[Physicist]

In this case, were it not for space/time, subatomic decay would not be.

I'll stipulate that existence exists. <g>

The issue here is whether decay events could be specifically predicted, given complete (or at least sufficient) knowledge of the initial state. (Proximate cause, if you will.) The reality is that, in order for such a thing to be mathematically possible, decays would necessarily behave in a manner contrary to what is experimentally observed. At least some decays cannot have proximate causes.

[Alamo-Girl]

I'll stipulate that existence exists.

Thank you oh so very much for your reply and your stipulation! That is the point.

[Doctor Stochastic]

Material Causes need not be deterministic; Effective Causes have generally been held to be. Complete knowledge of a state may not tell one which subsequent event will take place (nor when, nor if.)