Dynamical effects and intermediate mass fragment production in peripheral and semicentral collisions of Xe+Sn at 50 MeV/nucleon

Łukasik, J.; Benlliure, J.; Métivier, Vincent; Plagnol, E.; Tamain, B.; Assenard, M.; Auger, G.; Bacri, C.O.; Bisquer, E.; Borderie, B.; Bougault, R.; Brou, R.; Buchet, P.; Charvet, J. L.; Chbihi, A.; Colin, J.; Cussol, D.; Dayras, R.; Demeyer, A.; Doré, D.; Durand, D.; Gerlic, E.; Germain, Sandrine; Gourio, D.; Guinet, D.; Lautesse, P.; Laville, J.L.; Lecolley, J.F.; Févre, A. Le; Lefort, T.; Légrain, R.; Lopez, O.; Louvel, M.; Marie, N.; Nalpas, L.; Pârlog, M.; Péter, J.; Politi, O.; Rahmani, A.; Reposeur, T.; Rivet, M. F.; Rosato, E.; Saint‐Laurent, F.; Squalli, M.; Steckmeyer, J.C.; Stern, M.; Tassan‐Got, L.; Vient, E.; Volant, C.; Wieleczko, J. P.; Colonna, M.; Haddad, Férid; Eudes, P.; Sami, T.; Sébille, F.

doi:10.1103/physrevc.55.1906

Cited by 131 publications

(82 citation statements)

References 30 publications

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“…About half of the charged particles from this source are 4 He and only 10% are free protons. Similiar results have been obtained in other papers [13,21,24,10]. The number of neutrons is approximately the same as the number of charged particles, or 10 times the number of protons in this source [23].…”

supporting

confidence: 68%

“…Different regions of velocity space are generally believed to reveal characteristics of different sources, such as the midrapidity particle source for the low-density neck region. Several intermediateenergy experiments pointed out to a neutron-rich midrapidity source in peripheral heavyion collisions [10,13,21]. Sobotka et al [23] [21,24] and gave a quantitative description of the midrapidity source.…”

mentioning

confidence: 99%

“…Several intermediateenergy experiments pointed out to a neutron-rich midrapidity source in peripheral heavyion collisions [10,13,21]. Sobotka et al [23] [21,24] and gave a quantitative description of the midrapidity source. About half of the charged particles from this source are 4 He and only 10% are free protons.…”

mentioning

confidence: 99%

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Effect of cluster formation on isospin asymmetry in the liquid-gas phase transition region

Shi¹,

Danielewicz²

2000

Europhys. Lett.

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Nuclear matter within the liquid-gas phase transition region is investigated in a mean-field two-component Fermi-gas model. Following largely analytic considerations, it is shown that: (1) Due to density dependence of asymmetry energy, some of the neutron excess from the high-density phase could be expelled into the low-density region. (2) Formation of clusters in the gas phase tends to counteract this trend, making the gas phase more liquid-like and reducing the asymmetry in the gas phase. Flow of asymmetry between the spectator and midrapidity region in reactions is discussed and a possible inversion of the flow direction is indicated.

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confidence: 68%

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confidence: 99%

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Effect of cluster formation on isospin asymmetry in the liquid-gas phase transition region

Shi¹,

Danielewicz²

2000

Europhys. Lett.

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“…For more than 20 years, two-particle intensity interferometry has been used as a probe, yielding a convoluted space-time information that, however, is difficult to disentangle [1,2,3,4]. This is because of the presence of multiple sources, and the competition of non-equilibrium emission processes with equilibrium relaxation modes, leading to a broad range of origins of the measured particles [5,6,7,8,9,10,11,12,13]. It is the purpose of this paper to discuss some of the assumptions made when inferring emission chronology from velocity gated experimental correlation functions.…”

Section: Introductionmentioning

confidence: 99%

Implications of two-body fragment decay for the interpretation of emission chronology from velocity-gated correlation functions

2006

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From velocity-gated small-angle correlation functions the emission chronology can be deduced for non-identical particles, if the emission is independent. This is not the case for non-identical particles that originate from two-body decay of fragments. Experimental results may contain contributions from both independent emission and two-body decay, so care is needed in interpreting the velocity-gated correlation functions. It is shown that in some special cases, it is still possible to deduce the emission chronology, even if there is a contribution from two-body decay.

