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1. Experimental study of the $^{40,48}$Ca+ $^{40,48}$Ca reactions at 35 MeV/nucleon

Author

Fable, Q., Chbihi, A., Boisjoli, M., Frankland, J. D., Fèvre, A. Le, Neindre, N. Le, Marini, P., Verde, G., Ademard, G., Bardelli, L., Bhattacharya, C., Bhattacharya, S., Bonnet, E., Borderie, B., Bougault, R., Casini, G., Commara, M., Dayras, R., Ducret, J. E., Farget, F., Galichet, E., Génard, T., Gramegna, F., Gruyer, D., Henri, M., Kundu, S., Lemarié, J., Lopez, Olivier, Łukasik, J., Manduci, L., Moisan, J., Mukherjee, G., Napolitani, P., Olmi, A., Pârlog, M., Piantelli, S., Poggi, G., Rebillard-Soulié, A., Roy, R., Sorgunlu, B., Velardita, S., Vient, E., Vigilante, M., and Wieleczko, J. P.

Subjects
Nuclear Experiment, Physics - Atomic Physics
Abstract

In this article we investigate $^{40,48}$Ca+$^{40,48}$Ca peripheral and semi-peripheral reactions at 35 MeV/nucleon. Data were obtained using the unique coupling of the VAMOS high acceptance spectrometer and the INDRA charged particle multidetector.The spectrometer allowed high resolution measurement of charge, mass and velocity of the cold projectile-like fragment (PLF), while the INDRA detector recorded coincident charged particles with nearly $4\pi$ acceptance.The measured isotopic composition of the PLF identified in VAMOS and the average light charged particle (LCP) multiplicities are promising observables to study the isospin diffusion.The detection of the PLF in coincidence with LCP allows the reconstruction of the mass, charge and excitation energy of the associated initial quasi-projectile nuclei (QP), as well as the extraction of apparent temperatures.We investigate the suitability of the isoscaling method with the PLF and the experimental reconstructed QP.The extracted $\alpha$ and $\Delta$ isoscaling parameters present a dependence on the considered system combination that could justify their use as a surrogate for isospin asymmetry in isospin transport studies.The reconstruction of the QP allows to observe an evolution of the $\alpha/\Delta$ with the size of the QP, the latter being consistent with a strong surface contribution to the symmetry energy term in finite nuclei. This leads to the conclusion that the reconstruction of the primary source is mandatory for the study of the symmetry energy term based on the isoscaling method for such reactions.

Published
2022
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2. Correlations between emission timescale of fragments and isospin dynamics in $^{124}$Sn+$^{64}$Ni and $^{112}$Sn+$^{58}$Ni reactions at 35 AMeV

Author

De Filippo, E., Pagano, A., Russotto, P., Amorini, F., Anzalone, A., Auditore, L., Baran, V., Berceanu, I., Borderie, B., Bougault, R., Bruno, M., Cap, T., Cardella, G., Cavallaro, S., Chatterjee, M. B., Chbihi, A., Colonna, M., D'Agostino, M., Dayras, R., Di Toro, M., Frankland, J., Galichet, E., Gawlikowicz, W., Geraci, E., Grzeszczuk, A., Guazzoni, P., Kowalski, S., La Guidara, E., Lanzalone, G., Lanzanò, G., Neindre, N. Le, Lombardo, I., Maiolino, C., Papa, M., Piasecki, E., Pirrone, S., Planeta, R., Politi, G., Pop, A., Porto, F., Rivet, M. F., Rizzo, F., Rosato, E., Schmidt, K., Siwek-Wilczynska, K., Skwira-Chalot, I., Trifirò, A., Trimarchi, M., Verde, G., Vigilante, M., Wieleczko, J. P., Wilczynski, J., Zetta, L., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

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 $<$N/Z$>$ isospin asymmetry, stronger angular anisotropies and reduced odd-even staggering effects in neutron to proton ratio $<$N/Z$>$ distributions than those produced in sequential statistical emission. All these effects support the concept of isospin "migration", that is sensitive to the density gradient between participant and quasi-spectator nuclear matter, in the so called neck fragmentation mechanism. By comparing the data to a Stochastic Mean Field (SMF) simulation we show that this method gives valuable constraints on the symmetry energy term of nuclear equation of state at subsaturation densities. An indication emerges for a linear density dependence of the symmetry energy., Comment: 17 pages, 7 figures; submitted to Physical Rev. C

Published
2012
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3. Study of $^{124}$Sn+$^{136}$Xe fusion-evaporation: analysis of a rare-event experiment

Author

Avez, Benoît, Drouart, Antoine, Stodel, Ch., Simenel, Cédric, Alcantara, J., Adamczyk, M., Banka, P., Bonnet, E., Clément, E., Dayras, R., Force, C., Golabek, C., Gonciarz, A., Grevy, S., Hauschild, K., Jacquet, D., Korichi, A., Kozik, T., Lazko, P., Morjean, M., Popeko, A., Roger, T., Saint-Laurent, M. -G., Sosin, Z., Sulignano, B., Theisen, C., Wieloch, A., Yeremin, A., Yilmaz, B., and Zielinska, M.

Subjects
Nuclear Experiment
Abstract

Fusion-evaporation in the $^{124}$Sn+$^{136}$Xe system is studied using a high intensity xenon beam provided by the Ganil accelerator and the LISE3 wien filter for the selection of the products. Due to the mass symmetry of the entrance system, the rejection of the beam by the spectrometer was of the order of $5times10^8$. We have thus performed a detailed statistical analysis to estimate random events and to infer the fusion-evaporation cross sections. No signicant decay events were detected and upper limit cross sections of 172 pb, 87 pb and 235 pb were deduced for the synthesis of $^{257}$Rf, $^{258}$Rf and $^{259}$Rf, respectively., Comment: 7 pages, 4 figures

Published
2011

4. Decay of excited nuclei produced in $^{78,82}$Kr + $^{40}$Ca reactions at 5.5 MeV/nucleon

Author

Ademard, G., Wieleczko, J. P., Del Campo, J. Gomez, La Commara, M., Bonnet, E., Vigilante, M., Chbihi, A., Frankland, J. D., Rosato, E., Spadaccini, G., Kalandarov, Sh. A., Beck, C., Barlini, S., Borderie, B., Bougault, R., Dayras, R., De Angelis, G., De Sanctis, J., Kravchuk, V. L., Lautesse, P., Neindre, N. Le, Moisan, J., D'onofrio, A., Parlog, M., Pierroutsakou, D., Rivet, M. F., Romoli, M., Roy, R., Adamian, G. G., and Antonenko, N. V.

Subjects
Nuclear Experiment
Abstract

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 relaxation and are compatible with a fission-like phenomenon. Persistence of structure effects is evidenced from elemental cross-sections ($\sigma_{Z}$) as well as a strong odd-even-staggering (o-e-s) of the light-fragment yields. The magnitude of the staggering does not significantly depend on the neutron content of the emitting system. Fragment-particle coincidences suggest that the light partners in very asymmetric fission are emitted either cold or at excitation energies below the particle emission thresholds. The evaporation residue cross-section of the $^{78}$Kr + $^{40}$Ca reaction is slightly higher than the one measured in $^{82}$Kr + $^{40}$Ca reaction. The fission-like component is larger by $\sim$ 25% for the reaction having the lowest neutron-to-proton ratio. These experimental features are confronted to the predictions of theoretical models. The Hauser-Feshbach approach including the emission of fragments up to $Z$ = 14 in their ground states as well as excited states does not account for the main features of $\sigma_{Z}$. For both reactions, the transition-state formalism reasonably reproduces the $Z$-distribution of the fragments with charge 12 $\le Z \le$ 28. However, this model strongly overestimates the light-fragment cross-sections and does not explain the o-e-s of the yields for 6 $\le Z \le$ 10. The shape of the whole $Z$-distribution and the o-e-s of the light-fragment yields are satisfactorily reproduced within the dinuclear system framework which treats the competition between evaporation, fusion-fission and quasifission processes. The model suggests that heavy fragments come mainly from quasifission while light fragments are predominantly populated by fusion. An underestimation of the cross sections for 16 $\le Z \le$ 22 could signal a mechanism in addition to the capture process., Comment: 2 tables, 14 figures, accepted for publication in Physical Review C

Published
2011
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5. The prominent role of the heaviest fragment in multifragmentation and phase transition for hot nuclei

Author

Borderie, Bernard, Bonnet, E., Neindre, N. Le, Piantelli, S., Raduta, Ad. R., Rivet, M. F., Galichet, E., Gulminelli, F., Mercier, D., Tamain, B., Bougault, R., Parlog, M., Frankland, J. D., Chbihi, A., Wieleczko, J. P., Guinet, D., Lautesse, P., Gagnon-Moisan, F., Roy, R., Vigilante, M., Rosato, E., Dayras, R., and Lukasik, J.

