Yrare low-spin positive-parity states in N = 88 66 154 Dy

  • G. L. Zimba
  • S. P. Bvumbi
  • L. P. Masiteng
  • P. Jones
  • J. F. Sharpey-Schafer
  • S. N. T. Majola
  • T. S. Dinoko
  • O. Shirinda
  • J. J. Lawrie
  • J. E. Easton
  • N. A. Khumalo
  • L. Msebi
  • P. I. Mashita
  • P. Papka
  • D. G. Roux
  • D. Negi
Regular Article - Experimental Physics
  • 14 Downloads

Abstract.

Low-spin positive-parity yrare states of 66 154 Dy88 were established using the 155Gd(3He,4n) reaction at a beam energy of \(E_{lab} = 37.5\) MeV. The AFRODITE spectrometer array at iThemba LABS was used to record \(\gamma\gamma\) coincidences and measure DCO ratios and polarisation asymmetries. The \(K^{\pi}=2^{+}\) \( \gamma\) band has been observed up to spin \(13^{+}\) in the odd spins and to \( 12^{+}\) in the even spins. The staggering parameter S(I) of the \( \gamma\) band is compared to that found in other N = 88 isotones. Different behaviour of S(I) with increasing spin is observed for each of the isotones. We conjecture that the variation in S(I) is mainly due to mixing of the even-spin states with the same spin and parity states in neighbouring rotational bands. A second \( K^{\pi}=2^{+}\) band has been established up to a spin of \( 12^{+}\) in the even spins. We suggest that this is a \( \gamma\) band based on the \( J^{\pi} = 0^{+}\) state at \( E_{x} = 660.6\) keV.

