Background: Nuclear structure information for the neutron-rich actinide nuclei is important since it is the benchmark for theoretical models that provide predictions for the heaviest nuclei. Purpose: γ-ray spectroscopy of neutron-rich heavy nuclei in the actinide region. Method: Multinucleon-transfer reactions in Zn70+U238 and Xe136+U238 have been measured in two experiments performed at the INFN Legnaro, Italy. In the Zn70 experiment the high-resolution HPGe Clover Array (CLARA) coupled to the magnetic spectrometer PRISMA was employed. In the Xe136 experiment the high-resolution Advanced Gamma Tracking Array (AGATA) was used in combination with PRISMA and the Detector Array for Multinucleon Transfer Ejectiles (DANTE). Results: The ground-state band (g.s. band) of U240 was measured up to the 20+ level and a tentative assignment was made up to the (24+) level. Results from γγ coincidence and from particle coincidence analyses are shown. Moments of inertia (MoI) show a clear upbend. Evidence for an extended first negative-parity band of U240 is found. Conclusions: A detailed comparison with latest calculations shows best agreement with cranked relativistic Hartree-Bogoliubov (CRHB) calculations for the g.s. band properties. The negative-parity band shows the characteristics of a Kπ=0- band based on an octupole vibration.
Spectroscopy of the neutron-rich actinide nucleus U 240 following multinucleon-transfer reactions / B. Birkenbach, A. Vogt, K. Geibel, F. Recchia, P. Reiter, J.J. Valiente Dobón, D. Bazzacco, M. Bowry, A. Bracco, B. Bruyneel, L. Corradi, F.C.L. Crespi, G. De Angelis, P. Désesquelles, J. Eberth, E. Farnea, E. Fioretto, A. Gadea, A. Gengelbach, A. Giaz, A. Görgen, A. Gottardo, J. Grebosz, H. Hess, P.R. John, J. Jolie, D.S. Judson, A. Jungclaus, W. Korten, S. Lenzi, S. Leoni, S. Lunardi, R. Menegazzo, D. Mengoni, C. Michelagnoli, T. Mijatović, G. Montagnoli, D. Montanari, D. Napoli, L. Pellegri, G. Pollarolo, A. Pullia, B. Quintana, F. Radeck, D. Rosso, E. Şahin, M.D. Salsac, F. Scarlassara, P. Söderström, A.M. Stefanini, T. Steinbach, O. Stezowski, S. Szilner, B. Szpak, C. Theisen, C. Ur, V. Vandone, A. Wiens. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 92:4(2015), pp. 044319.1-044319.9. [10.1103/PhysRevC.92.044319]
Spectroscopy of the neutron-rich actinide nucleus U 240 following multinucleon-transfer reactions
A. Bracco;F.C.L. Crespi;A. Giaz;S. Leoni;L. Pellegri;A. Pullia;V. Vandone;
2015
Abstract
Background: Nuclear structure information for the neutron-rich actinide nuclei is important since it is the benchmark for theoretical models that provide predictions for the heaviest nuclei. Purpose: γ-ray spectroscopy of neutron-rich heavy nuclei in the actinide region. Method: Multinucleon-transfer reactions in Zn70+U238 and Xe136+U238 have been measured in two experiments performed at the INFN Legnaro, Italy. In the Zn70 experiment the high-resolution HPGe Clover Array (CLARA) coupled to the magnetic spectrometer PRISMA was employed. In the Xe136 experiment the high-resolution Advanced Gamma Tracking Array (AGATA) was used in combination with PRISMA and the Detector Array for Multinucleon Transfer Ejectiles (DANTE). Results: The ground-state band (g.s. band) of U240 was measured up to the 20+ level and a tentative assignment was made up to the (24+) level. Results from γγ coincidence and from particle coincidence analyses are shown. Moments of inertia (MoI) show a clear upbend. Evidence for an extended first negative-parity band of U240 is found. Conclusions: A detailed comparison with latest calculations shows best agreement with cranked relativistic Hartree-Bogoliubov (CRHB) calculations for the g.s. band properties. The negative-parity band shows the characteristics of a Kπ=0- band based on an octupole vibration.
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