Subjects
Nuclear Experiment
Abstract

The role played by the heaviest fragment in partitions of multifragmenting hot nuclei is emphasized. Its size/charge distribution (mean value, fluctuations and shape) gives information on properties of fragmenting nuclei and on the associated phase transition., Comment: 11 pages, Proceedings of IWND09, August 23-25, Shanghai (China)

Published
2010
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6. Isospin Diffusion in $^{58}$Ni-Induced Reactions at Intermediate Energies

Author

Galichet, E., Rivet, Marie-France, Borderie, B., Colonna, M., Bougault, R., Durand, D., Neindre, N. Le, Lopez, O., Manduci, L., Vient, E., Chbihi, A., Frankland, J. D., Wieleczko, J. P., Dayras, R., Volant, C., Guinet, D. C. R., Lautesse, P., Parlog, M., Rosato, E., and Vigilante, M.

Subjects
Nuclear Experiment
Abstract

Isospin diffusion is probed as a function of the dissipated energy by studying two systems $^{58}$Ni+$^{58}$Ni and $^{58}$Ni+$^{197}$Au, over the incident energy range 52-74\AM. Experimental data are compared with the results of a microscopic transport model with two different parameterizations of the symmetry energy term. A better overall agreement between data and simulations is obtained when using a symmetry term with a potential part linearly increasing with nuclear density. The isospin equilibration time at 52 \AM{} is estimated to 130$\pm$10 fm/$c$.

Published
2010
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7. Isospin diffusion in semi-peripheral $^{58}Ni$ + $^{197}Au$ collisions at intermediate energies (I): Experimental results

Author

Galichet, E., Rivet, M. F., Borderie, B., Colonna, M., Bougault, R., Chbihi, A., Dayras, R., Durand, D., Frankland, J. D., Guinet, D. C. R., Lautesse, P., Neindre, N. Le, Lopez, O., Manduci, L., Parlog, M., Rosato, E., Tamain, B., Vient, E., Volant, C., and Wieleczko, J. P.

Subjects
Nuclear Experiment
Abstract

Isospin diffusion in semi-peripheral collisions is probed as a function of the dissipated energy by studying two systems $^{58}Ni$ + $^{58}Ni$ and $^{58}Ni$ + $^{197}Au$, over the incident energy range 52-74\AM. A close examination of the multiplicities of light products in the forward part of phase space clearly shows an influence of the isospin of the target on the neutron richness of these products. A progressive isospin diffusion is observed when collisions become more central, in connection with the interaction time.

Published
2008
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8. Bimodal behavior of the heaviest fragment distribution in projectile fragmentation

Author

Bonnet, Eric, Mercier, Damien, Borderie, Bernard, Gulminelli, Francesca, Rivet, Marie-France, Tamain, Bernard, Bougault, R., Chbihi, A., Dayras, R., Frankland, J. D., Galichet, E., Gagnon-Moisan, F., Guinet, D., Lautesse, P., Lukasik, J., Neindre, N. Le, Pârlog, M., Rosato, E., Roy, R., Vigilante, M., Wieleczko, J. P., and Zwieglinski, B.

Subjects
Nuclear Experiment
Abstract

The charge distribution of the heaviest fragment detected in the decay of quasi-projectiles produced in intermediate energy heavy-ion collisions has been observed to be bimodal. This feature is expected as a generic signal of phase transition in non-extensive systems. In this paper we present new analyses of experimental data from Au on Au collisions at 60, 80 and 100 MeV/nucleon showing that bimodality is largely independent of the data selection procedure, and of entrance channel effects. An estimate of the latent heat of the transition is extracted., Comment: 5 pages, submitted to PRL

Published
2008
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9. Fragment properties of fragmenting heavy nuclei produced in central and semi-peripheral collisions

Author

Bonnet, Eric, Borderie, Bernard, Neindre, Nicolas Le, Rivet, Marie-France, Bougault, R., Chbihi, A., Dayras, R., Frankland, J. D., Galichet, E., Gagnon-Moisan, F., Guinet, D., Lautesse, P., Lukasik, J., Mercier, D., Pârlog, M., Rosato, E., Roy, R., Sfienti, C., Vigilante, M., Wieleczko, J. P., and Zwieglinski, B.

Subjects
Nuclear Experiment
Abstract

Fragment properties of hot fragmenting sources of similar sizes produced in central and semi-peripheral collisions are compared in the excitation energy range 5-10 AMeV. For semi-peripheral collisions a method for selecting compact quasi-projectiles sources in velocity space similar to those of fused systems (central collisions) is proposed. The two major results are related to collective energy. The weak radial collective energy observed for quasi-projectile sources is shown to originate from thermal pressure only. The larger fragment multiplicity observed for fused systems and their more symmetric fragmentation are related to the extra radial collective energy due to expansion following a compression phase during central collisions. A first attempt to locate where the different sources break in the phase diagram is proposed., Comment: 23 pages submitted to NPA

Published
2008
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10. Multi-particle correlation function to study short-lived nuclei

Author

Grenier, F., Chbihi, A., Roy, R., Verde, G., Thériault, D., Frankland, J. D., Wieleczko, J. P., Borderie, B., Bougault, R., Dayras, R., Galichet, E., Guinet, D., Lautesse, P., Neindre, N. Le, Lopez, O., Moisan, J., Nalpas, L., Napolitani, P., Parlog, M., Rivet, M. F., Rosato, E., Tamain, B., Vient, E., and Vigilante, M.

Subjects
Nuclear Experiment
Abstract

Unstable 10C nuclei are produced as quasi-projectiles in 12C+24Mg collisions at E/A = 53 and 95 MeV. The decay of their short-lived states is studied with the INDRA multidetector array via multi-particle correlation functions. The obtained results show that heavy-ion collisions can be used as a tool to access spectroscopic information of unbound states in exotic nuclei, such as their energies and the relative importance of different sequential decay widths., Comment: 8 figures, accepted for publication in Nuclear Physics A

Published
2008
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11. Influence of Neutron Enrichment on Disintegration Modes of Compound Nuclei

Author

Bonnet, E., Wieleczko, J. P., Chbihi, A., Frankland, J. D., Moisan, J., Rejmund, F., del Campo, J. Gomez, Galindo-Uribarri, A., Shapira, D., La Commara, M., Pierroutsakou, B. Martin. D., Romoli, M., Rosato, E., Vigilante, G. Spadaccini. M., Barlini, S., Bougault, R., Neindre, N. Le, Parlog, M., Tamain, B., Beck, C., Borderie, B., Rivet, M. F., Dayras, R., Nalpas, L., De Angelis, G., Glodariou, T., Kravchuk, V., Lautesse, Ph., Onofrio, A. D., and Roy, R.

Subjects
Nuclear Experiment
Abstract

Cross sections, kinetic energy and angular distributions of fragments with charge 6$\le$Z$\le$28 emitted in 78,82Kr+40C at 5.5 MeV/A reactions were measured at the GANIL facility using the INDRA apparatus. This experiment aims to investigate the influence of the neutron enrichment on the decay mechanism of excited nuclei. Data are discussed in comparison with predictions of transition state and Hauser-Feshbach models., Comment: 8 pages, 1 figure, paper presented at the First Workshop on "State of the Art in Nuclear Cluster Physics" 13-16 May, 2008, at Strasbourg, France (SOTANCP2008) and accepted for publication at International Journal of Modern Physics E (Special Issue), Proceedings of SOTANCP2008 (to be published)

Published
2008
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12. Source shape determination with directional fragment-fragment velocity correlations

Author

Fevre, A. Le, Schwarz, C., Auger, G., Begemann-Blaich, M. L., Bellaize, N., Bittiger, R., Bocage, F., Borderie, B., Bougault, R., Bouriquet, B., Charvet, J. L., Chbihi, A., Dayras, R., Durand, D., Frankland, J. D., Galichet, E., Gourio, D., Guinet, D., Hudan, S., Lautesse, P., Lavaud, F., Legrain, R., Lopez, O., Lukasik, J., Lynen, U., Mueller, W. F. J., Nalpas, L., Orth, H., Plagnol, E., Rosato, E., Saija, A., Sfienti, C., Tamain, B., Trautmann, W., Trzcinski, A., Turzo, K., Vient, E., Vigilante, M., Volant, C., and Zwieglinski, B.

Subjects
Nuclear Experiment
Abstract

Correlation functions, constructed from directional projections of the relative velocities of fragments, are used to determine the shape of the breakup volume in coordinate space. For central collisions of 129Xe + natSn at 50 MeV per nucleon incident energy, measured with the 4pi multi-detector INDRA at GSI, a prolate shape aligned along the beam direction with an axis ratio of 1:0.7 is deduced. The sensitivity of the method is discussed in comparison with conventional fragment-fragment velocity correlations., Comment: 12 pages, 5 figures, subm. to Phys. Lett. B

Published
2007
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13. Yield scaling, size hierarchy and fluctuations of observables in fragmentation of excited heavy nuclei

Author

Neindre, N. Le, Bonnet, E., Wieleczko, J. P., Borderie, B., Gulminelli, F., Rivet, M. F., Bougault, R., Chbihi, A., Dayras, R., Frankland, J. D., Galichet, E., Guinet, D., Lautesse, P., Lopez, O., Lukasik, J., Mercier, D., Moisan, J., Parlog, M., Rosato, E., Roy, R., Schwarz, C., Sfienti, C., Tamain, B., Trautmann, W., Trzcinski, A., Turzo, K., Vient, E., Vigilante, M., and Zwieglinski, B.

