Experimental cross sections of 165 Ho ( α , n ) 168 Tm and 166 Er ( α , n ) 169 Yb for optical potential studies relevant for the astrophysical γ process

J. Glorius, 2, ∗ K. Sonnabend, J. Görres, D. Robertson, M. Knörzer, A. Kontos, 6 T. Rauscher, 8 R. Reifarth, A. Sauerwein, E. Stech, W. Tan, T. Thomas, and M. Wiescher 6 Institut für Angewandte Physik, Goethe-Universität Frankfurt, Frankfurt am Main, Germany GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany Nuclear Science Laboratory, University of Notre Dame, Notre Dame, Indiana, USA Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan, USA Joint Institute for Nuclear Astrophysics, JINA Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, Hatfield AL10 9AB, United Kingdom Department of Physics, University of Basel, 4056 Basel, Switzerland (Dated: July 8, 2014)