Bericht zu

1. Bericht zu Thorsten Kröll KHuK-Jahrestreffen 5.-6.12.2013

2. … in a nutshell ISOLTRAP Extension hall COLLAPS MINIBALL T-REX CRIS 9-gap LIST ~ 2.85 MeV/u RIB production RILIS 1.4 GeV protons from PS-Booster

3. Production of radioactive molecular beams • Beam purification with molecular beams: • new developments: 9CO+, 8BFn+ • technique already used successfully, e.g.: • - 70SeCO+ PRL 98, 072501 (2007) • - 136Sn32S+ NPA 805, 218 (2008) • - 140,142BaF+PRC 86, 034310 (2012) Transport Isotope production Ionization Diffusion C. Seiffert (CERN/TU Darmstadt), T. Stora (CERN), ...

4. High selective ion beam production with Laser Ion Source & Trap (LIST) • 1. ISOLDE Target: • Production of exotic nuclei • 2. RILIS: • Element selective ionization • 3. LIST: • Full Isobar Suppression Extractor RILIS Laser Beams ISOLDE target LIST isobar suppression for Fr isotopes Selectivity above 1000 - but strongly depending on individual isotope Proof of LIST operation @ UCn target First studies of 217Po with LIST and KUL Windmill -Detector LIST NIM B 317, 417 (2013) Sven Richter, Daniel Fink, Klaus Blaum, Tobias Kron, Klaus Wendt and the RILIS/ISOLDE Collaboration

5. ) 1 - m 1 6 2 0 0 c ( ) r 1 - m e 0 . 5 c ( b s 1 6 0 0 0 l m 0 . 0 a u u d i n s - 0 . 5 e e r v 1 5 8 0 0 0 1 0 2 0 3 0 a w n ' 0 5 1 0 1 5 2 0 2 5 3 0 3 5 n ' In-source Spectroscopy on Astatine (RILIS - Resonant Ionisation Laser Ion Source) • First ever laser spectroscopy on astatine at ISOLDE/RILIS and TRIUMF/TRILIS • Verification of levels, yield measurements using various detector systems • Advanced atomic physics evaluation for the IP and nuclear structure via HFS and IS measurement EIP(At) = 75151(1) cm-1 S. Rothe et al., Nature Comm. 4:1835 (2013)

6. COLLAPS (Collinear Laser Spectroscopy) Simple Behavior in Complex Nuclei: Qs-Moments of Cd 11/2- Isomers 92 1h9/2 1h 82 Capacity of 1h11/2niveau: 12 neutrons → 6 quad. moments But: 10 quad. moments Neutron pairs shared between the neighboring levels. 82 1h11/2 3s 3s1/2 70 2d3/2 68 2d 2d5/2 64 1g7/2 58 1g 50 1g9/2 50 D.T. Yordanov et al, PRL 110 (2013) 192501 W. Nörtershäuser (TU Darmstadt)

7. Preparation for 2014: A Setup for State-Selective Charge Exchange to Measure Radii and Moments of 53,54Ca Moments andRadiiof51,52Ca measured in 2012, 53,54Ca targetedfor 2014 ParticleDetection  Higher Efficiency thanforfluorescencedetection.

8. Magic Number Probed with Ca F. Wienholtz et al., Nature 498, 346 (2013) • Multi-reflection time-of-flightmassspectrometry R. N. Wolf et al., NIM A 686, 82 (2012) R. N. Wolf et al., IJMS 349-350, 123 (2013) 52Cr 39K 52K 52Ca 350 rev. ≈ 0.5km δm/m ≈ 3•10-7 Ù • High E(2+) energy in 52Ca • Mass measurements via S2n establish magic number at N=32 • Correct prediction from 3-N forces 8 S. Kreim (MPI-K Heidelberg)

9. ISOLTRAP‘s other techniques S. Kreim et al., NIMB (2013) DOI:10.1016/j.nimb.2013.07.072 • Penning-trapmassspectrometry 82Zn excluded from crust!!! R. N. Wolf et al., PRL 110, 041101 (2013) S. Kreim et al., DOI:10.1016/j.ijms.2013.02.015 (2013) Depth profile of a neutron star with experimentally known and theoretical masses 80 ions in 35 minutes! δm/m = 4•10-8 • Future plans: Phase-imaging ion-cyclotron-resonance technique • Measure phase evolution of ions‘ eigenmotion instead of frequency • Gain in precision and resolving power S. Eliseev et al. Phys. Rev. Lett. 110 (2013). S. Eliseev et al. Appl. Phys. B, 13 (2013).

