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Moments and spins of neutron rich Mg isotopes: towards 33 Mg

Moments and spins of neutron rich Mg isotopes: towards 33 Mg Leuven - Mainz - ISOLDE collaboration at CERN D. T. Yordanov 1 , M. Kowalska 2,3 , K. Blaum 2 , K. Flanagan 1 , P. Himpe 1 , P. Lievens 4 , S. Mallion 1 , N. Vermeulen 1 , W . Nörtershäuser 2 , R. Neugart 2 and G. Neyens 1

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Moments and spins of neutron rich Mg isotopes: towards 33 Mg

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  1. Moments and spins of neutron rich Mg isotopes: towards 33Mg Leuven - Mainz - ISOLDE collaboration at CERN D. T. Yordanov1, M. Kowalska2,3, K. Blaum2, K. Flanagan1, P. Himpe1, P. Lievens4, S. Mallion1, N. Vermeulen1, W. Nörtershäuser2, R. Neugart2 and G. Neyens1 1 Instituut voor Kern- en Stralingsfysica, K.U.Leuven, Leuven, Belgium 2 Insititut für Physik, Universität Mainz, Mainz, Germany 3 CERN, Physics Department – IS, Geneva, Switzerland 4 Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U.Leuven, Leuven, Belgium ISOLDE Workshop 2006

  2. Table of Isotopes in the vicinity of The Island of Inversion Normal or not measured This Work Measured Intruder • nuclear moments and hyperfine structure of 25, 27, 29, 31, 33Mg ISOLDE Workshop 2006

  3. HFS 27Mg1+ D1, I=1/2 photon counts -Agr -Aex 27Mg (Z=12, N=15) I=1/2+ 20 1d3/2 -3Agr -3Aex 2s1/2 HFS 25Mg1+ D1, I=5/2 1d5/2 photon counts 8 8 p n msd = -0.42 mN, mexp = -0.4110(15) mN mSchmidt = -1.91 mN Hyperfine structure of 25, 27Mg ISOLDE Workshop 2006

  4. 3Aex + Bex b asymmetry 2Agr HFS 29Mg1+ D2, I=3/2 HFS 25Mg1+ D2, I=5/2 -3Agr photon counts b asymmetry NMR 29Mg, MgO Aex,Bex nL=1426.6(24) kHz HFS and NMR of 29Mg ISOLDE Workshop 2006

  5. 3Aex + Bex b asymmetry 2Agr HFS 29Mg1+ D2, I=3/2 29Mg (Z=12, N=17) HFS 25Mg1+ D2, I=5/2 I=3/2+ 20 1d3/2 -3Agr photon counts 2s1/2 1d5/2 Aex,Bex 8 8 p n Qsd= -95 mb, Qexp= -107(25) mb msd= 0.96 mN, mexp= 0.9795(15) mN , mSchmidt= 1.15 mN HFS and NMR of 29Mg ISOLDE Workshop 2006

  6. HFS 31Mg1+ D2, I=1/2 b asymmetry NMR 31Mg, MgO nL=3859.73(18) kHz gcorr = -1.7671(3) b asymmetry HFS and NMR of 31Mg [1] G. Neyens et al., Phys. Rev. Lett. 94, 022501 (2005) ISOLDE Workshop 2006

  7. 31Mg (Z=12, N=19) spE (MeV) 1f7/2 I=1/2+ 20 1d3/2 2s1/2 1d5/2 8 8 p n msd-pf = -0.84 mN, mexp = -0.88355(15) mN 1p – 1h Neutron single particle levels Woods-Saxon potential 31Mg, experimental level scheme [1] F. Marechal et all., Phys. Rev. C 72, 044314 (2005) [2] H. Mach et al., EPJ A 25 (2005) [3] G. Klotz et al., Phys. Rev. C 47, 2502 (1993) 2p – 2h ISOLDE Workshop 2006

  8. HFS of 33Mg HFS 33Mg1+ D2 • A(33Mg,32S1/2) ± 15% • gI(33Mg) ± 15% A(33Mg,32S1/2) b asymmetry dn 33, 31 HFS 31Mg1+ D2 [1] S. Nummela et al., Phys. Rev. C 64, (2001) I = (3/2+) [2] B. V. Pritychenko et al., Phys. Rev. C 65, (2002) I = (5/2+) Preliminary (11) (12) n(a.u.) ISOLDE Workshop 2006

  9. Conclusions & Outlook • 27,29Mg are far out of the Island of Inversion • 31Mg has nearly pure 2p-2h intruder gr. state • The first exited states also have intruder nature • Unambiguously determine the gr. state spin of 33Mg by NMR • Access the deformation through rms charge radii ISOLDE Workshop 2006

  10. Conclusions & Outlook • 27,29Mg are far out of the Island of Inversion • 31Mg has nearly pure 2p-2h intruder gr. state • The first exited states also have intruder nature • Unambiguously determine the gr. state spin of 33Mg by NMR • Access the deformation through rms charge radii ISOLDE Workshop 2006

  11. 1.4 GeV protons from PSB GPS Target GPS RILIS Laser Ion Source COLLAPS ISOLDE - CERN 1.4 GeV protons from PSB GPS Target Radioactive Laboratory Robots GPS HRS Target HRS RILIS Laser Ion Source Control Room REX - ISOLDE COLLAPS ISOLTRAP ISOLDE Workshop 2006

  12. PM - Optical Detection X1+ Ion Beam Electrostatic Deflection RF Coil Coils – Weak Field Post Acceleration Lenses Coils – Weak Field F=1 UV Laser Beam 32P3/2 F=2 -2 -1 0 1 2 mF b Detectors mI = +1/2 Magnet Magnet F=0 D2 I=1/2 → → → → B┴ B װ B┴ B װ 32S1/2 F=1 -1 0 1 mF mI = -1/2 COLLAPS @ ISOLDE N X1+ Ion Beam PM - Optical Detection Electrostatic Deflection RF Coil Post Acceleration Lenses UV Laser Beam S b Detectors ISOLDE Workshop 2006

  13. Nuclear Magnetic Resonance Nuclear Orientation HyperFine Structure Optical Pumping F=1 32P3/2 F=2 -2 -1 0 1 2 mF F=0 D2 32S1/2 F=1 -1 0 1 mF ISOLDE Workshop 2006

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