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Exploring the spectroscopy of vibrational levels in the transitional rare earth region

Exploring the spectroscopy of vibrational levels in the transitional rare earth region. University of Cape Town / iThemba LABS Siyabonga Majola. Energy Postgraduate Conference 2013. Background and motivation - Bohr Approach.

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Exploring the spectroscopy of vibrational levels in the transitional rare earth region

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

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

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

  4. Configuration Dependence

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

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

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

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

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

  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

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