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Accueil > Recherche > Dynamique et Thermodynamique Nucléaire

Publications

(more recent)

[in2p3-01345974] Reaction and fusion cross sections for the near-symmetric system $^{129}$Xe+$^{nat}$Sn from $8$ to $35$ $AMeV$

20 octobre 2016

item[Background]Heavy-ion reactions from barrier up to Fermi energy. \item[Purpose]Reaction and fusion cross sections determination. Fusion reactions induced by $^129Xe$ projectiles on $^natSn$ targets for energies ranging from $8$ A.MeV to $35$ A.MeV were measured with the INDRA (...)

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[in2p3-01357772] Isospin influence on the decay modes of compound systems produced in the $^{78,86}$Kr + $^{40,48}$Ca at 10 AMeV

7 octobre 2016

The study of the decay modes competition of the compound systems produced in the collisions 78Kr+40Ca and 86Kr+48Ca at 10AMeV is presented. In particular, the N/Z entrance channel influence on the decay paths of the compound systems, directly connected to the isospin influence, is investigated. (...)

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[in2p3-01368398] A New Neutron Time-of-Flight Array for β-Decay Studies

20 septembre 2016

A new time-of-flight array for β-delayed neutron spectroscopy (En 5 MeV) is being developed with the aim of improved performance compared to existing arrays. We report on the status of this development, in particular the study of the n-γ discrimination quality with digital electronics, a (...)

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[in2p3-01341120] FAZIA applications

5 juillet 2016

The present status and the perspectives of the FAZIA project are presented. The main achievements in terms of identification thresholds and isotopic resolution are discussed, together with the adopted technical solutions. The detector is particularly well suited for the investigation of isospin (...)

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[in2p3-01294725] Alpha-particle clustering in excited expanding self-conjugate nuclei

1er juillet 2016

The fragmentation of quasi-projectiles from the nuclear reaction 40Ca + 12C at 25 MeV/nucleon was used to produce alpha-emission sources. From a careful selection of these sources provided by a complete detection and from comparisons with models of sequential and simultaneous decays, strong (...)

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[in2p3-01340242] Excited nuclear matter at Fermi energies: From transport properties to the equation of state

1er juillet 2016

Properties of excited nuclear matter are one of the main subject of investigation in Nuclear Physics. Indeed, the response of nuclear matter under extreme conditions encountered in heavy-ion induced reactions (large compression, thermal and collective excitations, isopin diffusion) around the (...)

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[in2p3-01100158] Signals of Bose Einstein condensation and Fermi quenching in the decay of hot nuclear systems

6 juin 2016

We report experimental signals of Bose-Einstein condensation in the decay of hot Ca projectilelike sources produced in mid-peripheral collisions at sub-Fermi energies. The experimental setup, constituted by the coupling of the INDRA 4$\pi$ detector array to the forward angle VAMOS magnetic (...)

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[in2p3-01316703] Isospin influence on the decay modes of the systems produced in the 78,86Kr +40,48Ca reactions at 10 AMeV

18 mai 2016

The results of the analysis of the reactions 78,86Kr +40,48 Ca at 10 AMeV are presented. The experiment was performed at the INFN Laboratori Nazionali del Sud (LNS) in Catania by using the 4π multidetector CHIMERA, with beams delivered by the Superconductive Cyclotron. The competition among the (...)

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[in2p3-01300455] Signals of Bose Einstein condensation and Fermi quenching in the decay of hot nuclear systems

12 avril 2016

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 (...)

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[in2p3-01282609] Probing clustering in excited alpha-conjugate nuclei

30 mars 2016

The fragmentation of quasi-projectiles from the nuclear reaction $^40$Ca+$^12$C at 25 MeV per nucleon bombarding energy was used to produce $\alpha$-emission sources. From a careful selection of these sources provided by a complete detection and from comparisons with models of sequential and (...)

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[in2p3-01265779] Front-end electronics for the FAZIA experiment

2 février 2016

FAZIA is a multidetector specifically designed to optimize A and Z reaction product identification in heavy-ion collision experiments. This multidetector is modular and based on three-layer telescopes made of two silicon detectors followed by a thick (10 cm) CsI(Tl) scintillator read-out by a (...)

