If there are enough immediate decays to carry on the chain reaction, the mass is said to be prompt critical, and the energy release will grow rapidly and uncontrollably, usually leading to an explosion.
A fal ti illa markah daɣ armud fal chain reaction, takunkut atwan atmaxitir tolas azajor n enerji ad iw-ad daɣ armud d iban tudabat n awakkil har id aru abuqqi