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Experiments with polarized beams at ISOLDE Dimiter L. Balabanski, INRNE

Experiments with polarized beams at ISOLDE Dimiter L. Balabanski, INRNE the Bulgarian involvement at ISOLDE alignment and polarization of exotic nuclei collinear laser spectroscopy @ ISOLDE alignment of isomers in transfer reactions

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Experiments with polarized beams at ISOLDE Dimiter L. Balabanski, INRNE

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  1. Experiments with polarized beams at ISOLDE • Dimiter L. Balabanski, INRNE • the Bulgarian involvement at ISOLDE • alignment and polarization of exotic nuclei • collinear laser spectroscopy @ ISOLDE • alignment of isomers in transfer reactions • tilted-foil polarization of exotic post-accelerated beams • overlap with the ESFRI Spiral2 project • on the road to the EURISOL facility R-ECFA meeting, Sofia

  2. The Bulgarian participation at ISOLDE • Bulgaria is not a member of ISOLDE! • The participation in the experiments is based on personal contacts and is financed by individual research grants. • Bulgarians at ISOLDE • early 1990s Prof. Krasimira Marinova – COLLAPS experiments in collaboration with Univ. Mainz • early 2000s Prof. Balabanski – COLLAPS and REX-ISOLDE experiments in collaboration with Univ. Leuven • 2005 – 2006 Dr. Georgi Georgiev – CERN fellow • since 2009 Dr. Deyan Yordanov – CERN fellow • FP6 EWON report (within EURONS) reporting on Bulgarian activities at ERI submitted to EC • in 2010 four experiments at ISOLDE with Bulgarian participation R-ECFA meeting, Sofia

  3. R-ECFA meeting, Sofia

  4. Spin-oriented beams magnetic moment () quadrupole moment (Q) single-particle configuration (configuration mixing) collective properties (deformation, effective charges) Nuclear moment measurements R-ECFA meeting, Sofia

  5. spin-alignment m -2 –1 0 +1 +2 spin-polarization m -2 –1 0 +1 +2 some definitions Spin-oriented beams R-ECFA meeting, Sofia

  6. I=2 ensemble classical view quantum-mechanical view m =2 m =-2 m =1 m =-1 m =0 I = 2 Population E Necessary to induce polarization of the beam prior the measurement ISOLDE – CERN SPIRAL2 ISOL beams R-ECFA meeting, Sofia

  7. Part III: Halo nuclei The Li chain Why is 11Li so big? R-ECFA meeting, Sofia

  8. Part III: Halo nuclei The COLLAPS beam line at ISOLDE know how: Univ. Mainz R-ECFA meeting, Sofia

  9. 9Li 11Li 0 1 5 2 0 2 5 (b) Li 2003 -4.0 A S YMME T R Y (%) .8 -5.0 .4 1992 -6.0 0 -7.0 -.4 -8.0 Zn Zn 10 15 20 10 15 20 25 Q(11Li) Q(9Li) = 1.090(14) 2004 7.0 6.2 Zn Zn A S YMME T R Y (%) 6.0 6.0 5.8 5.6 5.0 5.4 4.0 Dscan = nRF – nL,fix (kHz) 5.2 5.0 10 LiNbO33 16 22 10 16 22 LiNbO3 Dscan = nRF – nL,fix (kHz) Part III: Halo nuclei Quadrupole moments of Li isotopes: 11Li vs 9Li (U. Leuven – U. Mainz experiment) R-ECFA meeting, Sofia

  10. Part III: Halo nuclei Did we learn something from the Li chain ? We think: YES • A precision measurement of the electric quadrupole moments of 9,11Li reflects the charge distribution in these nuclei. The quadrupole moment of 11Li is found 9 ± 1% larger than that of 9Li. • This small difference supports the interpretation of the two-neutron halo. • The small but significant difference between both moments is a first direct proof that correlations between the halo and the core exist. D. Borremans, D.L. Balabanski,K. Blaum, W. Geithner, S. Gheysen, P. Himpe, M. Kowalska, J. Lassen,P. Lievens, S. Mallion, R. Neugart, G. Neyens, N. Vermeulen, and D. Yordanov R-ECFA meeting, Sofia

  11. Can we measure nuclear static moments with post-accelerated ISOL beams ? R-ECFA meeting, Sofia

  12. REX - ISOLDE@ CERN REX - ISOLDE R-ECFA meeting, Sofia

  13. 65Zn 67Zn P P 100Tc 102Tc 64Cu 66Cu 65Cu 63Cu 100Mo 98Mo 99Mo 101Mo Part IV: The future: Transfer reactions with RIBs Principle investigators: Georgi Georiev (Orsay) and DLB (Sofia) Why transfer reactions ? • populate low-spin (single-particle) states • go a step further in the Nuclear Terra Exotica R-ECFA meeting, Sofia

