Nucleosynthesis within dying low mass stars...N->Sr gap???

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https://eu.ixquick-proxy.com/do/spg/show_picture.pl?l=english&rais=1&oiu=http%3A%2F%2Fblog.sdss.org%2Fwp-content%2Fuploads%2F2017%2F01%2Fperiodic_table.png&sp=08502e61827bb82d6709f757e91c3cd9

Why is there a gap between Nitrogen 7 and Strontium 38 with respect to nucleosynthesis within dying low mass stars?

Dying low mass stars fuse He, Li, C and N but do not fuse O ----> Rb....then they can fuse from Sr 38 ---->Bi 83.

Why the gap?

Prolly a dumb question, but hey.

Aliens did it?

My guess on this question is that there is likely a competing nuclear process that absorbs the lower isotopes to form the heavier allowed ones, creating a missing zone of isotopes within the star. Think of it as a form of reverse nuclear fission with very specific yields (low byproducts). It could even require three or more parent nuclei to make the larger daughter. If it does actually happen, it would potentially give a route to skip over certain elements during nuclear conversions.

Stars are basically different types of "furnaces" or matter factories operating at different temperatures and two types of matter works differently at different temperatures so they can fuse or change, other factors are gravity and pressure.

Implosion/explosions are extreme events that create other things, i know from earlier that gold isn't produced normally within a star, it is only created when it goes boom. There should be a large variety of the matter being produced in these factories since we have a bunch of star types (O,B,A,F,G,K,M... etc).

Interesting chart, i wonder how they came up with that (Spectrography?)

Btw: here is a better link:
http://blog.sdss.org/wp-content/uploads/2017/01/periodic_table.png