1. Aligned ternary partitioning of the 197Au+197Au system at 23 A MeV beam energy
- Author
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L. Grassi, Ji-Youn Han, Marina Trimarchi, Michele Papa, A. Pagano, R. Najman, T. Cap, K. Siwek-Wilczyńska, F. Amorini, Antonio Trifiro, Tomasz Kozik, Ivano Lombardo, E. Geraci, E. De Filippo, G. Cardella, P. Russotto, G. Lanzalone, N. G. Nicolis, J. Wilczyński, A. Grzeszczuk, Lucrezia Auditore, W. Zipper, G. Politi, I. Skwira-Chalot, F. Rizzo, E. La Guidara, E. Piasecki, Giuseppe Verde, S. Pirrone, and R. Płaneta
- Subjects
Physics ,Mass number ,projectile breakup ,nucleus–nucleus collisions ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,polar-side emission ,aligned ternary partitioning ,Primary (astronomy) ,Polar ,Atomic physics ,Ternary operation ,Nuclear Experiment ,Beam energy ,Mathematical Physics ,Astrophysics::Galaxy Astrophysics ,neck-side emission - Abstract
Ternary partitions of the ^{197}Au+^{197}Au system in collisions at 23 A MeV beam energy have been studied. It is observed that the mass number distribution of the lightest fragments, called intermediate mass fragments (IMF), extends up to mass numbers corresponding to partitions into three comparable fragments. The lightest IMFs of A_{IFM} < 20 show well known features of prompt emission originating from the interaction zone (neck) during reseparation. Heavier IMFs (of A_{IFM} > 30) definitely originate from sequential (but not equilibrated) decay of the primary projectile-like fragments (PLF*) (or target-like fragments (TLF*)). The decaying system evidently keeps memory of the neck configuration and consequently the IMFs are emitted collinearly either from the neck side or from the opposite side along the separation axis (polar emission). The new intriguing process of the polar emission dominates for IMFs of A_{IMF} > 50.
- Published
- 2014