The European Physical Journal A

ISSN: 1434-6001 (printed version)
ISSN: 1434-601X (electronic version)

Table of Contents

Abstract Volume 3 Issue 1 (1998) pp 25-48

nuclear structure: Nuclear levels in ²²⁸Th populated in the decay of ²²⁸Pa (II)

T. Weber (1), J. de Boer (2), K. Freitag (1), J. Gröger (1), C. Günther (1), P. Herzog (1), V.G. Soloviev (3), A.V. Sushkov (3), N.Yu. Shirikova (3)

(1) Institut für Strahlen- und Kernphysik, Universität Bonn, Nussallee 14-16, D-53115 Bonn, Germany
(2) Sektion Physik, Universität München, Am Coulombwall 1, D-85748 Garching, Germany
(3) Bogolubov Laboratory of Theoretical Physics, Joint Institute of Nuclear Research, 141980 Dubna, Russia

Received: 30 March 1998

Abstract: The electron-capture decay of ²²⁸Pa to levels in ²²⁸Th was studied using mass-separated sources and a <Gamma>-ray detection system consisting of five Compton-suppressed Ge detectors. A total of 87 levels were observed up to an excitation energy of 2 MeV which are connected by approximately 500 <Gamma>-ray transitions. The complete octupole quadruplet, three excited K^<pi>=0⁺ bands and two K^<pi>=2⁺ bands were identified below 1.4 MeV. The observed level structure is compared to calculations within the quasiparticle-phonon nuclear model. The surprisingly good agreement indicates that ²²⁸Th has less transitional character than hitherto assumed.

PACS: 23.20.-g Electromagnetic transitions - 21.60.Jz Hartree-Fock and random-physe approximations - 27.90.+b 220 \leq A

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Online publication: September 23, 1998
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