Analysis of charged particle emission sources and coalescence in E/A=61 MeV 36Ar + 27Al, 112Sn and 124Sn collisions

Avdeichikov, V.V.; Ghetti, R.; Helgesson, J.; Jakobsson, B.; Golubev, P.; Colonna, N.; Wilschut, H. W.

doi:10.1016/j.nuclphysa.2004.02.023

Cited by 6 publications

(1 citation statement)

References 56 publications

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“…This approximate procedure has been adopted with the aim of estimating the deuteron and triton multiplicities and While such a phenomenological approach allows us to reproduce the deuteron, triton, and α-particle spectra measured in heavy-ion collisions at intermediate energies and is a way to mimic the emission of particles originating at different timescales, the mechanism of particle production from the socalled intermediate source remains hidden in the large number of fit parameters. The intermediate source accounts, in fact, for dynamical emission described by early nucleon-nucleon collisions and by other pre-equilibrium process and it has been explained in the framework of a coalescence model where the emission of light clusters is related to the momentum-space densities of the nucleons in the collision [30,33,34].…”

Section: Reactionmentioning

confidence: 99%

Onset of quenching of the giant dipole resonance at high excitation energies

et al. 2014

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International audienceThe evolution of the giant dipole resonance (GDR) properties in nuclei of mass A=120 to 132 has been investigated in an excitation energy range between 150 and 270 MeV through the study of complete and nearly complete fusion reactions using Sn116 beams at 17A and 23A MeV from the cyclotron of the Laboratorio Nazionale del Sud impinging on C12 and Mg24 targets. γ rays and light charged particles were detected using the multi-element detector array MEDEA in coincidence with evaporation residues detected by using mass and charge identification spectrometry with telescope (MACISTE). Light-charged-particle energy spectra were analyzed within the framework of a multiple-source-emission scenario by using a fitting procedure to determine the amount of pre-equilibrium emission and deduce the excitation energies reached in the compound nuclei. A detailed analysis of the γ-ray spectra and their comparison with statistical model calculations is presented. Evidence of a quenching of the GDR gamma yield was found at 270 MeV excitation energy. The quenching effect becomes progressively more important with increasing excitation energy, as observed when the comparison is extended to data from the reaction Ar36+Mo96 at 37A MeV where hot nuclei were populated up to 430 MeV excitation energy. A coherent scenario emerges indicating the existence of a limiting excitation energy for the collective motion of about E∗/A=2.1 MeV for systems of mass A=105 to 111 while a slightly lower value was observed for nuclei of mass A∼132. The existence of a possible link between GDR disappearance and the liquid-gas phase transition is discussed

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Section: Reactionmentioning

confidence: 99%

Onset of quenching of the giant dipole resonance at high excitation energies

et al. 2014

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High-energy probes

Bonasera

Coniglione

Sapienza

Dynamics and Thermodynamics With Nuclear Degrees of Freedom

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We review some results on energetic particles production in heavy ion collisions below roughly 100 MeV/A both theoretically and experimentally. We discuss the possibility to gather information about the nuclear Equation Of State (EOS) and viscosity from data. Results on subthreshold pion, energetic photons and nucleons are discussed and contrasted to microscopic models. Important information about the first stages of the reaction are obtained by such probes. At present, we can conclude that we have at least a qualitative understanding of the processes involved when such particles are produced. However, a quantitative understanding of the data and the possibility of understanding deeply the formation mechanism, i.e. incoherent, cooperative or statistical, plus the derivation of important properties of the nuclear EOS are still missing. This calls for new data using more modern detector systems and comparison to more refined microscopic models.

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Isospin effects in two-particle correlation functions: A probe for the isospin dependence of the nuclear equation of state

Ghetti

Helgesson

2005

Nuclear Physics A

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Analysis of charged particle emission sources and coalescence in E/A=61 MeV 36Ar + 27Al, 112Sn and 124Sn collisions

Cited by 6 publications

References 56 publications

Onset of quenching of the giant dipole resonance at high excitation energies

Onset of quenching of the giant dipole resonance at high excitation energies

High-energy probes

Isospin effects in two-particle correlation functions: A probe for the isospin dependence of the nuclear equation of state

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