Subjects
Nuclear Experiment
Abstract

Multifragmentation properties measured with INDRA are studied for single sources produced in Xe+Sn reactions in the incident energy range 32-50 A MeV and quasiprojectiles from Au+Au collisions at 80 A MeV. A comparison for both types of sources is presented concerning Fisher scaling, Zipf law, fragment size and fluctuation observables. A Fisher scaling is observed for all the data. The pseudo-critical energies extracted from the Fisher scaling are consistent between Xe+Sn central collisions and Au quasi-projectiles. In the latter case it also corresponds to the energy region at which fluctuations are maximal. The critical energies deduced from the Zipf analysis are higher than those from the Fisher analysis., Comment: 30 pages, accepted for publication in Nuclear Physics A, references corrected

Published
2007
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14. Decay modes of $^{10}$C nuclei unbound state

Author

Grenier, F., Chbihi, A., Roy, R., Verde, G., Thériault, D., Frankland, J. D., Wieleczko, J. P., Borderie, B., Bougault, R., Dayras, R., Galichet, E., Guinet, D., Lautesse, P., Neindre, N. Le, Lopez, O., Moisan, J., Nalpas, L., Pârlog, M., Rivet, M. F., Rosato, E., Tamain, B., Vient, E., and Vigilante, M.

Subjects
Nuclear Experiment
Abstract

Unbound states of $^{10}$C nuclei produced as quasi-projectiles in $^{12}$C+$^{24}$Mg collisions at E/A = 53 and 95 MeV are studied with the Indra detector array. Multi-particle correlation function analyses provide experimental evidence of sequential de-excitation mechanisms through the production of intermediate $^{9}$B, $^{6}$Be and $^{8}$Be unbound nuclei. The relative contributions of different decay sequences to the total decay width of the explored states is estimated semi-quantitatively. The obtained results show that heavy-ion collisions can be used as a tool to access spectroscopic information about exotic nuclei., Comment: 12 pages, 3 figures, submitted to Physics Letters B

Published
2007

15. Transition from participant to spectator fragmentation in Au+Au reaction between 60 AMeV and 150 AMeV

Author

Zbiri, K., LeFèvre, A., Aichelin, J., Łukasik, J., Reisdorf, W., Gulminelli, F., Lynen, U., Müller, W. F. J., Orth, H., Schwarz, C., Sfienti, C., Trautmann, W., Turzó, K., Zwiegliński, B., Auger, G., Charvet, J. L., Chbihi, A., Dayras, R., Durand, D., Frankland, J. D., Legrain, R., Neindre, N. Le, Lopez, O., Nalpas, L., Parlog, M., Rivet, M. F., Rosato, E., Vient, E., Vigilante, M., Volant, C., and Wieleczko, J. P.

Subjects
Nuclear Theory
Abstract

Using the quantum molecular dynamics approach, we analyze the results of the recent INDRA Au+Au experiments at GSI in the energy range between 60 AMeV and 150 AMeV. It turns out that in this energy region the transition toward a participant-spectator scenario takes place. The large Au+Au system displays in the simulations as in the experiment simultaneously dynamical and statistical behavior which we analyze in detail: The composition of fragments close to midrapidity follows statistical laws and the system shows bi-modality, i.e. a sudden transition between different fragmentation pattern as a function of the centrality as expected for a phase transition. The fragment spectra at small and large rapidities, on the other hand, are determined by dynamics and the system as a whole does not come to equilibrium, an observation which is confirmed by FOPI experiments for the same system., Comment: published version

Published
2006
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16. Estimate of average freeze-out volume in multifragmentation events

Author

Piantelli, S., Neindre, N. Le, Bonnet, E., Borderie, B., Lanzalone, G., Parlog, M., Rivet, M. F., Bougault, R., Chbihi, A., Dayras, R., Durand, D., Frankland, J. D., Galichet, E., Guinet, D., Lautesse, P., Lopez, O., Rosato, E., Tamain, B., Vient, E., Vigilante, M., Volant, C., Wieleczko, J. P., and Collaboration, the Indra

Subjects
Nuclear Experiment
Abstract

An estimate of the average freeze-out volume for multifragmentation events is presented. Values of volumes are obtained by means of a simulation using the experimental charged product partitions measured by the 4pi multidetector INDRA for 129Xe central collisions on Sn at 32 AMeV incident energy. The input parameters of the simulation are tuned by means of the comparison between the experimental and simulated velocity (or energy) spectra of particles and fragments., Comment: To be published in Phys. Lett. B 12 pages, 5 figures

Published
2005
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17. Correlation functions and emission time sequence of light charged particles from projectile-like fragment source in E/A = 44 and 77 MeV 40Ar + 27Al collisions

Author

Ghetti, R., Helgesson, J., Lanzano', G., De Filippo, E., Geraci, M., Aiello, S., Cavallaro, S., Pagano, A., Politi, G., Charvet, J. L., Dayras, R., Pollacco, E., Volant, C., Beck, C., Mahboub, D., and Nouicer, R.

Subjects
Nuclear Experiment
Abstract

Two-particle correlation functions, involving protons, deuterons, tritons, and alpha-particles, have been measured at very forward angles (0.7 deg < theta_lab < 7 deg), in order to study projectile-like fragment (PLF) emission in E/A = 44 and 77 MeV 40Ar + 27Al collisions. Peaks, originating from resonance decays, are larger at E/A = 44 than at 77 MeV. This reflects the larger relative importance of independently emitted light particles, as compared to two-particle decay from unstable fragments, at the higher beam energy. The time sequence of the light charged particles, emitted from the PLF, has been deduced from particle-velocity-gated correlation functions (discarding the contribution from resonance decays). Alpha-particles are found to have an average emission time shorter than protons but longer than tritons and deuterons., Comment: 18 pages, 5 figures, submitted to Nuclear Physics A

Published
2004
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18. Directed and elliptic flow in Au + Au at intermediate energies

Author

Lukasik, J., Auger, G., Begemann-Blaich, M. L., Bellaize, N., Bittiger, R., Bocage, F., Borderie, B., Bougault, R., Bouriquet, B., Charvet, J. L., Chbihi, A., Dayras, R., Durand, D., Frankland, J. D., Galichet, E., Gourio, D., Guinet, D., Hudan, S., Lautesse, P., Lavaud, F., Fevre, A. Le, Legrain, R., Lopez, O., Lynen, U., Mueller, W. F. J., Nalpas, L., Orth, H., Plagnol, E., Rosato, E., Saija, A., Schwarz, C., Sfienti, C., Tamain, B., Trautmann, W., Trzcinski, A., Turzo, K., Vient, E., Vigilante, M., Volant, C., and Zwieglinski, B.

Subjects
Nuclear Experiment
Abstract

Directed and elliptic flow for the Au + Au system at incident energies between 40 and 150 MeV per nucleon has been measured using the INDRA 4 pi multi-detector. For semi-central collisions, the elliptic flow of Z <= 2 particles switches from in-plane to out-of-plane enhancement at around 100 MeV per nucleon, in good agreement with the result reported by the FOPI Collaboration. The directed flow changes sign at a bombarding energy between 50 and 60 MeV per nucleon and remains negative at lower energies. The conditions for the appearance and possible origins of negative flow are discussed., Comment: 12 pages, 6 eps figures, elsart, submitted to Phys. Lett. B

Published
2004
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19. Isotopic Scaling and the Symmetry Energy in Spectator Fragmentation

Author

INDRA, The, Collaborations, ALADIN, Fèvre, A. Le, Auger, G., Begemann-Blaich, M. L., Bellaize, N., Bittiger, R., Bocage, F., Borderie, B., Bougault, R., Bouriquet, B., Charvet, J. L., Chbihi, A., Dayras, R., Durand, D., Frankland, J. D., Galichet, E., Gourio, D., Guinet, D., Hudan, S., Immé, G., Lautesse, P., Lavaud, F., Legrain, R., Lopez, O., Łukasik, J., Lynen, U., Müller, W. F. J., Nalpas, L., Orth, H., Plagnol, E., Raciti, G., Rosato, E., Saija, A., Schwarz, C., Seidel, W., Sfienti, C., Tamain, B., Trautmann, W., Trzciński, A., Turzó, K., Vient, E., Vigilante, M., Volant, C., Zwiegliński, B., and Botvina, A. S.

Subjects
Nuclear Experiment
Abstract

Isotopic effects in the fragmentation of excited target residues following collisions of $^{12}$C on $^{112,124}$Sn at incident energies of 300 and 600 MeV per nucleon were studied with the INDRA 4$\pi$ detector. The measured yield ratios for light particles and fragments with atomic number $Z \leq$ 5 obey the exponential law of isotopic scaling. The deduced scaling parameters decrease strongly with increasing centrality to values smaller than 50% of those obtained for the peripheral event groups. Symmetry term coefficients, deduced from these data within the statistical description of isotopic scaling, are near $\gamma =$ 25 MeV for peripheral and $\gamma <$ 15 MeV for central collisions., Comment: 4 pages, 4 figures

Published
2004
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20. Model-independent tracking of criticality signals in nuclear multifragmentation data

Author

Frankland, J. D., Chbihi, A., Mignon, A., Begemann-Blaich, M. L., Bittiger, R., Borderie, B., Bougault, R., Charvet, J. -L., Cussol, D., Dayras, R., Durand, D., Escano-Rodriguez, C., Galichet, E., Guinet, D., Lautesse, P., Fevre, A. Le, Legrain, R., Neindre, N. Le, Lopez, O., Lukasik, J., Lynen, U., Manduci, L., Marie, J., Muller, W. F. J., Orth, H., Parlog, M., Pichon, M., Rivet, M. F., Rosato, E., Roy, R., Saija, A., Schwarz, C., Sfienti, C., Tamain, B., Trautmann, W., Trzcinski, A., Turzo, K., Van Lauwe, A., Vigilante, M., Volant, C., Wieleczko, J. P., Zwieglinski, B., Vient, E., and Nalpas, L.

