ISOLDE Workshop 2009 1/XX Nuclear Charge Radii of Mg Isotopes by Laser Spectroscopy with Combined Fluorescence and β-decay Detection J. Krämer 1, D.T.

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ISOLDE Workshop /XX Nuclear Charge Radii of Mg Isotopes by Laser Spectroscopy with Combined Fluorescence and β-decay Detection J. Krämer 1, D.T. Yordanov 2, M.L. Bissell 3, K. Blaum 2, M. De Rydt 3, Ch. Geppert 1,4, M. Hammen 1, K. Kreim 2, A. Krieger 1, M. Kowalska 5, R. Neugart 1, G. Neyens 3, W. Nörtershäuser 1,4, R. Sanchez 4, B. Sieber 1, P. Vingerhoets 3 1 Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, D Mainz, Germany 2 Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D Heidelberg, Germany 3 Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium 4 GSI, D Darmstadt, Germany 5 CERN, Physics Department, CH-1211 Geneva 23, Switzerland

ISOLDE Workshop /XX Nuclear Charge Radii of Mg Isotopes by Laser Spectroscopy with Combined Fluorescence and β-decay Detection J. Krämer 1, D.T. Yordanov 2, M.L. Bissell 3, K. Blaum 2, M. De Rydt 3, Ch. Geppert 1,4, M. Hammen 1, K. Kreim 2, A. Krieger 1, M. Kowalska 5, R. Neugart 1, G. Neyens 3, W. Nörtershäuser 1,4, R. Sanchez 4, B. Sieber 1, P. Vingerhoets 3 1 Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, D Mainz, Germany 2 Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D Heidelberg, Germany 3 Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium 4 GSI, D Darmstadt, Germany 5 CERN, Physics Department, CH-1211 Geneva 23, Switzerland

ISOLDE Workshop /XX The  detection method polarization λ=280.36nm

ISOLDE Workshop /XX Shell Structure of Mg Isotopes - „Island of Inversion“ pf sd d 5/2 2s 1/2 1d 3/2 1f 7/2 2p 3/2 30 Mg (Z=12, N=18) pf sd d 5/2 2s 1/2 1d 3/2 1f 7/2 2p 3/2 32 Mg (Z=12, N=20) pf sd d 5/2 2s 1/2 1d 3/2 1f 7/2 2p 3/2 31 Mg (Z=12, N=19) 2p-2h  = (15)  N  Theory =  N  Schmidt = -1.9  N pf sd d 5/2 2s 1/2 1d 3/2 1f 7/2 2p 3/2 33 Mg (Z=12, N=21) 2p-2h  = −0.7456(5)  N  Theory =  N  Schmidt = -1.9  N

ISOLDE Workshop /XX F Ne Na Mg Al Si N Z 31 Mg 29 Na 28 Ne 34 Al 32 Mg 33 Mg 34 Mg 30 Na 31 Na 30 Ne The “island of inversion” in terms of the SPHERICAL shell model. The height of the boxes represents the amount of particle-hole configurations present in the ground-state wave functions. (analogous to a figure from P. Himpe et. al., Phys. Lett. B 658, 203 (2008). ) The Island of Inversion an Island of Deformation?

ISOLDE Workshop /XX Does Deformation Explain the 31,33 Mg spins and moments? Q S ( 31 Mg)=0. Quadrupole-moment measurements of 29,33 Mg - not feasible; Necessity of a common observable for all isotopes in order to detect the transition to a deformed configuration; E sp (MeV) 33 Mg, I  = 3/2 (-) 1/2[330]:  =  N 3/2[202]:  =  N 3/2[321]:  =  N 31 Mg, I  = 1/2 + 1/2[200]:  =  N 31 Mg  = (15)  N 33 Mg  = (5)  N

ISOLDE Workshop /XX F=0 3 2 P 3/2 D2D2 3 2 S 1/2 F=1 F=2 F=1 01mFmF 01mFmF g F = 1.7 g F = 1.0 F=0 3 2 P 3/2 D2D S 1/2 F=1 F=2 F=1 mFmF 01mFmF g F = 1.0 Influence of the guiding field on the atomic lines: shift broadening One can solve numerically the rate equations and quantitatively describe these effects. M. Keim et al., Eur. Phys. J. A 8, 31 (2000). B = 0B > 0 Isotope shifts by  detection  i AA = K i (m-m)/(mm)+F i  r 2  AA

ISOLDE Workshop /XX HFS 31 Mg II, D 2 Simulated spectra of 31 Mg II, D 2 M. Kowalska et al., Phys. Rev. C 77, (2008). Isotope shifts by  detection

ISOLDE Workshop /XX First use of  detection for isotope-shift measurments 29 Mg optical 29 Mg  asym. 30 Mg triggered on the release 31 Mg  asym. 32 Mg photon-ion coincidence Preliminary Results on 24 Mg - 32 Mg from September 2009 Proof of principle: 29 Mg optical and  detection are consistent! 29 Mg 1.2  10 6 ions/  C 30 Mg 4.6  10 5 ions/  C 31 Mg 1.5  10 5 ions/  C 32 Mg 4.2  10 4 ions/  C 33 Mg 5.3  10 3 ions/  C 21 Mg 3  10 3 ions/  C 21 Na 4  10 8 ions/  C

ISOLDE Workshop /XX Charge radii of Magnesium Isotopes King plot K SMS = 367,3(3) GHz u radii from muonic data theoretical calculation Fricke et al., Phys. Rev. C45 (1992) 80 Berengut et al., Phys. Rev. A68 (2003) electronic factor F Isotope shifts reference radius: r C ( 26 Mg) =3.034(2) fm Fricke et al., Phys. Rev. C45 (1992) 80 PRELIMINARY

ISOLDE Workshop /XX Discussion: PRELIMINARY PRELIMINARY values for Na taken from Huber et al., Phys. Rev. C18 (1978) 2342 Otten, Treat. Heav. Ion Sci. 8 (1989) 515 radii Mg and Na reveal similar trend Indication for an effect at 30 Na and 31 Mg Isotope 31 Mg Mg Mg0.164 staggering parameter <1, well within the known systematics Isotope shift 24 Mg- 26 Mg: 3077(2)(9) MHz-in agreement with trap measurement: (93) MHz Batteiger et al. Phys. Rev. A80 (2009)