2000/07/19 by J. D. Frankland, Ch. O. Bacri, Ch.O. Bacri +45 · 53 citations
Engineering · Physics and Astronomy · #Astrophysics #Atomic physics #Classical mechanics #Event (particle physics) #Excited state #Isotropy #Kinetic energy #Nuclear Physics and Applications #Nuclear physics #Nuclear physics research studies #Nuclear reactor physics and engineering #Optics #Physics #Projectile #nucl-ex
paper · pdf · doi:10.1016/s0375-9474(00)00606-0
published in Nuclear Physics A 689(3-4), 905-939 (Elsevier BV) · 39 pages including 15 figures; submitted to Nucl. Phys. A
arxiv created 2000/07/19 · openalex publication_date 2001/07/01 · arxiv updated 2017/08/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A sample of `single-source' events, compatible with the multifragmentation of very heavy fused systems, are isolated among well-measured 155Gd+natU 36AMeV reactions by examining the evolution of the kinematics of fragments with Z>=5 as a function of the dissipated energy and loss of memory of the entrance channel. Single-source events are found to be the result of very central collisions. Such central collisions may also lead to multiple fragment emission due to the decay of excited projectile- and target-like nuclei and so-called `neck' emission, and for this reason the isolation of single-source events is very difficult. Event-selection criteria based on centrality of collisions, or on the isotropy of the emitted fragments in each event, are found to be inefficient to separate the two mechanisms, unless they take into account the redistribution of fragments' kinetic energies into directions perpendicular to the beam axis. The selected events are good candidates to look for bulk effects in the multifragmentation process.