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[in2p3-01226430] Isospin transport and reaction mechanism in nuclear reactions in the range 20–40 MeV/n

12 novembre 2015

In recent years, many efforts have been devoted to the investigation of the isospin degree of freedom in nuclear reactions. Comparing systems involving partners with different N/Z, it has been possible to investigate the isospin transport process and its influence on the final products (...)

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[in2p3-01188809] In-medium effects around the Fermi energy

8 octobre 2015

We study nuclear stopping in central collisions for heavy-ion induced reactions in the Fermi energy domain (15-100 AMeV). Using the large dataset provided by the 4π array INDRA, we determine that stopping can be directly related to the transport properties in the nuclear medium. By looking (...)

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[in2p3-01177619] The Billotron: a way to experimentally apprehend the subatomic world

18 juillet 2015

The Billotron is a device designed and built by the LPC Caen to illustrate the methods with which physicists are able to study the basic structure of matter, in particular the nucleus of the atom.

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[in2p3-01171365] From Light to Heavy Nuclear Systems, Production and Decay of Fragments Studied with Powerful Arrays

4 juillet 2015

Reactions between heavy-ions at various energy regimes produce many nuclear fragments which can be populated in highly excited states. The study of these fragments, detected at the end of their particle decay, is important to investigate nuclear forces and structure effects. In recent years (...)

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[in2p3-01168776] Isospin transport phenomena and odd-even staggering in $^{84}$Kr+$^{112,124}$Sn collisions at 35 AMeV

3 juillet 2015

Experimental results concerning isospin transport phenomena and odd-even staggering in Z and N distributions are presented. Data refer to 84Kr+112,124Sn collisions at 35AMeV and they were collected with a high resolution FAZIA telescope, able to isotopically resolve ions up to Z ∼ 20. Evidences (...)

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[in2p3-01168831] N/Z influence on the level density parameter

3 juillet 2015

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 34,36,40Ar+58,60,64Ni reactions were measured and identified both in charge and mass by (...)

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[in2p3-00985888] Recent results from INDRA

3 juillet 2015

Recent results of the INDRA collaboration are presented in this contribution. They concern the evolution of reaction dynamics from the first stage of the collision to the production of fragments. Different probes are used to evidence the stopping/transparency, collective flow and the symmetry (...)

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[in2p3-01168867] Extracting information from partially depleted Si detectors with digital sampling electronics

3 juillet 2015

A study of the identification properties and of the energy response of a Si-Si-CsI(Tl) ΔE-E telescope exploiting a partially depleted second Si stage has been performed. Five different bias voltages have been applied to the second stage of the telescope, one corresponding to full depletion, the (...)

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[in2p3-00730977] Direct evidence of α-particle condensation for the Hoyle state

3 juillet 2015

The fragmentation of quasi-projectiles from the nuclear reaction 40Ca+12C at 25 MeV/nucleon was used to produce excited states candidates to α-particle condensation. Complete kinematic characterization of individual decay events, made possible by the CHIMERA high-granularity 4π charged particle (...)

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[in2p3-01110422] Production cross sections for intermediate mass fragments from dynamical and statistical decay of projectile-like fragments in $^{124}$Sn + $^{64}$Ni and $^{112}$Sn + $^{58}$Ni collisions at 35 A MeV

3 juillet 2015

Background: In heavy-ion collisions at intermediate energies the production of light charged particles and intermediate mass fragments (IMFs) is due to different reaction mechanisms and different time scales, ranging from fast dynamical processes to statistical emission from the equilibrated (...)

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[hal-00720759] The behaviour of constrained caloric curves as ultimate signature of a phase transition for hot nuclei

3 juillet 2015

Simulations based on experimental data obtained from multifragmenting quasifused nuclei produced in central 129Xe + natSn collisions have been used to deduce event by event freeze-out properties on the thermal excitation energy range 4-12 AMeV. From these properties and temperatures deduced (...)

