Multifragmentation of a very heavy nuclear system (II): bulk properties and spinodal decomposition

Frankland, J.D.; Borderie, B.; Colonna, M.; Rivet, M. F.; Bacri, C.O.; Chomaz, Ph.; Durand, D.; Guarnera, A.; Pârlog, M.; Squalli, M.; Tăbăcaru, G.; Auger, G.; Bellaize, N.; Bocage, F.; Bougault, R.; Brou, R.; Buchet, P.; Chbihi, A.; Colin, J.; Cussol, D.; Dayras, R.; Demeyer, A.; Doré, D.; Galichet, E.; Genouin-Duhamel, E.; Gerlic, E.; Guinet, D.; Lautesse, P.; Laville, J.L.; Lecolley, J.F.; Légrain, R.; Neindre, N. Le; Lopez, O.; Louvel, M.; Maskay, A. M.; Nalpas, L.; Nguyen, A.D.; Plagnol, E.; Rosato, E.; Saint‐Laurent, F.; Salou, S.; Steckmeyer, J.C.; Tamain, B.; Tassan‐Got, L.; Tirel, O.; Vient, E.; Volant, C.; Wieleczko, J. P.

doi:10.1016/s0375-9474(00)00607-2

Cited by 78 publications

(100 citation statements)

References 53 publications

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“…The final charge distribution, obtained after secondary de-excitation has been taken into account [25], is shown for the simulations including fluctuations (full histogram). We remark that the final charge distribution is in good agreement with the results obtained with the BOB method [7] and with experimental data [26].…”

Section: Presentation Of the Results And Discussionsupporting

confidence: 89%

“…We would like to notice that the results reported here are in qualitative agreement with the trend observed in experimental data [26,30]. For the reaction at 32 MeV/A, a careful comparison between data and stochastic calculations performed with BOB can be found in Ref.…”

Section: In the Inset We Show The Fragment Charge Density As A Funcsupporting

confidence: 89%

“…For the reaction at 32 MeV/A, a careful comparison between data and stochastic calculations performed with BOB can be found in Ref. [26]. For the same reaction the pres- ence of spinodal decomposition remnants, i.e.…”

Section: In the Inset We Show The Fragment Charge Density As A Funcmentioning

confidence: 99%

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Fragmentation path of excited nuclear systems

et al. 2004

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We perform a study of the fragmentation path of excited nuclear sources, within the framework of a stochastic mean-field approach. We consider the reaction 129 Xe + 119 Sn at two beam energies: 32 and 50 MeV/A, for central collisions. It is observed that, after the compression phase the system expands towards a dilute configuration from which it may recontract or evolve into a bubble-like structure. Then fragments are formed through the development of volume and/or surface instabilities. The two possibilities co-exist at 32 MeV/A, leading to quite different fragment partitions, while at 50 MeV/A the hollow configuration is observed in all events. Large variances are recovered in a way fully consistent with the presence of spinodal decomposition remnants. Kinematical properties of fragments are discussed and suggested as observables very sensitive to the dominant fragment production mechanism. A larger radial collective flow is observed at 50 MeV/A, in agreement with experiments.

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Section: Presentation Of the Results And Discussionsupporting

confidence: 89%

Section: In the Inset We Show The Fragment Charge Density As A Funcsupporting

confidence: 89%

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Fragmentation path of excited nuclear systems

et al. 2004

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“…In this context, nuclei appear as possible candidates to observe liquid-gas phase transition in finite quantum system. Indeed, a large variety of experimental studies [10,11,12,13,14,15,16,17,18,19,20,21,22] reports an accumulation of "evidences" of critical signals. Among them, bimodality in the charge asymmetry of fragments produced in heavy-ion reactions at Fermi energies have been recently reported for the Quasi-Projectiles (QP) isolated in peripheral reactions [21,22].…”

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confidence: 99%

Bimodality as a Signal of a Liquid-Gas Phase Transition in Nuclei?

2005

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We use the HIPSE (Heavy-Ion Phase-Space Exploration) Model to discuss the origin of the bimodality in charge asymmetry observed in nuclear reactions around the Fermi energy. We show that it may be related to the important angular momentum (spin) transferred into the quasi-projectile before secondary decay. As the spin overcomes the critical value, a sudden opening of decay channels is induced and leads to a bimodal distribution for the charge asymmetry. In the model, it is not assigned to a liquid-gas phase transition but to specific instabilities in nuclei with high spin. Therefore, we propose to use these reactions to study instabilities in rotating nuclear droplets.PACS numbers: 25.70.Mn,64.

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“…An elegant solution is to perform a statistical analysis on the primary decay stage as predicted by a dynamical model yielding results in good agreement with experimental data. One of such models is the Stochastic Mean Field (SMF) [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Searching for statistical equilibrium in a dynamical multifragmentation path

2007

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A method for identifying statistical equilibrium stages in dynamical multifragmentation paths as provided by transport models, already successfully tested for the reaction 129 Xe+ 119 Sn at 32 MeV/u is applied here to a higher energy reaction, 129 Xe+ 119 Sn at 50 MeV/u. The method evaluates equilibrium from the point of view of the microcanonical multifragmentation model (MMM) and reactions are simulated by means of the stochastic mean field model (SMF). A unique solution, corresponding to the maximum population of the system phase space, was identified suggesting that a huge part of the available phase space is occupied even in the case of the 50 MeV/u reaction, in presence of a considerable amount of radial collective flow. The specific equilibration time and volume are identified and differences between the two systems are discussed.

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Multifragmentation of a very heavy nuclear system (II): bulk properties and spinodal decomposition

Cited by 78 publications

References 53 publications

Fragmentation path of excited nuclear systems

Fragmentation path of excited nuclear systems

Bimodality as a Signal of a Liquid-Gas Phase Transition in Nuclei?

Searching for statistical equilibrium in a dynamical multifragmentation path

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