Disassembly of an excited nuclear aggregate through sequential decay

Barbagallo, C.; Richert, J.; Wagner, P.

doi:10.1007/bf01290760

Cited by 15 publications

(22 citation statements)

References 27 publications

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“…It follows a chain of binary decays, generating at each step two new fragments which themselves may decay in two further fragments [5]. The process is numerically simulated by following the decaying system in space under the constraint that the total energy of the system is conserved at each step [6].…”

Section: Multisequential Decay Modelmentioning

confidence: 99%

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Properties of projectile-fragments in the 40Ar+27Al reaction at 44 A MeV. Comparison with a multisequential decay model

et al. 2006

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Results on projectile fragment-fragment coincidences in the forward direction and for the reaction 40 Ar+ 27 Al at 44 A.MeV are presented and compared with the predictions of two different entrance channel models, a two-body and a three-body mechanism both followed by a binary multisequential decay including fission. This analysis shows that many features of the projectile decay products are well accounted for by the binary multisequential decay model. However the results depend critically upon the initial masses and excitation energies of the primary projectile fragments. In this respect, the three-body approach underestimates the excitation energy imparted to the primary fragments whereas the two-body scenario overestimates it. The present data put strong constraints on the initial excitation energy imparted to the primary fragments which appears to be intermediate between the predictions of the two models.

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Section: Multisequential Decay Modelmentioning

confidence: 99%

“…PLF-PLF coincidences will be considered and compared with the predictions of a multisequential decay mechanism [5,6]. We first describe shortly the experimental lay-out (section 2) and present the bulk of the experimental results in section 3, giving particular emphasis to projectile fragments with Z>2.…”

Section: Introductionmentioning

confidence: 99%

Properties of projectile-fragments in the 40Ar+27Al reaction at 44 A MeV. Comparison with a multisequential decay model

et al. 2006

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“…Now, let us assume that a PE particle is emitted at a negative angle --OLV, the related CN recoils at + 0CN which is, in a large majority of cases, lower than + O F. Thus, in order to detect the EV residues at + Or, the CN has to emit more particles at negative angles than at positive. Let us (right hand side) in coincidence with heavy fragments detected at 0F=8.5 ~ The solid and dashed curves correspond to theoretical predictions derived from a statistical-decay model for protons and s-particles, respectively (see text and [15][16][17] suppose, instead, that the PE particle is emitted at + 0Lp, then the corresponding CN recoils at -0cN. To be eventually detected again at 4-OLv the CN has to emit even more particles at negative angles than in the previous geometry.…”

Section: The Light Particle Emissionsmentioning

confidence: 97%

“…As already explained, we have used a multisequential decay model [15][16][17]. This approach allows one to follow the decay chain of an excited primary fragment through a sequence of binary splitting channels.…”

Section: The Statistical Modelmentioning

confidence: 99%

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Preequilibrium versus thermalized light-charged particle emissions in the40Ar (1100MeV)+24Mg reaction. Dynamical calculations

Malki¹,

Coffin²,

Guillaume³

et al. 1991

Z. Physik A - Hadrons and Nuclei

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In an attempt to separate preequilibrium and thermalised emissions of light particles in low impact parameter heavyion collisions, the 4~ + 24Mg reaction has been studied at 27.5 MeV/nucleon. Exclusive measurements have permitted us to examine, in some detail, heavy fragments and charged particles (p, d, t, e-particle). The fragments recognized as evaporation residues have been selected and, due to inverse kinematic conditions, the related preequilibrium and statistical emissions of light particles resulting from incomplete fusion reaction appear to be distinguishable to a fair extent. This separation is fully supported by Monte Carlo calculations. Some experimental characteristics of the light particles have been examined and compared to the predictions of dynamical calculations. These calculations, associating a preequilibrium (interpreted as prompt emitted particles) model with a statistical-decay model, follow the evolution of the collision from the point of contact between the projectile and the target to the final evaporation-residue formation on an event by event basis. The predictions of these calculations have been compared to experimental data and satisfactory agreement is achieved for fragment-mass distribution, proton-energy spectra, and proton-angular distribution.

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Application of the ising model to the study of cluster multiplicities in finite excited systems

Samaddar

Richert

1989

Z. Physik A - Atomic Nuclei

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Fragmentation is expected to be an experimental signal which can give some information about the physical characteristics of finite excited systems. We try to investigate the question concerning the mechanism which governs the onset of the disassembly of such systems in connection with their internal dynamics. We restrict this study to the case where the systems are in thermodynamical equilibrium. We use the 2-dimensional Ising model as a generic model in order to calculate the multiplicities for the formation of strongly bound clusters inside the system and analyse their behaviour as a function of the temperature. The calculated observables show features which reflect the role played by the internal dynamics. The evolution of the shape of the cluster multiplicities with temperature obtained in the present study is qualitatively the same as the one which comes out through different nuclear phase space fragmentation models. PACS

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Disassembly of an excited nuclear aggregate through sequential decay

Cited by 15 publications

References 27 publications

Properties of projectile-fragments in the 40Ar+27Al reaction at 44 A MeV. Comparison with a multisequential decay model

Properties of projectile-fragments in the 40Ar+27Al reaction at 44 A MeV. Comparison with a multisequential decay model

Preequilibrium versus thermalized light-charged particle emissions in the40Ar (1100MeV)+24Mg reaction. Dynamical calculations

Application of the ising model to the study of cluster multiplicities in finite excited systems

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