Descriptor: "multifragmentation" / Topic: nuclear experiment - Searchworks@Jio Institute Digital Library Search Results

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40 results on '"multifragmentation"'

1. Study of final-state interactions of protons in neutrino-nucleus scattering with INCL and NuWro cascade models

Author: A. Ershova, S. Bolognesi, A. Letourneau, J.-C. David, S. Dolan, J. Hirtz, K. Niewczas, J. T. Sobczyk, A. Blanchet, M. Buizza Avanzini, J. Chakrani, J. Cugnon, C. Giganti, S. Hassani, C. Juszczak, L. Munteanu, V. Q. Nguyen, D. Sgalaberna, S. Suvorov, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)
Subjects: deuteron, accelerator, Nuclear Theory, FOS: Physical sciences, interaction, E,EP, final state, ENERGY-DEPENDENCE, Neutrino interactions, Nucleus-neutrino interactions, neutrino, High Energy Physics - Phenomenology (hep-ph), MONTE-CARLO CALCULATIONS, propagation, Nuclear Experiment, cluster, INTRANUCLEAR CASCADES, CA-40, neutrino nucleus, Particle Physics - Phenomenology, MULTIFRAGMENTATION, model, REACTION CROSS-SECTIONS, RANGE, scattering, nucleus, nucleon, hep-ph, oscillation, final-state interaction, cascade, High Energy Physics - Phenomenology, transverse, Physics and Astronomy, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], SIMULATION, production
Abstract: The modeling of neutrino-nucleus interactions constitutes a challenging source of systematic uncertainty for the extraction of precise values of neutrino oscillation parameters in long-baseline accelerator neutrino experiments. To improve such modeling and minimize the corresponding uncertainties, a new generation of detectors is being developed, which aim to measure the complete final state of particles resulting from neutrino interactions. In order to fully benefit from the improved detector capabilities, precise simulations of the nuclear effects on the final-state nucleons are needed. This article presents the study of the in-medium propagation of knocked-out protons, i.e., final-state interactions (FSI), comparing the NuWro and INCL cascade models. The INCL model is used here for the first time to predict exclusive final states in measured neutrino interaction cross sections. This study of INCL in the framework of neutrino interactions features various novelties, including the production of nuclear clusters (e.g., deuterons, α particles) in the final state. The paper includes a complete characterization of the final state after FSI, comparisons to available measurements of single transverse variables, and an assessment of the observability of nuclear clusters., Physical Review D, 106 (3), ISSN:1550-7998, ISSN:0556-2821, ISSN:1550-2368
Published: 2022

2. Isotopic yields in peripheral heavy-ion collisions

Author: BULUT GÜLBEYAZ, Fatma, BÜYÜKÇİZMECİ, Nihal, OĞUL, Rıza, and ALKÜ
Subjects: projectile fragments, multifragmentation, symmetry energy, isotopic yield,multifragmentation,projectile fragments,symmetry energy, Nuclear Experiment, isotopic yield
Abstract: We have calculated production cross sections and isotopic distributions of the projectilefragments emerging from the reactions 112,124Sn + 112,124Snat 50 MeV/nucleon incident beam energy, performed at the cyclotron of Michigan State University (MSU). For the interpretation of the data, we carriedout the calculations within the statistical multifragmentation model (SMM). Thepossible modification of symmetry energy parameter, in the multifragmentationregion at the low density freeze-out has been studied. It is shown that a significant reductionof the symmetry energy term is found necessary to reproduce experimental data.The results are in agreement with recent findings.
Published: 2019

3. Fragment Composition in Central Heavy-Ion Collisions

Author: İmal Avcı, Hamide, Büyükçizmeci, Nihal, Oğul, Rıza, and ALKÜ
Subjects: central collisions,fragment yield,multifragmentation,symmetry energy, multifragmentation, symmetry energy, Nuclear Experiment, fragment yield, central collisions
Abstract: Charge, massand isotopic distributions of fragments formed in the central collisions ofneutron poor and neutron rich elements 112Sn + 112Sn and 124Sn+ 124Sn have been theoretically calculated and compared to theexperimental data. Influence of surface and symmetry terms on charge andisotopic distributions, at low density freeze-out were investigated. We show that significant reduction of thesymmetry term coefficient leads to better reproduction of the isotopicdistributions, while the surface term effect is negligible. This is inagreement with our previous findings obtained from the interpretation of bothcentral and peripheral heavy ion collisions.
Published: 2018

4. Violent Nuclear Reactions: Large-Amplitude Nuclear Dynamic Phenomena in Fermionic Systems

Author: Napolitani, Paolo, 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), Université Paris Sud, Orsay, Elias Khan, and Napolitani, Paolo
Subjects: [PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th], Heavy-ion collisions, modèles de transport, Multifragmentation, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Theory, Spallation reactions, FOS: Physical sciences, Réactions de spallation, Transport model calculations, Nuclear Theory (nucl-th), 24.10.Cn, 05.10.Gg, 25.70.Pq, 25.40.Sc, Collisions d'ions lourds, Boltzmann-Langevin-One-Body, Nuclear Experiment, Symmetry energy
Abstract: Violent nuclear collisions are open systems which require a non-equilibrium description when the process should be followed from the first instants. The heated system produced in the collision, can no more be treated within an independent-particle picture and additional correlations should be taken into account: they rely to in-medium dissipation and phase-space fluctuations. Their interplay with the one-body collective behaviour activates the transport dynamics: large-amplitude fluctuations and bifurcations in a variety of mechanisms appear, from fusion to neck formation till eventually freezing out the system into several intermediate-mass clusters. Starting from fundamental concepts tested on nuclear matter, a microscopic description is built up to address violent processes occurring in heavy-ion collisions at Fermi energies and in spallation reactions, and it is applied to experimental observables., HDR report. Review written in order to be conferred the French accreditation to supervise research (Habilitation \`a diriger des recherches)
Published: 2018

5. Isotopic dependence of the caloric curve

Author: The ALADIN2000 Collaboration, Trautmann, W., Adrich, P., Aumann, T., Bacri, C. O., Barczyk, T., Bassini, R., Bianchin, S., Boiano, C., Botvina, A. S., Boudard, A., Brzychczyk, J., Chbihi, A., Cibor, J., Czech, B., De Napoli, M., Ducret, J. -E., Emling, H., Frankland, J. D., Hellstroem, M., Henzlova, D., Imme, G., Iori, I., Johansson, H., Kezzar, K., Lafriakh, A., Fevre, A. Le, Gentil, E. Le, Leifels, Y., Luehning, J., Lukasik, J., Lynch, W. G., Lynen, U., Majka, Z., Mocko, M., Mueller, W. F. J., Mykulyak, A., Orth, H., Otte, A. N., Palit, R., Pawlowski, P., Pullia, A., Raciti, G., Rapisarda, E., Sann, H., Schwarz, C., Sfienti, C., Simon, H., Suemmerer, K., Tsang, M. B., Verde, G., Volant, C., Wallace, M., Weick, H., Wiechula, J., Wieloch, A., Zwieglinski, B., 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), ALADIN2000, 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), 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: Nuclear and High Energy Physics, Nuclear Theory, Nuclear caloric curve, FOS: Physical sciences, Limiting temperature, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Caloric curve, Nuclear physics, 0103 physical sciences, Incident energy, Nuclear Experiment (nucl-ex), Invariant (mathematics), Isotopic effects, Nuclear Experiment, 010306 general physics, Projectile fragmentation, Physics, Range (particle radiation), Multifragmentation, Spectrometer, 010308 nuclear & particles physics, Microscopic models, Breakup, Isotope temperature, Nucleon, Radioactive beams
Abstract: Isotopic effects in projectile fragmentation at relativistic energies have been studied with the ALADIN forward spectrometer at SIS. Stable and radioactive Sn and La beams with an incident energy of 600 MeV per nucleon have been used in order to explore a wide range of isotopic compositions. Chemical freeze-out temperatures are found to be nearly invariant with respect to the A/Z ratio of the produced spectator sources, consistent with predictions for expanded systems. Consequences for the proposed interpretation of chemical breakup temperatures as representing the limiting temperatures predicted by microscopic models are discussed., Comment: 7 pages, 4 figures, contribution to proceedings of International School of Nuclear Physics, 30th Course, Heavy-Ion Collisions from the Coulomb Barrier to the Quark-Gluon Plasma, Erice-Sicily: 16 - 24 September 2008
Published: 2009