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[in2p3-00807742] Influence of neutron enrichment on compound system formation and decay in 78Kr+40Ca and 86Kr+48Ca reactions at 10 AMeV

3 juillet 2015

The de-excitation of medium mass nuclei 118,134Ba produced in fusion process of 78,86Kr on 40,48Ca targets at 10 AMeV is studied, in order to investigate the isospin dependence of the decay modes; the neutron enrichment of the compound nuclei is in fact expected to play an important role on the (...)

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[in2p3-00704236] Correlations between emission timescale of fragments and isospin dynamics in $^{124}$Sn+$^{64}$Ni and $^{112}$Sn+$^{58}$Ni reactions at 35 AMeV

3 juillet 2015

We present a new experimental method to correlate the isotopic composition of intermediate mass fragments (IMF) emitted at mid-rapidity in semi-peripheral collisions with the emission timescale: IMFs emitted in the early stage of the reaction show larger values of $$ isospin asymmetry, stronger (...)

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[hal-00737435] Nuclear multifragmentation time-scale and fluctuations of largest fragment size

3 juillet 2015

Distributions of the largest fragment charge, Zmax, in multifragmentation reactions around the Fermi energy can be decomposed into a sum of a Gaussian and a Gumbel distribution, whereas at much higher or lower energies one or the other distribution is asymptotically dominant. We demonstrate the (...)

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[in2p3-00987060] Isospin transport phenomena and odd-even staggering in Z and N distributions in 84Kr+112,124Sn collisions at 35AMeV

3 juillet 2015

Experimental results concerning isospin transport phenomena and odd-even staggering in Z and N distributions are presented. Data refer to 84Kr+112,124Sn collisions at 35AMeV and they were collected with a high resolution FAZIA telescope, able to isotopically resolve ions up to Z ∼ 20. Evidences (...)

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[in2p3-01027548] Competition between fusion-evaporation and multifragmentation in central collisions in Ni-58+Ca-48 reaction at 25 AMeV

3 juillet 2015

The experimental data concerning the Ni-58+Ca-48 reaction at E-lab(Ni)=25A MeV, collected by the CHIMERA 4 pi device, have been analyzed in order to investigate the competition among different reaction mechanisms for central collisions in the Fermi energy domain. The method adopted to select (...)

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[in2p3-00858339] Nuclear stopping for heavy-ion induced reactions in the Fermi Energy range : from 1-Body to 2-Body dissipation

3 juillet 2015

We address the stopping in heavy-ion induced reactions around the Fermi energy using central collisions recorded with \emphINDRA $4\pi$ array. The stopping is minimal around the Fermi energy and corresponds to the disappearance of the Mean-Field effects and the appearance of nucleon-nucleon (...)

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[in2p3-00772111] A single-chip telescope for heavy-ion identification

3 juillet 2015

A ΔE-E telescope exploiting a single silicon chip for both ΔE measurement and scintillation light collection has been tested. It is a Si-CsI(Tl) telescope tailored for mass identification of light charged particles and intermediate mass fragments. A procedure based on two different shaping (...)

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[in2p3-00966449] Decay competition for IMF produced in the collisions 78Kr+40Ca and 86Kr+48Ca at 10 A*MeV

3 juillet 2015

Decay modes of excited compound systems 118Ba and 134Ba, produced respectively in the 78Kr+40Ca and 86Kr+48Ca collisions at 10 A*MeV, are investigated. In particular, the competition between the various disintegration path of medium mass compound nuclei, formed by fusion processes, the (...)

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[in2p3-00966956] The FAZIA project in Europe: R&D phase

3 juillet 2015

The goal of the FAZIA Collaboration is the design of a new-generation 4π detector array for heavy-ion collisions with radioactive beams. This article summarizes the main results of the R&D phase, devoted to the search for significant improvements of the techniques for charge and mass (...)

