We discuss how matter-enhanced active-sterile neutrino transformation in the νₑνₛ and νₑνₛ channels could enable the production of the rapid neutron capture $(r$-process) nuclei in neutrino-heated supernova ejecta. In this scheme the lightest sterile neutrino would be heavier than the νₑ and split from it by a vacuum mass-squared difference of 3 eV²δmₑₛ²70 eV² with vacuum mixing angle sin²2θₑₛ>10^-4.
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McLaughlin et al. (1999) studied this question.
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