Collective Flow Measurements in Asymmetric Nuclear Collisions

Gösset, J.; Démoulins, M.; L’Hôte, D.; Valette, O.; Alard, J. P.; Augerat, J.; Babinet, R.; Bastid, N.; Brochard, F.; Cavata, C.; Charmensat, P.; Marco, N De; Dupieux, P.; Fanet, Hervé; Fodor, Z.; Fraysse, L.; Gorodetzky, P.; Lemaire, M. C.; Lucas, B.; Marroncle, J.; Montarou, G.; Parizet, M.J.; Poitou, J.; Qassoud, D.; Racca, C.; Rahmani, A.; Schimmerling, W.; Terrien, Y.

doi:10.1007/978-1-4613-0583-5_6

Cited by 2 publications

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References 8 publications

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“…In experiments the transverse component of the collective flow is generally analyzed by the Danielewicz and Odyniec's method [-1], which could determine the reaction plane and provide a quantitative method to get the collective flow via the component of the transverse momentum of the emitted particles in the reaction plane. While the out-of-plane component [16,17], longitudinal component of the collective flow and the flow angle can give additional information [18,19], but they have not been researched in detail. Experimentally these components can be obtained by a simple extension of the transverse momentum analysis [18].…”

Section: Introductionmentioning

confidence: 99%

Components of collective flow and azimuthal distribution in40Ar+27Al collision with BUU method

Shen

Feng

et al. 1993

Z. Physik A - Hadrons and Nuclei

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Abstract. The in-plane, out-of-plane and longitudinal components of the collective flow are extracted from the BUU simulation for 4~ + 27A1 collision in intermediate energy domain. It is found that the in-plane collective flow changes from a negative value to a positive value around 85 MeV/u. The flow angles are estimated by the in-plane and longitudinal components of the collective flow, and the rotational behavior in addition to the inplane flow is also found by the asymmetry of the azimuthal distribution in the calculation.

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Section: Introductionmentioning

confidence: 99%

Components of collective flow and azimuthal distribution in40Ar+27Al collision with BUU method

Shen

Feng

et al. 1993

Z. Physik A - Hadrons and Nuclei

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“…In order to quantify above rotation-like behavior, a systematic study has been performed by fitting these distributions with a Legendre polynomial expansion up to second order, with parameter ao, al and az depending upon the rapidity, as in [16,17,24,36] : dN/dO=ao+al cos ~b + a2 cos(2q~). and particles with Z = 2 (I).…”

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confidence: 99%

Rotation-like behavior as a function of projectile energy and target mass

Shen

Feng

et al. 1993

Z. Physik A - Hadrons and Nuclei

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Abstract. The azimuthal distributions produced in the intermediate energy 4~reactions are calculated via the nuclear transport theory. The rotational collective motion is observed from the mid-rapidity particles emission. In addition to the investigation on particle emission in the coordinate space, the momentum distributions of emitted particles as a function of azimuthal angle are also discussed. The azimuthal distributions are fitted by performing Legendre polynomial expansion to second order. By incorporating the fluctuation between the estimated and true reaction plane into our calculations, quantitative agreements with the data are obtained for 4~ reactions below 85 MeV/nucleon. It is found that the rotation-like behavior becomes stronger with the increasing of the impact parameter and weaker with the increasing of the projectile energy. For 4~ system at about 85 MeV/nucleon the rotation-like behavior almost vanishes and the mid-rapidity azimuthal distribution tends to be isotropic. For 35 MeV/nucleon 4~ reactions the rotation-like behavior becomes weaker and the out-of-plane enhancement of particle emission appears with the increasing of target mass. The possible origins of these target mass dependent azimuthal distributions at mid-rapidity are discussed. PACS: 25.70.PqA main goal of intermediate energy heavy ion collisions (HIC) is to investigate the dynamic mechanism and extract information about the nuclear equation of state (EOS). Various observables have been proposed in the past, including energetic particle productions, flow angles, in-plane collective flow, etc. Some models which attempt to calculate these observables can be found in recent review articles [1][2][3][4][5][6].In this work we examine the azimuthal distribution as a testing ground for the nuclear dynamics. Some experiments to measure such distributions for fission flagments, charged particles and neutrons have been performed at the both intermediate-I-7-14] and high-energy domain [-15-21]. At high energy, out-of-plane enhancement of particle emission at mid-rapidity has been discovered, so-called the squeeze-out effect. But up to now, it is not found for light reaction systems. At intermediate tenergy, m-plane enhancement of particle emission is dominant, and it is considered to have origins of such as in-plane collective flow and rotation-like behavior.The effect of the in-plane collective flow on the azimuthal distribution should result in peaking at +180 ~ at low rapidity (target rapidity region) and at 0 ~ at high rapidity (projectile rapidity region), and should vanish at midrapidity 9 So the azimuthal distribution at mid-rapidity is sensitive to the mechanism of particle emission 9 It was proved that there existed preferential emission with respect to the reaction plane on the side of target and projectile at mid-rapidity due to the rotation-like behavior at intermediate energy for some systems [12-14, 22, 23]. Although both the squeeze-out effect and the rotation-like behavior were discovered respectively at different energy d...

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Collective Flow Measurements in Asymmetric Nuclear Collisions

Cited by 2 publications

References 8 publications

Components of collective flow and azimuthal distribution in40Ar+27Al collision with BUU method

Components of collective flow and azimuthal distribution in40Ar+27Al collision with BUU method

Rotation-like behavior as a function of projectile energy and target mass

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