Cluster Formation during Expansion of Hot and Compressed Nuclear Matter Produced in Central Collisions of Au on Au at 250<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">A</mml:mi></mml:math>MeV

Petrovici, M.; Herrmann, N.; Legrand, I.; Gobbi, A.; Hildenbrand, K. D.; Reisdorf, W.; Buţă, A.; Freifelder, R.; Jeong, S. C.; Krämer, M.; Moisă, D.; Schüll, D.; Simion, V.; Sodan, U.; Teh, K.; Wessels, J. P.; Wienold, T.; Alard, J. P.; Amouroux, V.; Basrak, Z.; Bastid, N.; Belyaev, I.; Berger, L.; Blaich, Th.; Boussange, S.; Čaplar, R.; Cerruti, C.; Cindro, N.; Coffin, J. P.; Donà, R.; Dupieux, P.; Erö, J.; Fintz, P.; Fodor, Z.; Fraysse, L.; Guillaume, G.; Hölbling, S.; Houari, A.; Jundt, F.; Kecskeméti, J.; Koncz, P.; Korchagin, Y.; Kötte, R.; Kuhn, C.; Ibnouzahir, M.; Lebedev, A.; Maguire, C.; Manko, V.; Mösner, J.; Montarou, G.; Montbel, I.; Morel, Pascal; Neubert, W.; Pelte, D.; Rami, F.; Ramillien, V.; Sadchikov, A.; Seres, Z.; Sikora, B.; Smolyankin, S.; Tezkratt, R.; Trzaska, M.; Vasiliev, M. A.; Wagner, P.; Wilhelmi, Z.; Wohlfarth, D.; Zhilin, A.

doi:10.1103/physrevlett.74.5001

Cited by 36 publications

(26 citation statements)

References 20 publications

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“…Thus, the size of the emission sources of the d, α, t and 3 He particles would be about 63%, 54%, 53% and 44% of that of the protons, respectively. This finding is in qualitative agreement with the results of an earlier investigation [28] of the cluster formation process in central Au+Au collisions at 250 A·MeV. There, the authors compare the experimental data with predictions of a model which describes the hydrodynamic isotropic expansion of an ideal nucleonic gas and the clustering by statistical disassembly.…”

Section: Discussionsupporting

confidence: 88%

On the space-time difference of proton and composite particle emission in central heavy-ion reactions at 400 A· MeV

Kötte¹,

Barz²,

Neubert³

et al. 1999

EPJ A

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Small-angle correlations of pairs of nonidentical light charged particles produced in central collisions of heavy ions in the A = 100 mass region at a beam energy of 400 A·MeV are investigated with the FOPI detector system at GSI Darmstadt. The difference of longitudinal correlation functions with the relative velocity parallel and anti-parallel to the center-of-mass velocity of the pair in the central source frame is studied. This method allows extracting the apparent space-time differences of the emission of the charged particles. Comparing the correlations with results of a final-state interaction model delivers quantitative estimates of these asymmetries. Time delays as short as 1 fm/c or -alternatively -source radius differences of a few tenth fm are resolved. The strong collective expansion of the participant zone introduces not only an apparent reduction of the source radius but also a modification of the emission times. After correcting for both effects a complete sequence of the space-time emission of p, d, t, 3 He, α particles is presented for the first time.PACS. 25.70.Pq

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Section: Discussionsupporting

confidence: 88%

On the space-time difference of proton and composite particle emission in central heavy-ion reactions at 400 A· MeV

Kötte¹,

Barz²,

Neubert³

et al. 1999

EPJ A

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“…Older exclusive information on heavy cluster formation from Bevalac times was limited to an experiment at 200 A MeV [15] concentrating on sideflow: a remarkable result of this study was the demonstrated higher sensitivity of the IMF's to flow, a fact that had been anticipated in the framework of hydrodynamical model calculations [16]. Since then, new information from central or semicentral collisions at energies beyond 100 A MeV has emerged from work done both at Berkeley and Darmstadt [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 93%

