Physics

Electron

Fusion

Mechanics

Operating system

Coulomb barrier

Philosophy

Atomic physics

Nuclear physics

Trojan horse

Breakup

Computer science

Linguistics

Projectile

Quantum mechanics

Coulomb

Physical Review Letters

Experimental studies of nuclear collisions involving light weakly bound nuclei show a systematic suppression of the complete fusion cross section by ∼30% with respect to the expectation for tightly bound nuclei, at energies above the Coulomb barrier. Although it is widely accepted that the phenomenon is related to the weak binding of these nuclei, the origin of this suppression is not fully understood. Here, we present a novel approach that provides the complete fusion for weakly bound nuclei and relates its suppression to the competition between the different mechanisms contributing to the reaction cross section. The method is applied to the ^{6,7}Li+^{209}Bi reactions, where we find that the suppression of complete fusion is mostly caused by the flux associated with nonelastic breakup modes, such as the partial capture of the projectile (incomplete fusion), whereas the elastic breakup mode is found to play a minor role. Finally, we demonstrate that the large α yields observed in these reactions can be naturally explained as a consequence of a Trojan Horse mechanism.

Puzzle of Complete Fusion Suppression in Weakly Bound Nuclei: A Trojan Horse Effect?