6. Multifragmentation threshold in 93Nb+natMg collisions at 30 MeV/nucleon

Author: M.F. Rivet, S. Pirrone, E. Rosato, M. Papa, N. Le Neindre, M. Pârlog, B. Borderie, F. Porto, D. Guinet, J.D. Frankland, S. Lo Nigro, G. Cardella, Chimera Collaborations, A. Pagano, P. Guazzoni, E. Vient, M. Vigilante, S. Femino, F. Giustolisi, O. Lopez, L. Manduci, F. Rizzo, G. Lanzanó, S. Cavallaro, R. Bougault, J. P. Wieleckzo, L. Sperduto, P. Lautesse, Luisa Zetta, B. Tamain, E. de Filippo, G. Politi, G. Lanzalone, S. Aiello, A. Anzalone, R. Dayras, R. Roy, J. C. Steckmeyer, 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, 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 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), Dipartimento di Scienze Fisiche e Sezione (INFN), Istituto Nazionale di Fisica Nucleare (INFN)-Università degli studi di Napoli Federico II, Laboratoire de Physique Nucléaire (IPN), Université Laval [Québec] (ULaval), Laboratori Nazionali del Sud (LNS), Istituto Nazionale di Fisica Nucleare (INFN), Istituto Nazionale di Fisica Nucleare, Sezione di Catania (INFN), Università degli studi di Catania [Catania], Dipartimento di Fisica, Università di Messina, Istituto Nazionale di Fisica Nucleare, Sezione di Milano (INFN), collaboration INDRA et CHIMERA, 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), 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)-Centre National de la Recherche Scientifique (CNRS), Istituto Nazionale di Fisica Nucleare (INFN)-University of Naples Federico II = Università degli studi di Napoli Federico II, and Università degli studi di Catania = University of Catania (Unict)
Subjects: Nuclear and High Energy Physics, Particle physics, excitation energy, multifragmentation, Nuclear Theory, FOS: Physical sciences, Binary number, Astrophysics::Cosmology and Extragalactic Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, GEMINI, 0103 physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, backtracing, Physics, 010308 nuclear & particles physics, Charge (physics), binary sequential, SMM, 25.70.-z 25.70.Pq 24.10.Pa, Nucleon, Energy (signal processing), Excitation
Abstract: We analyzed the $^{93}Nb$ on $^{nat}Mg$ reaction at 30 MeV/nucleon in the aim of disentangling binary sequential decay and multifragmentation decay close to the energy threshold, i.e. $\simeq 3$ MeV/nucleon. Using the backtracing technique applied to the statistical models GEMINI and SMM we reconstruct simulated charge, mass and excitation energy distributions and compare them to the experimental ones. We show that data are better described by SMM than by GEMINI in agreement with the fact that multifragmentation is responsible for fragment production at excitation energies around 3 MeV/nucleon., 16 pages, 12 figures, 5 tables Soumis \`a Nuclear Physics A
Published: 2008

7. Kinetic energy spectra for fragments and break-up density in multifragmentation

Author: Ad. R. Raduta, M.F. Rivet, Bernard Borderie, E. Bonnet, Silvia Piantelli, N. Le Neindre, 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), Nuclear Institute for Physics and Nuclear Engineering (NIPNE), Nuclear Institute for Physics and Nuclear Engineering, 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: Physics, Nuclear and High Energy Physics, Multifragmentation, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Break-Up, 010308 nuclear & particles physics, fragment kinetic energy, FOS: Physical sciences, microcanonical model, Kinetic energy, 01 natural sciences, Spectral line, Nuclear Theory (nucl-th), Fragmentation (mass spectrometry), 25.70.Pq, 24.10.Pa, 0103 physical sciences, Low density, Atomic physics, Nuclear Experiment, 010306 general physics, Nuclear theory, Excitation, Nuclear density
Abstract: We investigate the possibility, in nuclear fragmentation, to extract information on nuclear density at break-up from fragment kinetic energy spectra using a simultaneous scenario for fragment emission. The conclusions we derive are different from the recently published results of Viola et al. [Phys. Rev. Lett. 93, (2004), 132701] assuming a sequential fragment emission and claiming that the experimentally observed decrease of peak centroids for kinetic energy spectra of fragments with increasing bombarding energy is due to a monotonic decrease of the break-up density., Comment: 6 pages, 3 figures
Published: 2005

8. Model-independent tracking of criticality signals in nuclear multifragmentation data

Author: C. Sfienti, R. Bougault, P. Lautesse, A. Saija, H. Orth, J. Marie, C. Schwarz, J.D. Frankland, E. Vient, D. Guinet, M. Pichon, M.F. Rivet, J.L. Charvet, C. Volant, R. Dayras, A. Trzcinski, M. Pârlog, A. Chbihi, M.L. Begemann-Blaich, A. Le Fèvre, D. Durand, Alexis Mignon, R. Legrain, W. Trautmann, Elio Rosato, L. Nalpas, Mariano Vigilante, B. Borderie, J. Lukasik, W. F. J. Müller, E. Galichet, J.P. Wieleczko, R. Roy, K. Turzo, B. Tamain, N. Le Neindre, L. Manduci, A. Van Lauwe, C. Escano-Rodriguez, U. Lynen, R. Bittiger, D. Cussol, O. Lopez, B. Zwieglinski, 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), ALADIN, INDRA, J. D., Frankland, A., Chbihi, A., Mignon, M. L., Begemann Blaich, R., Bittinger, B., Borderie, R., Bougault, J. L., Charvet, D., Cussol, R., Dayra, D., Durand, C., Escano Rodriguez, E., Galichet, D., Guinet, P., Lautesse, A., Le Fèvre, R., Legrain, N., Le Neindre, O., Lopez, J., Lukasik, U., Lynen, L., Manduci, J., Marie, W. F. J., Müller, L., Nalpa, H., Orth, M., Pârlog, M., Pichon, M. F., Rivet, R., Roy, Rosato, Elio, A., Saija, C., Schwarz, C., Sfienti, B., Tamain, W., Trautmann, A., Trczinski, K., Turzó, A., van Lauwe, E., Vient, Vigilante, Mariano, C., Volant, J. P., Wieleczko, B., Zwieglinski, Gesellschaft für Schwerionenforschung mbH (MBH), Gesellschaft für Schwerionenforschung mbH, 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), 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), Institute of Nuclear Physics (IFJ-PAN), Institute of Nuclear Physics, National Institute for Physics and Nuclear Engineering (NIPNE), National Institute for Physics and Nuclear Engineering, Dipartimento di Scienze Fisiche e Sezione (INFN), Istituto Nazionale di Fisica Nucleare (INFN)-Università degli studi di Napoli Federico II, Laboratoire de Physique Nucléaire (IPN), Université Laval [Québec] (ULaval), Soltan Institute for Nuclear Studies (SINS), Soltan Institute, 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 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), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), 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), and Istituto Nazionale di Fisica Nucleare (INFN)-University of Naples Federico II = Università degli studi di Napoli Federico II
Subjects: Nuclear reaction, Nuclear and High Energy Physics, Phase transition, 25.70.Pq, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, order parameter, Nuclear physics, 0103 physical sciences, Statistical physics, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Scaling, Physics, Range (particle radiation), Multifragmentation, 010308 nuclear & particles physics, Fermi energy, Function (mathematics), critical phenomena, Symmetric systems, Criticality, phase transition, Impact parameter, Event (particle physics), Dimensionless quantity
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: 2005

9. Thermal bremsstrahlung photons probing the nuclear caloric curve

Author: H. Delagrange, Yves Roland Schutz, R. Ostendorf, David D'Enterria, Herbert Löhner, R. Ortega, Laurent Bernard Aphecetche, G. Martinez, Hans Wilschut, F. Fernández, KVI - Center for Advanced Radiation Technology, Laboratoire SUBATECH Nantes (SUBATECH), and 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)
Subjects: DYNAMICS, Nuclear and High Energy Physics, Photon, Star (game theory), Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], HEAVY-ION COLLISIONS, 01 natural sciences, 7. Clean energy, GAS PHASE-TRANSITION, Caloric curve, Nuclear physics, TEMPERATURES, 0103 physical sciences, Thermal, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, caloric curve, Physics, HOT, MULTIFRAGMENTATION, 010308 nuclear & particles physics, Bremsstrahlung, Photon spectra, hard photons, nucleus-nucleus reactions, Excitation, Fermi Gamma-ray Space Telescope
Abstract: Hard-photon (E$_{\gamma}>$ 30 MeV) emission from second-chance nucleon-nucleon Bremsstrahlung collisions in intermediate energy heavy-ion reactions is studied employing a realistic thermal model. Photon spectra and yields measured in several nucleus-nucleus reactions are consistent with an emission from hot nuclear systems with temperatures $T\approx$ 4 - 7 MeV. The corresponding caloric curve in the region of excitation energies $\epsilon^\star\approx$ 3{\it A} - 8{\it A} MeV shows lower values of $T$ than those expected for a Fermi fluid., Comment: 13 pages, 3 figures. To appear in Physics Letters B
Published: 2002

10. Investigation of collective radial expansion and stopping in heavy ion collisions at Fermi energies

Author: J.P. Wieleczko, Maria Colonna, E. Bonnet, J.D. Frankland, A. Chbihi, D. Gruyer, 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), Laboratori Nazionali del Sud (LNS), Istituto Nazionale di Fisica Nucleare (INFN), and 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)
Subjects: Nuclear and High Energy Physics, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], multifragmentation, FOS: Physical sciences, Position and momentum space, Kinematics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, stopping, Nuclear physics, Nuclear Theory (nucl-th), expansion, Fragmentation (mass spectrometry), 0103 physical sciences, semi-classical model, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Collision, fragment production, Heavy ion, Atomic physics, Beam energy, Shape analysis (digital geometry), Fermi Gamma-ray Space Telescope
Abstract: We present an analysis of multifragmentation events observed in central Xe+Sn reactions at Fermi energies. Performing a comparison between the predictions of the Stochastic Mean Field (SMF) transport model and experimental data, we investigate the impact of the compression-expansion dynamics on the properties of the final reaction products. We show that the amount of radial collective expansion, which characterizes the dynamical stage of the reaction, influences directly the onset of multifragmentation and the kinematic properties of multifragmentation events. For the same set of events we also undertake a shape analysis in momentum space, looking at the degree of stopping reached in the collision, as proposed in recent experimental studies. We show that full stopping is achieved for the most central collisions at Fermi energies. However, considering the same central event selection as in the experimental data, we observe a similar behavior of the stopping power with the beam energy, which can be associated with a change of the fragmentation mechanism, from statistical to prompt fragment emission., Comment: 15 pages
Published: 2014

