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Several nuclear reactions involving the 7 Be nucleus, not included into the standard model of the pp-chain, are discussed. A qualitative analysis of their possible influence on the fate of the 7 Be in solar plasma and of their role in the interpretation of the solar neutrino experiments is given. As an example, the reaction rate of the nonradiative production of 8 B in the triple collision p + e − + 7 Be → 8 B+e − is estimated in the framework of the adiabatic approximation. For the solar interior conditions the triple collision reaction rate is approximately 10 −4 of that for the binary process p + 7 Be → 8 B + γ. [PACS numbers: 21.45.+v, 97.10.Cv]

We calculated the energy and the size of the three-deuteron muonic molecule (3d 2e − µ − ) = D 3 µ. It turns out that this system possesses two equilibrium positions, one at distances typical for muonic molecules and a second one at the usual molecular size. We show, moreover, that the fusion probability of the three deuterons is considerably enhanced due to the existence of a 6 Li * threshold resonance. Our estimates indicate that this probability is considerably higher than the decay rate of the competing Auger transition.

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We consider several nuclear fusion reactions that take place at the center of the sun, which are omitted in the standard pp-chain model. More specifically the reaction rates of the nonradiative production of 3 He, 7 Be, and 8 B nuclei in triple collisions involving electrons are estimated within the framework of the adiabatic approximation. These rates are compared with those of the corresponding binary fusion reactions.I.

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