Subjects
Nuclear Experiment
Abstract

We look for signals of criticality in multifragment production in heavy-ion collisions using model-independent universal fluctuations theory. The phenomenon is studied as a function of system size, bombarding energy, and impact parameter in a wide range of INDRA data. For very central collisions (b/b_max

Published
2004
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21. Elements Discrimination in the Study of Super-Heavy Elements using an Ionization Chamber

Author

FULIS Collaboration, Wieloch, A., Sosin, Z., Peter, J., Lojek, K., Alamanos, N., Amar, N., Anne, R., Angelique, J. C., Auger, G., Dayras, R., Drouart, A., Fontbonne, J. M., Gillibert, A., Grevy, S., Hanappe, F., Hannachi, F., Hue, R., Khouaja, A., Legou, T., Lopez-Martens, A., Lienard, E., Manduci, L., Santos, F. de Oliveira, Politi, G., Saint-Laurent, M. G., Stodel, C., Stuttge, L., Tillier, J., de Tourreil, R., Villari, A. C. C., and Wieleczko, J. P.

Subjects
Nuclear Experiment
Abstract

Dedicated ionization chamber was built and installed to measure the energy loss of very heavy nuclei at 2.7 MeV/u produced in fusion reactions in inverse kinematics (beam of 208Pb). After going through the ionization chamber, products of reactions on 12C, 18O targets are implanted in a Si detector. Their identification through their alpha decay chain is ambiguous when their half-life is short. After calibration with Pb and Th nuclei, the ionization chamber signal allowed us to resolve these ambiguities. In the search for rare super-heavy nuclei produced in fusion reactions in inverse or symmetric kinematics, such a chamber will provide direct information on the nuclear charge of each implanted nucleus., Comment: submitted to NIMA, 10 pages+4 figures, Latex, uses elsart.cls and grahpicx

Published
2003
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22. Dynamical effects in multifragmentation at intermediate energies

Author

Colin, J., Cussol, D., Normand, J., Bellaize, N., Borderie, B., Bougault, R., Bouriquet, B., Buta, A. M., Charvet, J. L., Chbihi, A., Dayras, R., Durand, D., Frankland, J. D., Galichet, E., Guinet, D., Guiot, B., Hudan, S., Lautesse, P., Lavaud, F., Neindre, N. Le, Lopez, O., Manduci, L., Marie, J., Nalpas, L., Parlog, M., Pawlowski, P., Plagnol, E., Rivet, M. F., Rosato, E., Roy, R., Steckmeyer, J. C., Tamain, B., Van Lauwe, A., Vient, E., Vigilante, M., Volant, C., and Wieleczko, J. P.

Subjects
Nuclear Experiment
Abstract

The fragmentation of the quasi-projectile is studied with the INDRA multidetector for different colliding systems and incident energies in the Fermi energy range. Different experimental observations show that a large part of the fragmentation is not compatible with the statistical fragmentation of a fully equilibrated nucleus. The study of internal correlations is a powerful tool, especially to evidence entrance channel effects. These effects have to be included in the theoretical descriptions of nuclear multifragmentation., Comment: 13 pages, 26 figures, submitted to Physical Review C

Published
2003
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23. Fragmentation in Peripheral Heavy-Ion Collisions: from Neck Emission to Spectator Decays

Author

Lukasik, J., Auger, G., Begemann-Blaich, M. L., Bellaize, N., Bittiger, R., Bocage, F., Borderie, B., Bougault, R., Bouriquet, B., Charvet, J. L., Chbihi, A., Dayras, R., Durand, D., Frankland, J. D., Galichet, E., Gourio, D., Guinet, D., Hudan, S., Hurst, B., Lautesse, P., Lavaud, F., Fevre, A. Le, Legrain, R., Lopez, O., Lynen, U., Mueller, W. F. J., Nalpas, L., Orth, H., Plagnol, E., Rosato, E., Saija, A., Schwarz, C., Sfienti, C., Steckmeyer, J. C., Tamain, B., Trautmann, W., Trzcinski, A., Turzo, K., Vient, E., Vigilante, M., Volant, C., Zwieglinski, B., and Botvina, A. S.

Subjects
Nuclear Experiment
Abstract

Invariant cross sections of intermediate mass fragments in peripheral collisions of Au on Au at incident energies between 40 and 150 AMeV have been measured with the 4-pi multi-detector INDRA. The maximum of the fragment production is located near mid-rapidity at the lower energies and moves gradually towards the projectile and target rapidities as the energy is increased. Schematic calculations within an extended Goldhaber model suggest that the observed cross-section distributions and their evolution with energy are predominantly the result of the clustering requirement for the emerging fragments and of their Coulomb repulsion from the projectile and target residues. The quantitative comparison with transverse energy spectra and fragment charge distributions emphasizes the role of hard scattered nucleons in the fragmentation process., Comment: 5 pages, 5 eps figures, RevTeX4, submitted to Phys. Lett. B

Published
2003
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24. New approach of fragment charge correlations in 129Xe+(nat)Sn central collisions

Author

Charvet, J. L., Dayras, R., Durand, D., Lopez, O., Cussol, D., Dore, D., Nalpas, L., Van Lauwe, A., and Volant, C.

Subjects
Nuclear Experiment
Abstract

A previous analysis of the charge (Z) correlations in the $\Delta Z-$ plane for Xe+Sn central collisions at 32 MeV/u has shown an enhancement in the production of equally sized fragments (low $\Delta Z$) which was interpreted as an evidence for spinodal decomposition. However the signal is weak and rises the question of the estimation of the uncorrelated yield. After a critical analysis of its robustness, we propose in this paper a new technique to build the uncorrelated yield in the charge correlation function. The application of this method to Xe+Sn central collision data at 32, 39, 45 and 50 MeV/u does not show any particular enhancement of the correlation function in any $\Delta Z$ bin., Comment: 23 pages, 9 figures, revised version with an added figure and minor changes. To appear in Nuclear Physics A

Published
2002
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25. Transverse Velocity Scaling in Au+Au Fragmentation

Author

Lukasik, J., Hudan, S., Lavaud, F., Turzo, K., Auger, G., Bacri, Ch. O., Begemann-Blaich, M. L., Bellaize, N., Bittiger, R., Bocage, F., Borderie, B., Buchet, P., Bougault, R., Bouriquet, B., Charvet, J. L., Chbihi, A., Dayras, R., Durand, D., Dore, D., Frankland, J. D., Galichet, E., Gourio, D., Guinet, D., Hurst, B., Leduc, C., Lautesse, P., Laville, J. L., Fevre, A. Le, Legrain, R., Lynen, U., Mueller, W. F. J., Lopez, O., Nalpas, L., Orth, H., Plagnol, E., Rosato, E., Saija, A., Tabacaru, G., Sfienti, C., Schwarz, C., Steckmeyer, J. C., Tamain, B., Trautmann, W., Vient, E., Trzcinski, A., Vigilante, M., Volant, C., Zwieglinski, B., and Botvina, A. S.

Subjects
Nuclear Experiment
Abstract

Invariant transverse-velocity spectra of intermediate-mass fragments were measured with the 4-pi multi-detector system INDRA for collisions of Au on Au at incident energies between 40 and 150 MeV per nucleon. Their scaling properties as a function of incident energy and atomic number Z are used to distinguish and characterize the emissions in (i) peripheral collisions at the projectile and target rapidities, and in (ii) central and (iii) peripheral collisions near mid-rapidity. The importance of dynamical effects is evident in all three cases and their origin is discussed., Comment: 4 pages, 3 eps figures, RevTeX4, submitted to Phys. Rev

Published
2002
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26. Effect of the intermediate velocity emissions on the quasi-projectile properties for the Ar+Ni system at 95 A.MeV

Author

Dore, D., Buchet, Ph., Charvet, J. L., Dayras, R., Nalpas, L., Cussol, D., Lefort, T., Legrain, R., Volant, C., Auger, G., Bacri, Ch. O., Bellaize, N., Bocage, F., Bougault, R., Bouriquet, B., Brou, R., Chbihi, A., Colin, J., Demeyer, A., Durand, D., Frankland, J. D., Galichet, E., Genouin-Duhamel, E., Gerlic, E., Guinet, D., Hudan, S., Lautesse, P., Lavaud, F., Laville, J. L., Lecolley, J. F., Leduc, C., Neindre, N. Le, Lopez, O., Louvel, M., Maskay, A. M., Normand, J., Parlog, M., Pawlowski, P., Plagnol, E., Rivet, M. F., Rosato, E., Saint-Laurent, F., Steckmeyer, J. C., Stern, M., Tabacaru, G., Tamain, B., Tassan-Got, L., Tirel, O., Vient, E., and Wieleczko, J. P.

