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Phys. Rev. C 73, 064309 (2006) [15 pages]

High-resolution study of 0+ and 2+ excitations in 168Er with the (p,t) reaction

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D. Bucurescu1,*, G. Graw2, R. Hertenberger2, H.-F. Wirth3, N. Lo Iudice4, A. V. Sushkov5, N. Yu. Shirikova5, Y. Sun6,7,8, T. Faestermann3, R. Krücken3, M. Mahgoub3, J. Jolie9, P. von Brentano9, N. Braun9, S. Heinze9, O. Möller9, D. Mücher9, C. Scholl9, R. F. Casten10, and D. A. Meyer10
1Horia Hulubei National Institute of Physics and Nuclear Engineering, P.O. Box MG-6, R-76900 Bucharest, Romania
2Sektion Physik, Ludwig Maximilians Universität München, Am Coulombwall 1, D-85748 Garching, Germany
3Physik Department, Technische Universität München, D-85748 Garching, Germany
4Dipartimento di Scienze Fisiche, Università di Napoli “Federico II” and Istituto Nazionale di Fisica Nucleare, Monte S Angelo, Via Cintia I-80126 Napoli, Italy
5Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
6Department of Physics and Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA
7Department of Physics, Tsinghua University, Beijing 100084, China
8Department of Physics, Xuzhou Normal University, Xuzhou, Jiangsu 221009, China
9Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
10Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8124, USA

Received 9 March 2006; published 29 June 2006

Excited states in the deformed nucleus 168Er have been studied with high-energy resolution, in the (p,t) reaction, with the Munich Q3D spectrograph. A number of 25 excited 0+ states (four tentative) and 63 2+ states have been assigned up to 4.0 MeV excitation energy. This unusually rich characterization of the 0+ and 2+ states in a deformed nucleus, close to a complete level scheme, offers a unique opportunity to check, in detail, models of nuclear structure that incorporate many excitation modes. A comparison of the experimental data is made with two such models: the quasiparticle-phonon model (QPM), and the projected shell model (PSM). The PSM wave functions appear to contain fewer correlations than those of the QPM and than required by the data.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.73.064309
DOI:
10.1103/PhysRevC.73.064309
PACS:
21.10.-k, 25.40.Hs, 27.70.+q, 21.60.-n

*Electronic address: bucurescu@tandem.nipne.ro

 
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