11. HCl-induced ionization and fragmentation of fullerenes and organic molecules

Subjects: HIGHLY-CHARGED IONS, ENERGY, ATOMS, C-60 FRAGMENTATION, MULTIFRAGMENTATION, DEPENDENCE, EXCITATION, Physics::Atomic and Molecular Clusters, MULTIPLICITY, ELECTRON-CAPTURE, SLOW COLLISIONS, Nuclear Experiment
Abstract: The interaction of multiply charged ions with fullerenes is governed by electron capture as well as nuclear and electronic stopping, The fullerene excitation due to electronic stopping leads mainly to direct ionization and multifragmentation. Our experiments show that the according patterns in the fragmentation spectra can serve as fingerprints for the electronic stopping. A quantitative analysis of the cross sections for ionization and multifragmentation reveals the characteristic linearity in the projectile velocity v as well as an oscillatory dependence on the projectile atomic number Z. The pi -electron dominated electronic structure of fullerenes has some similarities to that of biomolecular species. Qualitatively similar dynamics are therefore expected to occur in HCI collisions with biomolecules. First experimental results indeed indicate a strong dependence of the fragmentation pattern on projectile charge state and velocity.
Published: 2001

12. A systematic study of the nuclear caloric curve

Author: R. Bassini, B. Zwieglinski, B. Ocker, J. Pochodzalla, A. Wörner, W. Trautmann, U. Kleinevoss, C. Gross, Giuseppe Verde, G. Riccobene, M. Mahi, T. Möhlenkamp, A. Schüttauf, G. Raciti, U. Lynen, A. Trzcinski, W. Seidel, S. Fritz, Francesco Romano, M.L. Begemann-Blaich, T. Odeh, Hongfei Xi, M. Schnittker, I. Iori, G. Imme, V. Serfling, A. Sajia, S. J. Gaff, Cornelius Schwarz, Gerd Joachim Kunde, W. D. Kunze, C. Sfienti, N. Giudice, and W. F. J. Müller
Subjects: Physics, Phase transition, education.field_of_study, Isotope, Population, Caloric theory, Atomic physics, Nuclear Experiment, GAS PHASE-TRANSITION, AU+AU COLLISIONS, MULTIFRAGMENTATION, POPULATIONS, EMISSION, General Agricultural and Biological Sciences, education, Nuclear matter, Caloric curve
Abstract: Temperature-excitation energy correlation measurements on several systems at different incident energies are discussed in the framework of the investigation on possible liquid-gas phase transition in nuclear matter. Results are compared to the presently available experimental caloric curves. Moreover theisotope and theexcited states temperatures, extracted from double ratios of isotope yields and population ratios of fragment unbound states, respectively, are compared. p ]The differences on the temperatures deduced from the two methods cannot be accounted for by the sequential feeding corrections. Instead, they seem to be related to the space-time evolution of the fragmentation process.
Published: 1998

13. N and Z odd-even staggering in Kr + Sn collisions at Fermi energies

Author: Piantelli, S., Casini, G., Valdrè, S., Bougault, R., Bonnet, E., Borderie, B., Chbihi, A., Frankland, J., Gruyer, D., Lopez, O., Le Neindre, N., Pârlog, M., Maurenzig, P., Rivet, M., Vient, E., Rosato, E., Spadaccini, G., Vigilante, M., Bruno, M., Marchi, T., Morelli, L., Cinausero, M., Degerlier, M., Olmi, A., Gramegna, F., Kozik, T., Twaróg, T., Alba, R., Maiolino, C., Santonocito, D., Barlini, S., Bini, M., Carboni, S., Pasquali, G., Poggi, G., Stefanini, A., Istituto Nazionale di Fisica Nucleare, Sezione di Firenze (INFN, Sezione di Firenze), Istituto Nazionale di Fisica Nucleare (INFN), 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 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), Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (INFN, Sezione di Napoli), 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), S., Piantelli, G., Casini, P. R., Maurenzig, A., Olmi, S., Barlini, M., Bini, S., Carboni, G., Pasquali, G., Poggi, A. A., Stefanini, S., Valdrè, R., Bougault, E., Bonnet, B., Borderie, A., Chbihi, J. D., Frankland, D., Gruyer, O., Lopez, N., Le Neindre, M., Pârlog, M. F., Rivet, E., Vient, Rosato, Elio, Spadaccini, Giulio, Vigilante, Mariano, M., Bruno, T., Marchi, L., Morelli, M., Cinausero, M., Degerlier, F., Gramegna, T., Kozik, T., Twaróg, R., Alba, C., Maiolino, D., Santonocito for the FAZIA collaboration, S. Piantelli, G. Casini, P. Maurenzig, A. Olmi, S. Barlini, M. Bini, S. Carboni, G. Pasquali, G. Poggi, A. Stefanini, S. Valdrè, R. Bougault, E. Bonnet, B. Borderie, A. Chbihi, J. Frankland, D. Gruyer, O. Lopez, N. Le Neindre, M. Pârlog, M. Rivet, E. Vient, E. Rosato, G. Spadaccini, M. Vigilante, M. Bruno, T. Marchi, L. Morelli, M. Cinausero, M. Degerlier, F. Gramegna, T. Kozik, T. Twaróg, R. Alba, C. Maiolino, and D. Santonocito
Subjects: NUCLEAR REACTIONS, nuclear collision, High Energy Physics::Lattice, ISOSPIN EFFECTS, multifragmentation, FOS: Physical sciences, ddc:530, staggering, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: 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 rapidly decrease with increasing size of the fragments. Moreover the staggering in N is definitely larger than the one in Z. Similar general features are qualitatively reproduced by the GEMINI code. Concerning the comparison of the two systems, the staggering in N is in general rather similar, being slightly larger only for the lightest fragments produced in the n-rich system. In contrast the staggering in Z, although smaller than that in N, is sizably larger for the n-poor system with respect to the n-rich one., 6 pages, 5 figures, Revtex format
Published: 2013

14. New isospin e ffects in central heavy-ion collisions at Fermi energies

Author: P. Napolitani, René Roy, G. Ademard, Paola Marini, M. Pârlog, J.D. Frankland, Maria Colonna, M.F. Rivet, N. Le Neindre, L. Manduci, F. Gagnon-Moisan, E. Legouée, Mariano Vigilante, E. Galichet, D. Guinet, B. Borderie, Elio Rosato, Eric Bonnet, M. Boisjoli, A. Chbihi, Piotr Pawłowski, P. Lautesse, R. Bougault, 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), Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), 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), 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), 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), Ecole des applications militaires de l'énergie atomique (EAMEA), INDRA, 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), 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)-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), F., Gagnon Moisan, E., Galichet, M. F., Rivet, B., Borderie, M., Colonna, R., Roy, P., Pawloski, E., Bonnet, N., Le Neindre, Raduta, A. d. R., R., Bougault, A., Chbihi, J. D., Frankland, D., Guinet, P., Lautesse, J., Lukasik, P., Marini, M., Parlog, Rosato, Elio, Spadaccini, Giulio, Vigilante, Mariano, and J. P., Wieleczko
Subjects: Nuclear and High Energy Physics, multifragmentation, Nuclear Theory, chemistry.chemical_element, FOS: Physical sciences, Central nuclear collisions between Xe and Sn, symmetry term of the nuclear EOS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 01 natural sciences, 25.70.Pq, 24.10.-i, Nuclear physics, Xenon, 0103 physical sciences, isospin effects, Multiplicity (chemistry), Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Isotope, 010308 nuclear & particles physics, Charge (physics), Nuclear reaction, Symmetry (physics), chemistry, Isospin, Fermi Gamma-ray Space Telescope
Abstract: 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 the neutron-richness of the total system. Comparisons with a stochastic transport model allow to attribute the multiplicity increase to the multifragmentation stage, before secondary decay. The total charge bound in fragments is proposed as an alternate variable to quantify preequilibrium emission and to investigate symmetry energy e ffects., Comment: 10 pages. 6 figures. Submitted to Physical Review C
Published: 2012
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15. Experimental determination of the quasi-projectile mass with measured neutrons

Author: Aldo Bonasera, L. W. May, Zachary Kohley, Lauren Heilborn, G. A. Souliotis, J. Mabiala, Paola Marini, Alan McIntosh, A. Raphelt, G. Bonasera, Sherry Yennello, P. Cammarata, A. Zarrella, Grand Accélérateur National d'Ions Lourds (GANIL), and 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)
Subjects: Nuclear and High Energy Physics, Neutron emission, Astrophysics::High Energy Astrophysical Phenomena, multifragmentation, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Neutron scattering, neutron detection, 01 natural sciences, Neutron time-of-flight scattering, Nuclear physics, 0103 physical sciences, Neutron detection, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Physics, 010308 nuclear & particles physics, Projectile, Isospin physics, Charged particle, Isospin, quasi-projectile mass reconstruction
Abstract: The investigation of the isospin dependence of multifragmentation reactions relies on precise reconstruction of the fragmenting source. The criteria used to assign free emitted neutrons, detected with the TAMU Neutron Ball, to the quasi-projectile source are investigated in the framework of two different simulation codes. Overall and source-specific detection efficiencies for multifragmentation events are found to be model independent. The equivalence of the two different methods used to assign experimentally detected charged particles and neutrons to the emitting source is shown. The method used experimentally to determine quasi-projectile emitted free neutron multiplicity is found to be reasonably accurate and sufficiently precise as to allow for the study of well-defined quasi-projectile sources., Comment: 10 pages, 8 figures. To be submitted to Nucl. Instr. and Meth. A
Published: 2012
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16. INCLUSIVE SYSTEMATICS FOR SI-28+SI-28 REACTIONS BETWEEN 20 AND 35 MEV PER NUCLEON

