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Papa, M.; Bonanno, A.; Amorini, F.; Bonasera, A.; Cardella, G.; Pietro, A. Di; Figuera, P.; Maruyama, Toshiki; Pappalardo, G. S.; Rizzo, F.; Tudisco, S.

doi:10.1103/physrevc.68.034606

Cited by 24 publications

(3 citation statements)

References 35 publications

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“…In these first two stages of development, the model has been used to investigate processes induced by heavy-ion collisions at Fermi energies with particular reference to the excitation of the fluctuating and coherent dipolar modes, cluster production, dynamical fission processes and incomplete fusion processes. Examples of these studies are [357][358][359][360][361][362][363]).…”

Section: Pauli-blockingmentioning

confidence: 99%

Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions

Wolter,

Colonna,

Cozma

et al. 2022

Preprint

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Transport models are the main method to obtain physics information on the nuclear equation of state and in-medium properties of particles from low to relativistic-energy heavy-ion collisions. The Transport Model Evaluation Project (TMEP) has been pursued to test the robustness of transport model predictions in reaching consistent conclusions from the same type of physical model. To this end, calculations under controlled conditions of physical input and set-up were performed with various participating codes. These included both calculations of nuclear matter in a box with periodic boundary conditions, which test separately selected ingredients of a transport code, and more realistic calculations of heavy-ion collisions. Over the years, five studies have been performed within this project. In this intermediate review, we summarize and discuss the present status of the project. We also provide condensed descriptions of the 26 participating codes, which contributed to some part of the project. These include the major codes in use today. After a compact description of the underlying transport approaches, we review the main results of the studies completed so far. They show, that in box calculations the differences between the codes can be well understood and a convergence of the results can be reached. These studies also highlight the systematic differences between the two families of transport codes, known under the names of Boltzmann-Uehling-Uhlenbeck (BUU) and Quantum Molecular Dynamics (QMD) type codes. However, when the codes were compared in full heavy-ion collisions using different physical models, as recently for pion production, they still yielded substantially different results. This calls for further comparisons of heavy-ion collisions with controlled models and of box comparisons of important ingredients, like momentum-dependent fields, which are currently underway. Our evaluation studies often indicate improved strategies in performing transport simulations and thus can provide guidance to code developers. Results of transport simulations of heavy-ion collisions from a given code will have more significance if the code can be validated against benchmark calculations such as the ones summarized in this review.

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Section: Pauli-blockingmentioning

confidence: 99%

Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions

Wolter,

Colonna,

Cozma

et al. 2022

Preprint

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“…It has been shown that CoMD (as well as other codes, e.g. BNV, BUU, TDHF) predicts the development of a collective behavior during the interaction of the projectile with the target in a peripheral or semi-peripheral collision [59,60]. A certain time is necessary for a neck to develop between the projectile and the target after their contact.…”

Section: Confrontation Of Model Calculations With the Datamentioning

confidence: 99%

“…[58][59][60] and ref. therein) that the process has a collective character resembling a large amplitude dipole motion.…”

Section: Introductionmentioning

confidence: 99%

Isoscaling of heavy projectile residues andN/Zequilibration in peripheral heavy-ion collisions below the Fermi energy

et al. 2014

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The isoscaling of heavy projectile residues from peripheral heavy-ion reactions at 15-25 MeV/nucleon is employed to obtain information on the process of N/Z equilibration. Recent mass spectrometric data of projectile residues from the reactions of 86 Kr (15 MeV/nucleon) with 64,58 Ni and 124,112 Sn were first analyzed. The isotopically resolved yield distributions of the fragments in the range Z=26-39 were employed for the isoscaling analysis. The yield ratios R21(N,Z) of the fragments from each pair of systems exhibit isoscaling (i.e. an exponential dependence on the fragment neutron number N for each atomic number Z) with the isoscaling parameter α increasing with decreasing (or increasing) Z away from the projectile. This variation is related to the evolution toward N/Z equilibration with increasing energy dissipation estimated from the residue velocities. In parallel to the new heavy-residue isoscaling data of 86 Kr at 15 MeV/nucleon, our previous data at 25 MeV/nucleon for the reactions 86 Kr+ 124,112 Sn and 64 Ni+ 64,58 Ni, 64 Ni+ 124,112 Sn, as well as our data at 15 MeV/nucleon of the lighter system 40 Ar+ 64,58 Ni were analyzed in a similar way. Calculations with the stochastic nucleon-exchange model DIT (Deep Inelastic Transfer) and the microscopic many-body model CoMD (Constrained Molecular Dynamics) provided an overall fair description of data and valuable guidance for their interpretation. Interestingly, the data of the 86 Kr+Ni,Sn reactions at 15 MeV/nucleon show a retardation of the process of N/Z equilibration which, as suggested by the CoMD calculations, is indicative of the collective character of the process. This retardation is not present in the investigated systems at 25 MeV/nucleon (and the light 40 Ar+Ni systems at 15 MeV/nucleon), whose behavior is found to be consistent with stochastic nucleon exchange.

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Evolution of the giant dipole resonance properties with excitation energy

Santonocito¹,

Blumenfeld²

Dynamics and Thermodynamics With Nuclear Degrees of Freedom

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The studies of the evolution of the hot Giant Dipole Resonance (GDR) properties as a function of excitation energy are reviewed. The discussion will mainly focus on the A ∼ 100 − 120 mass region where a large amount of data concerning the width and the strength evolution with excitation energy are available. Models proposed to interpret the main features and trends of the experimental results will be presented and compared to the available data in order to extract a coherent scenario on the limits of the development of the collective motion in nuclei at high excitation energy. Experimental results on the GDR built in hot nuclei in the mass region A ∼ 60 − 70 will be also shown allowing to investigate the mass dependence of the main GDR features. The comparison between limiting temperatures for the collective motion and critical temperatures extracted from caloric curve studies will suggest a possible link between the disappearance of collective motion and the liquid-gas phase transition.

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Coherent and incoherent giant dipole resonanceγ-ray emission induced by heavy ion collisions: Study of the40Ca+48

Cited by 24 publications

References 35 publications

Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions

Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions

Isoscaling of heavy projectile residues andN/Zequilibration in peripheral heavy-ion collisions below the Fermi energy

Evolution of the giant dipole resonance properties with excitation energy

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