Delayed fission and multifragmentation in sub-keV C-60 - Au(001) collisions via molecular dynamics simulations: Mass distributions and activated statistical decay

作者：Bernstein V; Kolodney E^*

来源：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , 2017, 409: 229-234.

DOI：10.1016/j.nimb.2017.05.060

• Surface scattering
• Molecular ion beams
• Fullerens
• Molecular dynamics
• Multifragmentation

We have recently observed, both experimentally and computationally, the phenomenon of postcollision multifragmentation in sub-keV surface collisions of a C-60 projectile. Namely, delayed multiparticle breakup of a strongly impact deformed and vibratiohally excited large cluster collider into several large fragments, after leaving the surface. Molecular dynamics simulations with extensive statistics revealed a nearly simultaneous event, within a sub-psec time Here we study, computationally, additional essential aspects of this new delayed collisional fragmentation which were not addressed before. Specifically, we study here the delayed (binary) fission channel for different impact energies both by calculating mass distributions over all fission events and by calculating and analyzing lifetime distributions of the scattered projectile. We observe an asymmetric fission resulting in a most probable fission channel and we find an activated exponential (statistical) decay. Finally, we also calculate and discuss the fragment mass distribution in (triple) multifragmentation over different time windows, in terms of most abundant fragments.

• 出版日期2017-10-15