Re: Chart of Nuclides Question

[MCNAUGHT@lanl.gov (Mike McNaughton)]

>On the GE chart of the nuclides a black triangle in the lower
>right corner indicates a fission product. There are some
>nuclides that have a black square in the lower right corner,
>e.g.  Eu-154, Pm -150 and Cs-136. It is not explained in the
>symbols section. What does this square indicate?
>
>Luke McCormick
>luke.mccormick@mrd01.usace.army.mil

These are nuclides that are "blocked" by a stable nucleus, for example Rb-86
is blocked by Kr-86. They are odd-odd nuclides that are blocked by even-even
nuclides.  Se-82 is an interesting case; it cannot decay to Br-82 because it
has less mass, but it emits 2 betas simultaneously to decay to Kr-82.
Shlala gashle, mike