1. Electromagnetic moments for isomeric states in nuclei far from stability in nuclei far from stability NIPNE Bucharest ↔ INFN LNL Legnaro 10 experiments @XTU - Tandem Legnaro Detailed studies of isomeric states [ns - µs] → lifetimes and decay schemes → g-factors → spectroscopic quadrupole moments

2. NIPNE – Bucharest new isomers, g, Q s nuclei near stability NIPNE – Bucharest new isomers, g, Q s nuclei near stability INFN XTU – Tandem accelerator INFN LNL XTU – Tandem accelerator Heavy ions pulsed beams  T=2 ns T rep = 200 ns ÷ 6.4 µs GAMIPE beam line g factors H ext    L = g  N H ext /h Cubic crystalline lattice EFG Q s Electric Field Gradients Noncubic crystalline lattice EFG  Q = Q s V zz / 4I(2I-1)h V zz EFG (Probe Host) calibrated Nuclear moment measurements Dedicated experiments - Hyperfine interactions TDPAD Time Differential Perturbed Angular Distribution Method

3. A~130 shape evolution A~130 shape evolution 136 Pr 6 + T 1/2 g Nucl. Phys. A 603, 50 (1996) 129,131 Ce 9/2 - g Q s Nucl. Phys. A 633, 459 (1998) 130 Ce 7 - Q s Phys. Rev. C 60, 024316 (1999) A~180 K isomers A~180 K isomers 175 W 7/2 - g Phys. Lett. B 495, 289 (2000) 176 W 14 + T 1/2 g Q s Phys. Lett. B 541, 219 (2002) Shape coexistence Pb Shape coexistence Pb 29/2 - 191 Pb 29/2 - 33/2 + T 1/2 AIP Conf. Proc. 831, 278 (2006) 29/2 - 193 Pb 29/2 - 21/2 - 33/2 + T 1/2 g Q s Eur. Phys. J. A 20, 191 (2004) Phys. Rev. C 70, 034305 (2004) 192,194 Pb 8 + 11 - 12 + T 1/2 Q s Acta Phys.Pol.B38,1249 (2007) Phys. Lett. B 2007 in press 188 Pb 11 - 12 + g LNL Ann. Rep. 2006, p. 33

4. LNL 164 Dy( 16 O,4n) 176 W LNL 164 Dy( 16 O,4n) 176 W 83 MeV  T=2 ns T rep =800 ns 176 W 14 + isomer T 1/2 = 35(10) ns B. Crowell et al., PRL 72, 1164 (1994) High K states E transitions ν = ΔK – λ degree of K-forbiddenness f ν = (T 1/2 γ /T 1/2 W ) 1/ ν usually f ν ~100 f ν → 2.3 (917 keV) 3.6 (945 keV)

5. g factor M. Ionescu-Bujor et al., Phys. Lett. B 495, 289 (2000) Q s M. Ionescu-Bujor et al., Phys. Lett. B 541, 219 (2002) g R (14 + ) = 0.269(34) MI Pb host H ext = 27.5 kG QI Tl host g exp (14 +, 176 W) = +0.462 (11) g calc (14 + ) = +0.475 (15) | Q s | (14 +, 176 W) = 6.0 (7) eb Q o = 7.4 (9) eb 14 +  7/2 + [404] 9/2 - [514] 5/2 - [512] 7/2 + [633]  2 (14 + ) = 0.29(4)

6. Shape coexistence in Pb isotopes 188 Pb 190 Pb 192 Pb 194 Pb D. Karlgren et al., PRC 73, 064304 (2006) Potential energy surfaces Z=82 0p-0h Isomers ns - µs  12+ 12+ (1i 13/2 2 ) 11 – 11 –  (3s 1/2 -2 1i 13/2 1h 9/2 ) 8 – 8 – (1i 13/2 1h 9/2 -1 ) 2p-2h 4p-4h Static moments  Q s M. Ionescu-Bujor et al., Phys. Lett. B (2007) in press

7. 168 Er ( 28 Si, 4n) 192 Pb 143 MeV pulsed  T = 2 ns T rep = 3.2  s

8. – 11 –  (3s 1/2 -2 1i 13/2 1h 9/2 )  9 – (2f 5/2 1i 13/2 ) 8 +  (3s 1/2 -2 1h 9/2 2 )  6 + admixture intruder – 9 – (2f 5/2 1i 13/2 )  7 – (3s 1/2 1i 13/2 )

9. 192,194 Pb TDPAD QI Bi crystalline lattice |Q s | → 0.32 (4) eb 0.48 (3) eb V zz (PbBi)= 1.39(10) 10 21 V/m 2 |Q s | → 2.9 (3) eb 3.6(4) eb

10. 11 – 12 + M. Ionescu-Bujor et al., Phys. Lett. B (2007), doi: 10.1016/j.physlettb.2007.05.002 Q o (11 –, 192 Pb)  shape mixing 11 – 12 + (1i 13/2 -2 )  2  + 0.02 11 –  (1i 13/2 1h 9/2 )  2  –0.12 PQ PQ Pairing + quadrupole model PQ TAC PQ TAC Magnetic rotation S. Frauendorf, NPA 677, 115 (2000) HFB N.Smirnova et al., PLB 569, 151 (2003) IBM V. Hellemans, PRC 71, 034308 (2005)

11. 188 Pb triple shape coexistence 12 + spherical (1i 13/2 ) 2 11 – oblate  (1i 13/2 1h 9/2 ) 8 – prolate ( 1i 13/2 1h 9/2 -1 ) LNL XTU Tandem  TDPAD experiments in progress LNL XTU Tandem  TDPAD experiments in progress g factors 12 + 11 - M. Ionescu-Bujor et al., LNL Ann. Rep. 2006, INFN-LNL-217(2007), p. 33 G.D.Dracoulis et al., PRC 67, 051301(R) (2003

12. NIPNE Bucharest: NIPNE Bucharest: M. Ionescu-Bujor, A. Iordachescu, D. Bucurescu, N. Marginean, C.A. Ur, G. Suliman, C. Rusu Collaborations: Collaborations: INFN Padova, INFN Legnaro, Bonn, Leuven, Sao Paolo, Sofia, Surrey