Part 3/10:
This unexpected data led Oppenheimer to summon an emergency meeting. The gun-type bomb design, which the team had been developing, was rendered unfeasible. Under the assumption of critical mass assembly through high-velocity impacts, the spontaneous fission rate of the new plutonium samples posed a severe threat of predetonation. The simple act of rapidly merging two plutonium masses risked transforming the bomb into a catastrophic failure.