1. The science programme at ISOLDE
Karsten Riisager
Dept. of Physics and Astronomy
University of Aarhus

2. Facility for isotope production
Energy range 10-6 eV (10 mK) to 3 MeV/u
Intensity 1 – 1010 ions/s
Isotope range 6He to 232Ra
(Z: 2-88, N:4-144)

3. Motivation (a reminder…)
Nuclear physics (incl. applications) thrives on variety
Intrinsic many-particle structure (2 fermions !)
multitude of quantum states, a rich variety of phenomena
finite # particles, structure still varies rapidly
Progress needed on many fronts
need different experimental techniques
need many isotopes

4. ISOLDE (2008)

5. ISOLDE: a unique facility
Ideal driver beam for ISOL
Variety of beams: leading laboratory for developments in
target/ion-sources
ion beam manipulation
experimental set-ups
Strong users community

6. Research with slow Radioactive Ion Beams
Applied Physics
Implanted Radioactive Probes, Tailored Isotopes for Diagnosis and Therapy
Condensed matter physics and Life sciences
Research with slow Radioactive Ion Beams
Nuclear Physics
Nuclear Decay Spectroscopy and Reactions
Structure of Nuclei
Exotic Decay Modes
Fundamental Physics
Direct Mass Measurements, Dedicated Decay Studies - WI
CKM unitarity tests, search for
b-n correlations, right-handed currents
Atomic Methods
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)

7. Examples of research themes
Nuclear Physics (abstract ID number)
shell closures  shape evolution (6,31,74)  shape coexistence (18,33,62)  halo nuclei (96)…
Fundamental interactions
P, T violation (45)  neutrinos (59,66)  Vud (69)
Solid state physics
semiconductors  spintronics (64)  nano… (88)
Biophysics, medical physics
radioisotopes (44)  heavy metal toxicity

8. De novo designed heavy metal
ion binding proteins
De novo design of proteins/peptides means that the amino acid sequence is put together synthetically, and thus that we can control it and see how changes affect the metal ion binding sites – as such it is a tool to explore how both the immediate surrounding of the metal ion binding site as well as the proteins structure further away from the metal ion binding site may be used to tune the metallo-protein to ahve a specific function. The design in this case is such that the proteins coil up to a helix, and on each helix a metal ion binding amino acid (a cysteine, the sulphur binding to Hg(II) is shown in yellow in the figure to the right) is introduced. On the figure to the left (lower part) each red circle illustrates a helix. The 199mHg PAC data above illustrate that at low pH (6.5) the local structure is a linear distorted S-Hg-S, possibly with a third helix present but not with the sulphur binding to Hg(II), and thus present as –SH. At higher pH this third thiol is deprotonated and thus binds to Hg(II).
The structure is therefore controlled by pH & the presence of the metal ion. The general aim of this project is to study the basic chemistry of metal ions in biological systems. The local structure (HgS3) is highly similar to the bacterial mercury biosensor (MerR).
IS448
Iranzo et al. Chem. Eur. J., 2007, 13:9178

9. Determination of lattice positions
ECSLI Mn beam time: b- emission channeling patterns from 61Co in GaN
61Mn implanted (~1013 cm-2)
wait 25 min + anneal at 800°C
emission channeling patterns measured from 61Co b- particles
fit results: 61Co on substitutional Ga sites
IS453

10. “Island of inversion”

11. An example: 30-33Mg Magnetic moments 31,33Mg, COLLAPS
Yordanov et al, PRL 99 (2007)
Kowalska et al PRC77 (2008)
μ = (5)μN
Spin 3/2
2p2h g.s.
(intruder)
NMR 33Mg, MgO
IS427

12. An example: 30-33Mg
Coulex of 30,32Mg and 31Mg – Reiter et al Niedermaier et al, PRL 94 (2005)
32Mg
107Ag
IS410

13. An example: 30-33Mg
2nd 0+ in 30Mg at 1788 keV, weak mixing – Schwerdtfeger, Thirolf et al, arXiv:
More results: H. Mach et al.
IS414

