1. Exploring the spectroscopy of vibrational levels in the transitional rare earth region University of Cape Town / iThemba LABS Siyabonga Majola Energy Postgraduate Conference 2013

2. V(β) β V( γ ) γ Background and motivation - Bohr Approach Early success of the Bohr in the Rare earth Region First excited 0 + state First excited 2 + state

3. Further confusion caused by pairing in the N=90, A ≈ 160 - quadrupole pairing Give rise to 0 + ground states in even-even V(β) Ground Second Coexistence Pure Mixing Background and motivation - Confusion due to shape coexistence and pairing β β Monopole term Quadrupole term

4. Configuration Dependence

5. Experimental Details 155 Gd (α,2n) 157 Dy ; 25 MeV ~(2-3 days) Siya Majola Department of Physics University of Jyväskylä, Finland

6. Previous in-beam works Hayakawa et al Scheme divided into three [521]3/2 - [651]3/2 - [505]11/2 - K<= 5/2 K>= 11/2

7. Experimental Results [521] and [651] connected via ground_1 [521]3/2 - [651]3/2 + New Bands

8. Experimental Results [651]3/2 + New Bands New

9. Experimental Results [505]11/2 - New Bands New

10. Discussion and Conclusion Total of 9 new bands First gamma band in the odd-even on Dy isotope has been observed The Tracking of [505]11/2 by its own γ-band demonstrates the nature of γ-bands Include all detectors in sort –DCOs and Polarization