discrete states in 90 Zr populated via the ( 17 O , 17 O ′ γ ) reaction

F. C. L. Crespi,1,2 A. Bracco,1,2,* R. Nicolini,1,2 E. G. Lanza,3 A. Vitturi,4,5 D. Mengoni,4,5 S. Leoni,1,2 G. Benzoni,2 N. Blasi,2 C. Boiano,2 S. Bottoni,1,2 S. Brambilla,2 F. Camera,1,2 A. Corsi,1,2,† A. Giaz,2 B. Million,2 L. Pellegri,1,2 V. Vandone,1,2 O. Wieland,2 P. Bednarczyk,6 M. Ciemała,6,‡ M. Kmiecik,6 M. Krzysiek,6 A. Maj,6 D. Bazzacco,5 M. Bellato,5 B. Birkenbach,7 D. Bortolato,4,5 E. Calore,8 B. Cederwall,9 G. de Angelis,8 P. Désesquelles,10 J. Eberth,7 E. Farnea,5 A. Gadea,11 A. Görgen,12 A. Gottardo,4,8 H. Hess,7 R. Isocrate,5 J. Jolie,7 A. Jungclaus,13 R. S. Kempley,14 M. Labiche,15 R. Menegazzo,5 C. Michelagnoli,4,5,§ P. Molini,8 D. R. Napoli,8 A. Pullia,1,2 B. Quintana,16 F. Recchia,4,5 P. Reiter,7 E. Sahin,8,‖ S. Siem,12 P.-A. Söderström,17,¶ O. Stezowski,18 Ch. Theisen,19 C. Ur,5 and J. J. Valiente-Dobón8 1Dipartimento di Fisica dell’Università degli Studi di Milano, I-20133 Milano, Italy 2INFN, Sezione di Milano, I-20133 Milano, Italy 3INFN, Sezione di Catania, I-95123 Catania, Italy 4Dipartimento di Fisica dell’Università degli Studi di Padova, I-35131 Padova, Italy 5INFN, Sezione di Padova, I-35131 Padova, Italy 6The Niewodniczanski Institute of Nuclear Physics, PAN, 31-342 Krakow, Poland 7Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany 8INFN, Laboratori Nazionali di Legnaro, Legnaro I-35020, Italy 9Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden 10Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse CSNSM, CNRS/IN2P3, and Université Paris-Sud, F-91405 Orsay Campus, France 11IFIC, CSIC-Universitat de València, E-46980 València, Spain 12Department of Physics, University of Oslo, N-0316 Oslo, Norway 13Instituto de Estructura de la Materia, CSIC, Madrid, E-28006 Madrid, Spain 14Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom 15STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom 16Laboratorio de Radiaciones Ionizantes, University of Salamanca, E-37008 Salamanca, Spain 17Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden 18Université de Lyon, Université Lyon 1, CNRS-IN2P3, Institut de Physique Nucléaire de Lyon, F-69622 Villeurbanne, France 19Institut de Recherche sur les lois Fondamentales de l’Univers IRFU, CEA/DSM, Centre CEA de Saclay, F-91191 Gif-sur-Yvette Cedex, France (Received 9 December 2014; revised manuscript received 20 January 2015; published 24 February 2015)