Subjects
Nuclear Experiment
Abstract

The quasi-projectile (QP) properties are investigated in the Ar+Ni collisions at 95 A.MeV taking into account the intermediate velocity emission. Indeed, in this reaction, between 52 and 95 A.MeV bombarding energies, the number of particles emitted in the intermediate velocity region is related to the overlap volume between projectile and target. Mean transverse energies of these particles are found particularly high. In this context, the mass of the QP decreases linearly with the impact parameter from peripheral to central collisions whereas its excitation energy increases up to 8 A.MeV. These results are compared to previous analyses assuming a pure binary scenario.

Published
2000
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27. Study of the Fusion-Fission Process in the $^{35}Cl+^{24}Mg$ Reaction

Author

Beck, C., Cavallaro, Sl., and Dayras, R.

Subjects
Nuclear Experiment
Abstract

Fusion-fission and fully energy-damped binary processes of the $^{35}$Cl+$^{24}$Mg reaction were investigated using particle-particle coincidence techniques at a $^{35}$Cl bombarding energy of E$_{lab}$ $\approx$ 8 MeV/nucleon. Inclusive data were also taken in order to determine the partial wave distribution of the fusion process. The fragment-fragment correlation data show that the majority of events arises from a binary-decay process with a relatively large multiplicity of secondary light-charged particles emitted by the two primary excited fragments in the exit channel. No evidence is observed for ternary-breakup processes, as expected from the systematics recently established for incident energies below 15 MeV/nucleon and for a large number of reactions. The binary-process results are compared with predictions of statistical-model calculations. The calculations were performed using the Extended Hauser-Feshbach method, based on the available phase space at the scission point of the compound nucleus. This new method uses temperature-dependent level densities and its predictions are in good agreement with the presented experimental data, thus consistent with the fusion-fission origin of the binary fully-damped yields., Comment: 30 pages standard REVTeX file, 10 eps Figures; to be published at the European Physical Journal A - Hadrons and Nuclei

Published
1998
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28. Fusion and Binary-Decay Mechanisms in the $^{35}$Cl+$^{24}$Mg System at E/A $\approx$ 8 MeV/Nucleon

Author

Cavallaro, Sl., Dayras, ; R., Beck, ; C., and Sanders, ; S. J.

Subjects
Nuclear Experiment
Abstract

Compound-nucleus fusion and binary-reaction mechanisms have been investigated for the $^{35}$Cl+$^{24}$Mg system at an incident beam energy of E$_{Lab}$= 282 MeV. Charge distributions, inclusive energy spectra, and angular distributions have been obtained for the evaporation residues and the binary fragments. Angle-integrated cross sections have been determined for evaporation residues from both the complete and incomplete fusion mechanisms. Energy spectra for binary fragment channels near to the entrance-channel mass partition are characterized by an inelastic contribution that is in addition to a fully energy damped component. The fully damped component which is observed in all the binary mass channels can be associated with decay times that are comparable to, or longer than the rotation period. The observed mass-dependent cross sections for the fully damped component are well reproduced by the fission transition-state model, suggesting a fusion followed by fission origin. The present data cannot, however, rule out the possibility that a long-lived orbiting mechanism accounts for part or all of this yield., Comment: 41 pages standard REVTeX file, 14 Figures available upon request --

Published
1997
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29. Statistical Binary Decay of $^{35}$Cl + $^{24}$Mg at 8 MeV/nucleon

Author

Nouicer, R., Beck, C., Mahboub, D., Matsuse, T., Djerroud, B., Freeman, R. M., Hachem, A., Cavallaro, Sl., De Filippo, E., Lanzano, G., Pagano, A., Sperduto, M. L., Dayras, R., Berthoumieux, E., Legrain, R., and Pollacco, E.

Subjects
Nuclear Experiment
Abstract

The properties of the two-body channels in the $^{35}$Cl + $^{24}$Mg reaction at a bombarding energy of 275 MeV have been investigated by using fragment-fragment coincident techniques. The exclusive data show that the majority of events arises from a binary-decay process. The rather large number of secondary light charged-particles emitted from the two excited exit fragments are cnsistent with the expectations of the Extended Hauser-Feshbach Method. No evidence for the occurence of ternary break-up events is observed., Comment: 8 pages, 3 Figures available upon request To be published at Z. Phys. A

Published
1996
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30. $^{35}$Cl+$^{12}$C Asymmetrical fission excitation functions

Author

Beck, C., Mahboub, D., Nouicer, R., Matsuse, T., Djerroud, B., Freeman, R. M., Haas, F., Hachem, A., Morsad, A., Youlal, M., Sanders, S. J., Dayras, R., Berthoumieux, E., Legrain, R., Pollacco, E., Cavallaro, Sl, De Filippo, E., Lanzano, G., Pagano, A., and Sperduto, M. L.

Subjects
Nuclear Theory
Abstract

The fully energy-damped yields from the $^{35}$Cl+$^{12}$C reaction have been systematically investigated using particle-particle coincidence techniques at a $^{35}$Cl bombarding energy of $\sim$ 8 MeV/nucleon. The fragment-fragment correlation data show that the majority of events arises from a binary-decay process with rather large numbers of secondary light-charged particles emitted from the two excited exit fragments. No evidence is observed for ternary break-up events. The binary-process results of the present measurement, along with those of earlier, inclusive experimental data obtained at several lower bombarding energies are compared with predictions of two different kinds of statistical model calculations. These calculations are performed using the transition-state formalism and the Extended Hauser-Feshbach method and are based on the available phase space at the saddle point and scission point of the compound nucleus, respectively. The methods give comparable predictions and are both in good agreement with the experimental results thus confirming the fusion-fission origin of the fully-damped yields. The similarity of the predictions for the two models supports the claim that the scission point configuration is very close to that of the saddle point for the light $^{47}$V mass-asymmetry-dependent fission barriers needed in the transition-state calculation., Comment: 20 pages, revtex, figures available upon request, to appear in Phys. Rev. C

Published
1996
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31. Asymmetric Fission in the 78Kr+40Ca reactions at 5.5 MeV/nucleon

Author

Roy R., Pierroutsakou D., Romoli M., D’Onofrio A., Parlog M., Neindre N. Le, Lautesse P., Kravchuk V.L., Sanctis J. De, De Angelis G., Bougault R., Dayras R., Barlini S., Borderie B., Beck C., Spadaccini G., Rosato E., Vigilante M., Commara M. La, del Campo J. Gomez, Chbihi A., Frankland J.D., Bonnet E., Schmitt C., Mazurek K., Wieleczko J.P., and Ademard G.

Subjects
Physics, QC1-999
Abstract

The cross section, kinetic energy distribution and angular distribution of fragments with atomic number 3 ≤ Z ≤ 28 emitted in the reaction 78Kr + 40Ca at the bombarding energy of 5.5 MeV/nucleon and coincidence between light charged particles and fragments were measured by means of the 4π-INDRA array to study the decay mechanism of medium mass excited nucleus. Global features indicate a high degree of relaxation and are compatible with a binary fission from compound nucleus. The mean value of the kinetic energy distributions of fragments indicates dominance of Coulomb interaction, while the width of the distribution signals large fluctuations. Inclusive cross-section distributions of fragments with charge 3 ≤ Z ≤ 28 are bell-shaped and a strong even-odd-staggering (o-es) is observed for 3 ≤ Z ≤ 12. Coincidence measurements suggest that the light partners in very asymmetric fission are emitted at excitation energies below the particle emission thresholds. Data were confronted to the predictions of statistical model describing the decay of compound nuclei by emission of light particles and fragments. Calculations assuming spherical fission fragments and finite-range liquid drop fission barriers are not able to explain the experimental features. Attempts have been made to improve the agreement with experimental data. The analysis indicates the strong influence of the shape parameterization of the potential energy surface in describing the fission process of intermediate mass compound nuclei.

Published
2012
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32. Decay of excited nuclei produced in the 78,82Kr+40Ca reactions at 5.5 MeV/nucleon

Author

Le Neindre N., Lautesse P., Kravchuk V.L., De Sanctis J., De Angelis G., Dayras R., Bougault R., Barlini S., Borderie B., Beck C., Kalandarov Sh.A., Rosato E., Spadaccini G., Frankland J.D., Chbihi A., Vigilante M., Bonnet E., LaCommara M., del Campo J. Gomez, Wieleczko J.P., Ademard G., Moisan J., D’Onofrio A., Parlog M., Pierroutsakou D., Romoli M., Roy R., Adamian G.G., and Antonenko N.V.

Subjects
Physics, QC1-999
Abstract

Decay modes of excited nuclei are studied in 78,82Kr + 40Ca reactions at 5.5 MeV/nucleon by means of light-charged particles measured in coincidence with intermediate mass fragments and fission-like fragments. Inclusive cross-section distributions of fragments with charge 3 ≤ Z ≤ 28 are bell-shaped and a strong oddeven-staggering (o-e-s) is observed for 3 ≤ Z ≤ 12. Coincidence measurements suggest that the light partners in very asymmetric fission are emitted at excitation energies below the particle emission thresholds. Data were confronted to the predictions of statistical models describing the decay of compound nuclei by emission of light particles and fragments. Comparison with models suggests that the o-e-s of the light-fragment yields is mainly due to the successive steps of compound nucleus disintegration.

