Evidence for Coexisting Shapes through Lifetime Measurements in Zr98
| Autor: | M. D. Salsac, W. Rother, F. Recchia, Alfred Dewald, Nathalie Pillet, Andreas Görgen, Jean Paul Delaroche, C. Michelagnoli, M. Hackstein, C. Louchart, C. Müller-Gatermann, B. Bruyneel, W. Korten, J. Libert, Igor T. Čeliković, A. Dijon, Trine Wiborg Hagen, Bertrand Jacquot, J. Ljungvall, Emmanuel Clément, F. Farget, Takaharu Otsuka, C Theisen, D. R. Napoli, B. Sulignano, J. Litzinger, Purnima Singh, Jose Javier Valiente-Dobón, E. Sahin, Tomoaki Togashi, L. Grente, Yuhsuke Tsunoda, O. Delaune, Thomas Braunroth, A. Gottardo, Sunniva Siem, Michel Girod |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 121 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.121.192501 |
| Popis: | The lifetimes of the first excited 2^{+}, 4^{+}, and 6^{+} states in ^{98}Zr were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in ^{98}Zr were populated using the fission reaction between a 6.2 MeV/u ^{238}U beam and a ^{9}Be target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2;2_{1}^{+}→0_{1}^{+}) value in ^{98}Zr, thereby confirming the very sudden onset of collectivity at N=60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state. |
| Databáze: | OpenAIRE |
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