Subjects: MODEL, MULTIFRAGMENTATION, FUSION, Nuclear Theory, AR-40, HEAVY-ION COLLISIONS, Nuclear Experiment, EMISSION, PHASE-SPACE, FERMI ENERGY, PROJECTILE FRAGMENTATION, MOMENTUM
Abstract: Inclusive velocity spectra of heavy ions produced in the Si-28 + Si-28 reaction at 22, 26, 30, and 35 MeV per nucleon were measured and decomposed into peripheral and central components using an analytical moving-source parametrization. The persistence of incomplete fusion followed by evaporation has been observed over the entire bombarding energy range. Ratios of parallel and perpendicular momentum widths for fusion events show a growth of preequilibrium emission with increasing beam energy. The evaporation-residue data are consistent with a limit of 6 MeV per nucleon excitation energy beyond which conventional evaporation becomes significantly less probable. This limiting value is compatible with what one can expect from the balance between nuclear relaxation times and times for particle evaporation.
Published: 1994

17. Dynamical approach to spectator fragmentation in Au+Au reactions at 35 MeV/A

Author: Rajeev K. Puri and Yogesh K. Vermani
Subjects: Physics, Nuclear Theory, QC1-999, multifragmentation, General Physics and Astronomy, FOS: Physical sciences, heavy-ion collisions, Minimum spanning tree, Quantum molecular dynamics, Molecular physics, Nuclear Theory (nucl-th), Low energy, quantum molecular dynamics (qmd) model, Fragmentation (mass spectrometry), multics-miniball array, Simulated annealing, Incident energy, Nuclear Experiment
Abstract: The characteristics of fragment emission in peripheral $^{197}$Au+$^{197}$Au collisions 35 MeV/A are studied using the two clusterization approaches within framework of \emph{quantum molecular dynamics} model. Our model calculations using \emph{minimum spanning tree} (MST) algorithm and advanced clusterization method namely \emph{simulated annealing clusterization algorithm} (SACA) showed that fragment structure can be realized at an earlier time when spectators contribute significantly toward the fragment production even at such a low incident energy. Comparison of model predictions with experimental data reveals that SACA method can nicely reproduce the fragment charge yields and mean charge of the heaviest fragment. This reflects suitability of SACA method over conventional clusterization techniques to investigate spectator matter fragmentation in low energy domain., 6 pages, 5 figures, accepted
Published: 2010

18. Symmetry energy of fragments produced in multifragmentation

Author: K.-H. Schmidt, V. Henzl, P. Napolitani, Daniela Henzlova, M. V. Ricciardi, A. S. Botvina, 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), 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: Physics, Nuclear and High Energy Physics, Phase transition, Multifragmentation, 010308 nuclear & particles physics, Projectile, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Symmetry (physics), Nuclear physics, 25.70.Mn, 25.70.Pq, 24.10.Pa, Isospin, 0103 physical sciences, Isoscaling, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Energy (signal processing), Symmetry energy
Abstract: Isospin properties of fragments measured in multifragmentation of 136Xe and 124Xe projectiles in mid-peripheral collisions with a lead target at 1 A GeV were studied within the statistical approach describing the liquid-gas nuclear phase transition. By analyzing the isoscaling phenomenon and the mean N-over-Z ratio of the fragments with Z=10-13 we have concluded that the symmetry energy of hot fragments produced in multifragment environment at subnuclear densities at high temperatures decreases in comparison with cold nuclei., 10 pages, 4 figures, background information on http://www-w2k.gsi.de/charms/
Published: 2010

19. Simple observables sensitive to the transition from sequential decay to simultaneous break-up of nuclear systems

Author: F. Gramegna, I. Iori, G. Vannini, E. Fuschini, L. Manduci, P. Buttazzo, Giacomo Vito Margagliotti, A. Moroni, M. D'Agostino, A. Foti, M. L. Fiandri, P. M. Milazzo, M. Bruno, A. Cunsolo, M., Bruno, M., D’Agostino, M. L., Fiandri, E., Fuschini, P. M., Milazzo, A., Cunsolo, A., Foti, F., Gramegna, I., Iori, L., Manduci, A., Moroni, P., Buttazzo, Margagliotti, Giacomo, and G., Vannini
Subjects: Physics, Nuclear reaction, MULTIFRAGMENTATION, Break-Up, Observable, HEAVY-ION INDUCED REACTIONS AND SCATTERING, Nuclear system, COMPLEX FRAGMENT EMISSION, PHASE-TRANSITION, Intermediate energy, Fragmentation (mass spectrometry), Excited state, Atomic physics, Nuclear Experiment
Abstract: The relative velocities and relative angles between massive fragments emitted in heavy-ion nuclear reactions have been studied as a tool to discriminate between two extreme break-up mechanisms in the intermediate energy regime. Considering a chain of sequential decays and a simultaneous break-up of an excited nuclear system, we show that the behaviour of the event distribution in the space of relative velocities and angles depends on the fragmentation mechanism, indicating the possibility of observing the transition from the binary-decay mechanism to the simultaneous cracking of nuclear systems.
Published: 1992

20. Isotopic Dependence of the Nuclear Caloric Curve

Author: The ALADIN2000 Collaboration, Sfienti, C., Adrich, P., Aumann, T., Bacri, C. O., Barczyk, T., Bassini, R., Bianchin, S., Boiano, C., Botvina, A. S., Boudard, A., Brzychczyk, J., Chbihi, A., Cibor, J., Czech, B., De Napoli, M., Ducret, J. -E., Emling, H., Frankland, J. D., Hellstroem, M., Henzlova, D., Imme, G., Iori, I., Johansson, H., Kezzar, K., Lafriakh, A., Fevre, A. Le, Gentil, E. Le, Leifels, Y., Luehning, J., Lukasik, J., Lynch, W. G., Lynen, U., Majka, Z., Mocko, M., Mueller, W. F. J., Mykulyak, A., Orth, H., Otte, A. N., Palit, R., Pawlowski, P., Pullia, A., Raciti, G., Rapisarda, E., Sann, H., Schwarz, C., Simon, H., Suemmerer, K., Trautmann, W., Tsang, M. B., Verde, G., Volant, C., Wallace, M., Weick, H., Wiechula, J., Wieloch, A., Zwieglinski, B., 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), 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), ALADIN, 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), and 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)
Subjects: Physics, Spectrometer, 010308 nuclear & particles physics, Nuclear Theory, multifragmentation, FOS: Physical sciences, General Physics and Astronomy, isotopic composition, freeze-out temperature, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Caloric curve, Nuclear physics, 0103 physical sciences, Coulomb, Physics::Accelerator Physics, Nuclear Experiment (nucl-ex), Atomic physics, 010306 general physics, Nucleon, Nuclear Experiment, Projectile fragmentation, Beam (structure)
Abstract: The A/Z dependence of projectile fragmentation at relativistic energies has been studied with the ALADIN forward spectrometer at SIS. A stable beam of 124Sn and radioactive beams of 124La and 107Sn at 600 MeV per nucleon have been used in order to explore a wide range of isotopic compositions. Chemical freeze-out temperatures are found to be nearly invariant with respect to the A/Z of the produced spectator sources, consistent with predictions for expanded systems. Small Coulomb effects (\Delta T \approx 0.6 MeV) appear for residue production near the onset of multifragmentation., Comment: 11 pages, 3 figures, accepted for publ. in Phys. Rev. Lett
Published: 2009

21. Fragment properties of fragmenting heavy nuclei produced in central and semi-peripheral collisions

Author: R. Roy, D. Guinet, C. Sfienti, J. Łukasik, E. Bonnet, A. Chbihi, D. Mercier, N. Le Neindre, M. Pârlog, J.D. Frankland, R. Dayras, M. Vigilante, B. Zwieglinski, F. Gagnon-Moisan, E. Galichet, J.P. Wieleczko, Aladin Collaborations, M. F. Rivet, P. Lautesse, R. Bougault, B. Borderie, E. Rosato, 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), 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 Recherches sur les lois Fondamentales de l'Univers (IRFU), 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), Institute of Nuclear Physics (IFJ-PAN), Institute of Nuclear Physics, Dipartimento di Scienze Fisiche e Sezione INFN, Istituto Nazionale di Fisica Nucleare (INFN)-Università degli studi di Napoli Federico II, Laboratoire de Physique Nucléaire, Université Laval [Québec] (ULaval), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), INDRA, ALADIN, E., Bonnet, B., Borderie, N., Le Neindre, M. F., Rivet, R., Bougault, A., Chbihi, R., Dayra, J. D., Frankland, E., Galichet, F., Gagnon Moisan, D., Guinet, P., Lautesse, J., Lukasik, D., Mercier, M., Parlog, Rosato, Elio, R., Roy, C., Sfienti, Vigilante, Mariano, J. P., Wielezcko, B., Zwieglinski, 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), 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), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), 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), and Istituto Nazionale di Fisica Nucleare (INFN)-University of Naples Federico II = Università degli studi di Napoli Federico II
Subjects: Nuclear reaction, Nuclear and High Energy Physics, multifragmentation, FOS: Physical sciences, central and semi-peripheral collisions, latent heat, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, fragment partitions, Fragmentation (mass spectrometry), nucleaer physic, 0103 physical sciences, Velocity space, Thermal, Multiplicity (chemistry), Nuclear Experiment (nucl-ex), 010306 general physics, Intermediate energy heavy-ion reactions, Nuclear Experiment, Phase diagram, Physics, 010308 nuclear & particles physics, Charged particle, nucleus-nucleus collision, phase transition, collective energy, Atomic physics, Excitation
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., 23 pages submitted to NPA
Published: 2008

