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Phys. Rev. C 75, 014311 (2007) [13 pages]

Damping mechanisms of high-lying single-particle states in 91Nb

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H. K. T. van der Molen1, H. Akimune2, A. M. van den Berg1, I. Daito2, H. Fujimura2, Y. Fujita3, M. Fujiwara2,4, M. N. Harakeh1,*, M. Hunyadi1,†, F. Ihara2, T. Inomata2, K. Ishibashi2, J. Jänecke5, N. Kalantar-Nayestanaki1, H. Laurent6, I. Lhenry6, T. W. O'Donnell5, V. A. Rodin1,7, A. Tamii8, H. Toyokawa9, M. H. Urin1,7, H. Yoshida2, and M. Yosoi2
1Kernfysisch Versneller Instituut (KVI), University of Groningen, 9747 AA Groningen, The Netherlands
2Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
3Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
4Advanced Science Research Center, JAERI, Tokai, Ibaraki 319-1195, Japan
5Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
6Institut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, France
7Department of Theoretical Nuclear Physics, MEPI, RU-115409 Moscow, Russia
8Department of Physics, Kyoto University, Sakyo, Kyoto 606-8224, Japan
9SPring-8, Japan Synchrotron Research Institute, Hyogo 679-5198, Japan

Received 26 September 2006; published 18 January 2007

Decay by proton emission from high-lying states in 91Nb, populated in the 90Zr(α,t) reaction at Eα=180 MeV, has been investigated. Decay to the ground state and semidirect decay to the low-lying (2+,5-, and 3-) phonon states in 90Zr were observed. It was found that these phonon states play an important role in the damping process of the single-particle states. An optical-model coupled-channel approach was used successfully to describe the direct and semidirect parts of the decay.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.75.014311
DOI:
10.1103/PhysRevC.75.014311
PACS:
25.55.Hp, 23.50.+z, 21.10.Pc, 27.60.+j

*Corresponding author. Electronic mail: harakeh@kvi.nl

†Present address: Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, Hungary.

 
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