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Phys. Rev. C 70, 064321 (2004) [4 pages]

E2 excitation strength in 55Ni : Coupling of the 56Ni  21+ collective core vibration to the f7∕2 odd neutron hole

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K. L. Yurkewicz1,2, D. Bazin1, B. A. Brown1,2, C. M. Campbell1,2, J. A. Church1,2 *, D.-C. Dinca1,2, A. Gade1, T. Glasmacher1,2, M. Honma3, T. Mizusaki4, W. F. Mueller1, H. Olliver1,2, T. Otsuka5,6, L. A. Riley7, and J. R. Terry1,2
1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
3Center for Mathematical Sciences, University of Aizu, Tsuruga, Ikki-machi, Aizu-Wakamatsu, Fukushima 965-8580, Japan
4Institute of Natural Sciences, Senshu University, Higashimita, Tama, Kawasaki, Kanagawa 214-8580, Japan
5Department of Physics and Center for Nuclear Study, University of Tokyo, Hongo, Tokyo 113-0033, Japan
6RIKEN, Hirosawa, Wako-shi, Saitama 351-0198, Japan
7Department of Physics and Astronomy, Ursinus College, Collegeville, Pennsylvania 19426, USA

Received 6 August 2004; published 27 December 2004

The collectivity of the odd-mass nucleus 55Ni was explored via intermediate-energy Coulomb excitation using a powerful combination of particle and γ -ray spectroscopy. A γ -ray at 2879(18) keV was observed and is interpreted to deexcite a member of the core-coupled quintuplet 21+(56Ni)⊗νf7∕2−1 at the same energy. By similarity with the mirror nucleus 55Co , transition probabilities were calculated assuming Jπ=9∕2− and Jπ=11∕2− for this state. Both assumptions lead to a transition strength higher than predicted by a large-scale shell-model calculation using the GXPF1 effective interaction and exceed the value predicted within a simple weak-coupling approach.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.70.064321
DOI: 10.1103/PhysRevC.70.064321
PACS: 27.40.+z, 25.70.De, 23.20.Lv, 23.20.Js

* Present address: Lawrence Livermore National Laboratory, Livermore, CA 94550.

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