The European Physical Journal A

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

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Abstract Volume 1 Issue 1 (1998) pp 39-44

Study of the first-excited K^<pi>=0⁺ and 2⁺ bands in ²²⁸Th in the ²²⁶Ra(<alpha>,2n) reaction

T. Weber (1), J. Gröger (1), C. Günther (1), J. deBoer (2)

(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

Received: 11 August 1997 / Revised version: 19 September 1997

Abstract. Excited bands of ²²⁸Th were studied in the ²²⁶Ra(<alpha>,2n) reaction by gamma-ray and conversion-electron spectroscopy. The first-excited K^<pi>=0⁺ and 2⁺ bands were identified up to I^<pi> = 12⁺ and 10⁺, respectively. The spin dependence of the moments of inertia is discussed. The experimental data indicate a structural change of these bands from ²²⁸Th to ²³⁰Th and ²³²Th.

PACS: 21.10.Re Collective levels and giant resonances - 23.20.Lv Gamma transitions and level energies - 27.90.+b 220 \leq A

Communicated by D. Schwalm

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Online publication: January 23, 1998
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