of strong absorption.
I will also briefly describe my contribution to the development of the “Theo4Exp Virtual Access Infrastructure” in the framework of the EU project EuroLabs. This aim of the project is the creation of user-friendly open-access platform for a variety of computer codes to be used by the physics community, and in particular by experimental nuclear physicists. I am presently working at the Theo4Exp Milano node. I have just completed the installation of a spherical HF plus RPA code that allows studying multipole excitations, and I plan to extend the platform by installing other codes like a shell-model one.
Speaker: Imane Moumene (University of Milano)
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21
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Invited session (II): Molecular Modelling of Biological SystemsConvener: Giuseppe Brancato
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Lunch
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Nuclear structure and reactions (III)
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23
Clustering and two-body correlations within extended density functional approaches
The formation of nuclear clusters constitutes an essential feature for the construction of global and unified equation-of-state (EoS) for nuclear matter. They emerge as many-body correlations, which can be attributed to the nucleon-nucleon (NN) interaction, and exist at sub-saturation densities in nuclear matter.
Phenomenological models that make use of energy density functionals (EDFs) offer a convenient approach to account for the presence of these bound states of nucleons when clusters are introduced as additional degrees of freedom. However, these models are constructed in such a way that clusters dissolve when the density approaches the nuclear saturation density, so that only nucleons survive as independent quasi-particles at higher densities. These models reveal thus inconsistencies with recent findings that evidence the existence of sizeable NN short-range correlations (SRCs) even at larger densities.
In our work, we propose a novel approach which allows, within the EDF framework, for an explicit treatment of SRCs at supra-saturation densities, by using effective quasi-clusters immersed in dense matter as a surrogate for correlations. Our idea is to embed the SRCs within generalized relativistic energy density functionals through the introduction of suitable in-medium modifications of the cluster properties. As a first exploratory step, the example of a quasi-deuteron in a relativistic mean-field model with density dependent couplings is explored. A full covariant and self-consistent scheme, based on the two-body Dirac equations, is moreover proposed to explicitly determine the many-body wave function of the quasi-deuteron in the medium.
Some parameterizations of the cluster mass shift at zero temperature, as constrained by experimental results for the effective deuteron fraction in nuclear matter near saturation and by microscopic many-body calculations in the low-density limit, are derived for all baryon densities. Novel effects on some thermodynamic quantities, such as the matter incompressibility, the symmetry energy and its slope, are finally discerned.
Implications in the widest scope of astrophysical applications are envisaged and the impact of these studies for general aspects of reactions dynamics, such as the clustering processes emerging in heavy-ion collisions, will be also discussed.
Speaker: Stefano Burrello (Istituto Nazionale di Fisica Nucleare) -
24
Kinetic approach of light-nuclei production in intermediate-energy heavy-ion collisions
We develop a kinetic approach to the production of light nuclei up to mass number A = 4 in intermediate-energy heavy-ion collisions by including them as dynamic degrees of freedom. The conversions between nucleons and light nuclei during the collisions are incorporated dynamically via the breakup of light nuclei by a nucleon and their inverse reactions. We also include the Mott effect on light nuclei, i.e., a light nucleus would no longer be bound if the phase-space density of its surrounding nucleons is too large. With this kinetic approach, we obtain a reasonable description of the measured yields of light nuclei in central Au+Au collisions at energies of 0.25 - 1.0A GeV by the FOPI collaboration. Our study also indicates that the observed enhancement of the α-particle yield at low incident energies can be attributed to a weaker Mott effect on the α-particle, which makes it more difficult to dissolve in nuclear medium, as a result of its much larger binding energy.
Speaker: Rui Wang (Istituto Nazionale di Fisica Nucleare)
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23
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Invited session (III): Precise tests of the strong interaction among hadrons via femtoscopyConvener: Oton Vazquez Doce
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In ricordo
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27
In ricordo di Gianni Fiorentini e Pier PizzocheroSpeaker: Giuseppe Pagliara
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16:50
Coffe Break
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Riunione Generale
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Heavy-ion collisions: (I)
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29
A Catania-Goa-Turin’s tale of charm and beauty: recent advances on heavy quarks in high-energy nuclear collisionsSpeaker: Marco Ruggieri (Catania University)
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30
Heavy-ion collisions and critical dynamicsSpeaker: Eduardo Grossi (Istituto Nazionale di Fisica Nucleare)
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31
From OQS to Quantum Trajectories for QuarkoniaSpeaker: Jorge Manuel Martínez Vera (Istituto Nazionale di Fisica Nucleare)
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10:50
Coffe Break
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Heavy-ion collisions: (II)
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32
Gluon production in high-energy proton-nucleus collisionsSpeaker: Gabriele Parisi
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33
Dynamical Attractors in a Full Transport ApproachSpeaker: Vincenzo Nugara (Istituto Nazionale di Fisica Nucleare)
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34
Spin polarization and spin alignment in relativistic heavy-ion collisionsSpeaker: Xin-Li Sheng (Istituto Nazionale di Fisica Nucleare)
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32
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