14. An example: 30-33Mg
2nd 0+ in 30Mg at 1788 keV, weak mixing – Schwerdtfeger, Thirolf et al, arXiv:
Coulex of (30,32Mg and) 31Mg – Reiter et al (Niedermaier et al, PRL 94 (2005) )
Transfer d(30Mg,31Mg)p, (t,p)… – Bildstein et al
Magnetic moments 31,33Mg, COLLAPS – Yordanov et al, PRL 99 (2007) ; Kowalska et al PRC77 (2008)
Masses, MISTRAL – Lunney et al, Eur. Phys. J. A28 (2006) 129
Level lifetimes – Mach et al, Eur. Phys. J. A25 (2005) 105
Radii, beta-decay studies,...

15. ISOLTRAP: 80-81Zn N=50 still robust shell at Z=30 IS413
S. Baruah et al, PRL 101 (2008)
N=50 still robust shell
at Z=30
Neutron separation energy (MeV) versus N
IS413

16. REX – Coulex: agree J. Van De Walle et al, PRL 99 (2007) 142501
Ni,Zn,Ge isotopes
N=50 isotones
E(2+1) [keV]
E(2+1) [keV] Ge
B(E2,2+10+1) [W.u.]
B(E2,2+10+1) [W.u.] Zn Ni
IS412
Neutron Number
Proton Number

17. Halo nuclei 11Li 11Be 1996 1966 1983 9Li+d 8Li+t 1980 1979 8Be+3n
20.551
0.320
0.501
7.313
8.979
17.913
15.718
(MeV)
3/2-
10.59
8.82
Open delayed-particle channels in the 11Li beta decay
1966
1974
1979
1980
1983
1996
9Li+d
7.914
6He+4He+n
IS417

18. Multi charged-particle branch
11Li
M. Madurga et al,
submitted to PLB
Kinematic identification of
(beta-delayed) decay branches:
4He + 7He
3H + 8Li
etc
Selecting one
channel reveals
new level at
16.3 MeV
IS417

19. Probing unbound 10Li
2.77 MeV/u
IS367

20. 11Li
287 MeV/u
10Li

21. Charge radius of Be isotopes
Servo
Dye Laser
(Anticollinear)
Be+ Beam
Shaping Optics
Photomultiplier
Rb Clock
Frequency
Comb
Retardation
Signal I2
Deflector
(Collinear)
Doubler
beam
blocker
Preliminary
Laser
SpHERe
Laser Spectroscopy of Highly Charged
Ions and Exotic Radioactive Nuclei
(VH-NG-148 Helmholtz Young Investigators Group)
IS449
W. Noertershaeuser, PRL 102 (2009)

22. The beta-decay of 12B 12B 1+ 12C 15.11 1+ 12.71 1+ Not observed 10.3
0.0008
10.3
0,2+
Hans Fynbo,
Christian Diget et al.,
Nature 433 (2005) 136
0.015 3a
threshold
7.6542 0+
7.275
0.013
EXPECT TO SEE
4.4389 2+
0.9722 
12C 0+

23. 12C ISOLDE Jyväskylä Beta-decay to levels in 12C
select decays through 8Be(0+)
R-matrix analysis
IS404

24. The triple-alpha reaction rate
INTERFERENCE HAS LITTLE INFLUENCE
MISSING 2+ STATE REDUCE RATE AT HIGH T9
POSSIBLE INFLUENCE OF HIGHER RESONANCES
CF BUCHMANN AND BARNES
(MORE TO SAY LATER)
PAUSE AFTER THIS
C. Diget, H. Fynbo
IS404

25. The ISOLDE Physics Group The ISOLDE Technical Group
Thanks to:
The ISOLDE Physics Group
The ISOLDE Technical Group
The ISOLDE Collaboration
Hans Fynbo
Lars Hemmingsen
Alexander Herlert
Mark Huyse
Björn Jonson
Magdalena Kowalska
Miguel Madurga
Peter Reiter
Piet Van Duppen
Existing program needs
upgrades of:
Beam “quality”
Intensity
Energy