1. Transitional 150Sm88 : Octupole Deformed or Not ?
Two Experiments:
1. 148Nd(α,2n)150Sm Eα = 25 MeV
at Jyväskylä, Finland June 2009
2. 136Xe(18O,4n)150Sm E18O = 75 MeV
at iThemba LABS, SA June 2009

2. J F Sharpey-Schafer, S P Bvumbi, P Papka, T E Madiba, PJones, R A Bark, L Bianco, D Curien, D Cullen, P E Garrett, P T Greenlees, R Julin, S Juutinen, E Khalee, A Korichi, E A Lawrie, J J Lawrie, S N T Majola, L P Masiteng, A Minkova, S M Mullins, P Nieminen, L L Riedinger, O Shirinda, J Simpson, J Timár
University of Western Cape, South Africa.
University of Zululand, South Africa.
iThemba Laboratory for Accelerator Based Sciences, South Africa
University of Stellenbosch, South Africa.
JYFL, Jyväskylä, Finland.
University of Guelph, Canada
DRS-IPHC, Strasbourg, France
CSNSM, Orsay, France
INRNE, Bulgarian Academy of Sciences, Sofia, Bulgaria
University of Tennessee, Tennessee, USA
STFC Daresbury Laboratory, Warrington, UK
ATOMKI, Debrecen, Hungary

3. 152Gd88 Octupole Deformed ?? │02+> K=2- │01+>
R R Chasman, PRL 42 (1979) 630
│02+>
K=2-
│01+>
152Gd88

4. Previous 150Sm Urban et al., Acta. Phys. Pol. B32 (2001) 2527
Phys. Lett. 185 (1987) 331
20+
18+
136Xe(18O,4n)150Sm
150Nd(α,4n)150Sm

5. 1. 148Nd(α,2n)150Sm Eα = 25 MeV
at Jyväskylä, Finland June 2009
JUROGAM: 24 “Clover” detectors in BGO shields near 90º to the beam direction → Pγ
+ 15 “large” HPGe in BGO shields.
~4 mg cm -2 thick 148Nd target (94% enriched)
2½ days gave 1.5 Tbyt data

6. JUROGAM at Jyväskylä

7. Air Conditioned
Locked Digital Electronics

8. Susan Amel Siyabonga

9. from 148Nd(α,2n)150Sm reaction

10. 2. 136Xe(18O,4n)150Sm E18O = 75 MeV
at iThemba LABS, June 2009
AFRODITE: 8 “Clover” detectors in BGO shields
4 at 90º to the beam direction
4 at 135º to the beam direction
~3 mg cm -2 thick 136Xe target (99.8% enriched)
Cryogenically frozen on to a liquid nitrogen cooled backing ( 1mm Cu covered with 20 mg cm -2 Bi)
Xe freezes at 161K; Liquid Nitrogen boils at 63K.
4 days gave ~ γγ coincidences

14. from
136Xe(18O,4n)150Sm
reaction

15. 156Dy from the K=2 γ-band ground state band aligned i13/2 band 2nd
Gammasphere Data Nov. 2008
K=2
γ-band
ground
state
band
aligned i13/2 band
2nd
vacuum
156Dy from the
148Nd(12C,4n)156Dy
reaction
Spin I ( ħ )

16. 156Dy from the K=2 γ-band built on the aligned i13/2 band ground state
148Nd(12C,4n)156Dy
reaction
Spin I ( ħ )

17. Progress Report: 1. (α,2n) data from JUROGAM looks very good;
need to do γγγ analysis.
Should get DSAM lifetimes of high spin states from the (18O,4n) data.
The decay scheme is unusually complex; it will need hard work to find the second vacuum and γ-vibrational states.
No conclusion yet on Octupole deformation vs. Octupole vibrations !!