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.
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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