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Start Over Author "Th. Blaich" Journal physical review letters
7 results on '"Th. Blaich"'

1. Fragment Flow and the Multifragmentation Phase Space

Author

L. G. Sobotka, W. Seidel, C. Williams, G. Imme, M. Neumann, W. G. Lynch, Wolfgang Müller, B. Zwieglinski, E. Zude, C. K. Gelbke, T. Möhlenkamp, M. L. Begemann-Blaich, Giuseppe Verde, U. Lynen, D. R. Bowman, V. Serfling, A. Ferrero, M. Mang, Th. Blaich, A. Tucholski, L. Stuttge, W. C. Hsi, G. J. Kunde, A. Schüttauf, S. Tomasevic, H. Sann, W. D. Kunze, B. Ocker, I. Iori, Graham F. Peaslee, A. Wörner, R. J. Charity, J. Stroth, M. A. Lisa, A. Cosmo, M. B. Tsang, C. A. Ogilvie, J. Pochodzalla, G. Raciti, J. Hubele, T. Rubehn, W. Trautmann, A. Moroni, V. Lindenstruth, P. Kreutz, Heyd, Yvette, Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Coalescence (physics), Physics, Spectrometer, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Computer Science::Information Retrieval, General Physics and Astronomy, Position and momentum space, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Space (mathematics), Nuclear physics, Phase space, Multiplicity (chemistry), Atomic physics, Nuclear Experiment, Nucleon
Abstract

Fragment distributions have been measured for Au+Au collisions at [ital E]/[ital A]=100 and 1000 MeV. A high detection efficiency for fragments was obtained by combining the ALADIN spectrometer and the MSU-Miniball/WU-Miniwall array. At both energies the maximum multiplicity of intermediate mass fragments (IMF) normalized to the size of the decaying system is about one IMF per 30 nucleons but the element distributions show significant differences. Within a coalescence picture the suppression of heavy fragments in central collisions at [ital E]/[ital A]=100 MeV may be related to a reduction of the density in momentum space which is caused by the collective expansion.

Published
1995
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2. Onset of nuclear vaporization inAu197+197Au collisions

Author

W. G. Lynch, U. Lynen, M. Mang, J. Kempter, L. G. Sobotka, A. Schüttauf, H. Sann, R. J. Charity, D. R. Bowman, W. A. Friedman, G. Imme, A. Tucholski, W. C. Hsi, V. Serfling, I. Iori, Wolfgang Müller, M. Neumann, J. Hubele, J. Pochodzalla, T. Hofmann, G. J. Kunde, J. Stroth, M. A. Lisa, V. Pappalardo, Th. Blaich, Graham F. Peaslee, M. L. Begemann-Blaich, A. Cosmo, B. Zwieglinski, W. Seidel, A. Wörner, L. Stuttge, F. Rosenberger, A. Ferrero, C. A. Ogilvie, B. Ocker, W. Trautmann, G. Peilert, P. Kreutz, M. B. Tsang, W. D. Kunze, E. Zude, G. Raciti, S. Aiello, C. K. Gelbke, V. Lindenstruth, R. Scardoni, and A. Moroni

Subjects
Physics, Nuclear physics, Nuclear reaction, Computer Science::Information Retrieval, Excited state, Vaporization, General Physics and Astronomy, Incident energy, Multiplicity (mathematics), Nuclear Experiment, Charged particle
Abstract

Multifragmentation has been measured for [sup 197]Au+[sup 197]Au collisions at [ital E]/[ital A]=100, 250, and 400 MeV. The mean fragment multiplicity increases monotonically with the charged particle multiplicity at [ital E]/[ital A]=100 MeV, but decreases for central collisions with incident energy, consistent with the onset of nuclear vaporization. Molecular dynamics calculations follow some trends but underpredict the observed fragment multiplicities. Including the statistical decay of excited residues improves the agreement for peripheral collisions but worsens it for central collisions.