“…One of the important new observations, favoured by the sensitivity of IMF's to flow, was the overwhelming and unambiguous evidence of a new kind of axially symmetric or 'radial' flow [20][21][22]26,28] as a signature of highly exclusive central collisions. This flow was far more important in magnitude than the sideflow predicted [32] and discovered [33,34] earlier and was characteristic of participant matter, in contrast to the sideflow phenomenon which was primarily interpreted as a spectator phenomenon.…”

Section: Introductionmentioning

confidence: 99%

“…The new radial flow phenomenon was then quantized [20] and a first attempt using the model of ref. [35] was made [22] to trace back the initial conditions of compression and temperature from the measured momentum distributions and an approximate account for the chemical composition of the fireball could be done. It also became clear that radial flow was going to have an essential influence on the quantitative interpretation of small relative-momentum correlations between IMF's [24] aimed at determining the size of the fireball at freeze out.…”

Section: Introductionmentioning

confidence: 99%

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Central collisions of Au on Au at 150, 250 and 400 A·MeV

et al. 1997

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Collisions of Au on Au at incident energies of 150, 250 and 400 A MeV were studied with the FOPI-facility at GSI Darmstadt. Nuclear charge (Z ≤ 15) and velocity of the products were detected with full azimuthal acceptance at laboratory angles 1 • ≤ θ lab ≤ 30 • . Isotope separated light charged particles were measured with movable multiple telescopes in an angular range of 6 − 90 • . Central collisions representing about 1% of the reaction cross section were selected by requiring high total transverse energy, but vanishing sideflow. The velocity space distributions and yields of the emitted fragments are reported. The data are analysed in terms of a thermal model including radial flow. A comparison with predictions of the Quantum Molecular Model is presented.PACS: 25.70.Pq

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“…Despite of extensive efforts of several experimental groups [8] - [13] this question is not finally decided yet. The main reason is that, surprisingly enough, both approaches give very similar results for at least two key observables.…”

Section: Introductionmentioning

confidence: 99%

Multifragmentation of XE(50A MEV)+SN Confrontation of Theory with Data

Nebauer

Aichelin

1999

Nuclear Matter in Different Phases and Transitions

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We compare in detail central collisions Xe(50A MeV) + Sn, recently measured by the INDRA collaboration, with the Quantum Molecular Dynamics (QMD) model in order to identify the reaction mechanism which leads to multifragmentation. We find that QMD describes the data quite well, in the projectile/target region as well as in the midrapidity zone where also statistical models can be and have been employed. The agreement between QMD and data allows to use this dynamical model to investigate the reaction in detail. We arrive at the following observations: a) the in medium nucleon nucleon cross section is not significantly different from the free cross section, b) even the most central collisions have a binary character, c) most of the fragments are produced in the 1 central collisions and d) the simulations as well as the data show a strong attractive in-plane flow resembling deep inelastic collisions e) at midrapidity the results from QMD and those from statistical model calculations agree for almost all observables with the exception of d 2 σ dZdE . This renders it difficult to extract the reaction mechanism from midrapidity fragments only. According to the simulations the reaction shows a very early formation of fragments, even in central collisions, which pass through the reaction zone without being destroyed. The final transverse momentum of the fragments is very close to the initial one and due to the Fermi motion. A heating up of the systems is not observed and hence a thermal origin of the spectra cannot be confirmed.

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Cluster Formation during Expansion of Hot and Compressed Nuclear Matter Produced in Central Collisions of Au on Au at 250AMeV

Cited by 36 publications

References 20 publications

On the space-time difference of proton and composite particle emission in central heavy-ion reactions at 400 A· MeV

On the space-time difference of proton and composite particle emission in central heavy-ion reactions at 400 A· MeV

Central collisions of Au on Au at 150, 250 and 400 A·MeV

Multifragmentation of XE(50A MEV)+SN Confrontation of Theory with Data

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