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Investigation of lifetimes in quadrupole bands of 142Gd |
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| Authors: | E. O. Lieder A. A. Pasternak R. M. Lieder A. D. Efimov V. M. Mikhajlov B. G. Carlsson I. Ragnarsson W. Gast Ts. Venkova T. Morek S. Chmel G. de Angelis D. R. Napoli A. Gadea D. Bazzacco R. Menegazzo S. Lunardi W. Urban Ch. Droste T. Rzaca-Urban G. Duchêne A. Dewald |
| Affiliation: | 1. Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany 2. iThemba LABS, P.O. Box 722, 7129, Somerset West, South Africa 3. A.F. Ioffe Physical Technical Institute RAS, RU-194021, St. Petersburg, Russia 4. Physical Institute, St. Petersburg State University, RU-198904, St. Petersburg, Russia 5. Division of Mathematical Physics, LTH, Lund University, SE-221 00, Lund, Sweden 6. Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, BG-1784, Sofia, Bulgaria 7. Institute of Experimental Physics, University of Warsaw, PL-00-681, Warszawa, Poland 8. Institut für Strahlen- und Kernphysik, University of Bonn, D-53115, Bonn, Germany 9. Laboratori Nazionali di Legnaro, Istituto Nazionale di Fisica Nucleare, I-35020, Legnaro, Italy 10. Dipartimento di Fisica dell'Università and Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131, Padova, Italy 11. Institut de Recherches Subatomique IReS, F-67037, Strasbourg, France 12. Institut für Kernphysik, Universit?t zu K?ln, D-50937, K?ln, Germany |
| Abstract: | For a level scheme investigation of 142Gd an experiment with the γ -spectrometer EUROBALLIII has been carried out and lifetimes have been measured with EUROBALL IV using the Doppler-shift attenuation method. The high-spin states have been populated in these experiments by means of the 99Ru(48Ti, 2p3n) reaction at a beam energy of 240MeV and the 114Sn(32S, 2p2n) reaction at 160MeV, respectively. Reduced E2 transition probabilities B(E2) were determined for 15 members of four quadrupole bands. For the interpretation of the positive-parity even-spin quadrupole bands, calculations in the cranked Nilsson-Strutinsky as well as interacting boson models have been performed. From the former calculations it was concluded that the high-spin states of the (+ , 0)1 band in 142Gd represent a triaxial nucleus rotating around the longest principal axis. |
| Keywords: | 21.10.-k Properties of nuclei nuclear energy levels 21.10.Re Collective levels 21.10.Tg Lifetimes, widths 27.60.+j 90 ⩽ A ⩽ 149 |
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