Systematic study of the symmetry energy within the approach of the statistical multifragmentation model

Marini, P.; Bonasera, A.; Souliotis, G. A.; Cammarata, P.; Wuenschel, S.; Tripathi, R.; Kohley, Z.; Hagel, K.; Heilborn, L.; Mabiala, J.; May, L. W.; McIntosh, A. B.; Yennello, S. J.

doi:10.1103/physrevc.87.024603

Cited by 22 publications

(22 citation statements)

References 36 publications

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“…Further work to provide a clear relationship between secondary decay and isoscaling would be highly valued. Recently, Marini et al tested the secondary decay effects by varying the input symmetry energy coefficient (C in sym ) in the SMM model and then calculating the symmetry energy coefficient using the isoscaling and isobaric yield ratio methods (C out sym ) [74]. As shown in Fig.…”

Section: Secondary Decaymentioning

confidence: 99%

Heavy-ion collisions: Direct and indirect probes of the density and temperature dependence of Esym

Kohley

Yennello

2014

Eur. Phys. J. A

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Heavy-ion collisions provide a versatile terrestrial probe of the nuclear equation of state through the formation of nuclear matter at a wide variety of temperatures, densities, and pressures. Direct and indirect approaches for constraining the density dependence of the symmetry energy using heavy-ion collisions have been developed. The direct approach relies on scaling methods which attempt to connect isotopic fragment distributions to the symmetry energy. Using the indirect approach constraints on the equation of state are extracted from comparison of experimental results and theoretical transport calculations which utilize effective nucleon-nucleon interactions. Besides exploring the density dependence of the equation of state, heavy-ion collisions are simultaneously probing different temperature gradients of nuclear matter allowing for the temperature dependence of the symmetry energy to be examined. The current progress and open questions related to constraining the density and temperature dependence of the symmetry energy with heavy-ion collisions are discussed in the review. PACS. 25.70.-z Low and intermediate energy heavy-ion reactions -21.65.Mn Equations of state of nuclear matter -21.65.Ef Symmetry energy

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Section: Secondary Decaymentioning

confidence: 99%

Heavy-ion collisions: Direct and indirect probes of the density and temperature dependence of Esym

Kohley

Yennello

2014

Eur. Phys. J. A

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“…In fact, this eventuality allows to decouple effects related to the two classes of mechanisms that are linked to rather different nuclear matter macroscopic properties. In the last decades great efforts have been performed to extract information on the nuclear iso-vectorial forces by studying charge/mass asymmetric systems [8][9][10][11][12][13][14][15][16][17][18]. These attempts concerns both the dynamical stage and the statistical decay of the produced hot sources.…”

Section: Introductionmentioning

confidence: 99%

“…These attempts concerns both the dynamical stage and the statistical decay of the produced hot sources. In particular in this last stage the isospin and excitation energy dependence of the level density formula play a key role and it is currently under investigation [10,12,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Dipolar degrees of freedom and isospin equilibration processes in heavy ion collisions

Papa¹,

Berceanu²,

Acosta³

et al. 2015

Phys. Rev. C

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Background: In heavy ion collision at the Fermi energies Isospin equilibration processes occurring when nuclei with different charge/mass asymmetries interacts have been investigated to get information on the nucleon-nucleon Iso-vectorial effective interaction.Purpose: In this paper, for the system 48 Ca + 27 Al at 40 MeV/nucleon, we investigate on this process by means of an observable tightly linked to isospin equilibration processes and sensitive in exclusive way to the dynamical stage of the collision. From the comparison with dynamical model calculations we want also to obtain information on the Iso-vectorial effective microscopic interaction. Method:The average time derivative of the total dipole associated to the relative motion of all emitted charged particles and fragments has been determined from the measured charges and velocities by using the 4π multi-detector CHIMERA. The average has been determined for semiperipheral collisions and for different charges Z b of the biggest produced fragment. Experimental evidences collected for the systems 27 Al+ 48 Ca and 27 Al+ 40 Ca at 40 MeV/nucleon used to support this novel method of investigation are also discussed.Results: The data analysis shows a clear signature of a trend to the global Isospin equilibration of the system for increasing differences of the Z b values with respect to the projectile charge. Conclusions:The comparison with CoMD-II calculations gives the best agreement with data using a stiffness γ value for the Iso-vectorial interaction in the range γ ≃ 1−1.2. Moreover, the same comparison allows to estimate the non-negligible contribution to the global isospin equilibration process given by the un-detected emitted neutrons.

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“…Relatively high plateaus are found in μ 21 /T from the measured fragments [13,14], while the SAA results are much lower than the measured fragments, and the SAA IB-μ 21 /T from the final fragments is less sensitive to the asymmetry of the projectile. The comparison between the IB-μ 21 /T from the SAA prefragments and final fragments only verifies that the evaporation process largely modifies the results of the observable which is constructed from the fragment yield in experiments and theories, such as the isobaric yield ratio [5,11,12,33], the ratio of symmetry-energy coefficient to temperature [8][9][10], isoscaling [34], etc.…”

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confidence: 97%

“…For example, the coefficient of symmetry energy (a sym ) can be obtained via the isobaric binding energy difference [1][2][3]. In HICs above the Fermi energy, the ratio of a sym to temperature (a sym /T ) for (neutron-rich) fragments [4][5][6][7][8][9][10][11][12], the symmetry energy of colliding sources by different scaling techniques [10][11][12], the difference between chemical potentials of neutrons and protons [13,14], and the temperatures related to the measured fragments [10,15,16] are also studied via isobaric yield ratios. The name "nuclear symmetry energy" is used for nuclear matters ranging from a finite nucleus to dense nuclear matters, which has different values [10][11][12].…”

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confidence: 99%

Isobaric yield ratio difference and neutron density difference in calcium isotopes

Bai

et al. 2014

Phys. Rev. C

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The isobaric yield ratio difference between two reactions is found to equal μ 21 /T , which denotes the ratio of the difference between the neutron and proton chemical potentials to the temperature. A series of projectile fragmentation reactions induced by calcium isotopes are calculated using a modified statistical abrasion-ablation model, assuming the neutron density distribution to be the Fermi type. The μ 21 /T from the prefragments are found to be sensitive to the difference between the neutron density distributions of projectiles, while μ 21 /T from the final fragments are very similar for the reactions and insensitive to the difference between the neutron density distributions of projectiles. The μ 21 /T from the prefragments and final fragments verify that the deexcitation modifies the results largely.

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Systematic study of the symmetry energy within the approach of the statistical multifragmentation model

Cited by 22 publications

References 36 publications

Heavy-ion collisions: Direct and indirect probes of the density and temperature dependence of Esym

Heavy-ion collisions: Direct and indirect probes of the density and temperature dependence of Esym

Dipolar degrees of freedom and isospin equilibration processes in heavy ion collisions

Isobaric yield ratio difference and neutron density difference in calcium isotopes

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