22. Nuclear multifragmentation and phase transition for hot nuclei

Author: M.F. Rivet, B. Borderie, 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), and 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)
Subjects: Nuclear and High Energy Physics, Phase transition, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Nuclear Theory (nucl-th), symbols.namesake, 0103 physical sciences, medicine, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Phase diagram, Physics, Multifragmentation, 010308 nuclear & particles physics, Finite system, Nuclear matter, Physics::History of Physics, Bohr model, medicine.anatomical_structure, symbols, Nucleus
Abstract: This review article is focused on the tremendous progress realized during the last fifteen years in the understanding of multifragmentation and its relationship to the liquid-gas phase diagram of nuclei and nuclear matter. The explosion of the whole nucleus, early predicted by Bohr [N. Bohr, Nature 137 (1936) 351], is a very complex and rich subject which continues to fascinate nuclear physicists as well as theoreticians who extend the thermodynamics of phase transitions to finite systems.
Published: 2008
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23. Signals of bimodality in the fragmentation of Au quasi-projectiles

Author: F. Cannata, G. Vannini, M. Bruno, Francesca Gulminelli, M. D'Agostino, F. Gramegna, 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), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (INFN, Sezione di Bologna), Istituto Nazionale di Fisica Nucleare (INFN), Laboratori Nazionali di Legnaro (LNL), M. Bruno, F. Gulminelli, F. Cannata, M. D’Agostino, F. Gramegna, and G. Vannini
Subjects: Nuclear reaction, Physics, NUCLEAR REACTIONS, Nuclear and High Energy Physics, Phase transition, MULTIFRAGMENTATION, 010308 nuclear & particles physics, Projectile, FOS: Physical sciences, PHASE TRANSITION, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], First order, 01 natural sciences, BIMODAL BEHAVIOR, Bimodality, Fragmentation (mass spectrometry), 0103 physical sciences, Atomic physics, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract: Signals of bimodality have been investigated in experimental data of quasi-projectile decay produced in Au+Au collisions at 35 AMeV. This same data set was already shown to provide several signals characteristic of a first order, liquid-gas-like phase transition. Different event sortings proposed in the recent literature are analyzed. A sudden change in the fragmentation pattern is revealed by the distribution of the charge of the largest fragment, compatible with a bimodal behavior., Comment: 17 pages, 8 figures, submitted to Nuclear Physics A
Published: 2008
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24. 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

25. Correlations and Characterization of Emitting Sources

Author: Giuseppe Verde, R. Ghetti, J. Helgesson, A. Chbihi, Grand Accélérateur National d'Ions Lourds (GANIL), and 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)
Subjects: Nuclear reaction, Heavy-ion collisions, Nuclear and High Energy Physics, Photon, 21.65.+f , 24.10.-i, 24.10.Pa, 25.70.-z, 25.70.Pq, 25.75.Gz, 26.60.+c, FOS: Physical sciences, Radiation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, Fragments internal excitation energy, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, Two-particle correlation functions, Physics, Multifragmentation, Intensity interferometry, Gamma ray, Emitting sources, Charged particle, Particle emission chronology, IMF-IMF correlation functions, Excited state, Atomic physics, Excitation
Abstract: Dynamical and thermal characterizations of excited nuclear systems produced during the collisions between two heavy ions at intermediate incident energies are presented by means of a review of experimental and theoretical work performed in the last two decades. Intensity interferometry, applied to both charged particles (light particles and intermediate mass fragments) and to uncharged radiation (gamma rays and neutrons) has provided relevant information about the space-time properties of nuclear reactions. The volume, lifetime, density and relative chronology of particle emission from decaying nuclear sources has been extensively explored and has provided valuable information about the dynamics of heavy-ion collisions. Similar correlation techniques applied to coincidences between light particles and complex fragments are also presented as a tool to determine the internal excitation energy of excited primary fragments as it appears in secondary-decay phenomena., To appear on Euorpean Physics Journal A as part of the Topical Volume "Dynamics and Thermodynamics with Nuclear Degrees of Freedom"
Published: 2006

26. Fluctuations of fragment observables

Author: Francesca Gulminelli, M. D'Agostino, 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), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (INFN, Sezione di Bologna), Istituto Nazionale di Fisica Nucleare (INFN), F. Gulminelli, and M. D'Agostino
Subjects: Physics, Nuclear and High Energy Physics, Phase transition, Conservation law, MULTIFRAGMENTATION, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 24.10.Pa - 24.60.Ky - 25.70.Pq - 68.35.Rh, FOS: Physical sciences, Observable, FLUCTUATIONS, HEAVY-ION COLLISIONS, Collision, Heat capacity, Ion, EVAPORATION, Fragmentation (mass spectrometry), Coulomb, Statistical physics, Nuclear Experiment (nucl-ex), Nuclear Experiment, FRAGMENTS
Abstract: This contribution presents a review of our present theoretical as well as experimental knowledge of different fluctuation observables relevant to nuclear multifragmentation. The possible connection between the presence of a fluctuation peak and the occurrence of a phase transition or a critical phenomenon is critically analyzed. Many different phenomena can lead both to the creation and to the suppression of a fluctuation peak. In particular, the role of constraints due to conservation laws and to data sorting is shown to be essential. From the experimental point of view, a comparison of the available fragmentation data reveals that there is a good agreement between different data sets of basic fluctuation observables, if the fragmenting source is of comparable size. This compatibility suggests that the fragmentation process is largely independent of the reaction mechanism (central versus peripheral collisions, symmetric versus asymmetric systems, light ions versus heavy ion induced reactions). Configurational energy fluctuations, that may give important information on the heat capacity of the fragmenting system at the freeze out stage, are not fully compatible among different data sets and require further analysis to properly account for Coulomb effects and secondary decays. Some basic theoretical questions, concerning the interplay between the dynamics of the collision and the fragmentation process, and the cluster definition in dense and hot media, are still open and are addressed at the end of the paper. A comparison with realistic models and/or a quantitative analysis of the fluctuation properties will be needed to clarify in the next future the nature of the transition observed from compound nucleus evaporation to multi-fragment production., Comment: Contribution to WCI (World Consensus Initiative) Book " "Dynamics and Thermodynamics with Nuclear Degrees of Freedom", to appear on Euorpean Physics Journal A as part of the Topical Volume. 9 pages, 12 figures
Published: 2006

27. Isotopic effects in multifragmentation and the nuclear equation of state

Author: W. Trautmann, G. Auger, M. L. Begemann Blaich, N. Bellaize, R. Bittiger, F. Bocage, B. Borderie, R. Bougault, B. Bouriquet, J. L. Charvet, A. Chbihi, R. Dayras, D. Durand, J. D. Frankland, E. Galichet, D. Gourio, D. Guinet, S. Hudan, P. Lautesse, F. Lavaud, A. Le Fèvre, R. Legrain, O. Lopez, J. Łukasik, U. Lynen, W. F. J. Müller, L. Nalpas, H. Orth, E. Plagnol, A. Saija, C. Schwarz, C. Sfienti, B. Tamain, A. Trzciński, K. Turzó, E. Vient, C. Volant, B. Zwiegliński, ROSATO, ELIO, VIGILANTE, MARIANO, W., Trautmann, 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, A., Le Fèvre, R., Legrain, O., Lopez, J., Łukasik, U., Lynen, W. F. J., Müller, L., Nalpa, H., Orth, E., Plagnol, Rosato, Elio, A., Saija, C., Schwarz, C., Sfienti, B., Tamain, A., Trzciński, K., Turzó, E., Vient, Vigilante, Mariano, C., Volant, and B., Zwiegliński
Subjects: Physics, Nuclear and High Energy Physics, Isotope, Spectrometer, Projectile, multifragmentation, Nuclear Theory, FOS: Physical sciences, Observable, Breakup, Nuclear physics, Fragmentation (mass spectrometry), phase transition, isospin effect, Atomic physics, Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment, Scaling
Abstract: Isotopic effects in spectator fragmentations following heavy-ion collisions at relativistic energies are investigated using data from recent exclusive experiments with SIS beams at GSI. Reactions of 12C on 112,124Sn at incident energies 300 and 600 MeV per nucleon were studied with the INDRA multidetector while the fragmentation of stable 124Sn and radioactive 107Sn and 124La projectiles was studied with the ALADIN spectrometer. The global characteristics of the reactions are very similar. This includes the rise and fall of fragment production and deduced observables as, e.g., the breakup temperature obtained from double ratios of isotope yields. The mass distributions depend strongly on the neutron-to-proton ratio of the decaying system, as expected for a simultaneous statistical breakup. The ratios of light-isotope yields from neutron-rich and neutron-poor systems follow the law of isoscaling. The deduced scaling parameters decrease strongly with increasing centrality to values smaller than 50% of those obtained for the peripheral event groups. This is not compensated by an equivalent rise of the breakup temperatures which suggests a reduction of the symmetry term required in a liquid-drop description of the fragments at freeze-out., Comment: 10 pages, 5 figures, invited talk at IX International Conference on Nucleus Nucleus Collisions, Rio de Janeiro, Brazil August 28 - September 1, 2006
Published: 2006
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28. Constraints on the time-scale of nuclear breakup from thermal hard-photon emission

