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Spectroscopy of the neutron-rich actinide nucleus U-240 following multinucleon-transfer reactions
Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany..
Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany..
Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany..
Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy.;Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy..
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2015 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 92, no 4, 044319Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 92, no 4, 044319
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Physical Sciences
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URN: urn:nbn:se:uu:diva-267205DOI: 10.1103/PhysRevC.92.044319ISI: 000363236900001OAI: oai:DiVA.org:uu-267205DiVA: diva2:872475
Available from: 2015-11-19 Created: 2015-11-19 Last updated: 2017-12-01Bibliographically approved

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Gengelbach, Aila

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