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Spectroscopy of the neutron-rich actinide nucleus U-240 following multinucleon-transfer reactions

AuthorsBirkenbach, B.; Vogt, A.; Geibel, K.; Recchia, F.; Gadea, Andrés ; Gengelbach, A.; Jungclaus, Andrea ; Korten, W.; Theisen, Ch.; Ur, C. A.; Vandone, V.; Wiens, A.
Issue Date21-Oct-2015
PublisherAmerican Physical Society
CitationPhysical Review C - Nuclear Physics 92: 044319 (2015)
AbstractBackground: 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: gamma-ray spectroscopy of neutron-rich heavy nuclei in the actinide region. Method: Multinucleon-transfer reactions in Zn-70 + U-238 and Xe-136 + U-238 have been measured in two experiments performed at the INFN Legnaro, Italy. In the Zn-70 experiment the high-resolution HPGe Clover Array (CLARA) coupled to the magnetic spectrometer PRISMA was employed. In the Xe-136 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 U-240 was measured up to the 20(+) level and a tentative assignment was made up to the (24(+)) level. Results from gamma gamma 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 U-240 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 K-pi = 0 band based on an octupole vibration. ©2015 American Physical Society
DescriptionB. Birkenbach et al.; 9 pags.; 9 figs.; 2 tabs.; PACS number(s): 23.20.Lv, 25.70.Hi, 27.90.+b, 29.40.Gx
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevC.92.044319
Identifiersdoi: 10.1103/PhysRevC.92.044319
issn: 0556-2813
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