Dynamical effects in nuclear collisions in the Fermi energy range: aligned breakup of heavy projectiles

Bocage, F.; Colin, J.; Louvel, M.; Auger, G.; Bacri, C.O.; Bellaize, N.; Borderie, B.; Bougault, R.; Brou, R.; Buchet, P.; Charvet, J. L.; Chbihi, A.; Cussol, D.; Dayras, R.; Cesare, N. De; Demeyer, A.; Doré, D.; Durand, D.; Frankland, J.D.; Galichet, E.; Genouin-Duhamel, E.; Gerlic, E.; Guinet, D.; Lautesse, P.; Laville, J.L.; Lecolley, J.F.; Légrain, R.; Neindre, N. Le; Lopez, O.; Maskay, A. M.; Nalpas, L.; Nguyen, A.D.; Pârlog, M.; Péter, J.; Plagnol, E.; Rivet, M. F.; Rosato, E.; Saint‐Laurent, F.; Salou, S.; Steckmeyer, J.C.; Stern, M.; Tăbăcaru, G.; Tamain, B.; Tirel, O.; Tassan‐Got, L.; Vient, E.; Vigilante, M.; Volant, C.; Wieleczko, J. P.; Brun, C. Le; Genoux‐Lubain, A.; Rudolf, G.; Stuttgé, L.

doi:10.1016/s0375-9474(00)00193-7

Cited by 71 publications

(47 citation statements)

References 33 publications

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“…The corresponding relative velocities were higher than the value predicted by the Viola systematics [28]. These aligned break-ups represent up to 75% of the binary break-up for the Xe+Sn system [13]. In this paper, we will extend these studies performed for binary break-up to higher fragment multiplicities to test to what extent these effects are present for other exit channels.…”

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confidence: 82%

“…Statistical decay models are widely used and dedicated to describe the decay of hot fully equilibrated systems, defined as systems having reached energy, shape and isospin equilibrium [1,2,3,4,5,6,7,8,9]. However other experimental works show strong effects of the entrance channel on the decay modes of the formed hot systems [10,11,12,13,14,15,16,17,18,19,20,21,22,23]. These effects which are not taken into account in the statistical decay models can provide complementary information on the nuclei such as the characteristics of the nucleon-nucleon interaction [24,25,26,27] and/or the viscosity of the nuclear matter.…”

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confidence: 99%

“…Up to now, these entrance channel effects have been studied by tracking deviations from the standard fission process in the quasi-projectile break-up [13,14,18,19,22]. Such deviations have been seen on the angular distributions, which show the focusing of the break-up axis along the quasi-projectile velocity direction.…”

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confidence: 99%

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Dynamical effects in multifragmentation at intermediate energies

Colin¹,

Cussol²,

Normand³

et al. 2003

Phys. Rev. C

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The fragmentation of the quasi-projectile is studied with the INDRA multidetector for different colliding systems and incident energies in the Fermi energy range. Different experimental observations show that a large part of the fragmentation is not compatible with the statistical fragmentation of a fully equilibrated nucleus. The study of internal correlations is a powerful tool, especially to evidence entrance channel effects. These effects have to be included in the theoretical descriptions of nuclear multifragmentation.

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confidence: 82%

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confidence: 99%

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Dynamical effects in multifragmentation at intermediate energies

Colin¹,

Cussol²,

Normand³

et al. 2003

Phys. Rev. C

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“…[163,53]. In fact a simultaneous presence, in noncentral collisions, of different IMF production mechanisms at midrapidity was inferred in several experiments [182,183,184,185,186,188]. …”

Section: Isospin Dynamics For Neck Fragmentation In Semiperipheral Comentioning

confidence: 99%

Reaction dynamics with exotic nuclei

et al. 2005

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Iste magistrorum locus est simul et puerorum, mittunt quando volunt hic res quas perdere nolunt [1]. AbstractWe review the new possibilities offered by the reaction dynamics of asymmetric heavy ion collisions, using stable and unstable beams. We show that it represents a rather unique tool to probe regions of highly Asymmetric Nuclear Matter (AN M ) in compressed as well as dilute phases, and to test the in-medium isovector interaction for high momentum nucleons. The focus is on a detailed study of the symmetry term of the nuclear Equation of State (EOS) in regions far away from saturation conditions but always under laboratory controlled conditions. Thermodynamic properties of AN M are surveyed starting from nonrelativistic and relativistic effective interactions. In the relativistic case the role of the isovector scalar δ-meson is stressed. The qualitative new features of the liquid-gas phase transition, "diffusive" instability and isospin distillation, are discussed. The results of ab-initio simulations of n-rich, n-poor, heavy ion collisions, using stochastic isospin dependent transport equations, are analysed as a function of beam energy and centrality. The isospin dynamics plays an important role in all steps of the reaction, from prompt nucleon emissions to the final fragments. The isospin diffusion is also of large interest, due to the interplay of asymmetry and density gradients. In relativistic collisions, the possibility of a direct study of the covariant structure of the effective nucleon interaction is shown. Results are discussed for particle production, collective flows and iso-transparency.Perspectives of further developments of the field, in theory as well as in experiment, are presented.

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“…Such a perspective is supported by experimental observation. For peripheral collisions of two heavy-ions at intermediate energies, the phenomenon of dynamical fission is well characterized [39,40,41]. This dynamical fission has been associated with the deformation of the PLF * induced by the collision process.…”

Section: General Reaction Characteristicsmentioning

confidence: 99%

Short timescale behavior of colliding heavy nuclei at intermediate energies

2006

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An Antisymmetrized Molecular Dynamics model is used to explore the collision of 114 Cd projectiles with 92 Mo target nuclei at E/A=50 MeV over a broad range in impact parameter. The atomic number (Z), velocity, and emission pattern of the reaction products are examined as a function of the impact parameter and the cluster recognition time. The non-central collisions are found to be essentially binary in character resulting in the formation of an excited projectile-like fragment (PLF * ) and target-like fragment (TLF * ). The decay of these fragments occurs on a short timescale, 100≤t≤300 fm/c. The average excitation energy deduced for the PLF * and TLF * 'saturates for mid-central collisions, 3.5≤b≤6 fm, with its magnitude depending on the cluster recognition time. For short cluster recognition times (t=150 fm/c), an average excitation energy as high as ≈6 MeV is predicted. Short timescale emission leads to a loss of initial correlations and results in features such as an anisotropic emission pattern of both IMFs and alpha particles emitted from the PLF * and TLF * in peripheral collisions.

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Dynamical effects in nuclear collisions in the Fermi energy range: aligned breakup of heavy projectiles

Cited by 71 publications

References 33 publications

Dynamical effects in multifragmentation at intermediate energies

Dynamical effects in multifragmentation at intermediate energies

Reaction dynamics with exotic nuclei

Short timescale behavior of colliding heavy nuclei at intermediate energies

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