Published
2011
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33. Influence Of The Neutron Richness On Binary Decays

Author

Roy R., Shapira D., Romoli M., Rejmund F., Rivet M.F., Parlog M., Pierroutsakou D., Lautesse P., Le Neindre N., De Angelis G., Galindo-Uribarri A., Bougault R., Dayras R., Beck C., Borderie B., Spadaccini G., Gomez del Campo J., D’Onofrio A., Rosato E., Vigilante M., La Commara M., Frankland J.D., Bonnet E., Chbihi A., Ademard G., and Wieleczko J.P.

Subjects
Physics, QC1-999
Abstract

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 with an emission from a long-lived system. The yields around the symmetric splitting are about 30The persistence of strong structural effects is evidenced from elemental cross-sections of the light fragments. The cross-sections for odd-Z fragments are higher for the neutron rich CN while cross-sections for even-Z fragments are higher for the neutron poor CN. Calculations assuming two different potential energy surfaces are presented.

Published
2010
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34. Shell gap reduction in neutron-rich N=17 nuclei

Author

Obertelli, A., Gillibert, A., Alamanos, N., Alvarez, M., Auger, F., Dayras, R., Drouart, A., de France, G., Jurado, B., Keeley, N., Lapoux, V., Mittig, W., Mougeot, X., Nalpas, L., Pakou, A., Patronis, N., Pollacco, E.C., Rejmund, F., Rejmund, M., Roussel-Chomaz, P., Savajols, H., Skaza, F., and Theisen, Ch.

Subjects
Nuclear and High Energy Physics
Published
2006
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35. Decay of excited nuclei produced in $^{78,82}$Kr + $^{40}$Ca reactions at 5.5 MeV/nucleon

Author

Ademard G., Wieleczko J. P., Gomez del Campo J., La Commara M., Bonnet E., Vigilante M., Chbihi A., Frankland J. D., Rosato E., Spadaccini G., Kalandarov S.h. A., Beck C., Barlini S., Borderie B., Bougault R., Dayras R., De Angelis G., De Sanctis J., Kravchuk V. L., Lautesse P., Le Neindre N., Moisan J., Parlog M., Pierroutsakou D., Rivet M. F., Romoli M., Roy R., Adamian G. G., Antonenko N. V., D'ONOFRIO, Antonio, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), G., Ademard, J. P., Wieleczko, J., Gomez del Campo, LA COMMARA, Marco, E., Bonnet, Vigilante, Mariano, A., Chbihi, J. D., Frankland, Rosato, Elio, Spadaccini, Giulio, Kalandarov, S. h. A., C., Beck, S., Barlini, B., Borderie, R., Bougault, R., Dayra, G., De Angeli, J., De Sancti, V. L., Kravchuk, P., Lautesse, N., Le Neindre, J., Moisan, A., D’Onofrio, M., Parlog, D., Pierroutsakou, M. F., Rivet, M., Romoli, R., Roy, G. G., Adamian, N. V., Antonenko, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ademard, G., Wieleczko, J. P., Gomez del Campo, J., La Commara, M., Bonnet, E., Vigilante, M., Chbihi, A., Frankland, J. D., Rosato, E., Spadaccini, G., Beck, C., Barlini, S., Borderie, B., Bougault, R., Dayras, R., De Angelis, G., De Sanctis, J., Kravchuk, V. L., Lautesse, P., Le Neindre, N., Moisan, J., D'Onofrio, Antonio, Parlog, M., Pierroutsakou, D., Rivet, M. F., Romoli, M., Roy, R., Adamian, G. G., and Antonenko, N. V.

Subjects
24.60.Dr, 25.70.Gh, FOS: Physical sciences, 24.10.Pa, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), 24.60.Dr, 24.10.Pa, 25.70.Gh, Nuclear Experiment
Abstract

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 relaxation and are compatible with a fission-like phenomenon. Persistence of structure effects is evidenced from elemental cross-sections ($\sigma_{Z}$) as well as a strong odd-even-staggering (o-e-s) of the light-fragment yields. The magnitude of the staggering does not significantly depend on the neutron content of the emitting system. Fragment-particle coincidences suggest that the light partners in very asymmetric fission are emitted either cold or at excitation energies below the particle emission thresholds. The evaporation residue cross-section of the $^{78}$Kr + $^{40}$Ca reaction is slightly higher than the one measured in $^{82}$Kr + $^{40}$Ca reaction. The fission-like component is larger by $\sim$ 25% for the reaction having the lowest neutron-to-proton ratio. These experimental features are confronted to the predictions of theoretical models. The Hauser-Feshbach approach including the emission of fragments up to $Z$ = 14 in their ground states as well as excited states does not account for the main features of $\sigma_{Z}$. For both reactions, the transition-state formalism reasonably reproduces the $Z$-distribution of the fragments with charge 12 $\le Z \le$ 28. However, this model strongly overestimates the light-fragment cross-sections and does not explain the o-e-s of the yields for 6 $\le Z \le$ 10. The shape of the whole $Z$-distribution and the o-e-s of the light-fragment yields are satisfactorily reproduced within the dinuclear system framework which treats the competition between evaporation, fusion-fission and quasifission processes. The model suggests that heavy fragments come mainly from quasifission while light fragments are predominantly populated by fusion. An underestimation of the cross sections for 16 $\le Z \le$ 22 could signal a mechanism in addition to the capture process., Comment: 2 tables, 14 figures, accepted for publication in Physical Review C

Published
2011
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36. Study of $^{124}$Sn+$^{136}$Xe fusion-evaporation: analysis of a rare-event experiment

Author

Avez, B., Drouart, Antoine, Stodel, C., Simenel, C., Alcantara-Nunez, J.A., Adamczyk, M., Banka, P., Bonnet, Eric, Clément, E., Dayras, R., Force, C., Golabek, C., Gonciarz, A., Grévy, S., Hauschild, K., Jacquet, D., Korichi, A., Kozik, T., Lazko, P., Morjean, M., Popeko, A., Roger, T., Saint-Laurent, M.G., Sosin, Z., Sulignano, B., Theisen, C., Wieloch, A., Yeremin, A., Yilmaz, B., Zielinska, M., Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Smoluchowski Institute of Physics, Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire d'Orsay (IPNO), Flerov Laboratory of Nuclear Reactions [Dubna] (FLNR), Joint Institute for Nuclear Research (JINR), Physics Department, Ankara University, Ankara University, Heavy Ion Laboratory, University of Warsaw (UW), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
fusion-evaporation, Superheavy elements, FOS: Physical sciences, 25.70.Jj, 23.60.+e, 25.85.Ca, 29.85.Fj, 27.90.+b, Statistical data analysis, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Fusion-evaporation in the $^{124}$Sn+$^{136}$Xe system is studied using a high intensity xenon beam provided by the Ganil accelerator and the LISE3 wien filter for the selection of the products. Due to the mass symmetry of the entrance system, the rejection of the beam by the spectrometer was of the order of $5times10^8$. We have thus performed a detailed statistical analysis to estimate random events and to infer the fusion-evaporation cross sections. No signicant decay events were detected and upper limit cross sections of 172 pb, 87 pb and 235 pb were deduced for the synthesis of $^{257}$Rf, $^{258}$Rf and $^{259}$Rf, respectively., Comment: 7 pages, 4 figures

Published
2011

37. Resonances of 6He via the 8He(p,t)6He reaction

Author

Lapoux, L, Mougeot, X, Keeley, N, Drouart, A, Alamanos, N, Auger, F, Avez, B, Beaumel, D, Blumenfeld, Y, Dayras, R, Force, C, Gaudefroy, L, Gillibert, A, Guillot, J, Iwasaki, H, Al Kalanee, T, Kemper, K W, Mermizedakis, T, Mittig, W, Nalpas, L, Pollacco, E, Pakou, S, Roger, T, Roussel-Chomaz, P, Rusek, K, Scarpaci, J A, Simenel, C, Strojek, I, Suzuki, D, and Wolski, R

Subjects
Nuclear Experiment, XX
Abstract

We investigated the low-lying spectroscopy of 6He via the 2-neutron transfer reaction induced by the 8He SPIRAL beam at 15.4 A.MeV on a proton-rich target. The light charged recoil particles produced by the direct reactions were measured using theMUST2 Si-strip telescope array. Two new resonances were observed above the known 2+ state in 6He, and the angular momentum transfer was deduced through the analysis of the angular distributions. Results are discussed in comparison with the recent calculations of various nuclear structure theories which include the coupling to the continuum technique and to the ones which give an understanding of the cluster correlations in the light weakly-bound nuclei.

