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Structure of neutron-rich nuclei around the N = 126 closed shell; the yrast structure of 205Au126 up to spin-parity \(I^{\pi}\) = (19/2+)

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Abstract

Heavy neutron-rich nuclei have been populated through the relativistic fragmentation of a \(\ensuremath ^{208}_{\ 82}{\rm Pb}\) beam at \(\ensuremath E/A = 1\) GeV on a \(\ensuremath 2.5 {\rm g/cm^2}\) thick Be target. The synthesised nuclei were selected and identified in-flight using the fragment separator at GSI. Approximately 300 ns after production, the selected nuclei were implanted in an \(\ensuremath \sim 8\) mm thick perspex stopper, positioned at the centre of the RISING \(\ensuremath \gamma\) -ray detector spectrometer array. A previously unreported isomer with a half-life \(\ensuremath T_{1/2} = 163(5)\) ns has been observed in the N = 126 closed-shell nucleus \(\ensuremath ^{205}_{\ 79}{\rm Au}\) . Through \( \gamma\) -ray singles and \( \gamma\) -\( \gamma\) coincidence analysis a level scheme was established. The comparison with a shell model calculation tentatively identifies the spin-parity of the excited states, including the isomer itself, which is found to be \(\ensuremath I^{\pi} = (19/2^+)\) .

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References

  1. B. Fornal et al., Phys. Rev. Lett. 87, 212501 (2001).

    Article  ADS  Google Scholar 

  2. R. Grzywacz et al., Phys. Lett. B 355, 439 (1995).

    Article  ADS  Google Scholar 

  3. M. Pfützner et al., Phys. Lett. B 444, 32 (1998).

    Article  ADS  Google Scholar 

  4. M. Caamano et al., Eur. Phys. J. A 23, 201 (2005).

    Article  ADS  Google Scholar 

  5. Zs. Podolyák et al., Phys. Lett. B 491, 225 (2000).

    Article  ADS  Google Scholar 

  6. H. Grawe, K. Langanke, G. Martinez-Pinedo, Rep. Prog. Phys. 70, 1525 (2007).

    Article  ADS  Google Scholar 

  7. S.J. Steer et al., to be published in Int. J. Mod. Phys. E.

  8. S.J. Steer et al., in preparation.

  9. S.J. Steer, PhD Thesis, University of Surrey, 2008, unpublished.

  10. S.J. Steer et al., Phys. Rev. C 78, 061302(R) (2008).

    Article  MathSciNet  ADS  Google Scholar 

  11. H. Geissel et al., Nucl. Instrum. Methods B 70, 286 (1992).

    Article  ADS  Google Scholar 

  12. S. Pietri et al., Nucl. Instrum. Methods B 261, 1079 (2007).

    Article  ADS  Google Scholar 

  13. P.H. Regan et al., Nucl. Phys. A 787, 491c (2007).

    Article  ADS  Google Scholar 

  14. Zs. Podolyák et al., Eur. Phys. J. ST 150, 165 (2007).

    Google Scholar 

  15. M. Pfützner et al., Phys. Rev. C 65, 064604 (2002).

    Article  ADS  Google Scholar 

  16. B.A. Brown, A. Etchegoyen, W.D.M. Rae, The computer code OXBASH, MSU-NSCL report no. 524.

  17. D. Eccleshall, M.J.L. Yates, Phys. Lett. 19, 301 (1965); M.J. Martin, Nucl. Data Sheets 70, 315 (1993).

    Article  ADS  Google Scholar 

  18. L. Rydström et al., Nucl. Phys. A 512, 217 (1990).

    ADS  Google Scholar 

  19. T.T.S. Kuo, G.H. Herling, Naval Research Laboratory Report 2259 (Washington, DC, 1971).

  20. G.H. Herling, T.T.S. Kuo, Nucl. Phys. A 181, 113 (1972).

    Article  ADS  Google Scholar 

  21. Zs. Podolyák et al., Phys. Lett. B 672, 116 (2009).

    Article  ADS  Google Scholar 

  22. R. Kumar et al., Nucl. Instrum. Methods A 598, 754 (2009).

    Article  ADS  Google Scholar 

  23. N. Alkhomashi et al., Acta Phys. Pol. B 40, 875 (2009).

    ADS  Google Scholar 

  24. P.H. Regan et al., Int. J. Mod. Phys. E Suppl. 17, 8 (2008).

    Article  ADS  Google Scholar 

  25. A.I. Morales et al., Acta Phys. Pol. B 40, 867 (2009).

    ADS  Google Scholar 

  26. N. Al-Dahan et al., Acta Phys. Pol. B 40, 871 (2009).

    ADS  Google Scholar 

Download references

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Correspondence to Zs. Podolyák.

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Communicated by J. Äystö

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Podolyák, Z., Steer, S.J., Pietri, S. et al. Structure of neutron-rich nuclei around the N = 126 closed shell; the yrast structure of 205Au126 up to spin-parity \(I^{\pi}\) = (19/2+). Eur. Phys. J. A 42, 489–493 (2009). https://doi.org/10.1140/epja/i2009-10794-5

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  • DOI: https://doi.org/10.1140/epja/i2009-10794-5

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