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arXiv · 1305.1320

Timescale for equilibration of N/Z gradients in dinuclear systems

K. Brown·S. Hudan·R. T. de Souza·J. Gauthier·R. Roy·D. V. Shetty·G. A. Souliotis·S. J. Yennello
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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*.

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K. Brown, S. Hudan, R. T. de Souza, J. Gauthier, R. Roy, D. V. Shetty, G. A. Souliotis, S. J. Yennello. 2013-05-06. Timescale for equilibration of N/Z gradients in dinuclear systems. https://doi.org/10.1103/physrevc.87.061601

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