excited U-236 decay time in the U235 fission chain
I'm trying to pin down the time of U-236 decay in the U-235 fission reaction chain. I've seen numbers between 10^-12 and 10^-9 and am wondering where it actually lies. According to my calculations it would have to be essentially less than 10^-9 to get explosions just relying on critical mass. Thanks in advance.