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Short-lived binary splits of an excited projectile-like fragment induced by transient deformation

Abstract : Aligned fragment emission associated with peripheral and midperipheral dissipative collisions of 124Xe+124Sn at E/A = 50 MeV is examined. Binary decay of the excited projectile-like fragment (PLF∗) is correlated with significant velocity damping from the projectile velocity. Both a forward emission component, attributed to standard statistical emission, and a backward component are observed. The backward component arises from both statistical and dynamical decay processes. This backward component manifests a strong alignment with the direction of the PLF∗ velocity and is found to depend sensitively on the atomic number of the light fragment, ZL, and the velocity of the PLF∗. The yield of the backward component is significantly enhanced relative to the forward component. The composition of fragments emitted in the backward direction reveals that a correlation between alignment and neutron excess exists for fragments with Z < 8. From the measured asymmetry of the angular distributions, the angular distribution for dynamical fragment emission is deduced. Comparison with a schematic one-dimensional Langevin model allows extraction of both the magnitude and the dependence on ZL of the transient initial deformation of the PLF∗. Fragment emission times of the order of 0.25–1.5 × 10−21 s are extracted.
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http://hal.in2p3.fr/in2p3-00462432
Contributor : Michel Lion <>
Submitted on : Tuesday, March 9, 2010 - 4:31:53 PM
Last modification on : Monday, July 20, 2020 - 1:06:04 PM

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A. B. Mcintosh, S. Hudan, J. Black, D. Mercier, C. J. Metelko, et al.. Short-lived binary splits of an excited projectile-like fragment induced by transient deformation. Physical Review C, American Physical Society, 2010, 81, pp.034603. ⟨10.1103/PhysRevC.81.034603⟩. ⟨in2p3-00462432⟩

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