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Peter Reiter Universit ä t zu K ö ln Folie: 1 Bericht zu ISOLDE Low-energy precision experiments: –Laser Spectroscopy – COLLAPS –Mass Spectrometry – ISOLTRAP.

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Presentation on theme: "Peter Reiter Universit ä t zu K ö ln Folie: 1 Bericht zu ISOLDE Low-energy precision experiments: –Laser Spectroscopy – COLLAPS –Mass Spectrometry – ISOLTRAP."— Presentation transcript:

1 Peter Reiter Universit ä t zu K ö ln Folie: 1 Bericht zu ISOLDE Low-energy precision experiments: –Laser Spectroscopy – COLLAPS –Mass Spectrometry – ISOLTRAP –Weak Interaction Studies – WITCH Post-accelerated beam experiments: REX-ISOLDE HIE-ISOLDE KHuK Jahrestagung 2011 Physikzentrum Bad Honnef Dezember 2011

2 ISOLDE – Some statistics BMBF-Funding (~10% contribution to the ISOLDE collaboration): German contribution to ISOLDE: 40 t / year to HIE-ISOLDE: 40 t / year ISOLDE-Collaboration: 13 member states + CERN YearShifts requested Shifts scheduledShifts delivered 2009 ~480 ~ ~500 ~ ~650 ~ shift = 8h of protons on the target 18 experiments out of 50 scheduled in 2011 have spokesperson presently at a German institute. >60 publications / year (among them ~10 Phys. Rev. Lett.) >20 PhD students / year > 80% high reliability!

3 The ISOLDE facility ISCOOL (Mainz, MPIK) Hall extension New targets RILIS Upgrade (Mainz) New target laboratory (class A lab) WITCH GSI Darmstadt MPIK Heidelberg University Mainz University Münster University Tübingen GSI Darmstadt MPIK Heidelberg University Dresden University Greifswald University Bonn University Darmstadt University Köln LMU Munich TU Munich University Münster The (HIE-)ISOLDE facility

4 Farbstoff-Laser Titan-Saphir-Laser ISOLDE/RILIS Kabine - Panoramaansicht Bisheriges Farbstoff Lasersystem ISOLDE Neues Titan:Saphir Lasersystem Upgrade ISOLDE/RILIS Lasersystems (K. Wendt, Mz)

5 Beam developments (K. Wendt, Mz) Laser Ion Source Trap (LIST) highly selective laser ion source: - fully commissioned - at HRS front-end production of 21 Na, 27 Mg - highest selectivity (gain ) - acceptable efficiency (loss 50) - preparation of purest ion beams! Beam developments are of utmost importance for the success of ISOLDE. New astatine RILIS beams

6 COLLAPS: Collinear laser spectroscopy electrostatic deflection photo multiplier o ion beam E kin <60 keV laser beam fixed frequency electrostatic lenses for retardation charge exchange cell (Na) excitation & observation reg. o fine Mg HFS of fine Doppler tuning voltage (V) photons 25 Mg HFS of 6.5 GSI, Mainz, MPIK, Münster, Tübingen Technically challenging: Frequency-comb based spectroscopy and high-voltage calibration.

7 COLLAPS harvest (GSI, Mz, MPIK, Tüb) Proposals at COLLAPS: Data Taking, in Preparation, Just Completed Cu, Ga, Zn Mg Be Cd IS427, IS480 (G. Neyens, Leuven) PRC 77, (2008) IS480 (K. Blaum, MPIK Heidelberg) PLB 678,465 (2009) IS439 (K. Flanagan, CERN) PRL 103, (2009) IS457 (B. Cheal, Manch.) PRL 104, (2010) IS519 (B. Cheal, Manch.) PRC 82, (R) (2010) IS449 (W. Nörtershäuser & Ch. Geppert, Mainz) PRL 102, (2009) K IS497 (D. Yordanov, MPIK) IS484 (G. Neyens, Leuven) Pr IS517 (Ch. Geppert, Mainz) 2008 – 2010: 15 Publications (6 x Phys. Rev. Lett) 3 PhD and 3 master theses (Mainz + MPIK) + 2 PhD + 1 Master (Leuven, Manchester)

8 IS 484: Disappearance of the N=8 shell closure from comparison of Be charge radii with fermionic molecular dynamics calculations. intruder 11 Be: W. Nörtershäuser,et al; Phys. Rev. Lett. 102, (2009) 12 Be: A. Krieger, T. Neff et al., submitted to Phys. Rev. Lett. Charge radii of 11,12 Be (W. Nörtershäuser, Mz)

9 ISOLTRAP: Penning trap mass spectrometry Dresden, Greifswald, GSI, MPIK B q/mq/m ring electrode end cap Remarkable: accessible half-life: t 1/2 ~ 10ms required yield: 0.5 ions / s achieved precision: m/m = 2 x 10 -9

10 ISOLTRAP Highlights (L. Schweikhard, Greifswald; K. Zuber, Dresden; K. Blaum, MPIK) Dresden, Greifswald, GSI, MPIK W. Geithner et al., Phys. Rev. Lett., 101, (2008) M. Breitenfeld et al., Phys. Rev. C 80, (2009) R.B. Cakirli et al., Phys. Rev. Lett., 102, (2009) D. Neidherr et al., Phys. Rev. C., 80, (2009) D. Neidherr et al., Phys. Rev. Lett., 102, (2009) M. Breitenfeld et al., Phys. Rev. C 81, (2010) S. Eliseev et al., Phys. Lett. B 693, 426 (2010) S. Naimi et al., Phys. Rev. Lett. 105, (2010) New Proposals: IS498 (Sm, Eu, Gd) IS513 (Tl, Hf) IS518 (At, Au, Fr)