10. MINIBALL & T-REX • Post-accelerated RIBs from REX-ISOLDE • Coulomb excitation or nucleon transfer • g-ray and particle spectroscopy • MINIBALL: 24 segmented HPGe detectors • T-REX: Si detector array • Plans for future (to prepare • for HIE-ISOLDE) • new DAQ system • AC shields for MINIBALL • new Si detectors • MINIBALL detector repairs V. Bildstein et al., Eur. Phys. J. A 48, 85 (2012) N. Warr et al., Eur. Phys. J. A 49, 40 (2013)

11. S. Hellgartner, D. Mücher, ...

12. Onset of deformation in Kr at N=60 • 2+ state at 554 keV, not 241 keV • N. Marginean et al., Phys. Rev. C 80, 021301(R) (2009) • No sudden onset of deformation in • Kr at N=60 (different to Sr and Zr) • Change from prolate to oblate shape • between N=58 and 60 M. Albers et al., PRL 108, 062701 (2012), NP A 899, 1 (2013)

13. Shell stabilization in N=80 isotones?Observation of a local suppression in collectivity Gamma ray spectra Systematics of B(E2) values Nd-140: C. Bauer et al., PRC 88 (2013), 021302(R) Sm-142: R. Stegmann et al., in preparation for PRC Ba-140: C. Bauer et al., PRC 86 (2012), 034310. measured B(E2;2+0+) valuesof 140Nd and 142Sm interpreted as local suppression in collectivity for 138Ce at filled pg7/2 orbit TU Darmstadt | AG Pietralla | MINIBALL/REX-ISOLDE

14. Collectivity in even Cd isotopes • enhanced collectivity • for 122,124Cd • B(E2) in 126,128Cd agree with • shell model • irregular E(2+) in 128Cd 128Cd Ù • even Cd nuclei • rather spherical • ... similar to odd • Cd isotopes S. Ilieva et al., submitted to PRC S. Bönig et al., in preparation 27.08.2014 | TU Darmstadt | AG Kröll

15. Octupole collectivity in Ra and Rn … REX is going heavyweight!!! radioactive beams @ REX L.P. Gaffney, P. A. Butler (U Liverpool) M. Scheck (TU Darmstadt) et al., Nature 497, 199 (2013) • 224Ra, 220,221Rn … heaviest REX-ISOLDE beams • odd isotopes … search for atomic EDM

16. Stepwise upgrade • to 5.5 MeV/u ...10 MeV/u • higher intensities • better beam quality / purity • Set-up 2013-15 … • … 2017/18 (LINAC4) • Extension of physics • programme, e.g. • heavy nuclei (A≈200) • … as low-energy beams • unique to ISOLDE • Physics goals • multiple Coulomb excitation • nucleon transfer with heavy • beams • New instrumentation • IDS (ISOLDE Decay Station) • TSR … storage ring @ ISOLDE TSR IDS MINIBALL Superconducting LINAC

17. 2 The TSR@ISOLDE project Jura (west) side • Possible TSR installationabove the CERN service-tunnel • Tilted beamline coming upfrom the machine M. Grieser et al., EPJST 207, 1-117 (2012) service tunnel 36m 26m K. Blaum (MPI-K Heidelberg) 10m (7m between floor and crane hook) 4.73m above Isolde hall floor • First storage ring at an ISOL-facility • Scientific case approved by the INTC • Technical integration study submitted to the CERN management

18. ... the people behind ISOLDE ISOLDE Workshop 2012 2013 at ISOLDE ... mining a rich seam of data 21 publications in refereed journals e.g. 4 PRL, 3 Nature Many contributions to conferences Many Bachelor, Master and PhD theses based on work at ISOLDE ... important for universities!!! Several improvements are ongoing ISOLDE prepares to receive protons again from June 2014 Thanks to the contributors of the transparencies!!!