Exploring isospin effects on the level density parameter

Marini, P.; Rivet, M. F.; Borderie, B.; Neindre, N. Le; Chbihi, A.; Verde, G.; Wieleczko, J. P.

doi:10.1051/epjconf/20100204003

Cited by 6 publications

(3 citation statements)

References 20 publications

(22 reference statements)

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“…Some preliminary data were published, which made use of the INDRA response alone, without identification or calibration [68,69]. The fusion-evaporation cross-section seems to decrease by a factor ∼2 for the system close to the drip-line whereas it is constant for the four other systems.…”

Section: Level Density Parameter Of Pd Nuclei From Stability To the Pmentioning

confidence: 99%

Isospin effects and symmetry energy studies with INDRA

et al. 2014

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Abstract. The equation of state of asymmetric nuclear matter is still controversial, as predictions at subsaturation as well as above normal density widely diverge. We discuss several experimental results measured in heavy-ion collisions with the INDRA array in the incident energy range 5-80 A MeV. In particular an estimate of the density dependence of the symmetry energy is derived from isospin diffusion results compared with a transport code: the potential part of the symmetry energy linearly increases with the density. We demonstrate that isospin equilibrium is reached in mid-central collisions for the two reactions Ni+Au at 52 A MeV and Xe+Sn at 32 A MeV. New possible variables and an improved modelization to investigate symmetry energy are discussed.PACS. 2 5.70.Pq -2 4.60.Ky

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Section: Level Density Parameter Of Pd Nuclei From Stability To the Pmentioning

confidence: 99%

Isospin effects and symmetry energy studies with INDRA

et al. 2014

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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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Signals of Bose Einstein condensation and Fermi quenching in the decay of hot nuclear systems

et al. 2016

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We report on first experimental observations of nuclear fermionic and bosonic components displaying different behaviours in the decay of hot Ca projectile-like sources produced in mid-peripheral collisions at sub-Fermi energies. The experimental setup, constituted by the coupling of the INDRA 4π detector array to the forward angle VAMOS magnetic spectrometer, allowed to reconstruct the mass, charge and excitation energy of the decaying hot projectile-like sources. By means of quantum-fluctuation analysis techniques, temperatures and local partial densities of bosons and fermions could be correlated to the excitation energy of the reconstructed system. The results are consistent with the production of dilute mixed systems of bosons and fermions, where bosons experience higher phase-space and energy density as compared to the surrounding fermionic gas. Our findings recall phenomena observed in the study of Bose condensates and Fermi gases in atomic traps despite the different scales

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Exploring isospin effects on the level density parameter

Cited by 6 publications

References 20 publications

Isospin effects and symmetry energy studies with INDRA

Isospin effects and symmetry energy studies with INDRA

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

Signals of Bose Einstein condensation and Fermi quenching in the decay of hot nuclear systems

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