Published
1993
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3. Exclusive studies of neutron and charged particle emission in collisions ofAu197+197Au at 400 MeV/nucleon

Author

H. Spies, E. Lubkiewicz, R. Holzmann, C. Schütter, S. Lange, R. Schmidt, E. F. Moore, H. Freiesleben, Th. W. Elze, W. Walus, E. Zude, H. Klingler, Markus Zinser, W. F. Henning, Y. Leifels, Th. Blaich, H. Emling, J. V. Kratz, R. Kulessa, E. Wajda, J. G. Keller, D. Lambrecht, K. Grimm, Joachim Stroth, W. Prokopowicz, and K. Stelzer

Subjects
Nuclear reaction, Physics, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Fermion, Charged particle, Nuclear physics, Baryon, Neutron, Atomic physics, Nuclear Experiment, Nucleon
Abstract

We present data on collective flow of neutrons in collisons of [sup 197]Au + [sup 197]Au at 400 MeV/nucleon. The azimuthal distribution about the beam axis is investigated with respect to the reaction plane as determined from light charged particles. The squeezeout'' of neutrons, perpendicular to the reaction plane, is observed for the first time. Quantitative agreement to a high level of accuracy is found between the behavior of neutrons and hydrogen ions.

Published
1993
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4. Electromagnetic excitation of the double giant dipole resonance inXe136

Author

W. F. Henning, J. S. Lange, R. Holzmann, Th. Blaich, H. Spies, J. V. Kratz, E. Zude, E. Lubkiewicz, E. F. Moore, H. Klingler, H. Freiesleben, J. G. Keller, H. J. Wollersheim, Y. Leifels, R. Kulessa, Th. W. Elze, Ch. Schütter, E. Wajda, W. Prokopowicz, W. Walus, K. Grimm, D. Lambrecht, Markus Zinser, K. Stelzer, R. Schmidt, Joachim Stroth, and H. Emling

Subjects
Nuclear reaction, Physics, Dipole, Isovector, Excited state, Giant resonance, Nuclear Theory, General Physics and Astronomy, Resonance, Neutron, Atomic physics, Nuclear Experiment, Excitation
Abstract

The nuclear response of a medium-mass nucleus ([sup 136]Xe) to electromagnetic excitation in a near-relativistic heavy-ion collision was investigated in the reaction[sup 136]Xe(0.7[ital A] GeV)+Pb. From an exclusive measurement of the neutron decay of the excited [sup 136]Xe projectiles, strong excitations of giant resonances and, in particular, of the double isovector giant dipole resonance were identified. A resonance energy of 28.3[plus minus]0.7 MeV, a width of 6.3[plus minus]1.6 MeV, and a total cross section of 215[plus minus]50 mb were found for the double giant dipole resonance.

Published
1993
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5. Midrapidity source of intermediate-mass fragments in highly central collisions of Au + Au at 150AMeV

Author

Alessandro Olmi, Y. Grigorian, Th. Blaich, P. Koncz, Z. Seres, T. Matulewicz, S. Hölbling, J. Kecskemeti, R. Tezkratt, D. Schüll, I. Legrand, M. Crouau, P. Fintz, R. Freifelder, J. P. Alard, M. A. Vasiliev, V. Simion, P. Morel, Z. Basrak, Fouad Rami, A. Sadchikov, F. Jundt, R. Kotte, Zoltan Fodor, Nello Taccetti, D. Pelte, C. Cerruti, R. Čaplar, Gerard Montarou, J. Erö, D. Moisa, A. Zhilin, Z. Wilhelmi, J. Mösner, K.D. Hildenbrand, K. Teh, T. Wienold, S. Smolyankin, A. Buta, Mihai Petrovici, U. Sodan, P. Wagner, G. Guillaume, S. C. Jeong, Gabriele Pasquali, W. Neubert, M. Jorio, Pascal Dupieux, G. Mgebrishvili, Y. Korchagin, Giacomo Poggi, J.P. Wessels, J. P. Coffin, W. Reisdorf, L. Fraysse, A. Gobbi, M. Trzaska, N. Cindro, Christian Claude Kuhn, C. Maguire, I. M. Belayev, M. Krämer, D. Wohlfarth, Z. G. Fan, Maurizio Bini, N. Herrmann, Vladislav Manko, B. Sikora, O. Houari, Nicole Bastid, A.L. Lebedev, S. Frolov, and R. Bock

Subjects
Physics, Nuclear physics, Nuclear reaction, Transverse plane, Isotope, General Physics and Astronomy, Incident energy, Isotopes of gold, Atomic physics, Nuclear Experiment, Selection criterion, Effective nuclear charge, Charged particle
Abstract

Charged particles have been observed in collisions of Au on Au at an incident energy of 150{ital A} MeV using a high-granularity detector system covering approximately the forward hemisphere in the center-of-mass system. Highly central collisions have been studied using a double selection criterion which combines large charged-particle multiplicities with small transverse-momentum directivities. In this class of events about one quarter of the total nuclear charge emerges as intermediate-mass fragments with nuclear charges {ital Z}{gt}2. These fragments are centered at midrapidity and are produced with large transverse velocities.