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[in2p3-01120218] Low-temperature technique of thin silicon ion implanted epitaxial detectors

3 juillet 2015

A new technique of large-area thin ion implanted silicon detectors has been developed within the R&D performed by the FAZIA Collaboration. The essence of the technique is the application of a lowtemperature baking process instead of high-temperature annealing. This thermal treatment is (...)

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[in2p3-00736381] New isospin effects in central heavy-ion collisions at Fermi energies

3 juillet 2015

Isospin e ffects on multifragmentation properties were studied thanks to nuclear collisions between di fferent isotopes of xenon beams and tin targets. It is shown that, in central collisions leading to multifragmentation, the mean number of fragments and their mean kinetic energy increase with (...)

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[in2p3-00855243] Effects of irradiation of energetic heavy ions on digital pulse shape analysis with silicon detectors

3 juillet 2015

Detected energy, charge rise-time and pulse shape identfication capabilities of nTD silicon detectors under prolonged irradiation by energetic heavy ions have been studied. Sizeable effects on the amplitude and the risetime of the charge signal have been found for detectors irradiated with (...)

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[in2p3-00560905] Test of FAZIA prototypes at LNS.

3 juillet 2015

The response of a few silicon-silicon-CsI(Tl) and silicon-silicon telescopes with high quality detectors developed within the FAZIA collaboration [1] is tested in this work. The silicon detectors were manufactured from “random cut” wafers to avoid channeling effects and are characterized by a (...)

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[in2p3-01066044] In-medium effects for nuclear matter in the Fermi energy domain

3 juillet 2015

We study nuclear stopping in central collisions for heavy-ion induced reactions in the Fermi energy domain, between $15$ and $100$ A\,\textrmMeV. Using the large dataset of exclusive measurements provided by the $4\pi$ array \emphINDRA, we determine the relative degree of stopping as a function (...)

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[in2p3-00726984] Status and performances of the FAZIA project

3 juillet 2015

FAZIA is designed for detailed studies of the isospin degree of freedom, extending to the limits the isotopic identification of charged products from nuclear collisions when using silicon detectors and CsI(Tl) scintillators. We show that the FAZIA telescopes give isotopic identification up to (...)

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[in2p3-00636423] Recent results from INDRA

3 juillet 2015

We present an overview of recent results & advances within the INDRA collaboration

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[in2p3-00625615] Study and comparison of the decay modes of the systems formed in the reactions 78Kr+40Ca and 86Kr+48Ca at 10 AMeV

3 juillet 2015

The first results of the ISODEC experiment, performed at the INFN-Laboratori Nazionali del Sud (LNS) by using the CHIMERA detector, will be presented. The principal aims of this experiment is to study the competition between the various disintegration modes of 118,134Ba compound nuclei produced (...)

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[in2p3-00587352] Description of current pulses induced by heavy ions in silicon detectors (II)

3 juillet 2015

Current pulses induced in a silicon detector by 10 different heavy ion species at known energies around 10 AMeV have been sampled in time at high frequency. Their individual average shapes are quite well reproduced by a fit procedure based on our recent charge carrier collection treatment which (...)

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[in2p3-00492917] Phase diagram of the charged lattice-gas model with two types of particles

3 juillet 2015

A lattice-gas model with two types of particles, a particle-dependent short-range coupling and a long-range repulsive Coulombic interaction, is introduced. The phase diagram of an isolated finite system of 129 particles is constructed using the bimodality properties of the observables' (...)

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[in2p3-00954513] Isospin transport in 84Kr + 112;124 Sn collisions at Fermi energies with the FAZIA detector

3 juillet 2015

Isotopically resolved fragments up to Z 20 have been studied in a test experiment by the FAZIA Collaboration with a three-stage telescope. The reactions 84Kr+112Sn (n-poor) and 84Kr+124Sn (n-rich) at 35 MeV/nucleon were measured. The telescope was located near the grazing angle, so the detected (...)

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[in2p3-00860105] Isospin transport in 84Kr+112,124Sn reactions at Fermi energies

3 juillet 2015

Isospin transport phenomena in dissipative heavy ion collisions have been investigated at Fermi energies with a beam of 84Kr at 35AMeV. A comparison of the /Z of light and medium products forward-emitted in the centre of mass frame when the beam impinges on a n-poor 112Sn and a n-rich 124Sn (...)