Published
2010

38. Reaction dynamics and 'hierarchy'effects from light fragments correlations

Author

De Filippo, E., Amorini, F., Anzalone, A., Auditore, L., Baran, V., Berceanu, I., Blicharska, J., Borderie, B., Bougaulti, R., Bruno, M., Brzychczyk, J., Cardella, G., Cavallaro, S., Chatterje, M. B., Chbihi, A., Colonna, M., D'Agostino, M., Dayras, R., Di Toro, M., Emanuele, U., Frankland, J., Galichet, E., Gawlikowicz, W., Geraci, E., Giustolisi, F., Grassi, L., Grzeszczuk, A., Guazzoni, P., Guinet, D., Kowalski, S., La Guidara, E., Lanzalone, G., Lanzanò, G., Le Neindre, N., Lombardo, I., Maiolino, C., Majka, Z., Pagano, A., Papa, M., Petrovici, M., Piasecki, E., Pirrone, S., Planeta, R., Politi, Giuseppe, Pope, A., Porto, F., Rivet, M. F., Rosato, E., Rizzo, Francesca, Russotto, P., Schmidt, K., Siwek Wilczynska, K., Skwira, I., Trifirò, A., Trimarchi, M., Verde, G., Vigilante, M., Wieleczko, J. P., Wilczynski, J., Zetta, L., and Zipper, W.

Published
2010

39. Hierarchy effects in light framents at mid-velocity emission

Author

Amorini, F., Anzalone, A., Auditore, L., Baran, V., Berceanu, I., Blicharska, J., Borderie, B., Bougault, R., Bruno, M., Brzychczyk, J., Cardella, G., Cavallaro, S., Chatterjee, M. B., Chbihi, A., Colonna, M., Agostino, M. D., Dayras, R., Filippo, E., Di Toro, M., Frankland, J. D., Galichet, E., Gawlikowicz, W., Geraci, E., Giustolisi, F., Grassi, L., Grzeszczuk, A., Guazzoni, P., Guinet, D., Kowalski, S., La Guidara, E., Lanzalone, G., Lanzanò, G., Nicolas Le Neindre, Lombardo, I., Maiolino, C., Majka, Z., Pagano, A., Papa, M., Petrovici, M., Piasecki, E., Pirrone, S., Płaneta, R., Politi, G., Pope, A., Porto, F., Rivet, M. F., Rizzo, F., Rosato, E., Russotto, P., Schmidt, K., Siwek-Wilczyńska, K., Skwira, I., Trifirò, A., Trimarchi, M., Verde, G., Vigilante, M., Wieleczko, J. P., Wilczyński, J., Zetta, L., Zipper, W., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Lion, Michel

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Intermediate mass fragments (IMF) emitted with multiplicity MIMF ≥ 3 at mid-velocity in semi-central reactions induced by 124Sn projectile (35 A.MeV) on 64Ni target have been studied. The results show a clear correlation between the fragment sizes and the corresponding transverse velocities. We interpret this correlation as signature of hierarchy effects in nuclear multifragmentation. A correlation with the fragments isospin contents is also found. Qualitative comparisons with SMF calculations suggests that these correlations are good observables for the symmetry term of the EOS at sub-saturation density.

Published
2010

40. Resonances of 6He via the 8He(p,t)6He reaction

Author

Lapoux, V., Mougeot, X., Keeley, N., Drouart, A., Alamanos, N., Auger, F., Avez, B., Beaumel, D., Blumenfeld, Y., Dayras, R., Force, C., Gaudefroy, L., Gillibert, A., Guillot, J., Iwasaki, H., Al Kalanee, T., W. Kemper, K., Mermizedakis, T., Mittig, W., Nalpas, L., Pollacco, E., Pakou, A., Roger, T., Roussel-Chomaz, P., Rusek, K., Scarpaci, J.-A., Simenel, C., Suzuki, D., Wolski, R., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Théorique et Appliquée (DPTA), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), F. Cerutti, A. Ferrari, SPIRAL, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Lion, Michel

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

CERN-Proceedings-2010-001 available at http://www.fluka.org/Varenna2009/procmat.htm; International audience; We investigated the low-lying spectroscopy of 6He via the 2-neutron transfer reaction induced by the 8He SPIRAL beam at 15.4 A.MeV on a proton-rich target. The light charged recoil particles produced by the direct reactions were measured using theMUST2 Si-strip telescope array. Two new resonances were observed above the known 2+ state in 6He, and the angular momentum transfer was deduced through the analysis of the angular distributions. Results are discussed in comparison with the recent calculations of various nuclear structure theories which include the coupling to the continuum technique and to the ones which give an understanding of the cluster correlations in the light weakly-bound nuclei.

Published
2009

41. Dynamical multifragmentation and time scale determination from fragments correlations in neutron poor and neutron rich systems

Author

DE FILIPPO, E., Amorini, F., Anzalone, A., Auditore, L., Baran, V., Benisz, A., Berceanu, I., Blicharska, J., Borderie, B., Bougault, R., Bruno, M., Brzychczyk, J., Cardella, G., Cavallaro, S., Chatterjee, M. B., Chbihi, A., Colonna, M., Dagostino, M., Dayras, R., DI TORO, M., Emanuele, U., Frankland, J., Galichet, E., Gawlikowicz, W., Geraci, E., Giustolisi, F., Grassi, L., Grzeszczuk, A., Guazzoni, P., Guinet, D., Kowalski, S., LA GUIDARA, E., Lanzalone, G., Lanzanò, G., LE NEINDRE, N., Lombardo, I., Maiolino, C., Majka, Z., Pagano, A., Papa, M., Petrovici, M., Piasecki, E., Pirrone, S., Planeta, R., Politi, Giuseppe, Pop, A., Porto, F., Rivet, M. F., Rosato, E., Rizzo, Francesca, Russotto, P., Schmidt, K., SIWEK WILCZYNSKA, K., Skwira, I., Sochocka, A., Trifirò, A., Trimarchi, M., Verde, G., Vigilante, M., Wieleczko, J. P., Wilczy, J., Ski, Zetta, L., and Zipper, W.

Published
2009

42. Signal of dynamical multifragmentation as seen by CHIMERA detector

Author

Russotto, P., DE FILIPPO, E., Pagano, A., Amorini, F., Anzalone, A., Auditore, L., Baran, V., Berceanu, I., Brzychczyk, J., Borderie, B., Bougault, R., Bruno, M., Cardella, G., Cavallaro, S., Chatterjeee, M. B., Chbihi, A., Colonna, M., Dagostino, M., Dayras, R., DI TORO, M., Frankland, J., Galichet, E., Gawlikowicz, W., Geraci, E., Giustolisi, F., Grzeszczuk, A., Guazzoni, P., Guinet, D., Kowalski, S., LA GUIDARA, E., Lanzalone, G., Lanzano, G., LE NEINDRE, N., Maiolino, C., Majka, Z., Papa, M., Petrovici, M., Piasecki, E., Pirrone, S., Planeta, R., Politi, Giuseppe, Pop, A., Porto, F., Rivet, M. F., Rizzo, Francesca, Rosato, E., Schmidt, K., SIWEK WILCZYNSKA, K., SKWIRA CHALOT, I., Sochocka, A., Swiderski, L., Trifiro, A., Trimarchi, M., Vigilante, M., Wieleczko, J. P., Wilczynski, J., Zetta, L., and Zipper, W.

Published
2008

43. Centrality dependence of isospin effect signature in 124Sn+64Ni and 112Sn+64Ni reactions

Author

Planeta, R., Amorini, F., Anzalone, A., Auditore, L., Baran, V., Benisz, A., Berceanu, I., Bonasera, A., Borderie, B., Borgenztajn, J., Bougault, R., Bruno, M., Brzychczyk, J., Cardella, G., Cavallaro, S., Chatterjeee, M. B., Chbihi, A., Colonna, M., Dagostino, M., Dayras, R., DE FILIPPO, E., DI TORO, M., Frankland, J., Galichet, E., Gawlikowicz, W., Geraci, E., Giuliani, G., Giustolisi, F., Grzeszczuk, A., Guazzoni, P., Guinet, D., Kowalski, S., Krauze, M., LA GUIDARA, E., Lanzalone, G., Lanzan, G., LE NEINDRE, N., Lukasik, J., Maiolino, C., Majka, Z., Nicolis, N. G., Pagano, A., Papa, M., Petrovici, M., Piasecki, E., Pirrone, S., Politi, Giuseppe, Porto, F., Pop, A., Rivet, M. F., Rizzo, Francesca, Rosato, E., Russotto, P., Schmidt, K., SIWEK WILCZYNSKA, K., SKWIRA CHALOT, I., Sochocka, A., Swiderski, Trifiro, A., Trimarchi, M., Vannini, G., Vigilante, M., Wieleczko, J. P., Wilczynski, J., Zetta, L., and Zipper, W.

