Timescale for equilibration of N/Z gradients in dinuclear systems

Abstract

Equilibration of N/Z in binary breakup of an excited and transiently deformed projectile-like fragment (PLF*), produced in peripheral collisions of 64Zn + 27Al, 64Zn, 209Bi at E/A = 45 MeV, is examined. The composition of emitted light fragments (3<=Z<=6) changes with the decay angle of the PLF*. The most neutron-rich fragments observed are associated with a small rotation angle. A clear target dependence is observed with the largest initial N/Z correlated with the heavy, neutron-rich target. Using the rotation angle as a clock, we deduce that N/Z equilibration persists for times as long as 3-4 zs (1zs = 1 x 10^-21 s = 300 fm/c). The rate of N/Z equilibration is found to depend on the initial neutron gradient within the PLF*.

arXiv comment6 pages, 4 figures

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Cited by in corpus (7)

• Experimental effects on dynamics and thermodynamics in nuclear reactions on the symmetry energy as seen by the CHIMERA 4$\pi$ detector
• Dipolar degrees of freedom and Isospin equilibration processes in Heavy Ion collisions
• Symmetry energy dependence of long timescale isospin transport
• Exotic break-up modes in heavy ion reactions at low energies
• Isospin compositions of correlated sources in the Fermi energy domain
• Coulomb chronometry to probe the decay mechanism of hot nuclei
• Dynamic description of ternary and quaternary splits of heavy nuclear systems in the deep-inelastic regime