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

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: 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.
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Contributor : Emilie Bonnardel <>
Submitted on : Tuesday, November 24, 2015 - 11:27:05 AM
Last modification on : Monday, February 10, 2020 - 6:14:09 PM

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B. Birkenbach, A. Vogt, K. Geibel, F. Recchia, P. Reiter, et al.. Spectroscopy of the neutron-rich actinide nucleus U-240 following multinucleon-transfer reactions. Physical Review C, American Physical Society, 2015, 92 (issue 4), pp.044319. ⟨10.1103/PhysRevC.92.044319⟩. ⟨in2p3-01232843⟩



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