  14. Part IV: The future: Transfer reactions with RIBs The 63m,65mNi experiment (I = 9/2+) (d,p) reactions Tandem at IPN-Orsay • pulsed 6 MeV 1 nAD beam • enriched 64Ni/62Ni (ferromagnetic) targets • known g(63mNi) = - 0.269(3) • Muller et al. PR B40, 7633 (1989) • HF field of Ni(Ni) = 6.90(5) T • Riedi et al. PR B15, 5197 (1977) R-ECFA meeting, Sofia

  15. Larmor frequency Part IV: The future: Transfer reactions with RIBs Experimental results 63mNi 65mNi G. Georgiev et al, J.Phys.(London) G31, S1439 (2005) Ni exp. 2004 gexp. = -0.296 (3) HF field Ni(Ni) = 6.90(2) T ~ 15% alignment in transfer reactions at the Coulomb barrier (3 MeV/u) R-ECFA meeting, Sofia

  16. Polarized beams at HIE-ISOLDE – from dreams to reality Polarized beams – WHY? • Precise test of the nuclear models for exotic nuclei: • transfer reactions(analyzing power) • Coulomb excitation – spin/parity;multiplicity assignments etc. • nuclear moments – proton/neutron character, angular momentum j G. Georgiev1, M. Hass2, A. Herlert3, D.L. Balabanski4, L. Hemmingsen5, K. Johnston3, M. Lindroos3, K. Riisager6, J. Van de Walle3, D. Voulot3, F. Wenander3, W.-D. Zeitz7 1. CSNSM, Orsay, France; 2. The Weizmann Institute, Rehovot, Israel; 3. ISOLDE, CERN, Geneva, Switzerland; 4. INRNE, BAS, Sofia, Bulgaria; 5. IGM, LIFE, University of Copenhagen, Denmark; 6. Department of Physics and Astronomy, University of Aarhus, Denmark; 7. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Germany R-ECFA meeting, Sofia

  17. M. Hass et al., NPA 414, 316 (84) Can one do it and how? • Tilted Foils - the principles: • atomic polarization  nuclear polarization • higher nuclear spins  higher polarization (>10% achieved so far) • strong velocitydependence (poorly studied up to now) • Can one post-accelerate the ions after polarizing them? • done for stable beams - noble-gas like charge states + LINAC J. Bendahan et al., ZPA 331, 343 (88) R-ECFA meeting, Sofia

  18. 3 MeV/u and 0.3 MeV/u What do we need to achieve it? • b-NMR setup from HMI Berlin transferred to ISOLDE • gain of complete control on the TF polarization • nuclear structure (moments, reactions …),nuclear methods in the solid-state physics, biophysics etc. … - unique opportunity R-ECFA meeting, Sofia

  19. SPIRAL 2 SPIRAL2 is a new European facility to be built at GANIL laboratory in Caen, France. The project aims at delivering stable and rare isotope beams with intensities not yet available with present machines. SPIRAL2 will reinforce the European leadership in the field of nuclear physics based on exotic nuclei. The scientific programme proposes the investigation of the most challenging nuclear and astrophysics questions aiming at deeper understanding of the nature of matter. R-ECFA meeting, Sofia

  20. The SPIRAL 2 project R-ECFA meeting, Sofia

  21. SPIRAL2 EFFORT • MoU between GANIL and INRNE, BAS • participation in the Spiral2PP project (FP7 Infrastructures); • production of prototypes for the superconducting LINAC; • participation in the construction of the PARIS spectrometer; • declared interest in the Spiral2 scientific programme. R-ECFA meeting, Sofia

  22. EURISOL: The Main Challenges • Design a 5MW; 1GeV proton driver with additional capability of 200 AMeV deuterons and A/Q=2 Heavy Ions; build and test prototypes of the cavities. • Design a liquid Hg converter which will accept 5 MW of beam power. • Design a UCx target which will make the most efficient use of the neutrons produced. • Evaluate the safety constraints of the above set up. • Design an efficient multi-user beam distribution system. • Design a superconducting HI LINAC capable of accelerating 132Sn up to 150 AMeV • Investigate technologies for the instrumentation of the future • Provide a conceptual study for a beta-beam neutrino facility. R-ECFA meeting, Sofia

  23. EURISOL layout R-ECFA meeting, Sofia

  24. R-ECFA meeting, Sofia

  25. Thank you for your attention ! R-ECFA meeting, Sofia

  26. R-ECFA meeting, Sofia

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