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[in2p3-00660911] X-ray fluorescence from the element with atomic number Z = 120

3 juillet 2015

An atomic clock based on X-ray fluorescence yields has been used to estimate the mean characteristic time for fusion followed by fission in reactions 238U + 64Ni at 6.6 MeV/A. Inner shell vacancies are created during the collisions in the electronic structure of the possibly formed Z=120 (...)

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[in2p3-00762387] β-delayed neutron emission studies

3 juillet 2015

The study of β-delayed neutron emission plays a major role in different fields such as nuclear technology, nuclear astrophysics and nuclear structure. However the quality of the existing experimental data nowadays is not sufficient for the various technical and scientific applications and new (...)

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[in2p3-00625611] Asymmetric fission in 78Kr+40Ca reactions at 5.5 MeV/nucleon

3 juillet 2015

Decay modes of excited nuclei formed in the 78,82Kr+40Ca reactions at 5.5 AMeV are investigated by means of exclusive measurements using the INDRA detector at GANIL. Light‐charged particles in coincidence with fragments show that, in the mechanism of asymmetric fission, the light partner (with (...)

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[in2p3-00462634] A study of stopping power in nuclear reactions at intermediate energies

3 juillet 2015

We show a systematic experimental study based on INDRA data of the stopping power in central symmetric nuclear reactions. Total mass of the systems goes from 80 to 400 nucleons while the incident energy range is from 12 AMeV to 100 AMeV. The role of isospin diffusion at 32 and 45 MeV/nucleon (...)

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[in2p3-00462459] Influence Of The Neutron Richness On Binary Decays

3 juillet 2015

The influence of the neutron richness on binary decays is investigated in 78,82Kr+ 40Ca reactions at 5.5 MeV/A incident energy. Kinetic energy distributions and angular distributions of fragments with atomic number 6 ≤ Z ≤ 28 were measured using the 4π-INDRA array. Global features are compatible (...)

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[in2p3-00753651] Comparison of charged particle identification using pulse shape discrimination and ΔE−E methods between front and rear side injection in silicon detectors

3 juillet 2015

The response of silicon-silicon-CsI(Tl) telescopes, developed within the FAZIA collaboration, to fragments produced in nuclear reactions 84Kr+120-124Sn at 35 A MeV, has been used to study ion identification methods. Two techniques are considered for the identification of the nuclear products in (...)

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[in2p3-00451188] Description of current pulses induced by heavy ions in silicon detectors

3 juillet 2015

The polarization of the electron-hole pairs induced by 80 MeV View the MathML source ions in a silicon detector was considered and connected to the relative dielectric permittivity. The dissociation of pairs was supposed to take place with a constant probability in a time unit. The exact (...)

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[in2p3-00454242] Probing the nuclear equation of state in heavy-ion collisions at Fermi energy in isospin-sensitive exclusive experiments

3 juillet 2015

In order to guide the study of the form of the density dependence of the symmetry energy in the nuclear equation of state, robust observables are searched within the Stochastic Mean Field model coupled to a secondary decay treatment. We propose a few selected experimental approaches to show (...)

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[in2p3-00951103] Energy measurement and fragment identification using digital signals from partially depleted Si detectors

3 juillet 2015

A study of identification properties of a Si-Si DE-E telescope exploiting an underdepleted residual-energy detector has been performed. Five different bias voltages have been used, one corresponding to full depletion, the others associated with a depleted layer ranging from 90% to 60% of the (...)

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[in2p3-00868032] N and Z odd-even staggering in Kr + Sn collisions at Fermi energies

3 juillet 2015

The odd-even staggering of the yield of final reaction products has been studied as a function of proton (Z) and neutron (N) numbers for the collisions 84 Kr+112 Sn and 84 Kr+124 Sn at 35 MeV/nucleon, in a wide range of elements (up to Z ~ 20). The experimental data show that staggering effects (...)

