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The possibility to observe quantum Zeno and anti-Zeno scenarios foratom-diatom reactive collisions is investigated for two diferent processes(F+HD and H+O_2) by means of time-dependent wave packet propagations. A novelapproach is proposed in which the survival probabilities investigated are thoseobtained when the initial state is redefined after time intervals tau at whichmeasurements are performed on the system. The comparison with the actualprobability for the unperturbed system reveals the existence of a regime inwhich the decay from the initial state appears to be inhibited (the quantumZeno effect) or accelerated (the anti-Zeno effect). In contrast with precedinginterpretations, given that the time-evolving wave packet is not affected atany time ("flying arrow"), the present procedure does not require to invoke tocounterintuitive hindered evolutions ("stopping arrow") to explain the results.On the contrary the consecutive update of the reference state of the systemsolves the apparent modern version of Zeno's paradox.

Revisiting Zeno's paradox: Flying arrows for atom-diatom reactions