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We propose helium-4 spallation processes induced by long-lived stau insupersymmetric standard models, and investigate an impact of the processes onlight elements abundances. We show that, as long as the phase space of helium-4spallation processes is open, they are more important than stau-catalyzedfusion and hence constrain the stau property.

Big-bang nucleosynthesis with a long-lived charged massive particle including $^4$He spallation processes