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[in2p3-00782509] Effects of irradiation of energetic heavy ions on digital pulse shape analysis with silicon detectors

3 juillet 2015

The next generation of 4π detector arrays for heavy ion studies will largely use Pulse Shape Analysis to push the performance of silicon detectors with respect to ion identification. Energy resolution and pulse shape identification capabilities of silicon detectors under prolonged irradiation by (...)

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[in2p3-00656422] Particle identification using the (DELTA)E-E technique and pulse shape discrimination with the silicon detectors of the FAZIA project

3 juillet 2015

The response of silicon-silicon-CsI(Tl) and silicon-CsI(Tl) telescopes to fragments produced in nuclear interactions has been studied. The telescopes were developed within the FAZIA collaboration. The capabilities of two methods are compared: (a) the standard ΔE-E technique and (b) the digital (...)

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[in2p3-00675629] Characterization of quasi-projectiles produced in symmetric collisions studied with INDRA Comparison with models

3 juillet 2015

The characterization of hot quasi-projectiles produced in symmetric or quasi-symmetric reactions (Au + Au, Xe + Sn, Ni + Ni, Ar + KCl) at di erent incident energies are estimated by means of two di erent procedures. The advantages and disadvantages of each method are analyzed on the basis of (...)

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[in2p3-00875063] Isospin effects and symmetry energy studies with INDRA

3 juillet 2015

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 MeV/nucleon. (...)

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[in2p3-00691971] First measurements with the BEta deLayEd neutron detector (BELEN-20) at JYFLTRAP

3 juillet 2015

A prototype version of the BEta deLayEd Neutron detector, which is being developed for the FAIR/DESPEC experiment, has been used for the first time in an experiment at JYFL (Finland). This detector is based on 3He counters and its first run was primarily intended to commission the detector and (...)

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[in2p3-00858770] The european FAZIA initiative: a high-performance digital telescope array for heavy-ion studies

3 juillet 2015

The european Fazia collaboration aims at building a new modular array for charged product identification to be employed for heavy-ion studies. The elementary module of the array is a Silicon-Silicon-CsI telescope, optimized for ion identification also via pulse shape analysis. The achievement (...)

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[in2p3-01017226] Exploring reaction mechanisms and their competition in 58Ni+48Ca collisions at E = 25 AMeV

3 juillet 2015

Latest results concerning the study of central collisions in 58Ni+48Ca reactions at Elab(Ni)=25 AMeV are presented. The experimental data, collected with the CHIMERA 4π device, have been analyzed in order to investigate the competition among different reaction mechanisms for central collisions (...)

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[in2p3-00778551] Isospin transport in 84Kr + 112,124Sn collisions at Fermi energies

3 juillet 2015

Isotopically resolved fragments with Z =20 have been studied with high resolution telescopes in a test run for the FAZIA collaboration. The fragments were produced by the collision of a 84Kr beam at 35 MeV/nucleon with a n-rich (124Sn) and a n-poor (112Sn) target. The fragments, detected close (...)

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[in2p3-00462613] Exploring isospin effects on the level density parameter

3 juillet 2015

Ar+Ni reactions have been studied to fix some constraints on the isospin dependence of the level density. The coupling of INDRA and VAMOS apparatuses allows to obtain highly exclusive data . The preliminary results on the Ar+Ni fusion-evaporation cross sections suggest a dependence on the (...)

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[in2p3-01067158] Quasiprojectile and intermediate velocity isotopic ratios for light fragments emitted in the Ar 36 +Ni 58 and Ni 58 +Ni 58 reactions between 32A and 84A MeV

3 juillet 2015

Isotopic ratios for light fragments (Z≤4 ) emitted by the quasiprojectile (QP) and the mid-rapidity (MR) sources are investigated by the use of a slightly asymmetric system (Ar 36 +Ni 58 ) and a symmetric one (Ni 58 +Ni 58 ) for six energies between 32A and 84A MeV and three semiperipheral (...)

