Search for isospin effects on nuclear level density

Brondi, A.; Nitto, A. Di; Rana, G. La; Moro, R.; Nadotchy, P.N.; Vardaci, E.; Ordine, A.; Boiano, A.; Cinausero, M.; Prete, G.; Rizzi, V.; Gelli, N.; Lucarelli, F.

doi:10.1051/epjconf/20100204002

Cited by 8 publications

(6 citation statements)

References 11 publications

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“…2) the values of (N/Z) CP are the same, whether it is calculated with or without mid-rapidity particles. This is a strong indication of isospin equilibrium for the 58 Ni+ 197 Au reaction at 52 A MeV. As far as the Xe+Sn systems are concerned, we show in fig.…”

Section: Isospin Equilibrationmentioning

confidence: 51%

“…These effects would experimentally appear as a change in the particle multiplicity and in the relative yields of the exit channels [58]. Experimentally a can not be directly measured at high energy, but the temperature T and 1/T = d ln ρ/dE * can be extracted from the exponential slope of kinetic energy spectra of evaporated particles.…”

Section: Discussionmentioning

confidence: 99%

“…In a first experiment a 58 Ni projectile accelerated at 52 and 74 A MeV by the GANIL facility bombarded 58 Ni and 197 Au targets [31][32][33]. The QP isospin variation was followed thanks to the variable…”

Section: Ni Induced Reactionsmentioning

confidence: 99%

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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: Isospin Equilibrationmentioning

confidence: 51%

Section: Discussionmentioning

confidence: 99%

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Isospin effects and symmetry energy studies with INDRA

et al. 2014

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“…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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“…These effects would experimentally appear as a change in the particle multiplicity and in the relative yields of the exit channels [4]. While a cannot be directly measured at high energy, the temperature T and 1/T = d ln ρ/dE * can be extracted from the exponential slope of kinetic energy spectra of evaporated particles.…”

mentioning

confidence: 99%

N/Z influence on the level density parameter

Adémard

Augey

Borderie

et al. 2015

EPJ Web of Conferences

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A completely exclusive experiment was performed by the INDRA collaboration to study the isospin dependence of the level density parameter. Over a large N/Z range, the fusion-evaporation charged products of 34,36,40 Ar+ 58,60,64 Ni reactions were measured and identified both in charge and mass by coupling INDRA and VAMOS spectrometer. Preliminary results obtained by combining data of both detectors are presented for the 36 Ar+ 58 Ni at 13.3 A MeV. The analysis method of relevant observables for such an ambitious investigation are discussed and the progress of the data analysis are reviewed.

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Search for isospin effects on nuclear level density

Cited by 8 publications

References 11 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

N/Z influence on the level density parameter

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