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“…It was first established that binary dissipative collisions dominate the reaction cross section in this energy range for a large domain of entrance channel masses and asymmetries [1][2][3][4][5]. Early, it has been noticed that unlike the lower energy case, where exclusively two primary fragments (or one fusion fragment) are formed [6], the intermediate energy heavy ion collisions produce exotic structures that populate the intermediate-velocity (IV) zone between the two main collision partners [8][9][10][11][12][13][14][15][16]. This production of particles and fragments at mid-velocity is usually explained as the onset of the participant-spectator model of relativistic energies [17].…”

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confidence: 99%

Origins of intermediate velocity particle production in heavy ion reactions

et al. 2002

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Investigation of intermediate-velocity particle production is performed on entrance channel mass asymmetric collisions of 58 Ni+C and 58 Ni+Au at 34.5 MeV/nucleon. Distinctions between prompt pre-equilibrium ejections, multiple neck ruptures and an alternative phenomenon of delayed aligned asymmetric breakup is achieved using source reconstructed correlation observables and time-based cluster recognition in molecular dynamics simulations. PACS number(s): 25. 25.70.Lm, 25.70.Mn, 25.70.Pq During the last decade, reaction mechanisms studies of heavy ion collisions in the Fermi energy domain have unraveled new and interesting phenomena that can have major consequences on our understanding of both nuclear dynamics and excited nuclear matter properties. It was first established that binary dissipative collisions dominate the reaction cross section in this energy range for a large domain of entrance channel masses and asymmetries [1][2][3][4][5]. Early, it has been noticed that unlike the lower energy case, where exclusively two primary fragments (or one fusion fragment) are formed [6], the intermediate energy heavy ion collisions produce exotic structures that populate the intermediate-velocity (IV) zone between the two main collision partners [8][9][10][11][12][13][14][15][16]. This production of particles and fragments at mid-velocity is usually explained as the onset of the participant-spectator model of relativistic energies [17]. However, in the Fermi energy domain, the interplay between two-body interactions and collective motions from the nuclear mean field modifies this simple picture and can potentially give rise to peculiar mechanisms leading to such an important observed IV particle production. Of those mechanisms, fast light particles and coalescence clusters ejected by nucleon-nucleon collisions and multiple neck ruptures are usually expected to be responsible for the main IV particle production. [18] and references therein for more information on detectors and energy calibration. The main trigger for event recording was a charged particle multiplicity of at least 3 particles. The present work is restricted to events selected in the off-line analysis by a total detected charge of at least 31 units. This ensures good reconstruction of the quasi-projectile and IV particles characteristics.In order to evaluate properties of the IV material, it needs to be isolated from its surrounding. This is done by reconstructing on an event-by-event basis the quasiprojectile (QP) and quasi-target (QT) emitters using a probabilistic reconstruction algorithm for the first nucleus and angular and velocity cuts for emissions of the second one. The statistical quasi-projectile reconstruction algorithm proceeds by two steps consisting in building probability tables for the attribution to the QP of a final detected particle and an application of these probabilities on an event-by-event basis. The main hypotheses on which the algorithm relies on are: (1) the event 1

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Dynamical effects and intermediate mass fragment production in peripheral and semicentral collisions of Xe+Sn at 50 MeV/nucleon

Cited by 131 publications

References 30 publications

Effect of cluster formation on isospin asymmetry in the liquid-gas phase transition region

Effect of cluster formation on isospin asymmetry in the liquid-gas phase transition region

Implications of two-body fragment decay for the interpretation of emission chronology from velocity-gated correlation functions

Origins of intermediate velocity particle production in heavy ion reactions

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