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[in2p3-00587476] Decay of excited nuclei produced in $^{78,82}$Kr + $^{40}$Ca reactions at 5.5 MeV/nucleon

3 juillet 2015

Decay modes of excited nuclei are investigated in $^78,82$Kr + $^40$Ca reactions at 5.5 MeV/nucleon. Charged products were measured by means of the $4\pi$ INDRA array. Kinetic-energy spectra and angular distributions of fragments with atomic number 3 $\le Z \le$ 28 indicate a high degree of (...)

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[in2p3-00494236] Strong enhancement of dynamical emission of heavy fragments in the neutron-rich 124Sn+64Ni reaction at 35A MeV

3 juillet 2015

A quantitative comparison is made between the absolute cross sections associated with statistical and dynamical emission of heavy fragments in the 124Sn+64Ni and 112Sn+58Ni collisions experimentally investigated at 35A MeV beam energy using the multidetector CHIMERA. The result shows that the (...)

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[in2p3-00986921] Competition between fusion-evaporation and multifragmentation in central collisions in 58Ni+48Ca at 25A MeV

3 juillet 2015

The experimental data concerning the Ni-58+Ca-48 reaction at E-lab(Ni)=25A MeV, collected by using the CHIMERA 4 pi device, have been analyzed in order to investigate the competition among different reaction mechanisms for central collisions in the Fermi energy domain. As a main criterion for (...)

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[hal-00821065] Constrained caloric curves and phase transition for hot nuclei

3 juillet 2015

Simulations based on experimental data obtained from multifragmenting quasi-fused nuclei produced in central $^129$Xe + $^nat$Sn collisions have been used to deduce event by event freeze-out properties in the thermal excitation energy range 4-12 AMeV [Nucl. Phys. A809 (2008) 111]. From these (...)

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[in2p3-00812697] Long lifetime components in the decay of excited super-heavy nuclei

3 juillet 2015

For nuclear reactions in which super-heavy nuclei can be formed, the essential difference between the fusion process followed by fission and non-equilibrium processes leading to fissionlike fragments is the reaction time. Quite probable non-equilibrium processes, characterized by very short (...)

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[in2p3-00855210] The Fazia initiative: more powerful detectors for a more detailed investigation on the origin and the decay of charged fragments

3 juillet 2015

The main results of the R&D program of the FAZIA collaboration are described. The objective was to improve particle identication capabilities from solid-state telescopes made of Silicon detectors and CsI(Tl) scintillators in view of a new large acceptance apparatus to be used for heavy-ion (...)

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[in2p3-00717128] Decay modes of the systems formed in the reactions 78Kr+40Ca and 86Kr+48Ca

3 juillet 2015

Preliminary outcome of ISODEC experiment, performed at INFNLNS with the CHIMERA array, are presented. Disintegration path dependence on the entrance-channel N/Z ratios (isospin asymmetries) for the reactions 78Kr+40Ca and 86Kr+48Ca at 10 A*MeV, which give origin to the intermediate systems (...)

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[in2p3-00717124] Nuclear symmetry energy in calcium-calcium collisions

3 juillet 2015

The density dependence of the symmetry energy is of great interest to many fields of nuclear physics and nuclear astro-physics. The E503 INDRA-VAMOS experiment performed at GANIL in 2007 is intended to provide further sub-saturation constraints using calcium-calcium collisions around the Fermi (...)

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[hal-00454499] New scalings in nuclear fragmentation

3 juillet 2015

Fragment partitions of fragmenting hot nuclei produced in central and semiperipheral collisions have been compared in the excitation energy region 4-10 MeV per nucleon where radial collective expansion takes place. It is shown that, for a given total excitation energy per nucleon, the amount of (...)

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[in2p3-00515835] Production of $\alpha$-particle condensate states in heavy-ion collisions

3 juillet 2015

The fragmentation of quasi-projectiles from the nuclear reaction $^40Ca$ + $^12C$ at 25 MeV/nucleon was used to produce excited states candidates to $\alpha$-particle condensation. The experiment was performed at LNS-Catania using the CHIMERA multidetector. Accepting the emission simultaneity (...)

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