Abstract
Excited states in the deformed nucleus 168Er have been studied with high energy resolution in the (p, t) reaction, with the Munich Q3D spectrograph. A large number of excited 0+ states (25) and 2+ states (64) have been assigned up to 4.0-MeV excitation energy. This allows detailed investigations along two directions of current interest: first, an extension of microscopic model interpretations into the region of medium level density above the pairing gap; second, a first analysis of the statistical fluctuation (order/chaos) properties of pure sequences of levels, in one deformed nucleus. Predictions of two models (the quasiparticle-phonon model and the projected shell model) are compared to the data, and it is concluded that, in both cases, mixing of more configurations is required in the wave functions.
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Bucurescu, D., Casten, R.F., Graw, G. et al. High-resolution study of 0+ and 2+ excitations in 168Er with the (p, t) reaction. Phys. Atom. Nuclei 70, 1336–1343 (2007). https://doi.org/10.1134/S1063778807080030
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DOI: https://doi.org/10.1134/S1063778807080030