Mixed-symmetry octupole and hexadecapole excitations in the N = 52 isotones

Mixed-symmetry octupole and hexadecapole excitations in the N = 52 isotones A. Hennig,1,* M. Spieker,1 V. Werner,2,3 T. Ahn,2,† V. Anagnostatou,2,4 N. Cooper,2 V. Derya,1 M. Elvers,1,2 J. Endres,1 P. Goddard,2,4 A. Heinz,2,5 R. O. Hughes,2,6 G. Ilie,2,7 M. N. Mineva,8 P. Petkov,1,8 S. G. Pickstone,1 N. Pietralla,3 D. Radeck,1,2 T. J. Ross,4,6 D. Savran,9,10 and A. Zilges1 1Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany 2Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA 3Institut für Kernphysik, Technische Universität Darmstadt, D-6489 Darmstadt, Germany 4Department of Physics, University of Surrey, Guildford GU2 7XH, UK 5Fundamental Fysik, Chalmers Tekniska Högskola, SE-41296 Göteborg, Sweden 6University of Richmond, Richmond, Virginia 23173, USA 7National Institute for Physics and Nuclear Engineering, Bucharest-Magurele, RO-77125, Romania 8Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria 9ExtreMe Matter Institute EMMI and Research Division, GSI, D-64291 Darmstadt, Germany 10Frankfurt Institute for Advanced Studies FIAS, D-60438 Frankfurt a.M., Germany (Received 18 August 2014; published 11 November 2014)