A continuation of the demonstration that the nuclides existing on Earth arose as a result of LENR processes, which involve interactions between two identical, closely spaced isotopes considered as bound oscillators. This situation arises during sudden and strong compression of a gas by circulating light, causing the gas atoms to become densely packed. The exchange of energy between the bound oscillators creates an instability, leading to LENR with nucleon exchange between nuclei ( LENREN ). It has been shown that such reactions, in particular, produce isotopes that are unable to undergo further reactions and gradually accumulate over time. The proportion of such isotopes in the Earth's crust is approximately 90%, although their abundance does not exceed a few percent. However, LENREN reactions cannot occur with isotopes whose mass number A is greater than 98. It is shown that all isotopes can be divided into 3 groups with mass numbers A 1, A 2, A 3, where 1 <= A 1 <= 98 < A 2 <= 146 < A 3 <= 238. LENREN during exchange between two identical isotopes cannot occur with isotopes from the second group, but they can occur in the case when 3 oscillators are bound. Although the probability of the formation of a trio of bound oscillators is orders of magnitude lower, the percentage content of the isotopes resulting from this in the earth's crust is also orders of magnitude lower. Among the 20 most common isotopes in the earth's crust, only barium isotopes belong to the isotopes from the second group. Three Appendices present the chains of isotopes resulting from LENREN in each of the three indicated groups.
Torchigin V. P. (Tue,) studied this question.