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12 results on '"Mykulyak, A."'

1. Statistical properties of shear deformation of granular media and analogies with natural seismic processes

Author

S. V. Mykulyak, V. O. Polyakovskyi, and S. I. Skurativskyi

Subjects
Similarity (geometry), Deformation (mechanics), FOS: Physical sciences, Mechanics, 010502 geochemistry & geophysics, 01 natural sciences, Natural (archaeology), Self-organized criticality, Physics::Geophysics, Geophysics (physics.geo-ph), Physics - Geophysics, Geophysics, Shear (geology), Critical frequency, Geochemistry and Petrology, Scaling, Aftershock, Geology, 0105 earth and related environmental sciences
Abstract

In this paper, the process of shear deformation of the medium formed by the cubic grains is investigated experimentally. It is demonstrated that the deformation process is intermittent and accompanied by the radiation of acoustic perturbations. These perturbations obey statistical laws that are inherent in natural seismic processes: the frequency-energy scaling relation (the Gutenberg-Richter law) and the generalized Omori law for temporal decay of aftershocks. The weak perturbations influence on the process of shear deformation is studied for the mono-dispersed medium. During the granular medium stimulation by weak periodic signals, the existence of a critical frequency providing the smallest number of critical events in the granular medium is identified. We also developed the algorithm providing smaller stresses inside the granular massif by means of external perturbations during shear deformation. Taking into account the statistical similarity between shear and seismic processes, these results open prospects for the ability to affect the natural seismic processes., Comment: 15 pages, 9 figures

Published
2018
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2. 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
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3. Gross Properties and Isotopic Phenomena in Spectator Fragmentation

Author

B. Czech, I. Iori, E. Le Gentil, C. Volant, Y. Leifels, Håkan T Johansson, A. S. Botvina, W. F. J. Müller, J. Łukasik, J.-E. Ducret, C. Sfienti, E. Rapisarda, J.D. Frankland, Margareta Hellström, H. Sann, W. Trautmann, K. Kezzar, U. Lynen, C.O. Bacri, R. Bassini, H. Weick, Cornelius Schwarz, J. Lühning, W. G. Lynch, H. Orth, Z. Majka, H. Simon, D. Henzlova, M. S. Wallace, P. Adrich, K. Sümmerer, M. Mocko, J. Brzychczyk, A. Chbihi, S. Bianchin, A. Le Fèvre, H. Emling, Thomas Aumann, G. Imme, T. Barczyk, A. Mykulyak, B. Zwieglinski, Piotr Pawłowski, A. Boudard, C. Boiano, J. Wiechula, J. Cibor, A.N. Otte, M. De Napoli, R. Palit, G. Raciti, A. Lafriakh, Alberto Pullia, A. Wieloch, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Istituto Nazionale di Fisica Nucleare, Sezione di Catania (INFN), Università degli studi di Catania [Catania], 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), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (INFN), Istituto Nazionale di Fisica Nucleare (INFN), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), 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), Bertulani C.A., Gomes P.R.S., HusseinM.S., Szanto de ToledoA., ALADIN, Università degli studi di Catania = University of Catania (Unict), 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, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Projectile, media_common.quotation_subject, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Asymmetry, Nuclear physics, Fragmentation (mass spectrometry), Criticality, 0103 physical sciences, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, 010306 general physics, ComputingMilieux_MISCELLANEOUS, media_common
Abstract

A systematic study of isotopic effects in the break-up of projectile spectators at relativistic energies has been performed with the ALADiN spectrometer at the GSI laboratory. Searching for signals of criticality in the fragment production we have applied the model independent universal fluctuations theory already proposed to track criticality signals in multifragmentation to our data. The fluctuation of the largest fragment charge and of the asymmetry of the two and three largest fragments and their bimodal distribution have also been analysed., Comment: 6 pages, 4 figures, IX International Conference on Nucleus-Nucleus Collisions, Rio de Janeiro, Brazil, August 28 - September 1, 2006

Published
2007
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4. Energy redistribution in hierarchical systems of oscillators

Author

Danylenko, V. A., Mykulyak, S. V., and Skurativskyi, S. I.

