Abstract
We study the directed transverse flow for mass asymmetry reactions. This is done by keeping the target fixed and varying the projectile mass from 4He to 131Xe. We find that directed transverse flow is sensitive to the mass of the projectile. We also study the disappearance of flow at a particular impact parameter called Geometry of Vanishing Flow (GVF) for such mass asymmetry reactions. Our results indicate that GVF is sensitive to the beam energy as well as to the mass of the projectile.
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P. Danielewicz, R. Lacey, and W. Lynch, “Determination of equation of state of dense matter,” Science 298, 1592 (2002).
Y. Zhang and Z. Li, “Elliptic flow and system size dependence of transition energies at intermediate energies,” Phys.Rev., Ser. C 74, 014602 (2006); M. W. Zhang et al., “Onset of flow of charged fragments in Au-Au collisions,” Phys. Rev., Ser. C 42, R491 (1990); D. Beavis et al., “Collective motion in Ar+Pb collision at beam energies between 400 and 1800 MeV/nucleon,” Phys. 1800 MeV/nucleon,” Phys. Rev., Ser. C 45, 299 (1999).
B. Hong et al., “Charged pion production in Ru96 + Ru96 collisions at 400 and 1528 A MeV,” Phys. Rev., Ser. C 71, 034902 (2002).
Q. Pan and P. Danielewicz, “From sideward flow to nuclear compressibility,” Phys. Rev. Lett. 70, 2062 (1993); V. Ramillien et al., “Sideward flow in Au + Au collisions at 400 A MeV,” Nucl. Phys., Ser. A 587, 802 (1995).
J. Lukasik et al., “Directed and elliptic flow in Au197 + Au197 at intermediate energies,” Phys. Lett., Ser. B 608, 223 (2005).
C. A. Ogilvie et al., “Transverse collective motion in intermediate-energy heavy-ion collisions,” Phys. Rev., Ser. C 40, 2592 (1989); B. Blättel et al., “Origin of transverse momentum in relativistic heavy-ion collisions: microscopic study,” Phys. Rev., Ser. C 43, 2728 (1991).
A. Andronic et al., “Directed flow in Au + Au, Xe + Csl and Ni + Ni collisions and the nuclear equation of state,” Phys. Rev., Ser. C 67, 034907 (2003); A. D. Sood and R. K. Puri, “Mass dependence of disappearance of transverse in-plane flow,” Phys. Rev., Ser. C 69, 054612 (2004); A. Andronic et al., “Systematic study of the energy of vanishing flow: Role of equations of state and cross-sections,” Phys. Rev., Ser. C 73, 067602 (2006); A. Andronic et al., “Influence of momentum-dependence interactions on balance energy and mass dependence,” Eur. Phys. J., Ser. A 30, 571 (2006).
S. Goyal, “Role of colliding geometry on the balance energy of mass-asymmetric systems,” Phys. Rev., Ser. C 83, 047604 (2011); S. Goyal and R. K. Puri, “On the sensitivity of the energy of vanishing flow towards mass asymmetry of colliding nuclei,” Nucl. Phys., Ser. A 853, 164 (2011).
B. A. Li et al., “Isospin dependence of collective flow in Heavy-ion collisions at intermediate energies,” Phys. Rev. Lett. 76, 4492 (1996).
R. Pak et al., “Isospin dependence of collective transverse flow in nuclear collisions,” Phys. Rev. Lett. 78, 1022 (1997); R. Pak et al., “Isospin dependence of the balance energy,” 78, 1026 (1997).
S. Gautam et al., “Sensitivity of the transverse flow to the symmetry energy,” Phys. Rev., Ser. C 83, 034606 (2011); V. Kaur, S. Kumar, and R. K. Puri, “On the elliptical flow and asymmetry of the colliding nuclei,” Phys. Lett., Ser. B 697, 512 (2011).
D. Krofcheck et al., “Disappearance of flow in heavyion collisions,” Phys. Rev. Lett. 63, 2028 (1989).
G. D. Westfall et al., “Mass dependence of disappearance of flow in nuclear collisions,” Phys. Rev. Lett. 71, 1986 (1993); A. Buta et al., “Azimuthal correlation functions and the energy of vanishing flow in nucleus-nucleus collisions,” Nucl. Phys., Ser. A 584, 397 (1995).
A. D. Sood and R. K. Puri, “Systematic study of energy of vanishing flow: role of equations of state and cross-sections,” Phys. Rev., Ser. C 73, 067602 (2006); D. J. Majestro et al., “Disappearance of flow in Au+Au collisions,” Phys. Rev., Ser. C 61, 021602(R) (2000); A. D. Sood and R. K. Puri, “Nuclear dynamics at the balance energy,” Phys. Rev., Ser. C 70, 034611 (2004); S. Kumar et al., “Impact parameter dependence of the disappearance of flow and in-medium nucleon-nucleon cross-section,” Phys. Rev., Ser. C 58, 3494 (1998).
L. Scalone, M. Colonna, and M. Di Toro, “Transverse flows in charge asymmetric collisions,” Phys. Lett., Ser. B 461, 9 (1991).
S. Gautam et al., “Isospin effects on the energy of vanishing flow in heavy-ion collisions,” J. Phys., Ser. G 37, 085102 (2010); S. Gautam and A. D. Sood, “Isospin effects on the mass dependence of the balance energy,” Phys. Rev., Ser. C 82, 014604 (2010); S. Gautam et al., “Isospin effects in the disappearance of flow as a function of colliding geometry,” Phys. Rev., Ser. C 83, 014603 (2011); S. Gautam and R. K. Puri, “Participation-spectator matter and thermalization of neutron-rich systems at the energy of vanishing flow,” Phys. Rev., Ser. C 85, 067601 (2012); S. Gautam, R. Kumari, and R. K. Puri, “Sensitivity of transverse flow toward isospin-dependent cross-sections and symmetry energy,” Phys. Rev., Ser. C 86, 034607 (2012).
S. Kumar et al., “Elliptic flow and isospin effects in heavy-ion collisions at intermediate energies,” Phys. Rev., Ser. C 81, 014611 (2010).
S. Kumar and R. K. Puri, “Effect of symmetry energy on nuclear stopping and its relation to the production of light charged fragments,” Phys. Rev., Ser. C 81, 014601 (2010).
R. Chugh and A. D. Sood, “Geometry of vanishing flow: a new probe to determine the in-medium nucleon-nucleon cross-section,” Parma. J. Phys. 77, 289 (2011); S. Goyal, “Role of the masses asymmetry of reaction on the geometry of vanishing flow,” Nucl. Phys., Ser. A 856, 154 (2011).
J. Aichelin and H. Stöcker, “Quantum molecular dynamics—A novel approach to N-body correlations in heavy-ion collisions,” Phys. Lett., Ser. B 176, 14 (1986).
J. Cugnon, T. Mizutani, and J. Vandermeulen, “Equilibrations in relativistic nuclear collisions. A Monte Carlo calculation,” Nucl. Phys., Ser. A 352, 505 (1981).
E. Lehmann et al., “Consequences of a covariant description of heavy-ion reactions at intermediate energies,” Phys. Rev., Ser. C 51, 2113 (1995); E. Lehmann et al., “Relativistic versus nonrelativistic quantum molecular dynamics,” Prog. Part. Nucl. Phys. 30, 219 (1993).
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Lovejot, Gautam, S. Directed transverse flow and its disappearance for asymmetric reactions. Phys. Part. Nuclei Lett. 11, 232–237 (2014). https://doi.org/10.1134/S1547477114030121
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DOI: https://doi.org/10.1134/S1547477114030121