Multifragmentation process for different mass asymmetry in the entrance channel around the Fermi energy

Bellaize, N.; Lopez, O.; Wieleczko, J. P.; Cussol, D.; Auger, G.; Bacri, C.O.; Bocage, F.; Borderie, B.; Bougault, R.; Bouriquet, B.; Brou, R.; Buchet, P.; Buţă, A.; Charvet, J. L.; Chbihi, A.; Colin, J.; Dayras, R.; Cesare, N. De; Demeyer, A.; Doré, D.; Durand, D.; Frankland, J.D.; Galichet, E.; Genouin-Duhamel, E.; Gerlic, E.; Guiot, B.; Guinet, D.; Hudan, S.; Lanzalone, G.; Lautesse, P.; Lavaud, F.; Laville, J.L.; Lecolley, J.F.; Légrain, R.; Neindre, N. Le; Manduci, L.; Marie, J.; Nalpas, L.; Normand, J.; Pârlog, M.; Pawłowski, P.; Plagnol, E.; Rivet, M. F.; Rosato, E.; Roy, R.; Saint‐Laurent, F.; Steckmeyer, J.C.; Tăbăcaru, G.; Tamain, B.; Lauwe, A. Van; Tassan‐Got, L.; Vient, E.; Vigilante, M.; Volant, C.

doi:10.1016/s0375-9474(02)00988-0

Cited by 54 publications

(29 citation statements)

References 39 publications

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“…Experimental examinations of the largest-fragment charge distribution have, however, not ascertained yet such a signal up to now. The presence of bimodality has been reported for distributions of some other quantities as, e.g., the charge asymmetry between the two or three largest fragments, and the asymmetry ratio between heavy and light fragments [6,8,17,18,61]. In the ALADIN data on 197 Au + 197 Au at 1000A MeV, a bimodal distribution of Z max − Z 2 − Z 3 has been found in the transition region Z bound = 53 − 55 [18,62].…”

Section: B Remarks On Bimodalitymentioning

confidence: 93%

Distributions of the largest fragment size in multifragmentation: Traces of a phase transition

et al. 2018

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Distributions of the largest fragment charge are studied using the ALADIN data on fragmentation of 197 Au projectiles at relativistic energies. The statistical measures skewness and kurtosis of higher-order fluctuations provide a robust indication of the transition point, linked to a phase transition in the thermodynamic limit. Extensive comparisons with predictions of a bond percolation model corroborate the high accuracy of this model in reproducing the distributions as well as the whole fragmentation pattern as represented by the measured charge correlations. In analogy to percolation, the pseudocritical and critical points are identified in the fragmentation data.Questions concerning the distinction between different models and between first-and second-order phase transitions are discussed.

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Section: B Remarks On Bimodalitymentioning

confidence: 93%

Distributions of the largest fragment size in multifragmentation: Traces of a phase transition

et al. 2018

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“…[8,21,22] is used. It represents the main version used previously for successful comparisons with a variety of experimental data [6,10,11,18,[23][24][25]. We calculate the contributions of all breakup channels partitioning the system into various species.…”

Section: Statistical Approach To Multifragmentationmentioning

confidence: 99%

Theoretical study of projectile fragmentation in theSn112+Sn112and<

et al. 2015

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We analyze the production cross sections and isotopic distributions of projectilelike residues in the reactions 112 Sn + 112 Sn and 124 Sn + 124 Sn at an incident beam energy of 1 GeV/nucleon measured with the fragment separator at the GSI laboratory. Calculations within the statistical multifragmentation model for an ensemble of excited sources were performed with ensemble parameters determined previously for similar reactions at 600 MeV/nucleon. The obtained good agreement with the experiment establishes the universal properties of the excited spectator systems produced during the dynamical stage of the reaction. It is furthermore confirmed that a significant reduction of the symmetry-energy term at the freeze-out stage of reduced density and high temperature is necessary to reproduce the experimental isotope distributions. A trend of decreasing symmetry energy for large neutron-rich fragments of low excitation energy is interpreted as a nuclear-structure effect.

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“…An accurate modeling of these processes is not simple. Global features of the characteristic experimental observables, such as multiplicities, mass or charge distributions, and energy spectra or the mean energy of the fragments, have been well reproduced by both statistical multifragmentation models, such as microcanonical Metropolitan Monte Carlo model (MMMC) [1,2] and the statistical multifragmentation model (SMM) [2][3][4][5][6][7][8][9][10], and by transport-based models, such as antisymmetrized molecular dynamics (AMD) [11][12][13][14][15][16][17][18], stochastic mean field model (SMF) [19][20][21], and Improved quantum statistical model (ImQMD) [22][23][24][25][26], although they are based on quite different assumptions. The statistical models utilize a freeze-out concept.…”

Section: Introductionmentioning

confidence: 95%

Experimental reconstruction of excitation energies of primary hot isotopes in heavy ion collisions near the Fermi energy

et al. 2013

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The excitation energies of the primary hot isotopes in multifragmentation events are experimentally reconstructed in the reaction system 64 Zn + 112 Sn at 40 MeV/nucleon. A kinematical focusing method is employed to evaluate the multiplicities of the evaporated light particles associated with isotopically identified fragments with 3 Z 14. Angular distributions of the velocity spectra of light charged particles and neutrons associated with trigger isotopes are examined. A moving source fit is used to separate the kinematically correlated particles, evaporated from the parents of the detected isotopes, from the uncorrelated particles originating from other sources. The latter are evaluated experimentally relative to those in coincidence with the Li isotopes. A parameter, k, is used to adjust the yield of the uncorrelated particles for different trigger isotopes. For each experimentally detected isotope, the multiplicities, apparent temperatures, and k values for n, p, d, t, and α particles are extracted. Using the extracted values, the excitation energies of the primary hot isotopes are reconstructed employing a Monte Carlo method. The extracted excitation energies are in the range of 1 to 4 MeV/nucleon but show a significant decreasing trend as a function of A for a given Z of the isotopes. The results are compared with those of antisymmetrized molecular dynamics (AMD) and statistical multifragmentation model (SMM) simulations. While some of the experimental characteristics are predicted partially by each model, neither simulation reproduces the overall characteristics of the experimental results.

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Multifragmentation process for different mass asymmetry in the entrance channel around the Fermi energy

Cited by 54 publications

References 39 publications

Distributions of the largest fragment size in multifragmentation: Traces of a phase transition

Distributions of the largest fragment size in multifragmentation: Traces of a phase transition

Theoretical study of projectile fragmentation in theSn112+Sn112and<

Experimental reconstruction of excitation energies of primary hot isotopes in heavy ion collisions near the Fermi energy

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