Author: R.W. Ostendorf, S. Schadmand, D. Baiborodin, N. Yahlali, R. Ortega, V. Wagner, David D'Enterria, F. Fernández, H. Delagrange, P. Tlusty, Y. Schutz, J. S. Díaz, R. Turrisi, Herbert Löhner, T. Matulewicz, G. Martınez, H. W. Wilschut, Laboratoire SUBATECH Nantes (SUBATECH), 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), 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), 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 KVI - Center for Advanced Radiation Technology
Subjects: Nuclear and High Energy Physics, Spinodal, Hadron, Nuclear Theory, FOS: Physical sciences, HEAVY-ION COLLISIONS, MASS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 7. Clean energy, 01 natural sciences, GAS PHASE-TRANSITION, FERMI ENERGY, Nuclear physics, 0103 physical sciences, Nuclear fusion, ddc:530, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, GIANT-DIPOLE RESONANCE, MULTIFRAGMENTATION, HOT NUCLEI, 010308 nuclear & particles physics, BREMSSTRAHLUNG PHOTONS, 21.65.+f - 25.70.-z - 13.75.Cs - 64.70.Dv, Breakup, Deuterium, Excited state, COLLECTIVE MOTION, IMPACT PARAMETER, Atomic physics, Impact parameter
Abstract: Measured hard photon multiplicities from second-chance nucleon-nucleon collisions are used in combination with a kinetic thermal model, to estimate the break-up times of excited nuclear systems produced in nucleus-nucleus reactions at intermediate energies. The obtained nuclear break-up time for the $^{129}${Xe} + $^{nat}${Sn} reaction at 50{\it A} MeV is $\Delta$$\tau$ $\approx$ 100 -- 300 fm/$c$ for all reaction centralities. The lifetime of the radiating sources produced in seven other different heavy-ion reactions studied by the TAPS experiment are consistent with $\Delta$$\tau$ $\approx$ 100 fm/$c$, such relatively long thermal photon emission times do not support the interpretation of nuclear breakup as due to a fast spinodal process for the heavy nuclear systems studied., Comment: 11 pages, 9 figures, submitted to EPJA
Published: 2006

29. 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., Botvina, A. S., 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), 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), 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), A., LE FEVRE, 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, G., Imm, P., Lautesse, F., Lavaud, R., Legrain, O., Lopez, J., Lukasik, U., Lynen, W. F. J., Muller, L., Nalpa, H., Orth, E., Plagnol, G., Raciti, Rosato, Elio, A., Saija, C., Schwarz, W., Seidel, C., Sfienti, B., Tamain, W., Trauttmann, A., Trzcinski, K., Turzo, E., Vient, Vigilante, Mariano, C., Volant, and B. ZWIEGLINSKI E. A. S., Botvina
Subjects: Scaling law, Photon, multifragmentation, Nuclear Theory, FOS: Physical sciences, General Physics and Astronomy, isoscaling, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Fragmentation (mass spectrometry), 0103 physical sciences, Nuclear Experiment (nucl-ex), Exponential law, 010306 general physics, Nuclear Experiment, Scaling, thermalization, Physics, 010308 nuclear & particles physics, Excited state, Atomic number, Atomic physics, Nucleon
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, Comment: 4 pages, 4 figures
Published: 2005

30. How to calibrate the time scale of emission of intermediate mass fragments

Author: Wilczynski, J, DE FILIPPO, E, Pagano, A, Amorini, F, Anzalone, A, Auditore, Lucrezia, Baran, V, Berceanu, I, Blicharska, J, Brzychczyk, J, Bonasera, A, Borderie, B, Bogault, R, Bruno, M, Cardella, G, Cavallaro, S, Chatterjee, Mb, Chbihi, A, Cibor, J, Colonna, M, D'Agostino, M, Dayras, R, DI TORO, M, Frankland, J, Galichet, E, Gawlikowicz, W, Geraci, E, Giustolisi, F, Grzeszczuk, A, Guazzoni, P, Guinet, D, IACONO MANNO, M, Kowalski, S, LA GUIDARA, E, Lanzano, G, Lanzalone, G, LE NEINDRE, N, Li, S, Maiolino, C, Majka, Z, Papa, M, Petrovici, M, Piasecki, E, Pirrone, S, Planeta, R, Politi, G, Pop, A, Porto, F, Rivet, Mf, Rosato, E, Rizzo, F, Russo, S, Russotto, P, Sassi, M, Schmidt, K, SIWEK WILCZYNSKA, K, Skwira, I, Sperduto, Ml, Swiderski, L, Trifiro', Antonio, Trimarchi, Marina, Vannini, G, Vigilante, M, Wieleczko, Jp, Wu, H, Xiao, Z, 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), 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), 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), CHIMERA, 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), J. WILCZYNSKI, E. DE FILIPPO, A. PAGANO, F. AMORINI, A. ANZALONE, L. AUDITORE, V. BARAN, I. BERCEANU, J. BLICHARSKA, J. BRZYCHCZYK, A. BONASERA, B. BORDERIE, R. BOGAULT, M. BRUNO, G. CARDELLA, S. CAVALLARO, M.B. CHATTERJEE, A. CHBIHI, J. CIBOR, M. COLONNA, M. D'AGOSTINO, R. DAYRAS, M. DI TORO, J. FRANKLAND, E. GALICHET, W. GAWLIKOWICZ, E. GERACI, F. GIUSTOLISI, A. GRZESZCZUK, P. GUAZZONI, D. GUINET, M. IACONO-MANNO, S. KOWALSKI, E. LA GUIDARA, G. LANZANO, G. LANZALONE, N. LE NEINDRE, S. LI, C. MAIOLINO, Z. MAJKA, M. PAPA, M. PETROVICI, E. PIASECKI, S. PIRRONE, R. P LANETA, G. POLITI, A. POP, F. PORTO, M.F. RIVET, E. ROSATO, F. RIZZO, S. RUSSO, P. RUSSOTTO, M. SASSI, K. SCHMIDT, K. SIWEK-WILCZYNSKA, I. SKWIRA, M.L. SPERDUTO, L. SWIDERSKI, A. TRIFIRO', M. TRIMARCHI, G. VANNINI, M. VIGILANTE, J.P. WIELECZKO, H. WU, Z. XIAO, L. ZETTA, W. ZIPPER, J., Wilczynski, E., De Filippo, A., Pagano, F., Amorini, A., Anzalone, L., Auditore, V., Baran, I., Berceanu, J., Blicharska, J., Brzychczyk, A., Bonasera, B., Borderie, R., Bougault, M., Bruno, G., Cardella, S., Cavallaro, M. B., Chatterjee, A., Chbihi, J., Cibor, M., Colonna, M., D'Agostino, R., Dayra, M., Di Toro, J. D., Frankland, E., Galichet, W., Gawlikowicz, E., Geraci, F., Giustolisi, A., Grzeszczuk, P., Guazzoni, D., Guinet, M., Iacono Manno, S., Kowalski, E., La Guidara, G., Lanzanò, G., Lanzalone, N., Le Neindre, S., Li, C., Maiolino, Z., Majka, M., Papa, M., Petrovici, E., Piasecki, S., Pirrone, R., Planeta, G., Politi, A., Pop, F., Porto, M. F., Rivet, F., Rizzo, Rosato, Elio, S., Russo, P., Russotto, M., Sassi, K., Schmidt, K., Siwek Wilczynska, I., Skwira, M. L., Sperduto, L., Swiderski, A., Trifirò, M., Trimarchi, G., Vannini, Vigilante, Mariano, J. P., Wieleczko, H., Wu, Z., Xiao, L., Zetta, and W., Zipper
Subjects: COLLISIONS, REAZIONI SEMI-PERIFERICHE, Nuclear and High Energy Physics, Scale (ratio), multifragmentation, Nuclear Theory, General Physics and Astronomy, Time sequence, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, 0103 physical sciences, 010306 general physics, Nuclear Experiment, emission time scale, REAZIONI NUCLEARI FRA IONI PESANTI, Physics, 010308 nuclear & particles physics, Settore FIS/01 - Fisica Sperimentale, FISSION, nucleus-nucleus collision, TEMPI DI EMISSIONE DEI FRAMMENTI, PRODUZIONE DI FRAMMENTI, CORRELAZIONI IN VELOCITA' RELATIVA, Nucleon
Abstract: In order to obtain information on the time sequence and time scale of the production of intermediate mass fragments (IMF) in nucleus-nucleus collisions at intermediate energies it is proposed to analyze correlations between relative velocities of IMF's with respect to projectile-like fragments (PLF) and target-like fragments (TLF). Experimental data on the production of IMF's in the 124Sn+64Ni reaction, taken with the CHIMERA multidetector array at 35 MeV/nucleon, have been analyzed with the proposed method. Read More: http://www.worldscientific.com/doi/abs/10.1142/S0218301305003119?prevSearch=%5BContrib%3A+rosato%5D&searchHistoryKey=
Published: 2004

