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

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)

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

ISOLDE (2008)

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

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)

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

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

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

“Island of inversion”

An example: 30-33Mg Magnetic moments 31,33Mg, COLLAPS Yordanov et al, PRL 99 (2007) 212501 Kowalska et al PRC77 (2008) 034307 μ = -0.7456 (5)μN Spin 3/2 2p2h g.s. (intruder) NMR 33Mg, MgO IS427

An example: 30-33Mg Coulex of 30,32Mg and 31Mg – Reiter et al Niedermaier et al, PRL 94 (2005) 172501 32Mg 107Ag IS410

An example: 30-33Mg 2nd 0+ in 30Mg at 1788 keV, weak mixing – Schwerdtfeger, Thirolf et al, arXiv:0808.0264 More results: H. Mach et al. IS414

An example: 30-33Mg 2nd 0+ in 30Mg at 1788 keV, weak mixing – Schwerdtfeger, Thirolf et al, arXiv:0808.0264 Coulex of (30,32Mg and) 31Mg – Reiter et al (Niedermaier et al, PRL 94 (2005) 172501) Transfer d(30Mg,31Mg)p, (t,p)… – Bildstein et al Magnetic moments 31,33Mg, COLLAPS – Yordanov et al, PRL 99 (2007) 212501; Kowalska et al PRC77 (2008) 034307 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,...

ISOLTRAP: 80-81Zn N=50 still robust shell at Z=30 IS413 S. Baruah et al, PRL 101 (2008) 262501 N=50 still robust shell at Z=30 Neutron separation energy (MeV) versus N IS413

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

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

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

Probing unbound 10Li 2.77 MeV/u IS367

11Li 287 MeV/u FRS-ALADIN-LAND@GSI 10Li

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) 062503

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+

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

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

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