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

Future Triaxial Studies Does the i 13/2 sequence in 167 Ta show evolution from  = 0 o to 20 o ? Does the i 13/2 sequence in 167 Ta show evolution from  = 0 o to 20 o ? –High-statistics lifetime experiment 161 Lu 175 Hf 174 Hf 173 Hf 170 Hf 171 Hf 162 Lu 168 Hf 172 Hf 163 Lu 164 Lu 165 Lu 168 Lu 167 Lu Ta 167 Ta 161 Tm 165 Ta SD seen, but no wobbling Wobbling observed 163 Tm 169 Ta

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

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

Plans with CARIBU

Predicted Stable Triaxiality at High Spin in N-Rich Mo and Ru Nuclei Skalski et al. find stable γ minimum Skalski et al. find stable γ minimum Also see superdef Also see superdef J. Hamilton et al. & C.Y. Wu et al. pushed up around I=20 J. Hamilton et al. & C.Y. Wu et al. pushed up around I=20 Safe Coulex to measure Q 0 Safe Coulex to measure Q 0 Unsafe Coulex to go beyond I=20 Unsafe Coulex to go beyond I=20 J. Skalski et al., NPA 617, 282 (1997)

Equipment, computer needs… Need Gammasphere Need Gammasphere Chico or Super-Chico Chico or Super-Chico

Hercules Projects…

n w =1 n w =2 Triaxial nucleus allows rotation about all 3 axes Collective angular momentum vector lies off principal axis –P–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 –M–Moments of inertia, quadrupole moment, alignment D.R. Jensen et al., PRL 89, (02) Direct Evidence of Triaxiality? 163 Lu n w =0

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