tokens: This research was financed by the Swiss National Science Foundation project 200021_149865. V.d.F. and M.F. acknowledge the Department of Physics at the University of Basel and especially Friedrich-K. Thielemann. We also thank the International Space Science Institute in Bern for their support. V.d.F. is grateful to the International Space Science Institute in Beijing for the hospitality to carry out part of this work. L.S. acknowledges partial support under contract ASI INAF I/004/11/1.
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