More or less. Sometimes they will have intermediates, which then decay, and then those products decay, and so on. That's quite common. Eventually they just .

More or less. Sometimes they will have intermediates, which then decay, and then those products decay, and so on. That's quite common. Eventually they just ... fall apart. The more options, the faster. The greater the energy stepdown, the faster, by which I mean "can it release a gamma? Or fall apart into some much smaller things?" However, it is independent of "nearby" structure, where nearby is any distance larger than the nucleus. So, no, we cannot contain these particles within anything to prevent their decay, it is like trying to build a bouncy castle around a hand grenade in hopes that it won't go off. Note that there is an apparent delay in decay, from our perspective, when particles are moving very fast, like a relativistic muon lasting longer (although still a very brief period of time by our standards) than expected, simply due to special relativity. But here this also would not help. Things fall apart, the center cannot hold, and so on.