Observation of low- and high-energy gamow-teller phonon excitations in nuclei

Y. Fujita, H. Fujita, T. Adachi, C. L. Bai, A. Algora, G. P. A. Berg, P. von Brentano, G. Colo, M. Csatlos, J. M. Deaven, E. Estevez-Aguado, C. Fransen, D. De Frenne, K. Fujita, E. Ganioglu, C. J. Guess, J. Gulyas, K. Hatanaka, K. Hirota, M. Honma, D. Ishikawa, E. Jacobs, A. Krasznahorkay, H. Matsubara, K. Matsuyanagi, R. Meharchand,9,∥ F. Molina, K. Muto, K. Nakanishi, A. Negret, H. Okamura, H. J. Ong, T. Otsuka, N. Pietralla, G. Perdikakis, L. Popescu, B. Rubio, H. Sagawa, P. Sarriguren, C. Scholl, Y. Shimbara, Y. Shimizu,1,∥∥G. Susoy, T. Suzuki, Y. Tameshige, A. Tamii, J. H. Thies, M. Uchida, T. Wakasa, M. Yosoi, R. G. T. Zegers, K. O. Zell, and J. Zenihiro1,∥∥ Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan Department of Physics, Sichuan University, Chengdu 610065, China Instituto de Fisica Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain Institute for Nuclear Research (MTA-Atomki), H-4001 Debrecen, Post Office Box 51, Hungary Department of Physics and JINA, University of Notre Dame, Notre Dame, Indiana 46556, USA Institut fur Kernphysik, Universitat zu Koln, D-50937 Koln, Germany Dipartimento di Fisica, Universita degli Studi di Milano, and INFN, Sezione di Milano, via Celoria 16, 20133 Milano, Italy National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA Vakgroep Subatomaire en Stralingsfysica, Universiteit Gent, B-9000 Gent, Belgium Department of Physics, Istanbul University, Istanbul 34134, Turkey Center for Mathematical Sciences, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8580, Japan RIKEN, Nishina Center, Wako Saitama 351-0198, Japan Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan Department of Physics, Tokyo Institute of Technology, Ohokayama, Meguro, Tokyo 152-8551, Japan Horia Hulubei National Institute for Physics and Nuclear Engineering, 077125 Bucharest-Magurele, Romania Department of Physics, University of Tokyo, Hongo, Bunkyo, Tokyo 113-0033, Japan Department of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859, USA SCK-CEN, Belgian Nuclear Research Center, B-2400 Mol, Belgium Instituto de Estructura de la Materia, IEM-CSIC, Serrano 123, E-28006 Madrid, Spain Graduate School of Science and Technology, Niigata University, Nishi, Niigata 950-2181, Japan Institut fur Kernphysik, Westfalische Wilhelms-Universitat, D-48149 Munster, Germany (Received 29 January 2014; published 18 March 2014)