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The Many Faces of Laser Spectroscopy at ISOLDE: Probing the Nuclear Structure

The Many Faces of Laser Spectroscopy at ISOLDE: Probing the Nuclear Structure of Exotic Be, Mg, Cu and Ga Isotopes. ISOLDE Workshop, Nov 2008. collinear-anticollinear method with a frequency comb. Halo nuclei. Be. Li. He. rms matter radius (fm). 11 Be. A.

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The Many Faces of Laser Spectroscopy at ISOLDE: Probing the Nuclear Structure

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  1. The Many Faces of Laser Spectroscopy at ISOLDE: Probing the Nuclear Structure of Exotic Be, Mg, Cu and Ga Isotopes ISOLDE Workshop, Nov 2008

  2. collinear-anticollinear method with a frequency comb Halo nuclei Be Li He rms matter radius (fm) 11Be A Matter radii from interaction cross sections I. Tanihataet al., Phys. Lett. B 206, 592 (1988) ISOLDE Workshop, Nov 2008

  3. collinear-anticollinear method with a frequency comb First use of a frequency comb at ISOLDE collinear anti-collinear Collinear anti-collinear spectroscopy with a frequency comb for absolute frequency determination of 7,9,10,11Be+ Presentation by Christopher Geppert 9Be 10Be number of counts a.b. 11Be W. Nörtershäuser et al., Phys. Rev. Lett., accepted n-nA (GHz) 2s1/2 → 2p1/2 ISOLDE Workshop, Nov 2008

  4. collinear-anticollinear method with a frequency comb Experiment versus Theory rms charge radius (fm) A experiment No-Core Shell Model Fermionic Molecular Dynamics from interaction cross section exp. Greens-Function Monte-Carlo Calculations W. Nörtershäuser et al., Phys. Rev. Lett., accepted ISOLDE Workshop, Nov 2008

  5. collinear-anticollinear method with a frequency comb The simplified Halo picture of 11Be 11Be n 10Be W. Nörtershäuser et al., Phys. Rev. Lett., accepted ISOLDE Workshop, Nov 2008

  6. RFQ cooling and bunching method First use of a RFQ for laser spectroscopy at ISOLDE Tests of spin hypotheses and spin determination A(S1/2) / A(P3/2) 4p 2P3/2 → 5s 2S1/2 79Ga, I=3/2 A counts presentation by Ernesto Mané 500 MHz per division ISOLDE Workshop, Nov 2008

  7. RFQ cooling and bunching method Spectroscopy of exotic copper isotopes 75Cu, I=5/2 (left) 75Cu (right) 100 counts per division 50 counts per division 4s 2S1/2 → 4p 2P3/2 GHz GHz P. Vingerhoets, PhD in progress K. Flanagan, P. Vingerhoets, publications in preparation ISOLDE Workshop, Nov 2008

  8. RFQ cooling and bunching method High-resolution g-factors of the odd-A cases single-particle g(p 2p3/2) single-particle-like ground state of 75Cu (I=5/2) g factor N=40 COLLAPS I=3/2 single-particle g(p 1f5/2) A • Theory: • reproduces the trend between 59 - 69Cu; • does not describe the drop towards 75Cu; • does not match with the value of 57Cu; P. Vingerhoets, PhD in progress K. Flanagan, P. Vingerhoets, publications in preparation ISOLDE Workshop, Nov 2008

  9. RFQ cooling and bunching method Monopole migration of the p 1f5/2 orbital; Inversion at 75Cu 75Cu, I=5/2 p 2p1/2 p 1f5/2 p 2p3/2 S. Franchoo et al., Phys. Rev. C 64, 054308 (2001). I. Stefanescu et al., Phys. Rev. Lett. 100, 112502 (2008). ISOLDE Workshop, Nov 2008

  10. RFQ cooling and bunching method Quadrupole moments of the odd-A cases Comparison to B(E2) values B(E2): 1/2 → 3/2 B(E2): 5/2 → 3/2 N=40 Q, COLLAPS Q and B(E2) relative to 63Cu A • B(E2) from: I. Stefanescuet al., Phys. Rev. Lett. 100, 112502 (2008). • minimum at N=40 for all; • no evidence for big changes in the collectivity of the ground state from the Q moments; ISOLDE Workshop, Nov 2008