31. Origin of Fragments in Multifragmentation Reactions

Author: J. Aichelin, K. Zbiri, Laboratoire SUBATECH Nantes (SUBATECH), and 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)
Subjects: Physics, Nuclear and High Energy Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Projectile, Hadron, multifragmentation, General Physics and Astronomy, 01 natural sciences, Quantum molecular dynamics, Spectral line, Nuclear physics, Phase space, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: Using the quantum molecular dynamics approach we have started to analyze the results of the recent INDRA experiments at GSI experiments. For the first time we could identify a midrapidity source in which fragments are formed from a almost identical fraction of projectile and target nucleons. In smaller systems we have not found this source. Nevertheless the fragment spectra at small and large angles are completely determined by the dynamics. We discuss how fragments are formed in the different regions of phase space and what they tell us about the reaction mechanism.
Published: 2004

32. Droplet formation in expanding nuclear matter: a system-size dependent study

Author: Reisdorf, W., Rami, E., Schauenburg, B. de, Leifels, Y., Alard, J.P., Andronic, A., Barret, V., Basrak, Zoran, Bastid, N., Benabderrahmane, M.L., Čaplar, Roman, Crochet, P., Dupieux, P., Dželalija, Mile, Fodor, Z., Gobbi, A., Grishkin, Y., Hartmann, O.N., Herrmann, N., Hildenbrand, K.D., Hong, B., Kecskemeti, J., Kim, Y.J., Kirejczyk, M., Koczon, P., Korolija, Milorad, Kotte, R., Kress, T., Lebedev, A., Lopez, X., Merschmeyer, M., Mosner, J., Neubert, W., Pelte, D., Petrovici, M., Schuttauf, A., Seres, Z., Sikora, B., Sim, K.S., Siwek-Wilczynska, K., Smolyankin, V., Stockmeier, M., Stoicea, G., Tyminski, Z., Wagner, P., Wisniewski, K., Wohlfarth, D., Xiao, Z.G., Yushmanov, I., and Zhilin, A.
Subjects: heavy-ion collisions, phase transition, dynamics, multifragmentation, Nuclear Theory, Nuclear Experiment
Abstract: Cluster production is investigated in central collisions of Ca + Ca, Ni + Ni, ^96Zr + ^96Zr, ^96Ru + ^96Ru, Xe + CsI and An + An reactions at 0.4 A GeV incident energy. We find that the multiplicity of clusters with charge Z greater than or equal to 3 grows quadratically with the system's total charge and is associated with a midrapidity source with increasing transverse velocity fluctuations. When reduced to the same number of available charges, an increase of cluster production by about a factor of 5.5 is observed in the midrapidity region between the lightest system (Ca + Ca) and the heaviest one (An + An). The results, as well as simulations using quantum molecular dynamics, suggest a collision process where droplets, i.e., nucleon clusters, are created in an expanding, gradually cooling, nucleon gas. Within this picture, expansion dynamics, collective radial flow and cluster formation are closely linked as a result of the combined action of nucleon-nucleon scatterings and the mean fields.
Published: 2004

33. Cnstructing the phase diagram of finite neutral nuclear matter

Author: Luciano G. Moretto, R. P. Scharenberg, Salvatore Costa, H. Sann, F. S. Bieser, H. S. Matis, James B. Elliott, Wolfgang Müller, K.L. Wolf, H. G. Ritter, Cristina Tuve, J. A. Hauger, P. Warren, M. Justice, Y. Choi, Renato Potenza, C. P. McParland, E. L. Hjort, G.V. Russo, J. O. Rasmussen, Z. Caccia, J. L. Chance, V. Lindenstruth, M. L. Tincknell, M. D. Partlan, D. Cebra, Antonio Insolia, A. S. Hirsch, N. T. Porile, M. A. McMahan, F. P. Brady, J. Romanski, G. J. Wozniak, M. L. Gilkes, A. Scott, T. J. M. Symons, G. Rai, M. A. Lisa, Sebastiano Albergo, T. Wienold, D. L. Olson, B. K. Srivastava, J. L. Romero, A. D. Chacon, L. W. Phair, Y. Shao, D. Keane, H. H. Wieman, S. Wang, and J. C. Kintner
Subjects: Physics, Nuclear and High Energy Physics, Quantum mechanics, small percolation lattices, fishers droplet model, critical exponents, critical-behavior, hot nuclei, multifragmentation, transition, liquid, reducibility, energy, Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, Humanities
Abstract: The fragment yields from the multifragmentation of gold, lanthanum and krypton nuclei obtained by the EOS Collaboration are examined in terms of Fisher's droplet formalism modifed to account for Coulomb energy. The critical exponents sigma and tau and the surface energy coefficient c0 are obtained. Estimates are made of the pressure-temperature and temperature-density coexistence curves of finite neutral nuclear matter as well as the location of the critical point., Comment: 14 pages, 13 figures, 6 tables, submitted to Phys. Rev. C
Published: 2002
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34. HCl-induced ionization and fragmentation of fullerenes and organic molecules

Author: Schlatholter, T., Hadjar, O., Matt, S., Ronnie Hoekstra, Morgenstern, R., and Research unit Astroparticle Physics
Subjects: HIGHLY-CHARGED IONS, ENERGY, ATOMS, C-60 FRAGMENTATION, MULTIFRAGMENTATION, DEPENDENCE, EXCITATION, Physics::Atomic and Molecular Clusters, MULTIPLICITY, ELECTRON-CAPTURE, SLOW COLLISIONS, Nuclear Experiment
Abstract: The interaction of multiply charged ions with fullerenes is governed by electron capture as well as nuclear and electronic stopping, The fullerene excitation due to electronic stopping leads mainly to direct ionization and multifragmentation. Our experiments show that the according patterns in the fragmentation spectra can serve as fingerprints for the electronic stopping. A quantitative analysis of the cross sections for ionization and multifragmentation reveals the characteristic linearity in the projectile velocity v as well as an oscillatory dependence on the projectile atomic number Z. The pi -electron dominated electronic structure of fullerenes has some similarities to that of biomolecular species. Qualitatively similar dynamics are therefore expected to occur in HCI collisions with biomolecules. First experimental results indeed indicate a strong dependence of the fragmentation pattern on projectile charge state and velocity.
Published: 2001

35. Breakup Density in Spectator Fragmentation

Author: S. Fritz, C. Schwarz, R. Bassini, M. Begemann-Blaich, S.J. Gaff-Ejakov, D. Gourio, C. Groß, G. Immé, I. Iori, U. Kleinevoß, G.J. Kunde, W.D. Kunze, U. Lynen, V. Maddalena, M. Mahi, T. Möhlenkamp, A. Moroni, W.F.J. Müller, C. Nociforo, B. Ocker, T. Odeh, F. Petruzzelli, J. Pochodzalla, G. Raciti, G. Riccobene, F.P. Romano, A. Saija, M. Schnittker, A. Schüttauf, W. Seidel, V. Serfling, C. Sfienti, W. Trautmann, A. Trzcinski, G. Verde, A. Wörner, Hongfei Xi, and B. Zwieglinski
Subjects: Physics, Nuclear and High Energy Physics, Nuclear Theory, FOS: Physical sciences, Alpha particle, Breakup, Nuclear physics, INTERMEDIATE-MASS FRAGMENTS, HEAVY-ION COLLISIONS, GAS PHASE-TRANSITION, COLLECTIVE FLOW, MULTIFRAGMENTATION, ENERGIES, NUCLEI, INTERFEROMETRY, AU-197, Deuterium, Fragmentation (mass spectrometry), Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment
Abstract: Proton-proton correlations and correlations of protons, deuterons and tritons with alpha particles from spectator decays following 197Au + 197Au collisions at 1000 MeV per nucleon have been measured with two highly efficient detector hodoscopes. The constructed correlation functions, interpreted within the approximation of a simultaneous volume decay, indicate a moderate expansion and low breakup densities, similar to assumptions made in statistical multifragmentation models. PACS numbers: 25.70.Pq, 21.65.+f, 25.70.Mn, 25.75.Gz, 11 pages, LaTeX with 3 included figures; Also available from http://www-kp3.gsi.de/www/kp3/aladin_publications.html
Published: 1999

