Pre-Equilibrium Effects in the Secondary Particle Spectra in the Reactions With Heavy Ions

Fotina, O. V.; Eremenko, D. O.; Platonov, S. Yu.; Yuminov, O. A.; Kravchuk, V. L.; Gramegna, F.; Barlini, S.; Casini, G.; Bruno, M.; D’Agostino, M.; Wieland, O.; Bracco, A.; Camera, F.

doi:10.1142/s0218301310015588

Cited by 18 publications

(19 citation statements)

References 13 publications

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“…other theoretical models to account for this. On one side, calculations for the different systems are undergoing with the Moscow Pre−equilibrium Model (MPM) [5,14,15], which was already used to compare its predictions with previous measured data [3]. This code is based on the Hybrid Exciton Model coupled to a Statistical Decay Code (PACE2).…”

Section: Central Events: Preliminary Resultsmentioning

confidence: 99%

Clustering in light nuclei and their effects on fusion and pre – equilibrium processes.

et al. 2017

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The study of nuclear cluster states bound by valence neutrons is a field of recent large interest. In particular, it is important to study the pre-formation of α-clusters in α-conjugate nuclei and the dynamical condensation of clusters during nuclear reactions [1-5]. The NUCL−EX collaboration has recently initiated an experimental campaign of exclusive measurements of fusion−evaporation reactions with light nuclei as interacting partners. In collisions involving light systems, the low expected multiplicity of fragments increases the probability of achieving a quasi-complete reconstruction of the event. In particular the formation and decay modes of an excited 24 Mg system have been studied through two different reactions, 12 C (95 MeV)+ 12 C and 14 N (80.7 MeV)+ 10 B, which have been used to produce fused systems with nearly the same mass and excitation energy (∼60 MeV). In particular, even the de-excitation of the Hoyle state in 12 C have been studied, both in peripheral (projectiles de-excitation) and in central collisions (six α-particles channel). Moreover, a research campaign studying pre-equilibrium emission of light charged particles and cluster properties of light and medium-mass nuclei has been carried out. For this purpose, a comparative study of the three nuclear systems 18 O+ 28 Si, 16 O+ 30 Si and 19 F+ 27 Al has been recently studied using the GARFIELD+RCo 4π setup [6]. The experimental data are compared with the predictions of simulated events generated with the statistical models (GEMINI ++ and HFl) and through dynamical models like Stochastic Mean Field (SMF) and Antisymmetrized Molecular Dynamics (AMD) and filtered with a software replica of our apparatus in order to take into account the experimental conditions.

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Section: Central Events: Preliminary Resultsmentioning

confidence: 99%

Clustering in light nuclei and their effects on fusion and pre – equilibrium processes.

et al. 2017

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“…During this campaign an extra yield was observed for pre-equilibrium α-particle emission, which was not reproduced by a Hybrid Exciton Model calculation [11]. This model was using a modified version of the PACE2 code, where the main variation was the introduction of a non-equilibrium stage before the complete thermalization and compound nucleus formation.…”

Section: Previous Measurementsmentioning

confidence: 99%

Pre-equilibrium emission and its possible relation toα-clustering in nuclei

Marchi

Gramegna

Fabris

et al. 2015

EPJ Web of Conferences

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The study of nuclear states built on clusters bound by valence neutrons in their molecular configurations is a field of large interest. Clustering becomes particularly important at the dripline, where weakly bound systems prevail. For light nuclei, at an excitation energy close to the particle separation value, there are experimental evidences of such structure effects, but this is still not the case for heavier nuclear systems. Several theoretical efforts have been done in the development of pre-formation alpha-clustering models, but there is still a lack of experimental data capable to give a direct feedback. The search of alpha-cluster evidences in medium-mass systems is therefore a new challenge which can give new hints in this field of research.

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“…Experimental spectra of protons and α-particles have been compared with the predictions of Moscow Pre-equilibrium Model (MPM) [6]. This model is a modified version of the statistical code PACE2 where a non-equilibrium stage before the complete thermalization of the compoud nucleus has been inserted.…”

Section: Previous Studiesmentioning

confidence: 99%

Pre-equilibrium emission to study clustering in nuclei

et al. 2017

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Abstract. Clustering structural properties in medium-mass systems have been investigated studying the competition between the evaporation and pre-equilibrium particle emission in central collisions. At variance with light nuclei, in the case of heavier nuclei there are no experimental evidences of such structure effects, since the determination of pre-formed clusters within nuclear matter is less obvious. The two systems 16 O + 65 Cu and 19 F + 62 Ni , leading to the same compound system 81 Rb * , have been studied at the same beam velocity (16 AMeV). The experiments have been performed using the GARFIELD + RCo multi-detection system at the Legnaro National Laboratories. Recent results of the data analysis and of the comparison of the experimental data with different statistical and dynamical model calculations are reported in this contribution.

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Pre-Equilibrium Effects in the Secondary Particle Spectra in the Reactions With Heavy Ions

Cited by 18 publications

References 13 publications

Clustering in light nuclei and their effects on fusion and pre – equilibrium processes.

Clustering in light nuclei and their effects on fusion and pre – equilibrium processes.

Pre-equilibrium emission and its possible relation toα-clustering in nuclei

Pre-equilibrium emission to study clustering in nuclei

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