ISOLDE faciliteten Karsten Riisager PH Department CERN

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1 ISOLDE faciliteten Karsten Riisager PH Department CERN http://www.cern.ch/isolde http://www.phys.au.dk/subatom

2 CERNs acceleratore

3 ISOLDE@CERN

4 RIB - Produktions reaktioner Spallation Fragmentation Fission –n- (termisk eller energetisk), p- induceret –fotofission (e-beam) 1 GeV p p n 2 3 8 U 2 0 1 F r + spallation 1 1 L i X + + fragmentation 1 4 3 C s Y + + fission

5 Target – Ion-kilde matrix Container:20 x 2 cm cylinder of Ta Material: LiquidLa, Pb, Sn Metal foil/powderNb, Ti, Ta.. OxidesCaO, MgO CarbidesSiC, UC, ThC Ion-source Surface Plasma Laser FluorinationCF4 or SF6

6 Converter Target Standard Targets Converter Target p+

7 Overflade & plasma ionisering

8 Laser ionisering

9 ISOLDEs periodiske system

10 ISOLDE udbytter, 2006 ISOLDE target group M. Turrion

11 Forskning med langsomme radioaktive ioner Nuclear Physics Nuclear Decay Spectroscopy and Reactions Structure of Nuclei Exotic Decay Modes Atomic Physics Laser Spectroscopy and Direct Mass Measurements Radii, Moments, Nuclear Binding Energies Nuclear Astrophysics Dedicated Nuclear Decay/Reaction Studies Element Synthesis, Solar Processes f(N,Z) Fundamental Physics Direct Mass Measurements, Dedicated Decay Studies - WI CKM unitarity tests, search for  - correlations, right-handed currents Applied Physics Implanted Radioactive Probes, Tailored Isotopes for Diagnosis and Therapy Condensed matter physics and Life sciences

12 Kerne-egenskaber fra laser spektroskopi Isotop skift af atomar overgang 176 Hf 178 Hf Analyse giver ændringen i kernens “mean square charge radius” Kernens størrelse, statiske og dynamiske deformationer Hyperfin struktur af atomar overgang 177 Hf Kerne spin I Magnetisk moment µ Quadrupol moment Q s ppm shift (Isotop skift fra centroider af hyperfin multiplet) J. Billowes

13 Experimental Setup at COLLAPS electrostatic deflection Photo multiplier + + + o ion beam E kin ~60 keV laser beam fixed frequency electrostatic lenses for retardation charge exchange cell (Na) excitation & observation region Beamline:

14 Kluge & Nörtershäuser 2003 Status af laser målinger af momenter og radier

15 B = 4.7 T B = 5.9 T 2 m G. Bollen, et al., NIM A 368, 675 (1996) F. Herfurth, et al., NIM A 469, 264 (2001) determination of cyclotron frequency (R = 10 7 ) removal of contaminant ions (R = 10 5 ) Bunching of the continuous beam ISOLTRAP: Experimentel opstilling B + q/m A. Herlert

16 Begrænsninger for kerne modeller

17 Isomer selektion og spin bestemmelse, 68,70 Cu neutron number proton number J. Van Roosbroeck et al., Phys. Rev. Lett. 92, 112501 (2004) K. Blaum et al., Europhys. Lett. 67, 586 (2004)

18 REXEBIS Experiments REXTRAP MASS SEPARATOR 7-GAP RESONATORS @ 101.28 MHz IH RFQ 9-GAP RESONATOR @ 202.56 MHz 3.0 MeV/u 2.2 MeV/u 1.2 MeV/u 0.3 MeV/u ISOLDE beam 60 keV Rebuncher Primary target High energy driver beam protons Optional stripper ISOLDE REX-Isolde * 6 kaviteter * 100 og 200 MHz, ~100 kW * 300 keV/u til 3 MeV/u * longitudinal akkumulering og bunching * transvers faserums køling * ladnings “boost” * 1+ ioner til n+ D. Voulot

19 AXAX Energy Spin and Parity Decay Strength Distributions E.M.- Transition Matrix Elements Spectroscopic Factors Shape and Moments Coulomb excitation Fusion Evaporation, Fragmentation, Fission AYAY T 1/2 Radioactive Decay A-1 X (d,p) Few nucleon transfer Deep inelastic scattering P. Van Duppen

20 “Sikker” Coulomb Excitations experimenter  partikel (CD) -  korrelationer München, Köln, Heidelberg, Leuven, Daresbury, Strasbourg,... E/A = 2.8 MeV/u

21 LASER OFF LASER ON counts/4keV E [keV] 2006 J. Van De Walle 80 Zn 50

22 N=50 og Z=28 Ni Zn Ge Se Kr Sr 28 50 40 sd-shell 1f 7/2 2p 1/2 1f 5/2 2p 3/2 sd-shell 28 50 1g 9/2 40 

23 28 50 40 sd-shell 1f 7/2 2p 1/2 1f 5/2 2p 3/2 sd-shell 28 50 1g 9/2 40  -2 lukkede skaller -Neutronrige kerner -Lige-lige Isotoper Neutron Number B(E2,0 + 1  2 + 1 ) [e 2 b 2 ] E(2 + 1 ) [MeV] 285082126 78 Ni

24 Proton Number Neutron Number Ni Zn Ge N=50 isotoner B(E2,2 + 1  0 + 1 ) [W.u.] E(2 + 1 ) [keV] B(E2,2 + 1  0 + 1 ) [W.u.] E(2 + 1 ) [keV] Ni,Zn,Ge isotoper J. Van De Walle

25 6 He 806 ms 8 He 119 ms 7 He 806 ms 9 He 806 ms 9 Li 179 ms 10 Li 806 ms 11 Li 8.5 ms 11 Be 13.8 s 12 Be 23.6 ms 14 Be 4.35 ms 13 Be 806 ms V nn V Cn Unbound Bound N=8 Halo tilstande i kerner B. Jonson

26 9 Li+ 2 H→t+ 8 Li * » 9 Li d » 8 Li t Detector Eksempel på neutron overførsel fra 9 Li til en deuteron – danner en triton 9 Li+ 2 H→ 8 Li+t 9 Li+ 2 H → ? 9 Li+ 2 H→ 8 Li+t H.B.Jeppesen et al. Phys. Lett. B635 (2006) 17 H.B.Jeppesen et al. Nucl. phys. A748 (2005) 374 H.B. Jeppesen

27 10 Li, sammenligning med teori Konklusion: Behøver s- og p-bølge komponenter for at beskrive energi spektret H.B.Jeppesen et al., Phys. Lett. B642 (2006) 449 CCBA beregninger Af A.M. Moro Varierer kun potential-dybden (2 frie parametre)

28 PAC in a nutshell Calculate spectroscopic data based on structure Compare W180 W90 Hemmingsen et al. Chem. Rev., 2004, 104:4027

29 Pb/Hg binding site Formål: dan og karakteriser tungmetalioners “binding sites” svarende til de naturligt forekommende – forstå den molekylære baggrund for tungmetallers toxicitet LC L16C LLCL G-LKALEEK-LKALEEK-CKALEEK-LKALEEK-G