Subjects
FOS: Physical sciences, Chaotic Dynamics (nlin.CD), Nonlinear Sciences - Chaotic Dynamics
Abstract

The article deals with the mathematical model for media with hierarchical structure. Using the hamiltonian formalism, the dynamical system describing the state of hierarchically connected structural elements was derived. According to the analysis of the Poincar\'e sections, we found the localized quasi-periodic and chaotic trajectories in the three-level hierarchical model. Moreover, studies of correlation functions shown that the power spectrum for three-level model possesses local maxima characterizing temporal scales with strong correlation. Using the Fourier analysis of the solution's components, we have studied the distribution of energy injected in the system over hierarchical levels. Dynamical phenomena in the multi-level system were studied as well., Comment: 12 pages, 8 figures

Published
2015
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5. Neutron recognition in the LAND detector for large neutron multiplicity

Author

E. Rapisarda, E. Le Gentil, C. Volant, T. Barczyk, A. Mykulyak, I. Iori, Håkan T Johansson, K. Sümmerer, A.N. Otte, M. De Napoli, P. Adrich, R. Bassini, J. Brzychczyk, Z. Majka, J. Łukasik, C. Sfienti, H. Weick, Giuseppe Verde, J.D. Frankland, S. Kupny, H. Sann, D. M. Rossi, A. Wieloch, M. D. Salsac, Cornelius Schwarz, S. Leray, M. Veselsky, A. Chbihi, D. Henzlova, Piotr Pawłowski, Y. Leifels, W. Trautmann, A. Boudard, S. Bianchin, A. Lafriakh, Alberto Pullia, H. Emling, J. Immè, J. Wiechula, C. Boiano, C.O. Bacri, J.-E. Ducret, U. Lynen, J. Lühning, S. Hlavac, M. Mocko, W. G. Lynch, H. Orth, H. Simon, A. Le Fèvre, Thomas Aumann, G. Raciti, T. Gorbinet, M. S. Wallace, K. Boretzky, M. B. Tsang, K. Kezzar, Stefano Panebianco, Margareta Hellström, J. Cibor, B. Zwieglinski, B. Czech, R. Palit, W. F. J. Müller, 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), 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
Nuclear reaction, Nuclear and High Energy Physics, LAND, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], neutron detection, 01 natural sciences, Particle detector, Nuclear physics, 0103 physical sciences, Neutron detection, Heavy-ion reactions, Neutron, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], heavy-ion reactions, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Physics, 010308 nuclear & particles physics, Detector, Measuring instrument, Nucleon
Abstract

The performance of the LAND neutron detector is studied. Using an event-mixing technique based on one-neutron data obtained in the S107 experiment at the GSI laboratory, we test the efficiency of various analytic tools used to determine the multiplicity and kinematic properties of detected neutrons. A new algorithm developed recently for recognizing neutron showers from spectator decays in the ALADIN experiment S254 is described in detail. Its performance is assessed in comparison with other methods. The properties of the observed neutron events are used to estimate the detection efficiency of LAND in this experiment., 16 pages, 8 figures

Published
2012
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6. Isospin-dependent multifragmentation of relativistic projectiles

Author

R. Bassini, Giuseppe Verde, K. Sümmerer, E. Le Gentil, J. Lühning, A. Boudard, Håkan T Johansson, H. Emling, W. G. Lynch, H. Orth, J. Wiechula, D. Henzlova, C. Volant, J. Łukasik, H. Simon, I. Iori, B. Zwieglinski, P. Adrich, H. Weick, A. Lafriakh, Alberto Pullia, C. Boiano, Z. Majka, Y. Leifels, A.N. Otte, M. De Napoli, Piotr Pawłowski, Margareta Hellström, Cornelius Schwarz, B. Czech, C. Sfienti, Wolfgang Müller, T. Barczyk, A. Mykulyak, Nihal Büyükçizmeci, A. S. Botvina, J.D. Frankland, S. Bianchin, K. Kezzar, M. B. Tsang, U. Atav, J.-E. Ducret, A. Wieloch, E. Rapisarda, G. Raciti, Igor Mishustin, J. Cibor, R. Palit, A. Chbihi, M. S. Wallace, J. Brzychczyk, U. Lynen, G. Imme, M. Mocko, W. Trautmann, H. Sann, C.O. Bacri, Riza Ogul, A. Le Fèvre, Thomas Aumann, 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), 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
Physics, Nuclear and High Energy Physics, Nuclear Theory, 010308 nuclear & particles physics, Hadron, FOS: Physical sciences, Fermion, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 3. Good health, Nuclear Theory (nucl-th), Baryon, Nuclear physics, Isospin, Excited state, 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Dimensionless quantity
Abstract

