A novel decay channel of the 1+ scissors mode: coupling to the vibrational β-excitation
1 Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, D-64289 Darmstadt, Germany
2 Institut für Kernphysik, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany
3 Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, Connecticut 06520-8120, USA
4 ExtreMe Matter Institute and Research Division, GSI, Planckstr. 1, D-64291 Darmstadt, Germany
5 Frankfurt Institute for Advanced Studies, D-60438 Frankfurt am Main, Germany
6 Wright Nuclear Structure Laboratory, Yale University, New Haven, CT 06520-8120, USA
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The transitional nucleus 154Gd was investigated using a combination of a photon scattering experiment and a γγ-coincidence study following the β decay of 154Tb. A novel decay channel from the scissors mode to the band head of the β-band was observed. Its transition strength B(M1; 1sc+ → 0β+) was determined. An IBM-2 calculation reveals a correlation of this decay channel and the shape phase transition between spherical and deformed nuclei.
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