E2 decay strength of the M1 scissors mode of 156Gd and its first excited rotational state

T. Beck*, J. Beller, N. Pietralla, M. Bhike, Johnny Birkhan, V. Derya, U. Gayer, A. Hennig, J. Isaak, B. Loeher, V. Yu. Ponomarev, A Richter, C. Romig, D. Savran, Marcus Scheck, W. Tornow, V. Werner, A. Zilges, M. Zweidinger

*Corresponding author for this work

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Abstract

The E2/M1 multipole mixing ratio δ1→2 of the 1+sc→2+γ-ray decay in 156Gd and hence the isovector E2 transition rate of the scissors mode of a well-deformed rotational nucleus has been measured for the first time. It has been obtained from the angular distribution of an artificial quasimonochromatic linearly polarized γ-ray beam of energy 3.07(6) MeV scattered inelastically off an isotopically highly enriched 156Gd target. The data yield first direct support for the deformation dependence of effective proton and neutron quadrupole boson charges in the framework of algebraic nuclear models. First evidence for a low-lying Jπ=2+ member of the rotational band of states on top of the 1+ band head is obtained, too, indicating a significant signature splitting in the K=1 scissors mode rotational band.
Original languageEnglish
Article number212502
JournalPhysical Review Letters
Volume118
DOIs
Publication statusPublished - 26 May 2017

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