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Experiments with Stored Exotic Nuclei at Relativistic Energies  The Experimental Facility  Mass measurements  Lifetime measurements  Future Hans Geissel,

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Presentation on theme: "Experiments with Stored Exotic Nuclei at Relativistic Energies  The Experimental Facility  Mass measurements  Lifetime measurements  Future Hans Geissel,"— Presentation transcript:

1 Experiments with Stored Exotic Nuclei at Relativistic Energies  The Experimental Facility  Mass measurements  Lifetime measurements  Future Hans Geissel, Y. Litvinov, GSI and JLU Giessen Japanese-German Nuclear Structure and Astrophysics Workshop Dec. 16-18, 2004

2 Hans Geissel, Japanese-German Workshop The Team F. Attallah a, K. Beckert a, P. Beller a, F. Bosch a, D. Boutin a, M. Falch c, T. Fästermann f, B. Franczak a, B. Franzke a, Y. Fujita, H. Geissel a,d, M. Hausmann a, M. Hellström a, E. Kaza a, Th. Kerscher c, O. Klepper a, H.-J. Kluge a, C. Kozhuharov a, K.L. Kratz e, K.E.G. Löbner c, Yu.A. Litvinov a,b, S. Litvinov b, M. Matoš a, L. Maier f, G. Münzenberg a,e, F. Nolden a, Yu.N. Novikov b T. Ohtsubo h, A. N. Ostrowski e, Z. Patyk g, B. Pfeiffer e, M. Portillo a, T. Radon a, C. Scheidenberger a, J. Stadlmann a, M. Steck a, K. Sümmerer a, D. Vieira, H. Weick a, M. Winkler a, H. Wollnik d,, T. Yamaguchi a

3 Monoisotopic Fragment Beams Stored in the ESR Experimental Facilities

4 Precision Mass Measurements in the ESR Isochronous Mass SpectrometrySchottky Mass Spectrometry

5 Precision Mass Measurements in the ESR

6 Detector for Isochronous Mass Measurements in the ESR Carbon foil, ~20  g / cm 2 CsI coating 10  g / cm 2 diameter 40 mm Magnetic field: 10 mT Chevron arrangement of 2 MCPs diameter 40 mm

7 Hans Geissel, Japanese-German Workshop Schottky Mass Spectrometry 950 MeV/u 209 Bi + Be  Projectile Fragments New and Reference Masses in the same Spectrum High Resolution and Sensitivity accuracy: 30 keV

8 Proof of Single Atoms Stored in the ESR frequency [Hz] noise power density a.u. Yu. Litvinov

9 Hans Geissel, Japanese-German Workshop Accuracy of Schottky Mass Measurements T. Radon, Yu. Litvinov σ = 30 keV SMS 2003

10 Hans Geissel, Japanese-German Workshop Comparison to ISOLTRAP Yu. Litvinov J. Dilling, PHD Thesis, Heidelberg, 2001F. Ames et al., Nucl. Phys. A651, 3 (1999) S. Schwarz et al., Nucl. Phys. A693, 533 (1999) A. Kohl, PHD Thesis, Heidelberg, 1999

11 Hans Geissel, Japanese-German Workshop Comparison with ISOLTRAP σ rms = 30 keV

12 Hans Geissel, Japanese-German Workshop Results compared with Theory  rms = 650 keV S. Goriely et al. PR C66 2002

13 Hans Geissel, Japanese-German Workshop Predictive Power of the Relativistic Mean Field Model (RMF)  rms = 3831 keV G.A. Lalazissis et al. ADNDT 71 (1999)1 even-even nuclei, NL3,  rms = 2.6 MeV Yu. Litvinov

14 Hans Geissel, Japanese-German Workshop Isospin Dependence of Pairing 2. Pairing-Gap energy, deduced from 5-point binding difference

15 Hans Geissel, Japanese-German Workshop New Mass Values compared with Theory Yu. Litvinov M. Matos Preliminary 238 U Fission Fragments 209 Bi Projectile Fragments

16 Hans Geissel, Japanese-German Workshop Lifetime Measurements of Short-lived Nuclei Applying Stochastic and Electronic Cooling 207m Tl 81+ 207 Tl 81+ 207 Pb 81+ Bound-state Beta-Decay of 207 Tl 81+ 207 Pb 81+ 207 Tl 81+ 207m Tl 81+

17 Hans Geissel, Japanese-German Workshop Combination of stochastic and electron cooling D. Boutin Stochastic Cooling Electron Cooling 202 Pb 81+ 202 Hg 79+ 207 Tl 81+

18 Hans Geissel, Japanese-German Workshop D. Boutin, F. Nolden Observation of the Short-Lived Isomer 207m Tl with Stochastic Cooling

19 Hans Geissel, Japanese-German Workshop Lifetime Measurements of 207m Tl  Shorter cooling time allowed to see isomeric state of 207 Tl (E * = 1348 keV, half-life of 1.33 ± 0.11 s for neutral atom)  Measured half-life of bare nuclei, transformed in the rest frame:

20 Hans Geissel, Japanese-German Workshop Schottky Spectrum of Continuous and Bound-State Beta Decay of 207 Tl 81+ = 1406 keV

21 Hans Geissel, Japanese-German Workshop Half-life Measurements of 207 Tl 81+ Bound-state Beta Decay D. Boutin

22 Nuclear Decay of Stored Single Atoms Time-resolved SMS is a powerful tool to study dynamical processes

23 Changes of half-lives of nuclear isomers in fully ionized atoms Half-life of the isomeric state of 149m Dy in neutral atom is 0.49(2) s laboratory frame Measured half-life in the fully ionized atom 149m Dy is 11(1) s Hindrance factor T 1/2 (fully ionized) T 1/2 (neutral) = 22(2) Yu. Litvinov et al. PL 2003

24 Mass Surface expected to be covered in the SMS experiment 2004 New K-Isomers in the 178 Lu region

25 RESR CR NESR ELISe Gas target EXL ILIMA Super-FRS Future

26 Russia PNPI Univ. St. Petersburg ILIMA Collaboration Yu. Novikov, NUSTAR Board meeting, 2.12.2004 10 countries 66 participants 18 institutions Poland SIns Warsaw France INP Orsav Belgium Inst. d’Astrophys. USA MSULANL UK Univ. Surray Univ. Manchester Japan Univ. Niigata Univ. Tsukuba Saitama univ. Greece Univ. Thessaloniki GermanyGSI JLU Giessen JGU Mainz TU München China IMP Lanzhou

27 Experiments with Stored Exotic Nuclei at Relativistic Energies

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