The European Physical Journal A

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

Table of Contents

Abstract Volume 2 Issue 3 (1998) pp 253-261

nuclear structure: Collective excitations built on the 2⁺_<Gamma> state in ¹⁶⁸Er

T. Härtlein (1), M. Heinebrodt (1) (*), D. Schwalm (1), C. Fahlander (2)

(1) Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
(2) Division of Cosmic and Subatomic Physics, Lund University, S-22100 Lund, Sweden

Received: 25 February 1998

Abstract: To examine the collectivity of the previously proposed K^<pi>=4⁺ <Gamma><Gamma>-two-phonon state in ¹⁶⁸Er at an excitation energy of 2056 keV and of the first excited K^<pi>=0⁺ band at 1217 keV (b-band), a Coulomb excitation experiment has been carried out at the Heidelberg-Darmstadt Crystal Ball spectrometer. The B(E2) value connecting the 4⁺_{<Gamma><Gamma>} state to the <Gamma>-band was remeasured to be B(E)2,4⁺_{<Gamma><Gamma>} -> 2⁺_<Gamma>)=(600± 130) e²fm⁴, which almost exhausts the harmonic expectation. In addition, the B(E2) values connecting the band head of the lowest lying excited 0⁺_b band to the 2⁺_g and 2⁺_<Gamma> states were measured to be B(E2,2⁺_g -> 0⁺_b)=(4.4±0.6) e²fm⁴ and B(E2, 2⁺_<Gamma> -> 0⁺_b)=(30.4±4.6) e²fm⁴; the latter is almost a factor of 10 smaller than the B(E2,2⁺_<Gamma> -> 0⁺_g) value, which shows that the 0⁺_b band head has no significant contribution of the K^<pi> = 0⁺ <Gamma><Gamma>-two-phonon state in its wave function.

PACS: 21.10.Re Collective levels and giant resonances - 23.20.Ck Lifetimes and transition probabilities - 25.70.Cd Elastic and quasielastic scattering and transfer - 27.70.+q 150 \leq A \leq 189

(*) Present address: Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany
Communicated by B. Povh

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Online publication: July 16, 1998
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