Published
2008

44. Source shape determination with directional fragment-fragment velocity correlations

Author

Le Fevre, Arnaud, Schwarz, Carsten, Auger, G., Begemann-Blaich, M. L., Bellaize, N., Bittiger, R., Bocage, F., Borderie, B., Bougault, R., Bouriquet, B., Charvet, J. L., Chbihi, A., Dayras, R., Durand, D., Frankland, J. D., Galichet, E., Gourio, D., Guinet, D., Hudan, S., Lautesse, P., Lavaud, F., Legrain, R., Lopez, O., Łukasik, J., Lynen, U., Müller, Walter, Nalpas, L., Orth, Herbert, Plagnol, E., Rosato, E., Saija, A., Sfienti, C., Tamain, B., Trautmann, Wolfgang, Trzciński, A., Turzó, K., Vient, E., Vigilante, M., Volant, C., Zwiegliński, B., A., Le Fèvre, C., Schwarz, G., Auger, M. L., Begemann Blaich, N., Bellaize, R., Bittiger, F., Bocage, B., Borderie, R., Bougault, B., Bouriquet, J. L., Charvet, A., Chbihi, R., Dayra, D., Durand, J. D., Frankland, E., Galichet, D., Gourio, D., Guinet, S., Hudan, P., Lautesse, F., Lavaud, R., Legrain, O., Lopez, J., Łukasik, U., Lynen, W. F. J., Müller, L., Nalpa, H., Orth, E., Plagnol, Rosato, Elio, A., Saija, C., Sfienti, B., Tamain, W., Trauttmann, A., Trzciński, K., Turzó, E., Vient, Vigilante, Mariano, C., Volant, B., Zwiegliński, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Conservatoire National des Arts et Métiers [CNAM] (CNAM), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), ALADIN, INDRA, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, 25.70.Pq, 24.60.-k, 25.75.Gz, Correlation functions, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Breakup state, 0103 physical sciences, Heavy ion collisions, Incident energy, ddc:530, Sensitivity (control systems), Nuclear Experiment (nucl-ex), Coordinate space, 010306 general physics, Nuclear Experiment, Physics, Multifragmentation, 010308 nuclear & particles physics, Fragment (computer graphics), Breakup, Computational physics, Volume (thermodynamics), Beam direction, Atomic physics, Nucleon
Abstract

Correlation functions, constructed from directional projections of the relative velocities of fragments, are used to determine the shape of the breakup volume in coordinate space. For central collisions of 129Xe + natSn at 50 MeV per nucleon incident energy, measured with the 4pi multi-detector INDRA at GSI, a prolate shape aligned along the beam direction with an axis ratio of 1:0.7 is deduced. The sensitivity of the method is discussed in comparison with conventional fragment-fragment velocity correlations., 12 pages, 5 figures, subm. to Phys. Lett. B

Published
2008

45. Transition from participant to spectator fragmentation in Au+Au reactions between 60A and 150A MeV

Author

Zbiri, K., Le Fevre, A., Aichelin, Joerg, Lukasik, J., Reisdorf, W., Gulminelli, F., Lynen, U., Müller, W.F.J., Orth, H., Schwarz, C., Sfienti, C., Trautmann, W., Turzó, K., Zwieglinski, B., Auger, G., Charvet, J.L., Chbihi, A., Dayras, R., Durand, D., Frankland, J.D., Legrain, R., Le Neindre, N., Lopez, O., Nalpas, L., Pârlog, M., Plagnol, E., F. Rivet, M., Rosato, E., Vient, E., Vigilante, M., Volant, C., Wieleczko, J.P., Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), APC - Cosmologie, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), ALADIN, INDRA, Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Theory (nucl-th), Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Nuclear Experiment
Abstract

Using the quantum molecular dynamics approach, we analyze the results of the recent INDRA Au+Au experiments at GSI in the energy range between 60 AMeV and 150 AMeV. It turns out that in this energy region the transition toward a participant-spectator scenario takes place. The large Au+Au system displays in the simulations as in the experiment simultaneously dynamical and statistical behavior which we analyze in detail: The composition of fragments close to midrapidity follows statistical laws and the system shows bi-modality, i.e. a sudden transition between different fragmentation pattern as a function of the centrality as expected for a phase transition. The fragment spectra at small and large rapidities, on the other hand, are determined by dynamics and the system as a whole does not come to equilibrium, an observation which is confirmed by FOPI experiments for the same system., Comment: published version

Published
2007

46. Study of N=16 for Ne isotopes

Author

Gillibert, A., Obertelli, A., Alamanos, N., Alvarez, M., Auger, F., Dayras, R., Drouart, A., de France, G., Jurado, B., Keeley, N., Lapoux, V., Mittig, W., Mougeot, X., Nalpas, L., Pakou, A., Patronis, N., Pollacco, E., Rejmund, F., Rejmund, M., Roussel-Chomaz, P., Savajols, H., Skaza, F., and Theisen, C.

Subjects
onset
Abstract

Ne-27 has been investigated through the one neutron transfer reaction Ne-26(d,p)Ne-27 in inverse kinematics at 9.7 MeV/nucleon. The results support the existence of a low lying negative parity state in Ne-27 which is a signature of a reduced sd-fp shell gap in the N = 16 neutron rich region, at variance with stable nuclei. European Physical Journal-Special Topics

Published
2007

47. Investigation of the isospin dependences in Sn+Ni and Sn+Al system

Author

Schmidt, K., Amorini, F., Anzalone, A., Auditore, L., Baran, V., Benisz, A., Berceanu, I., Bonasera, A., Borderie, B., Borgensztajn, J., Bougault, R., Bruno, M., Cardella, G., Cavallaro, S., Coniglione, R., Chatterjee, M. B., Chbihi, A., Colonna, M., D'Agostino, M., Dayras, R., DI TORO, E. DE FILIPPO M., Frankland, J., Galichet, E., Gawlikowicz, W., Geraci, E., Giuliani, G., Giustolisi, F., Grzeszczuk, A., Guazzoni, P., Guinet, D., Kowalski, S., LA GUIDARA, E., Lanzalone, G., Lanzano, G., Neindre, Le, Lukasik, J., Maiolino, C., Majka, Z., Nicolis, N. G., Pagano, A., Papa, M., Petrovici, M., Piasecki, E., Pirrone, S., Planeta, R., Politi, Giuseppe, Pop, A., Porto, F., Rivet, M. F., Rizzo, Francesca, Rosato, E., Russo, S., Russotto, P., SIWEK WILCZYNSKA, K., SKWIRA CHALOT, I., Sochocka, A., Swiderski, L., Trifiro, A., Trimarchi, M., Vannini, G., Vigilante, M., Wieleczko, J. P., Wilczynski, J., Zetta, L., and Zipper, W.

Published
2007

48. Dynamical emission of heavy fragments in the 112,124Sn+58,64Ni system at 35 MeV/nucleon as seen with CHIMERA

Author

Russotto, P., Piasecki, E., Amorini, F., Anzalone, A., Auditore, L., Baran, V., Berceanu, I., Blicharska, J., Brzychczyk, J., Borderie, B., Bougault, R., Bruno, M., Cardella, G., Cavallaro, S., Chatterjee, M. B., Chbihi, A., Colonna, M., D'Agostino, M., Dayras, R., DI TORO, E. DE FILIPPO M., Frankland, J., Galichet, E., Gawlikowicz, W., Geraci, E., Giustolisi, F., Grzeszczuk, A., Guazzoni, P., Guinet, D., Kowalski, S., LA GUIDARA, E., Lanzalone, G., Lanzano, G., Neindre, Le, Maiolino, C., Majka, Z., Pagano, A., Papa, M., Petrovici, M., Pirrone, S., Planeta, R., Politi, Giuseppe, Pop, A., Porto, F., Rivet, M. F., Rizzo, Francesca, Rosato, E., Schmidt, K., SIWEK WILCZYNSKA, K., SKWIRA CHALOT, I., Sochocka, A., Swiderski, L., Trifiro, A., Trimarchi, M., Vigilante, M., Wieleczko, J. P., Wilczynski, J., Zetta, L., and Zipper, W.

Published
2007

49. Shell Gap Reduction In Exotic N = 17 Nuclei

Author

Obertelli, A., Alamanos, N., Alvarez, M., Auger, F., Dayras, R., Drouart, A., de France, G., Gillibert, A., Jurado, B., Keeley, N., Lapoux, V., Mittig, W., Mougeot, X., Nalpas, L., Pakou, A., Patronis, N., Pollacco, E., Rejmund, F., Rejmund, M., Roussel-Chomaz, P., Savajols, H., Skaza, F., Theisen, Ch., Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), S.V. Harissopulos, P. Demetriou, E. Julin, EXOGAM, SPIRAL, and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, nuclei with mass number 20 to 38, Nuclear Theory, chemistry.chemical_element, 020206 networking & telecommunications, Parity (physics), 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 25.40.Hs, 27.30.+t, 21.10.Hw, Nuclear physics, Neon, chemistry, 0202 electrical engineering, electronic engineering, information engineering, High Energy Physics::Experiment, 020201 artificial intelligence & image processing, Neutron, neutron-nucleus reactions, neon, Atomic physics, Nuclear Experiment, Nucleon, Gap reduction, nuclear parity
Abstract

An experimental spectroscopic investigation of some neutron rich Mg and Al isotopes around the shell closure N=20 has been performed. The delayed neutron and $\gamma$ spectra, following the $\beta$-decay of $^{33}$Mg and $^{35}$Al have been measured using the delayed neutron detector array TONNERRE coupled with high efficiency EXOGAM clover detectors, a LEPS detector and eight low-energy neutron detectors. A detailed analysis of such spectra allows one to construct the level schemes of their daughters, $^{32,33)$Al and $^{34,35}$Si. The resulting spectroscopic information will provide stringent tests of large scale shell model calculations including np - nh excitations aimed at the understanding of the structural effects occurring in this region.

Published
2006

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