2{sub 1}{sup +} and 2{sub 2}{sup +} states in collective nuclei as multiple Q-phonon excitations
- Institut fuer Kernphysik, Universitaet zu Koeln, D-50937 Koeln (Germany)
- Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113 (Japan)
- Bogoliubov Theoretical Laboratory, Joint Institute for Nuclear Research, 141980 Dubna (Russia)
In the framework of the Q-phonon scheme and the interacting boson model a description of the 2{sub 1}{sup +} and 2{sub 2}{sup +} states is obtained. The wave vectors are written as an expansion in multiple Q-phonon excitations of the ground state. It is shown that the convergence of this expansion is fast and the main component already provides a good approximation of the wave vector. The accuracy of such a leading-order description exceeds 90{percent} of the wave vector. By taking into account two Q-phonon configurations the accuracy of the description of the 2{sub 1}{sup +} and 2{sub 2}{sup +} states is increased to 98{percent}. This is true for all collective nuclei with the exception of some rotors where the first excited K=0 band lies below or very close to the {gamma} band and, due to band mixing, the wave vector of the 2{sub 2}{sup +} state contains higher Q-phonon excitations. An application to some decay transitions is given. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 565978
- Journal Information:
- Physical Review, C, Vol. 57, Issue 1; Other Information: PBD: Jan 1998
- Country of Publication:
- United States
- Language:
- English
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