Systematics of low-lying dipole excitations in the deformed even-even nuclei {sup 164,166,168,170}Er
- Institut fuer Strahlenphysik, Universitaet Stuttgart, Allmandring 3, D-70569 Stuttgart (Germany)
Photon scattering experiments on the deformed even-even nuclei {sup 164,166,168,170}Er provided detailed information on the excitation energies, spins, transition probabilities, and {ital K} quantum numbers of low-lying dipole excitations. In the case of {sup 168}Er, in addition, parities of the excited states were determined model independently by measuring the linear polarization of the scattered photons using a sectored Ge-Compton polarimeter with a BGO{endash}anti-Compton shield. The results for {ital M}1 excitations are compared with the systematics of low-lying orbital {ital M}1 strength ({open_quote}{open_quote}scissors mode{close_quote}{close_quote}) in the neighboring rare-earth nuclei. The observed enhanced {ital E}1 transitions are discussed in terms of collective excitations ({ital K}=0 octupole bandheads or candidates for 2{sup +}{circle_times}3{sup {minus}} two-phonon excitations) and in the framework of recent microscopic quasiparticle phonon model calculations. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 284760
- Journal Information:
- Physical Review, C, Vol. 53, Issue 6; Other Information: PBD: Jun 1996
- Country of Publication:
- United States
- Language:
- English
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