Abstract
The transitional nucleus 154 Gd was investigated using a combination of a photon scattering experi- ment and a γγ-coincidence study following the β decay of 154 Tb. A novel decay channel from the scissors mode to the band head of the β-band was observed. Its transition strength B(M1; 1 + sc → 0 +) was determined. An IBM-2 calculation reveals a correlation of this decay channel and the shape phase transition between spherical and deformed nuclei.
Highlights
Quantum phase transitions in mesoscopic systems are of great interest in contemporary physics and are found in atomic nuclei, molecules, atomic clusters and finite polymers
An interacting boson model (IBM)-2 calculation reveals a correlation of this decay channel and the shape phase transition between spherical and deformed nuclei
It is desired to study those properties of the scissors mode that arise entirely from finite number effects of valence particles, such as electromagnetic transition rates to other intrinsic excitations
Summary
Quantum phase transitions in mesoscopic systems (finite number N of particles) are of great interest in contemporary physics and are found in atomic nuclei, molecules, atomic clusters and finite polymers. In deformed nuclei a decay of the scissors mode to the β-band would annihilate the scissors-like oscillation while simultaneously exciting a βvibration. A γ-decay of the scissors mode to other intrinsic excitations has so far not been reported In this proceeding we report the first observation of a γ-ray transition between the scissors mode and the β-band head. The 1+sc scissors mode state at 2934 keV in 154Gd has the strongest M1-transition in the Gd isotopes (compare figure 1)
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