t p
A homogeneous nuclear reaction is a reaction in which the conditions required for the implementation of nuclear transformations are fulfilled for all atoms of the substance participating in the reaction simultaneously.
In fusion reactions, a homogeneous reaction is possible when the Lawson criterion is reached.
In fission reactions, a homogeneous reaction is possible from metastable states of nuclei:
I 0 → I 01 = Σ I i + Σ @ j ± Q,
where I 0 and I 01 are different states of the same atomic nucleus, Σ I i are the nuclei formed as a result of the fission reaction of the original nucleus, Σ @ j are all elementary particles released in the reaction (@ is an arbitrary elementary particle), Q is the kinetic energy of the reaction products, I 0 is a metastable state.
In a particular case, the equation of a homogeneous nuclear fission reaction from the metastable state of an excited nucleus I im.st. can be written, for example, in the following form:
I im.st. + ∆E → I ip + @ → I j = Σ I k + Σ @ j ± Q, where I ip - P the state of the core I i with a lifetime t p << t m.st.
If ∆E is small enough, then the last reaction can be initiated by a simple blow.
PS In the notation used, the nuclear chain reaction: I 0 ± @ = I 1 + I 2 + n · @ ± Q, n> 1.