Published
1992
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6. Probing the nuclear liquid-gas phase transition

Author

Th. Blaich, A. Wörner, G. Imme, W. Seidel, V. Serfling, B. Ocker, A. Schüttauf, T. Möhlenkamp, V. Lindenstruth, H. Sann, W. Trautmann, C. Gross, U. Lynen, B. Zwieglinski, G. J. Kunde, Th. Rubehn, J. Pochodzalla, G. Raciti, W. F. J. Müller, H. Emling, A. Moroni, A. Tucholski, I. Iori, M.L. Begemann-Blaich, W. D. Kunze, A. Ferrero, E. Zude, A. Trzcinski, Joachim Stroth, Cornelius Schwarz, and Giuseppe Verde

Subjects
Physics, Phase transition, Isotopes of lithium, Nuclear Theory, General Physics and Astronomy, Neutron, Atomic physics, Nuclear Experiment, Nucleon, Isotopes of helium, Energy (signal processing), Nuclear density, Excitation, Nuclear Physics
Abstract

Fragment distributions resulting from $\mathrm{Au}+\mathrm{Au}$ collisions at an incident energy of $E/A\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}600\phantom{\rule{0ex}{0ex}}\mathrm{MeV}$ are studied. From the measured fragment and neutron distributions the mass and the excitation energy of the decaying prefragments were determined. A temperature scale was derived from observed yield ratios of He and Li isotopes. The relation between this isotope temperature and the excitation energy of the system exhibits a behavior which is expected for a phase transition. The nuclear vapor regime takes over at an excitation energy of 10 MeV per nucleon, a temperature of 5 MeV, and may be characterized by a density of 0.15--0.3 normal nuclear density.

Published
1995

7. Collective motion in selected central collisions of Au on Au at 150A MeV

Author

J. P. Wessels, Vladislav Manko, Alessandro Olmi, Pascal Dupieux, S. Boussange, P. Wagner, Gabriele Pasquali, P. R. Maurenzig, R. Freifelder, P. Koncz, D. Wohlfarth, J. Erö, Z. Basrak, S. C. Jeong, J. P. Coffin, L. Berger, Maurizio Bini, R. Dona, Z. Wilhelmi, A.L. Lebedev, Y. Korchagin, A. Gobbi, G. Mgebrishvili, I. Montbel, F. Jundt, J. P. Alard, P. Morel, J. Kecskemeti, N. Herrmann, V. Ramillien, R. Čaplar, C. Maguire, Fouad Rami, J. Mösner, M. A. Vasiliev, V. Simion, I. M. Belayev, A. Zhilin, C. Cerruti, J. Randrup, K. Teh, A. Buta, M. Krämer, B. Sikora, Th. Blaich, G. Guillaume, S. Hölbling, Z. Seres, W. Reisdorf, K. D. Hildenbrand, D. Schüll, I. Legrand, Christian Claude Kuhn, D. Moisa, S. Frolov, Nicole Bastid, T. Wienold, R. Kotte, D. Pelte, Gerard Montarou, S. Smolyankin, Mihai Petrovici, U. Sodan, Zoltan Fodor, V. Amouroux, M. Ibnouzahir, A. Sadchikov, L. Fraysse, M. Trzaska, N. Cindro, Z. G. Fan, Giacomo Poggi, P. Fintz, Y. Grigorian, R. Tezkratt, A. Houari, and W. Neubert

Subjects
Physics, Nuclear reaction, Nuclear physics, Complete data, Collective model, General Physics and Astronomy, Collective motion, Atomic physics, Kinetic energy, Spectral line, Calculation methods
Abstract

Using the FOPI facility at GSI Darmstadt complete data of Au on Au collisions at 150[ital A] MeV were collected for charged products ([ital Z]=1--15) at laboratory angles 1[degree][le][Theta][sub lab][le]30[degree]. Central collisions were selected by applying various criteria. The kinetic energy spectra of fragments from an isolated midrapidity source are investigated in detail for center-of-mass angles 25[degree][le][Theta][sub c.m.][le]45[degree]. The heavy products ([ital Z][ge]3) are used to determine the collective energy which is found to be at least 10[ital A] MeV.

Published
1994

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