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Isomers in neutron-rich A ≈ 190 nuclides from 208Pb fragmentation

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Abstract.

Relativistic projectile fragmentation of 208Pb has been used to produce isomers in neutron-rich, A ≈ 190 nuclides. A forward-focusing spectrometer provided ion-by-ion mass and charge identification. The detection of γ-rays emitted by stopped ions has led to the assignment of isomers in 188Ta, 190W, 192Re, 193Re, 195Os, 197Ir, 198Ir, 200Pt, 201Pt, 202Pt and 203Au, with half-lives ranging from approximately 10 ns to 1 ms. Tentative isomer information has been found also for 174Er, 175Er, 185Hf, 191Re, 194Re and 199Ir. In most cases, time-correlated, singles γ-ray events provided the first spectroscopic data on excited states for each nuclide. In 200Pt and 201Pt, the assignments are supported by γ-γ coincidences. Isomeric ratios provide additional information, such as half-life and transition energy constraints in particular cases. The level structures of the platinum isotopes are discussed, and comparisons are made with isomer systematics.

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Authors and Affiliations

  1. Department of Physics, University of Surrey, GU2 7XH, Guildford, UK

    M. Caama no, P. M. Walker, P. H. Regan, Zs. Podolyák, J. Garcés Narro, W. Gelletly, C. J. Pearson, P. D. Stevenson, C. Wheldon, S. Wooding & F. Xu

  2. TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, Canada

    P. M. Walker

  3. Wright Nuclear Structure Laboratory, Yale University, CT 06520, New Haven, USA

    P. H. Regan

  4. Institute of Experimental Physics, Warsaw University, PL-00681, Warsaw, Poland

    M. Pfützner & M. Sawicka

  5. GSI, Planckstrasse 1, D-64291, Darmstadt, Germany

    J. Gerl, M. Hellström, P. Mayet, D. Cortina Gil, J. Döring, T. Enqvist, H. Geissel, M. Górska, H. Grawe, A. Kleinböhl, H. Schaffner, C. Schlegel, K. Schmidt, K. -H. Schmidt, F. Vivès, C. Wheldon, H. J. Wollersheim, S. Wooding & O. Yordanov

  6. Division of Nuclear Physics, Lund University, SE-22100, Sweden

    M. Hellström & M. N. Mineva

  7. IKS, KU Leuven, Celestijnenlaan 200 D, B-3000, Leuven, Belgium

    P. Mayet

  8. Department of Physics, University of Notre Dame, IN 46556, South Bend, USA

    A. Aprahamian

  9. Departamento de Fısica de Partıculas, University of Santiago de Compostela, 15706, Santiago de Compostela, Spain

    J. Benlliure

  10. School of Engineering, University of Brighton, BN2 4GJ, Brighton, UK

    A. M. Bruce

  11. Oliver Lodge Laboratory, University of Liverpool, L69 7ZE, Liverpool, UK

    P. A. Butler, D. M. Cullen, C. Fox, C. D. O’Leary & C. Wheldon

  12. Schuster Laboratory, University of Manchester, M13 9PL, Manchester, UK

    D. M. Cullen

  13. Department of Physics, University of Jyväskylä, 40351, Jyväskylä, Finland

    T. Enqvist

  14. TUNL, Duke University, NC 27708-0308, Durham, USA

    C. Fox

  15. CEN Bordeaux-Gradignan/CNRS, F-33175, Gradignan Cedex, France

    J. Giovinazzo

  16. Department of Physics and Astronomy, University of Tennessee, TN 37996-1200, Knoxville, USA

    R. Grzywacz

  17. CEA Saclay, DSM/DAPNIA/SPhN, F-91191, Gif-sur-Yvette Cedex, France

    W. Korten, R. Lucas & Ch. Theisen

  18. GANIL, BP 5027, F-14021, Caen Cedex, France

    M. Lewitowicz & F. De Oliveira

  19. Department of Radiation Sciences, Uppsala University, S-61182, Nyköping, Sweden

    H. Mach

  20. IPN, 91406, Orsay Cedex, France

    F. Rejmund & M. Rejmund

  21. CLRC Daresbury Laboratory, WA4 4AD, Warrington, UK

    D. D. Warner

  22. Department of Technical Physics, Peking University, 100871, Beijing, PRC

    F. Xu

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  1. M. Caama no
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  36. M. Sawicka
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  38. C. Schlegel
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  39. K. Schmidt
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  41. P. D. Stevenson
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  42. Ch. Theisen
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  43. F. Vivès
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  44. D. D. Warner
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  45. C. Wheldon
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  46. H. J. Wollersheim
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  47. S. Wooding
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  48. F. Xu
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  49. O. Yordanov
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Corresponding author

Correspondence to P. M. Walker.

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Caama no, M., Walker, P.M., Regan, P.H. et al. Isomers in neutron-rich A ≈ 190 nuclides from 208Pb fragmentation. Eur. Phys. J. A 23, 201–215 (2005). https://doi.org/10.1140/epja/i2004-10079-7

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  • DOI: https://doi.org/10.1140/epja/i2004-10079-7

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