The N/Z dependence of projectile fragmentation at relativistic energies has been studied with the ALADIN forward spectrometer at the GSI Schwerionen Synchrotron (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. For the interpretation of the data, calculations with the statistical multifragmentation model for a properly chosen ensemble of excited sources were performed. The parameters of the ensemble, representing the variety of excited spectator nuclei expected in a participant-spectator scenario, are determined empirically by searching for an optimum reproduction of the measured fragment-charge distributions and correlations. An overall very good agreement is obtained. The possible modification of the liquid-drop parameters of the fragment description in the hot freeze-out environment is studied, and a significant reduction of the symmetry-term coefficient is found necessary to reproduce the mean neutron-to-proton ratios /Z and the isoscaling parameters of Z, 23 pages, 29 figures, published in Physical Review C

Published
2011
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7. Tracing a phase transition with fluctuations of the largest fragment size: Statistical multifragmentation models and the ALADIN S254 data

Author

Pietrzak, T., Adrich, P., Aumann, T., Bacri, C. O., Barczyk, T., Bassini, R., Bianchin, S., Boiano, C., Botvina, A. S., Boudard, A., Brzychczyk, J., Abdelouahad Chbihi, Cibor, J., Czech, B., Napoli, M., Ducret, J. E., Emling, H., Frankland, J. D., Hellstrom, M., Henzlova, D., Imme, G., Iori, I., Johansson, H., Kezzar, K., Lafriakh, A., Le Fevre, A., Le Gentil, E., Leifels, Y., Luhning, J., Lukasik, J., Lynch, W. G., Lynen, U., Majka, Z., Mocko, M., Muller, 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., Summerer, 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Lion, Michel

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

A phase transition signature associated with cumulants of the largest fragment size distribution has been identified in statistical multifragmentation models and examined in analysis of the ALADIN S254 data on fragmentation of neutron-poor and neutron-rich projectiles. Characteristics of the transition point indicated by this signature are weakly dependent on the A/Z ratio of the fragmenting spectator source. In particular, chemical freeze-out temperatures are estimated within the range 5.9 to 6.5 MeV. The experimental results are well reproduced by the SMM model., 7 pages, 3 figures, Proceedings of the International Workshop on Multifragmentation and Related Topics (IWM2009), Catania, Italy, November 2009.

Published
2010

8. 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
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9. Discriminant Analysis and Secondary-Beam Charge Recognition

Author

I. Iori, S. Bianchin, Z. Majka, Håkan T Johansson, H. Weick, M. B. Tsang, E. Le Gentil, P. Adrich, C. Volant, J. Łukasik, M. S. Wallace, T. Barczyk, Cornelius Schwarz, J.-E. Ducret, A. Mykulyak, Y. Leifels, E. Rapisarda, A. Lafriakh, Margareta Hellström, Alberto Pullia, B. Czech, A. Le Fèvre, H. Sann, Thomas Aumann, G. Imme, C. Sfienti, J.D. Frankland, W. F. J. Müller, C.O. Bacri, Giuseppe Verde, J. Cibor, H. Emling, U. Lynen, R. Palit, A. Chbihi, C. Boiano, J. Lühning, M. Mocko, G. Raciti, K. Sümmerer, K. Kezzar, W. G. Lynch, H. Orth, J. Brzychczyk, H. Simon, A. S. Botvina, B. Zwieglinski, W. Trautmann, Piotr Pawłowski, A. Wieloch, D. Henzlova, A. Boudard, J. Wiechula, A.N. Otte, M. De Napoli, R. Bassini, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), 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), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (INFN), Istituto Nazionale di Fisica Nucleare (INFN), 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), Istituto Nazionale di Fisica Nucleare, Sezione di Catania (INFN), Università degli studi di Catania [Catania], 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Università degli studi di Catania = University of Catania (Unict)

