Shape evolution in 116,118Ru: Triaxiality and transition between the O(6) and U(5) dynamical symmetries

P.-A. Söderström,1,* G. Lorusso,1 H. Watanabe,1,2 S. Nishimura,1 P. Doornenbal,1 G. Thiamova,3 F. Browne,1,4 G. Gey,1,3 H. S. Jung,5 T. Sumikama,6 J. Taprogge,1,7,8 Zs. Vajta,1,9 J. Wu,1,10 Z. Y. Xu,11 H. Baba,1 G. Benzoni,12 K. Y. Chae,13 F. C. L. Crespi,12,14 N. Fukuda,1 R. Gernhäuser,15 N. Inabe,1 T. Isobe,1 A. Jungclaus,8 D. Kameda,1 G. D. Kim,16 Y.-K. Kim,16,17 I. Kojouharov,18 F. G. Kondev,19 T. Kubo,1 N. Kurz,18 Y. K. Kwon,16 G. J. Lane,20 Z. Li,21 A. Montaner-Pizá,22 K. Moschner,23 F. Naqvi,24 M. Niikura,11 H. Nishibata,25 A. Odahara,25 R. Orlandi,26 Z. Patel,27 Zs. Podolyák,27 H. Sakurai,1,11 H. Schaffner,18 G. S. Simpson,3 K. Steiger,15 H. Suzuki,1 H. Takeda,1 A. Wendt,23 A. Yagi,25 and K. Yoshinaga28 1RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan 2Department of Physics, Beihang University, Beijing 100191, China 3LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France 4School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4JG, United Kingdom 5Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea 6Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan 7Departamento de Fı́sica Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain 8Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain 9Institute for Nuclear Research, Hungarian Academy of Sciences, P. O. Box 51, Debrecen, H-4001, Hungary 10Department of Physics, Peking University, Beijing 100871, China 11Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan 12INFN Sezione di Milano, I-20133 Milano, Italy 13Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea 14Dipartimento di Fisica, Università di Milano, I-20133 Milano, Italy 15Physik Department E12, Technische Universität München, D-85748 Garching, Germany 16Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea 17Department of Nuclear Engineering, Hanyang University, Seoul 133-791, Republic of Korea 18GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany 19Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA 20Department of Nuclear Physics, R.S.P.E., Australian National University, Canberra, A.C.T. 0200, Australia 21School of Physics, Peking University, Beijing 100871, China 22Instituto de Fı́sica Corpuscular, CSIC-University of Valencia, E-46980 Paterna, Spain 23Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany 24Wright Nuclear Structure Laboratory, Yale University, New Haven, , USA 25Department of Physics, Osaka University, Machikaneyama-machi 1-1, Toyonaka, Osaka 560-0043, Japan 26Instituut voor Kern en Stralingsfysica, KU Leuven, University of Leuven, B-3001 Leuven, Belgium 27Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom 28Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan