Advertisement

β-delayed proton decays and spin assignments for 133Sm and 149Yb

  • S. -W. Xu
  • Y. -X. Xie
  • Z. -K. Li
  • F. -R. Xu
  • H. -L. Liu
  • Y. -B. Xing
  • B. Guo
  • J. -P. Xing
  • C. -F. Wang
Nuclear Structure and Reactions

Abstract.

The proton-rich isotope 133Sm was produced via the fusion evaporation reaction 40Ca + 96Ru. Its β-delayed proton decay was studied by p-γ coincidence in combination with a He-jet tape transport system, and half-lives, proton energy spectra, γ-transitions following the proton emission, as well as β-delayed proton branching ratios to the low-lying states in the grand-daughter nucleus were determined. Comparing the observed β-delayed proton branching ratios with statistical model calculations, the best agreement is found assuming that only one level with the spin of 3/2 in 133Sm decays or two levels with the spins of 1/2 and 5/2 decay with similar half-lives. The configuration-constrained nuclear potential energy surfaces of 133Sm were calculated using the Woods-Saxon-Strutinsky method, which suggests a 1/2- ground state and a 5/2+ isomer with an excitation energy of 120keV. Therefore, the simple (EC+β+) decay scheme of 133Sm in Eur. Phys. J. A 11, 277 (2001) has been revised. In addition, our previous experimental data on the β-delayed proton decay of 149Yb reported in Eur. Phys. J. A 12, 1 (2001) was also analyzed using the same method. The spin-parity of 149Yb is suggested to be 1/2-.

PACS.

23.40.Hc Relation with nuclear matrix elements and nuclear structure 21.10.Hw Spin, parity, and isobaric spin 24.10.Pa Thermal and statistical models 27.60.+j 90 ⩽ A ⩽ 149 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    D.D. Bogdanov, A.V. Demyanov, V.A. Karnaukhov, Nucl. Phys. A 275, 229 (1977).CrossRefADSGoogle Scholar
  2. 2.
    P.A. Wilmarth, J.M. Nitschke, J.M. Lemmertz, Z. Phys. A 321, 179 (1985).CrossRefGoogle Scholar
  3. 3.
    J. Breitenbach, R. Braga, J.L. Wood, in 6th International Conference on Nuclei Far From Stability / 9th International Conference on Atomic Masses and Fundamental Constants, 1992, Inst. Phys. Conf. Series, No. 132, 575 (1993).Google Scholar
  4. 4.
    S.-W. Xu, Y.-X. Xie, X.-D. Wang, Eur. Phys. J. A 11, 277 (2001)CrossRefADSGoogle Scholar
  5. 5.
    P.H. Regan, Nucl. Phys. A 533, 476 (1991).CrossRefADSGoogle Scholar
  6. 6.
    A. Galindo-Uribarri, D. Ward, H.R. Andrews, Phys. Rev. C 54, 1057 (1996).CrossRefADSGoogle Scholar
  7. 7.
    S.-W. Xu, Z.-K. Li, Y.-X. Xie, Eur. Phys. J. A 12, 1 (2001).CrossRefADSGoogle Scholar
  8. 8.
    S.-W. Xu, Z.-K. Li, Y.-X. Xie, Phys. Rev. C 71, 054318 (2005).CrossRefADSGoogle Scholar
  9. 9.
    S.-W. Xu, Y.-X. Xie, Z.-K. Li, Phys. Rev. C 60, 061302(R) (1999).CrossRefADSGoogle Scholar
  10. 10.
    S.-W. Xu, Y.-X. Xie, Z.-K. Li, Z. Phys. A 356, 227 (1996).CrossRefGoogle Scholar
  11. 11.
    Yu Khazov, A.A. Rodinov, S. Sakharov, Nucl. Data Sheets 104, 497 (2005).CrossRefADSGoogle Scholar
  12. 12.
    P. Hornshoj, K. Wilsky, P.G. Hansen, Nucl. Phys. A 187, 609 (1972).CrossRefADSGoogle Scholar
  13. 13.
    J.C. Hardy, Phys. Lett. B 109, 242 (1982).CrossRefADSGoogle Scholar
  14. 14.
    W. Nazarewicz, J. Dudek, R. Bengtsson, Nucl. Phys. A 435, 397 (1985).CrossRefADSGoogle Scholar

Copyright information

© Società Italiana di Fisica and Springer-Verlag 2006

Authors and Affiliations

  • S. -W. Xu
    • 1
  • Y. -X. Xie
    • 1
  • Z. -K. Li
    • 1
  • F. -R. Xu
    • 2
  • H. -L. Liu
    • 2
  • Y. -B. Xing
    • 1
  • B. Guo
    • 1
  • J. -P. Xing
    • 1
  • C. -F. Wang
    • 1
  1. 1.Institute of Modern PhysicsChinese Academy of SciencesLanzhouPRC
  2. 2.Department of Technical PhysicsPeking UniversityBeijingPRC

Personalised recommendations