Subjects
Nuclear and High Energy Physics, Statistical methods, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Fragmentation (mass spectrometry), 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Physics, Isotope, radioactive beams, 02.50.Sk, 25.70.Mn, 010308 nuclear & particles physics, Projectile, Detector, projectile fragmentation, Linear discriminant analysis, discriminant analysis, Isospin, Beam (structure)
Abstract

The discriminant-analysis method has been applied to optimize the exotic-beam charge recognition in a projectile fragmentation experiment. The experiment was carried out at the GSI using the fragment separator (FRS) to produce and select the relativistic secondary beams, and the ALADIN setup to measure their fragmentation products following collisions with Sn target nuclei. The beams of neutron poor isotopes around 124La and 107Sn were selected to study the isospin dependence of the limiting temperature of heavy nuclei by comparing with results for stable 124Sn projectiles. A dedicated detector to measure the projectile charge upstream of the reaction target was not used, and alternative methods had to be developed. The presented method, based on the multivariate discriminant analysis, allowed to increase the efficacy of charge recognition up to about 90%, which was about 20% more than achieved with the simple scalar methods., Comment: 6 pages, 7 eps figures, elsart, submitted to Nucl. Instr. and Meth. A

Published
2008
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10. Isotopic effects in nuclear reactions at relativistic energies

Author

Sfienti, C., Napoli, M., Bianchin, S., Botvina, A. S., Brzychczyk, J., Le Fèvre, A., Lukasik, J., Pawlowski, P., Trautmann, W., Adrich, P., Aumann, T., Bacri, C. O., Barczyk, T., Bassini, R., Boiano, C., Boudard, A., Abdelouahad Chbihi, Cibor, J., Czech, B., Ducret, J. E., Emling, H., Frankland, J. D., Hellström, M., Henzlova, D., Kezzar, K., Immè, G., Iori, I., Johansson, H., Lafriakh, A., Le Gentil, E., Leifels, Y., Lynch, W. G., Lühning, J., Lynen, U., Majka, Z., Mocko, M., Müller, W. F. J., Mykulyak, A., Orth, H., Otte, A. N., Palit, R., Pullia, A., Raciti, G., Rapisarda, E., Sann, H., Schwarz, C., Simon, H., Sümmerer, K., Volant, C., Wallace, M., Weick, H., Wiechula, J., Wieloch, A., Zwieglinski, B., Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Laboratori Nazionali del Sud (LNS), Istituto Nazionale di Fisica Nucleare (INFN), 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 Milano (INFN), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), I. Iori, A. Tarantola, ALADIN, Istituto Nazionale di Fisica Nucleare, Sezione di Catania (INFN), Università degli studi di Catania [Catania], H. Niewodniczanski Institute of Nuclear Physics, Polska Akademia Nauk = Polish Academy of Sciences (PAN), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Università degli studi di Catania = University of Catania (Unict)

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

A systematic study of isotopic effects in the break-up of projectile spectators at relativistic energies has been performed at the GSI laboratory with the ALADiN spectrometer coupled to the LAND neutron detector. Besides a primary beam of 124Sn, also secondary beams of 124La and 107Sn produced at the FRS fragment separator have been used in order to extend the range of isotopic compositions. The gross properties of projectile fragmentation are very similar for all the studied systems but specific isotopic effects have been observed in both neutron and charged particle production. The breakup temperatures obtained from the double ratios of isotopic yields have been extracted and compared with the limiting-temperature expectation., Comment: 10 pages, 5 figures, Proceeding of the XLV International Winter Meeting on Nuclear Physics, Bormio (Italy), 14-21 January 2007

