Illustration of initial terms on one of views of a three-dimensional shell model of nucleus.
.
. |---------------------- i ----------------------|
. | |
. | |------------------ h ------------------| |
. | | | |
. | | |-------------- g --------------| | |
. | | | | | |
. | | | |---------- f ----------| | | |
. | | | | | | | |
. | | | | |------ d ------| | | | |
. | | | | | | | | | |
. | | | | | |-- p --| | | | | |
. | | | | | | | | | | | |
. | | | | | | s | | | | | |
. | | | | | | | | | | | | |
. | | | | | | | | | | | | |
. | | | | | | 2 | | | | | |
. | | | | | 4 | | | | | | |
. | | | | | | | 2 | | | | |
. | | | | 6 | | | | | | | |
. | | | | | | 2 | | | | | |
. | | | | | | | | 4 | | | |
. | | | 8 | | | | | | | | |
. | | | | | 4 | | | | | | |
. | | | | | | | | | 6 | | |
. | | | | | | | 2 | | | | |
. | | 10 | | | | | | | | | |
. | | | | | | | | | | 8 | |
. | | | | 6 | | | | | | | |
. | 12 | | | | | | | | | | |
. | | | | | | | | 4 | | | |
. | | | | | | 2 | | | | | |
. | | | 8 | | | | | | | | |
. | | | | | | | | | | | 10 |
. 14 | | | | | | | | | | | |
. | | | | | 4 | | | | | | |
. | | | | | | | | | 6 | | |
. | | | | | | | 2 | | | | |
. | | | | | | | | | | | | |
. | | | | | | | | | | | | |
. | | | | | | |1/2| | | | | |
. | | | | | | | | | | |
. | | | | | |----3/2----| | | | |
. | | | | | | | | |
. | | | | |--------5/2--------| | | |
. | | | | | | |
. | | | |------------7/2------------| | |
. | | | | |
. | | |----------------9/2----------------| |
. | | | |
. | |-------------------11/2--------------------|
. |
. |-----------------------13/2------------------------
.
For another view of the model see the example section of A212122, second part.
Written as an irregular triangle in which row n represents the n-th shell of nucleus. Note that row 4 has only one term. Triangle begins:
2;
4, 2;
6, 2, 4;
8;
4, 6, 2, 10;
8, 6, 12, 4, 2;
8, 10, 14, 4, 6, 2;
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