Trying to write nuclear reactions edit

Here is an interesting reaction: (using <chem>):

 

Using <chem> and nuclear reaction notation:

 

Using <chem> and nuclear reaction notation, no arrows:

 
Fails because \text command messes up. No decent docu available for <chem>.

Simple line, using Nuclide and Subatomic particle (no halflives):

230
90
Th
(n,
γ
) 231
90
Th
(
β
) 231
91
Pa
(n,
γ
) 232
91
Pa
(
β
) 232
92
U

Simple line, using Nuclide and Subatomic particle (with halflives):

230
90
Th
(n,
γ
) 231
90
Th
(
β
[25.5 h]) 231
91
Pa
(n,
γ
) 232
91
Pa
(
β
[1.3 d]) 232
92
U