Dissipation of angular momentum in light heavy ion collision

Abstract

The inclusive energy distributions of fragments (4$\le$Z$\le$7) emitted in the reactions ${}^{16}$O (116 MeV) + ${}^{27}$Al, ${}^{28}$Si, ${}^{20}$Ne (145 MeV) + ${}^{27}$Al, ${}^{59}$Co have been measured in the angular range ${\theta }_{lab}$= 10${}^{\circ }$ - 65${}^{\circ }$. Fusion-fission and deep inelastic components of the fragment emission have been extracted from the experimental data. The angular mometum dissipations in fully damped deep inelastic collisions have been estimated assming exit channel configuration similar to those for fusion-fission process. It has been found that, the angular momentum dissipations are more than those predicted by the empirical sticking limit in all cases. The deviation is found to increase with increasing charge transfer (lighter fragments). Qualitatively, this may be due to stronger friction in the exit channel. Moreover, for the heavier system ${}^{20}$Ne + ${}^{59}$Co, the overall magnitude of deviation is less as compared to those for the lighter systems, {\it i.e.}, ${}^{16}$O + ${}^{27}$Al, ${}^{28}$Si, ${}^{20}$Ne + ${}^{27}$Al. This may be due to lesser overlap in time scales of fusion and deep inelastic time scales for heavier systems.

15 pages, 9 figures, accepted for publication in Phys. Rev. C

References in corpus (8)

• Binary Decay of Light Nuclear Systems
• Extended Hauser-Feshbach Method for Statistical Binary-Decay of Light-Mass Systems
• Macroscopic Features of Light Heavy-Ion Fission Reactions
• A Dynmical study of Fission Process and estimation of Prescission Neutron Multiplicity
• Study of the Fusion-Fission Process in the ${}^{35}Cl{+}^{24}Mg$ Reaction
• ${}^{35}$Cl+${}^{12}$C Asymmetrical fission excitation functions
• Entrance-channel Mass-asymmetry Dependence of Compound-nucleus Formation Time in Light Heavy-ion Reactions
• Dissipative collisions in ${}^{16}$O + ${}^{27}$Al at E${}_{lab}$=116 MeV

Cited by in corpus (5)

• Survival of orbiting in ${}^{20}$Ne (7 - 10 MeV/nucleon) + ${}^{12}$C reactions
• Characterization of fragment emission in ^{20}Ne (7 - 10 MeV/nucleon) + ^{12}C reactions
• Complex fragment emission in low energy light-ion reactions
• Deep-inelastic multinucleon transfer processes in the ${}^{16}$O+${}^{27}$Al reaction
• Study of Dissipative Collisions of ${}^{20}$Ne ($\sim$7-11 MeV/nucleon) + ${}^{27}$Al