11 Neutrino masses and traps Neutrinoless double decay: (A,Z) (A,Z+2) + 2 e - 0 Signal: Peak at the Q-value of the transition Aim: Measure all of them with < 1 keV accuracy 11 Isotopes with Q-value larger than 2 MeV IsotopeAME 2003Q-values 2011 Ca ± 4 Ge ±0.050 Se ± 1.9 Zr ±2.2 Mo ± ± 0.17 Pd ± ±0.64 Cd ± ±0.13 Sn ±1.5 Te ± ± Xe ± ±0.37 Nd ± ± 0.20 Example: 110 Pd D. Fink et al., Phys. Rev. Lett. accepted

12 Precision measurement of the e- -angular correlation a a = 1 is favored The WITCH experiment at ISOLDE/CERN WITCH – Universität Münster Leuven, Caen, Darmstadt, Karlsruhe, Mainz, Rez, Münster

13 Precision measurement of the e- -angular correlation a a = 1 is favored The WITCH experiment at ISOLDE/CERN WITCH – Universität Münster Leuven, Caen, Darmstadt, Karlsruhe, Mainz, Rez, Münster 3 beam times with 35 Ar in 2011 PRELIMINARY

14 REX-ISOLDE: Post-accelerated ion beams Darmstadt, Köln, München 300 keV/u to 3 MeV/u isomeric beams due to RILIS acceleration scheme works from Li to Ra

15 REX-ISOLDE experiments Oblate shapes? molecular beams Towards 100 Sn Quadrupole Collectivity around 132 Sn g-factors Shape coexistence around Pb Shell evolution N=40 to N=50 isomeric beam, in-trap decay Island of Inversion MINIBALL Results Island of Inversion PLB, 700 ( 2011) 181 PRL105, (2010) PRL103, (2009) PLB 647, 237 (2007) PRL 94, (2005) Shell evolution PRC 82, (2010) PRC 79, (2009) PRC 78, (2008) PRL 100, (2008) PRL 99, (2007) PRL 98, (2007) Towards 100 Sn EPJ. A 44 (2010) 355 PRC 80, (2009) PRL 101, (2008) PRL. 98, (2007) Oblate shapes PRL 98, (2007) T. Kröll/N. Pietralla, TUD, R. Krücken/D. Mücher, TUM, J. Jolie/P. Reiter, UK

16 Transfer-reactions at MINIBALL (R. Krücken/D. Mücher, TUM T. Kröll/N. Pietralla, TUD) T-REX detectors K. Wimmer et al.; PRL 105, (2010): t( 30 Mg, 32 Mg)p E0(?) E keV t( 30 Mg, 32 Mg)p Study of shell evolution in neutron-rich nuclei using one- and two-neutron transfer reactions IS499: t( 44 Ar,p) 46 Ar K. Wimmer, TUM, MSU IS510: t( 72 Zn,p) 74 Zn D. Mücher, TUM

17 -Spektroscopy with MINIBALL (P. Reiter, Köln) Particle detection MINIBALL 31 Mg 30 Na 30 Na ((3 + ) 2 + ) 30 Na ((4 + ) (3 + )) 30 Na ((4 + ) 2 + ) 31 Mg Coulex PLB, 700 ( 2011) 181 Odd isotopes in island of inversion provide most stringent and sensitive tests of large scale shell model calculations Ongoing program at Coulex and transfer 30,31 Na, 33 Mg

18 Aktuelle Projekte Gruppe Kröll, Gruppe Pietralla Senior Investigators: M. Scheck, J. Leske, G. Rainovski (Humboldt fellow) Laufende und in Analyse befindliche Experimente: Collective excitations of radioactive isotopes in Coulomb excitation (IS 411, 452, 465, 475, 477, 496) island of inversion (IS 502) magnetic moments in neutron-rich isotopes (IS 415, 483) Masserekord für ISOL-RIB Machbarkeit von E3-Coulex an ISOL-RIB Messung magnetischer Momente kurzlebiger angeregter Zustände an REX-ISOLDE demonstriert: RIB 138 Xe

19 Nuclear structure of n-rich Kr (J. Jolie, Köln) A~100 mass region: phase shape transitions from spheric to deformed nuclei. E(2 + 1 ) and B(E2; ) studies New B(E2) values for 92,94 Kr and 96 Kr New result for the energy of the state in 96 Kr Smooth transition from spheric to deformed nuclear shapes in the neutron-rich Kr region. Number of neutrons Sr Zr S. Naimi et al., Phys. Rev. Lett. 105 (2010) M. Albers et al., Phys. Rev. Lett. submitted

20 Increase of REX-ISOLDE energy (up to 10 MeV/u) Increase of primary beam intensity (LINAC4, 6 A) Improvement of secondary beam production efficiency (RILIS, new frontends and targets) Improvement of beam purity (RILIS/LIST) Improvement of beam optical quality (ISCOOL) The HIE-ISOLDE project

21 Heavy-ion storage ring TSR at MPIK In operation: since 1988 Circumference: 55 m Vacuum: ~ mbar Acceptance: 120 mm mrad Multi-turn injection: mA current Electron cooler Electron target RF (de)acceleration Typical energy 12 C 6+ : 6-10 MeV/u Lifetime: hours Ion Storage Ring TSR, Time schedule: - End of operation of TSR in 12/ Preparation for a move of the TSR to ISOLDE in Installation of the TSR at ISOLDE as soon as the building is ready

22 ISOLDE is one of the most active places for experiments with radioactive ion beams. Interest to perform experiments at ISOLDE is increasing. German groups obtained numerous scientific highlights at ISOLDE in recent years. HIE-ISOLDE and offers unique perspectives. Thanks a lot to many colleagues who provided material. Summary


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