  11. b detection method and NMR B = The b - NMR technique post-acceleration lenses crystal-stopper magnet scintillation detectors optical detection electrostatic deflection B T X+ RF coil optical-pumping region laser beam F=1 32P3/2 F=2 -2 -1 0 1 2 mF mI = +1/2 F=0 D2 I=1/2 hDn = gBmN 32S1/2 F=1 mI = -1/2 -1 0 1 mF ISOLDE Workshop, Nov 2008

  12. b - detection method and NMR NMR 21Mg, MgO nLarmor (MHz) n (MHz) Spin and magnetic moment 21Mg preliminary |A(g)| (I+1/2) HFS 21Mg II, D2 NMR • the mirror partner 21F (T=3/2) has a known magnetic moment; • extracted the isoscalar and isovector parts of the magnetic moment; • J. Krämer, PhD and paper in progress. ISOLDE Workshop, Nov 2008

  13. b - detection method and NMR Spin expectation value for A=21 preliminary σ j=l+1/2 = 1 m(Tz) + m(-Tz) - I σ = mp + mn - 1/2 σ j=l-1/2 = -j/(j+1) A • m(21Mg) + m(21F) > mn d5/2 + mp d5/2, contrary to the systematics, σ = 1.15(2); • higher value than the shell-model prediction → isospinnonconservation; • to understand of the isovector moment in light of the decay properties; • J. Krämer, PhD and paper in progress. ISOLDE Workshop, Nov 2008

  14. b - detection method and NMR (NQR) Quadrupole moment of the two-neutron halo 11Li NQR of 11Li in Zn 1% asymmetry per division |Q| (mb) 17 kHz 1 kHz per division A p-sd shell model AMD 9Li - 11Li: |DQ / Q| = 8.8(15)% R. Neugart et al., Phys. Rev. Lett. 101, 132502 (2008). 9Li - 11Li: Dr21/2 / r21/2 = 11(2)% R. Sánchez et al., Phys. Rev. Lett. 96, 033002 (2006). NCSM cluster ISOLDE Workshop, Nov 2008

  15. Collisional-ionization method Cluster correlations in Ne isotopes COLLAPS [1] Ne Fricke & Heilig [2] FMD [1] rms charge radius (fm) N [1] W. Geithner et al., Phys. Rev. Lett. (2008), submitted. [2] G. Fricke and K. Heilig, Nuclear Charge Radii, vol. I / 20 (Springer, 2004), ISBN 3-540-42829-1. ISOLDE Workshop, Nov 2008

  16. Collisional-ionization method The collisional-ionization technique tape stations with b detection optical detection electrostatic deflection X+ post-acceleration lenses gas target (Cl2) charge-exchange cell normalized ion count rate 17Ne U (kV) ISOLDE Workshop, Nov 2008

  17. C. Geppert**, J. Krämer, A. Krieger, R. Neugart, W. Nörtershäuser**, D. Tiedemann, M. Žáková Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany K. Blaum and D. T. Yordanov Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany M. Avgouleva, M. L. Bissell, M. De Rydt, K. Flanagan*, G. Neyens, and P. Vingerhoets Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium J. Billowes, B. Cheal, and E. Mane University of Manchester, Manchester, M13 9PL United Kingdom D. H. Forest School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK R. Sánchez GSI, D-64291 Darmstadt, Germany M. Kowalska CERN, Physics Department, CH-1211 Geneva 23, Switzerland P. Lievens Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium H. H. Stroke New York University, New York, NY-10003, USA * current affiliation: IPN Orsay, 15 Rue Georges Clemenceau, Orsay, France, 91406 ** second affiliation: GSI, D-64291 Darmstadt, Germany With respect to the authors of the work on Li and Ne!!! ISOLDE Workshop, Nov 2008

  18. ISOLDE Workshop, Nov 2008

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