36. Thermodynamical features of multifragmentation in peripheral Au + Au Collisions at 35 A.MeV

Author: Giacomo Vito Margagliotti, Francesca Gulminelli, A. Moroni, N. Le Neindre, A. S. Botvina, M. D'Agostino, Aldo Bonasera, I. Iori, P. Desesquelles, R. Bougault, G. Vannini, M. Bruno, A. Pagano, E. Geraci, I. N. Mishustin, J.P. Bondorf, M., D'Agostino, A. S., Botvina, M., Bruno, A., Bonasera, J. P., Bondorf, R., Bougault, P., Désesquelle, E., Geraci, F., Gulminelli, I., Iori, N., LE NEINDRE, Margagliotti, Giacomo, I. N., Mishustin, A., Moroni, A., Pagano, and G., Vannini
Subjects: Physics, Nuclear and High Energy Physics, Phase transition, Multifragmentation, Thermal properties, Charge density, FOS: Physical sciences, Calorimetry, Rest frame, Heat capacity, Molecular physics, Heavy ions, Equilibration, Statistical models, Excited state, Nuclear Experiment (nucl-ex), Nuclear Experiment, Critical exponent, Excitation
Abstract: The distribution of fragments produced in events involving the multifragmentation of excited sources is studied for peripheral Au + Au reactions at 35 A.MeV. The Quasi-Projectile has been reconstructed from its de-excitation products. An isotropic emission in its rest frame has been observed, indicating that an equilibrated system has been formed. The excitation energy of the Quasi-Projectile has been determined via calorimetry. A new event by event effective thermometer is proposed based on the energy balance. A peak in the energy fluctuations is observed related to the heat capacity, suggesting that the system undergoes a liquid-gas type phase transition at an excitation energy about 5 A.MeV and a temperature 4 - 6 MeV, dependent on the freeze-out hypothesis. By analyzing different regions of the Campi-plot, the events associated with the liquid and gas phases as well as the critical region are thermodynamically characterized. The critical exponents, tau, beta,gamma, extracted from the high moments of the charge distribution are consistent with a liquid-gas type phase transition., Comment: 44 pages, 16 Postscript figures, Fig14_nucl-ex.eps in colors, to be published in Nucl.Phys.A (1999)
Published: 1999
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37. Temperatures of Exploding Nuclei

Author: V. Serfling, C.Schwarz, R.Bassini, M.Begemann-Blaich, S.Fritz, S.J.Gaff, C.Groß, G.Immè, I.Iori, U.Kleinevoß, G.J.Kunde, W.D.Kunze, U.Lynen, V.Maddalena, M.Mahi, T.Mòhlenkarnp, A.Moroni, W.F.J.Müller, C.Nociforo, B.Ocker, T.Odeh, F.Petruzzelli, J.Pochodzalla, G.Raciti, G.Riccobene, F.P.Romano, Th.Rubehn, A.Saija, M.Schnittker, A.Schüttauf, W.Seidel, C.Sfienti, W.Trautmann, A.Trzcinski, G.Verde, A.Wörner, Hongfei Xi, and B.Zwieglinski
Subjects: Physics, Hydrogen, Nuclear Theory, General Physics and Astronomy, chemistry.chemical_element, FOS: Physical sciences, Internal temperature, chemistry, Yield (chemistry), Lithium, Atomic physics, Nuclear Experiment (nucl-ex), Adiabatic process, Nuclear Experiment, HEAVY-ION COLLISIONS, AR-40+AU-197 REACTIONS, EMISSION TEMPERATURES, MOLECULAR-DYNAMICS, MULTIFRAGMENTATION, MATTER, FRAGMENTS, SYSTEM, BLAST, WAVE, Helium, Energy (signal processing)
Abstract: Breakup temperatures in central collisions of 197Au + 197Au at bombarding energies E/A = 50 to 200 MeV were determined with two methods. Isotope temperatures, deduced from double ratios of hydrogen, helium, and lithium isotopic yields, increase monotonically with bombarding energy from 5 MeV to 12 MeV, in qualitative agreement with a scenario of chemical freeze-out after adiabatic expansion. Excited-state temperatures, derived from yield ratios of states in 4He, 5Li, 6Li, and 8Be, are about 5 MeV, independent of the projectile energy, and seem to reflect the internal temperature of fragments at their final separation from the system. PACS numbers: 25.70.Mn, 25.70.Pq, 25.75.-q, Comment: 10 pages, RevTeX with 4 included figures; Also available from http://www-kp3.gsi.de/www/kp3/aladin_publications.html
Published: 1998
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38. Statistical multifragmentation in central Au + Au collisions at 35-MeV/u

Author: I. Iori, G. Vannini, Igor Mishustin, T. Glasmacher, F. Petruzzelli, L. Celano, A. Ferrero, M. L. Fiandri, A. Moroni, Nicola Colonna, Giacomo Vito Margagliotti, Gerd Joachim Kunde, L. Manduci, C. Williams, Graham F. Peaslee, C. K. Gelbke, L. Phair, C. P. Montoya, M. A. Lisa, M. J. Huang, Cornelius Schwarz, P. F. Mastinu, D. Horn, J. D. Dinius, P. M. Milazzo, W. G. Lynch, M. Bruno, W. C. Hsi, A. Botvina, M. B. Tsang, Rinaldo Rui, D. R. Bowman, D. O. Handzy, M. D'Agostino, F. Gramegna, D'Agostino, M. a, Botvina, A. S. b, Milazzo, P. M., Bruno, M. a, Kunde, G. J. d, Bowman, D. R. e, Celano, L. f, Colonna, N. f, Dinius, J. D. d, Ferrero, A. g, Fiandri, M. L. a, Gelbke, C. K. d, Glasmacher, T. d, Gramegna, F. h, Handzy, D. O. d, Horn, D. e, W., C. Hsid, M., Huangd, Iori, I. g, Lisa, M. A. d, Lynch, W. G. d, Manduci, L. a, Margagliotti, Giacomo, Mastinu, P. F. a, Mishustin, I. N. i, Montoya, C. P. d, Moroni, A. g, Peaslee, G. F. d, Petruzzelli, F. g, Phair, L. d, Rui, Rinaldo, Schwarz, C. d, M., B. Tsangd, Vannini, G. c, and Williams, C.
Subjects: Physics, Nuclear and High Energy Physics, Nuclear Theory, multifragmentation, FOS: Physical sciences, Charge (physics), Breakup, Heavy ions, Nuclear physics, Nuclear Experiment (nucl-ex), Nuclear Experiment, Heavy ion
Abstract: Multifragment disintegrations, measured for central Au + Au collisions at E/A = 35 MeV, are analyzed with the Statistical Multifragmentation Model. Charge distributions, mean fragment energies, and two-fragment correlation functions are well reproduced by the statistical breakup of a large, diluted and thermalized system slightly above the multifragmentation threshold., Latex file, 8 pages + 4 postscript figures available upon request from Dagostino@axpbo4.bo.infn.it
Published: 1996

39. Multifragment emission times in Xe induced reactions

Author: Rinaldo Rui, Betty Tsang, R. Scardaoni, G. Vannini, W. G. Lynch, L. Phair, Nicola Colonna, D. Horn, M. L. Fiandri, I. Iori, F. Gramegna, P. Buttazzo, Wen Chien Hsi, C. Schwarz, F. Petruzzelli, K. Gelbke, Graham F. Peaslee, M. J. Huang, C. Williams, Giacomo Vito Margagliotti, T. Glasmacher, C. P. Montoya, P. M. Milazzo, M. Bruno, M. A. Lisa, A. Moroni, P. F. Mastinu, D. O. Handzy, M. D'Agostino, A. Ferrero, J. D. Dinius, L. Celano, D. R. Bowman, A., Moroni, D. R., Bowman, M., Bruno, P., Buttazzo, L., Celano, N., Colonna, M., D'Agostino, J. D., Diniu, A., Ferrero, M. L., Fiandri, K., Gelbke, T., Glasmacher, F., Gramegna, D. O., Handzy, D., Horn, Wen Chien, Hsi, M., Huang, I., Iori, M., Lisa, W. G., Lynch, Margagliotti, Giacomo, P. F., Mastinu, P. M., Milazzo, C., Montoya, G. F., Peaslee, L., Phair, F., Petruzzelli, Rui, Rinaldo, R., Scardaoni, C., Schwarz, B., Tsang, G., Vannini, and C., Williams
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, MULTIFRAGMENTATION, Astrophysics::High Energy Astrophysical Phenomena, Atomic physics, Nuclear Experiment
Abstract: Multifragment emission is studied in 129 Xe + nat Cu reactions. The emission process for central collisions occurs on a time scale of ≈ 200 fm/c at 30 MeV/n. Intermediate-mass-fragment yields, velocity correlation functions and emission velocities of Z=6 fragments are compared with predictions of statistical decay models.
Published: 1995

40. INCLUSIVE SYSTEMATICS FOR SI-28+SI-28 REACTIONS BETWEEN 20 AND 35 MEV PER NUCLEON

Author: BOX, PF, GRIFFIOEN, KA, DECOWSKI, P, BOOTSMA, T, GIERLIK, E, VANNIEUWENHUIZEN, GJ, TWENHOFEL, C, KAMERMANS, R, WILSCHUT, HW, GIORNI, A, MORAND, C, DEMEYER, A, GUINET, D, and KVI - Center for Advanced Radiation Technology
Subjects: MODEL, MULTIFRAGMENTATION, FUSION, Nuclear Theory, AR-40, HEAVY-ION COLLISIONS, Nuclear Experiment, EMISSION, PHASE-SPACE, FERMI ENERGY, PROJECTILE FRAGMENTATION, MOMENTUM
Abstract: Inclusive velocity spectra of heavy ions produced in the Si-28 + Si-28 reaction at 22, 26, 30, and 35 MeV per nucleon were measured and decomposed into peripheral and central components using an analytical moving-source parametrization. The persistence of incomplete fusion followed by evaporation has been observed over the entire bombarding energy range. Ratios of parallel and perpendicular momentum widths for fusion events show a growth of preequilibrium emission with increasing beam energy. The evaporation-residue data are consistent with a limit of 6 MeV per nucleon excitation energy beyond which conventional evaporation becomes significantly less probable. This limiting value is compatible with what one can expect from the balance between nuclear relaxation times and times for particle evaporation.
Published: 1994

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