Published
2007

11. N/Z Dependence of Projectile Fragmentation

Author

W. G. Lynch, H. Orth, H. Simon, I. Iori, E. Le Gentil, J. Lukasik, Giuseppe Verde, G. Imme, Håkan T Johansson, C. Volant, H. Emling, A. Wieloch, Cornelius Schwarz, C. Boiano, K. Suemmerer, Y. Leifels, H. Sann, A. Chbihi, H. Weick, T. Barczyk, A. Mykulyak, C. Sfienti, M. S. Wallace, S. Bianchin, J.-E. Ducret, E. Rapisarda, J.D. Frankland, C.O. Bacri, J. Brzychczyk, A. Lafriakh, Alberto Pullia, Piotr Pawłowski, P. Adrich, J. Cibor, M. Hellstroem, B. Zwieglinski, R. Bassini, A. Le Fèvre, M. B. Tsang, Thomas Aumann, R. Palit, U. Lynen, G. Raciti, Z. Majka, B. Czech, W. F. Mueller, W. Trautmann, M. Mocko, D. Henzlova, A. Boudard, J. Wiechula, A.N. Otte, M. De Napoli, J. Luehning, K. Kezzar, A. S. Botvina, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), 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 d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), 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, Nuclear and High Energy Physics, Range (particle radiation), Spectrometer, Isotope, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, Limiting, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Neutron detection, Atomic number, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Projectile fragmentation, Beam (structure)
Abstract

The N/Z dependence of projectile fragmentation at relativistic energies has been studied in a recent experiment at the GSI laboratory with the ALADiN forward spectrometer coupled to the LAND neutron detector. Besides a primary beam of 124Sn, also secondary beams of 124La and 107Sn delivered by the FRS fragment separator have been used in order to extend the range of isotopic compositions of the produced spectator sources. With the achieved mass resolution of \Delta A/A \approx 1.5%, lighter isotopes with atomic numbers Z \le 10 are individually resolved. The presently ongoing analyses of the measured isotope yields focus on isoscaling and its relation to the properties of hot fragments at freeze-out and on the derivation of chemical freeze-out temperatures which are found to be independent of the isotopic composition of the studied systems. The latter result is at variance with the predictions for limiting temperatures as obtained with finite-temperature Hartree-Fock calculations., Comment: 11 pages, 5 figures, Proceedings of International Workshop on Nuclear Dynamics in Heavy-Ion Reactions and Neutron Stars, Beijing, July 10-14, 2007, to appear in International Journal of Modern Physics E

Published
2007
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12. Mass and Isospin Effects in Multifragmentation

Author

E. Le Gentil, C. Volant, H. Weick, I. Iori, J. Lühning, W. G. Lynch, H. Orth, A. Lafriakh, J.-E. Ducret, E. Rapisarda, W. Trautmann, J. Cibor, H. Simon, D. Henzlova, Alberto Pullia, R. Palit, A. Le Fèvre, Thomas Aumann, Y. Leifels, M. B. Tsang, C. Boiano, G. Imme, W. F. J. Müller, Margareta Hellström, B. Czech, Giuseppe Verde, M. Mocko, A. S. Botvina, U. Lynen, Håkan T Johansson, K. Sümmerer, M. S. Wallace, H. Sann, A. Sokolov, J. Brzychczyk, J. Łukasik, C.O. Bacri, K. Kezzar, Cornelius Schwarz, A. Wieloch, H. Emling, T. Barczyk, A. Mykulyak, P. Adrich, C. Sfienti, J.D. Frankland, A. Chbihi, R. Bassini, Z. Majka, B. Zwieglinski, A.N. Otte, M. De Napoli, G. Raciti, A. Boudard, J. Wiechula, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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
Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, 010308 nuclear & particles physics, Projectile, Nuclear Theory, FOS: Physical sciences, Multiplicity (mathematics), Observable, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, 01 natural sciences, Nuclear physics, Isospin, 0103 physical sciences, Incident energy, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

A systematic study of isospin effects in the breakup of projectile spectators at relativistic energies has been performed with the ALADiN spectrometer at the GSI laboratory (Darmstadt). Four different projectiles 197Au, 124La, 124Sn and 107Sn, all with an incident energy of 600 AMeV, have been used, thus allowing a study of various combinations of masses and N/Z ratios in the entrance channel. The measurement of the momentum vector and of the charge of all projectile fragments with Z>1 entering the acceptance of the ALADiN magnet has been performed with the high efficiency and resolution achieved with the TP-MUSIC IV detector. The Rise and Fall behavior of the mean multiplicity of IMFs as a function of Zbound and its dependence on the isotopic composition has been determined for the studied systems. Other observables investigated so far include mean N/Z values of the emitted light fragments and neutron multiplicities. Qualitative agreement has been obtained between the observed gross properties and the predictions of the Statistical Multifragmentation Model., 10 pages,7 figure, 18th Nuclear Physics Division Conference of the EPS, Prague, submitted to Nucl. Phys. A

Published
2004
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