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Future Triaxial Studies

This presentation delves into the search for wobbling in neutron-rich nuclei, focusing on new experimental findings in isotopes such as 169Ta and Hf. It examines the influence of the proton Fermi surface on wobbling, analyzes the evolution of the i13/2 sequence in 167Ta, and discusses the observed superdeformed bands in even-even and odd-A nuclei. The need for advanced equipment such as Gammasphere and digital DAQ systems for high-statistics experiments is highlighted. Future directions include predicting stable triaxial configurations in neutron-rich Mo and Ru nuclei.

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Future Triaxial Studies

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  1. 169Ta 175Hf 174Hf 173Hf 170Hf 171Hf 168Hf 172Hf 167Lu 165Lu 161Lu 163Lu 164Lu 168Lu 162Lu 171Ta 165Ta Future Triaxial Studies • What role does the proton Fermi Surface have in the observation of wobbling? • Search for wobbling in 169Re (approved) 169Re 167Ta 90 92 94 96 98 100 102 SD seen, but no wobbling 161Tm 163Tm Wobbling observed

  2. 169Ta 175Hf 174Hf 173Hf 170Hf 171Hf 172Hf 168Hf 165Lu 163Lu 167Lu 161Lu 164Lu 168Lu 162Lu 171Ta 165Ta Future Triaxial Studies • Does the i13/2 sequence in 167Ta show evolution from  = 0o to 20o? • High-statistics lifetime experiment 167Ta 90 92 94 96 98 100 102 SD seen, but no wobbling 161Tm 163Tm Wobbling observed

  3. 175Hf 174Hf 173Hf 170Hf 171Hf 168Hf 172Hf 169Ta 167Lu 165Lu 161Lu 163Lu 164Lu 162Lu 168Lu 165Ta 171Ta Future Triaxial Studies • Return to heavier Hf • Why do even-even show so many SD bands while odd-A typically only have one? • High-statistics run to observed linking transitions in 173,174Hf 167Ta 3 2 1 3 1 8 2 90 92 94 96 98 100 102 SD seen, but no wobbling 161Tm 163Tm Wobbling observed

  4. Equipment, computer needs… • Just need Gammasphere • Digital DAQ would require fewer days to perform high-statistics experiments

  5. Plans with CARIBU

  6. Predicted Stable Triaxiality at High Spin in N-Rich Mo and Ru Nuclei • Skalski et al. find stable γminimum • Also see superdef • J. Hamilton et al. & C.Y. Wu et al. pushed up around I=20 • Safe Coulex to measure Q0 • Unsafe Coulex to go beyond I=20 J. Skalski et al., NPA 617, 282 (1997)

  7. Equipment, computer needs… • Need Gammasphere • Chico or Super-Chico

  8. Hercules Projects…

  9. Direct Evidence of Triaxiality? nw=0 163Lu nw=1 • Triaxial nucleus allows rotation about all 3 axes • Collective angular momentum vector lies off principal axis • Precession + Wobbling • Amount it lies off axis quantized into wobbling phonons (nw) • See a family of bands based on same configuration (different nw) • Bands are linked together • I = 1 have dominant E2 nature • Bands have similar properties • Moments of inertia, quadrupole moment, alignment nw=2 D.R. Jensen et al., PRL 89, 142503 (02)

  10. The Continued Pursuit of Stable Triaxiality • Near Future: • Wobbling bands in tantalum nuclei • Not-too-distant Future • A ~ 110 neutron-rich nuclei through CARIBU STABLE TRIAXIALITY ME

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