References

  1. 1.
    H. Morinaga, Nucl. Phys. 75, 385 (1966)CrossRefGoogle Scholar
  2. 2.
    C. Girit, W.D. Hamilton, C.A. Kalfas, J. Phys. G 9, 7 (1983)CrossRefGoogle Scholar
  3. 3.
    A. Passoja et al., J. Phys. G 12, 1047 (1986)ADSCrossRefGoogle Scholar
  4. 4.
    H.W. Cranmer-Gordon et al., Nucl. Phys. A 465, 506 (1987)ADSCrossRefGoogle Scholar
  5. 5.
    E.S. Paul et al., Phys. Rev. C 79, 044324 (2009)ADSCrossRefGoogle Scholar
  6. 6.
    X. Wang, Phys. Lett. B 702, 127 (2011)ADSCrossRefGoogle Scholar
  7. 7.
    J.M. Rees et al., Phys. Rev. C 83, 044314 (2011)ADSCrossRefGoogle Scholar
  8. 8.
    N.V. Zamfir, R.F. Casten, Phys. Lett. B 260, 265 (1991)ADSCrossRefGoogle Scholar
  9. 9.
    W.C. Ma et al., Phys. Rev. C 65, 034312 (2002)ADSCrossRefGoogle Scholar
  10. 10.
    D.R. Zolnowski et al., Phys. Rev. C 21, 2556 (1980)ADSCrossRefGoogle Scholar
  11. 11.
    A. Bohr, B.R. Mottelson, Nuclear Structure, Vol. III (World Scientific, 1975)Google Scholar
  12. 12.
    A. Bohr, Phys. Rev. 81, 331 (1951)ADSCrossRefGoogle Scholar
  13. 13.
    A. Bohr, Phys. Rev. 81, 134 (1951)ADSCrossRefGoogle Scholar
  14. 14.
    A. Faessler, W.Z. Greiner, Z. Phys. 168, 425 (1962)ADSCrossRefGoogle Scholar
  15. 15.
    A. Faessler, W.Z. Greiner, Z. Phys. 170, 105 (1962)ADSCrossRefGoogle Scholar
  16. 16.
    A. Faessler, W.Z. Greiner, Z. Phys. 177, 190 (1964)ADSCrossRefGoogle Scholar
  17. 17.
    P.E. Garrett, J. Phys. G 27, R1 (2001)ADSCrossRefGoogle Scholar
  18. 18.
    J.F. Sharpey-Schafer et al., Eur. Phys. J. A 47, 5 (2011)ADSCrossRefGoogle Scholar
  19. 19.
    J.F. Sharpey-Schafer et al., Eur. Phys. J. A 47, 6 (2011)ADSCrossRefGoogle Scholar
  20. 20.
    W.D. Kulp et al., Phys. Rev. C 77, 061301(R) (2008)ADSCrossRefGoogle Scholar
  21. 21.
    I. Ragnarsson, R.A. Broglia, Nucl. Phys. A 263, 315 (1975)ADSCrossRefGoogle Scholar
  22. 22.
    P.E. Garrett et al., Phys. Rev. Lett. 103, 062501 (2009)ADSCrossRefGoogle Scholar
  23. 23.
    W.C. Ma et al., Phys. Rev. Lett. 61, 46 (1988)ADSCrossRefGoogle Scholar
  24. 24.
    Q.A. Ijaz et al., Phys. Rev. C 80, 034322 (2009)ADSCrossRefGoogle Scholar
  25. 25.
    J.F. Sharpey-Schafer, Nucl. Phys. News Int. 14, 5 (2004)CrossRefGoogle Scholar
  26. 26.
    D.C. Radford, Nucl. Instrum. Methods Phys. Res. A 306, 297 (1995)ADSCrossRefGoogle Scholar
  27. 27.
    K.S. Krane, R.M. Steffen, R.M. Wheeler, Nucl. Data Tables 11, 351 (1973)ADSCrossRefGoogle Scholar
  28. 28.
    J.H. Lee et al., J. Korean Phys. Soc. 40, 5 (2002)Google Scholar
  29. 29.
    P.M. Jones et al., Nucl. Instrum. Methods 362, 2 (1995)CrossRefGoogle Scholar
  30. 30.
    G.L. Zimba, MSc Thesis, Univ. of Johannesburg (2015)Google Scholar
  31. 31.
    G.L. Zimba et al., Phys. Rev. C 94, 054303 (2016)ADSCrossRefGoogle Scholar
  32. 32.
    C.W. Reich, Nucl. Data. Tables 110, 2257 (2009)ADSGoogle Scholar
  33. 33.
    L. Msebi, MSc Thesis, Univ. of Johannesburg (2016)Google Scholar
  34. 34.
    S.P. Bvumbi, MSc Thesis, Univ. of the Western Cape (2008)Google Scholar
  35. 35.
    P.I. Mashita, MSc Thesis, Univ. of the Western Cape (2013)Google Scholar
  36. 36.
    L. Wilets, M. Jean, Phys. Rev. 102, 788 (1956)ADSCrossRefGoogle Scholar
  37. 37.
    A.S. Davydov, G.F. Filipov, Nucl. Phys. 8, 237 (1958)CrossRefGoogle Scholar
  38. 38.
    A.S. Davydov, At. Energy Rev. 6, 3 (1968)Google Scholar
  39. 39.
    Z.P. Li, private communicationGoogle Scholar
  40. 40.
    Z. Shi, B.Y. Song, Z.P. Li, S.Q. Zhang, private communicationGoogle Scholar
  41. 41.
    S. Frauendorf, F.R. May, Phys. Lett. B 125, 245 (1983)ADSCrossRefGoogle Scholar
  42. 42.
    Yang Sun et al., Phys. Rev. C 61, 064323 (2000)ADSCrossRefGoogle Scholar
  43. 43.
    J.A. Sheikh, G.H. Bhat, Y. Sun, G.B. Vakil, R. Palit, Phys. Rev. C 77, 034313 (2008)ADSCrossRefGoogle Scholar
  44. 44.
    J.A. Sheikh, G.H. Bhat, R. Palit, Z. Naik, Y. Sun, Nucl. Phys. A 824, 58 (2009)ADSCrossRefGoogle Scholar
  45. 45.
    T. Nii, Z.P. Li, D. Vretenar, L. Prachniak, J. Meng, P. Ring, Phys. Rev. C 79, 034303 (2009)ADSCrossRefGoogle Scholar
  46. 46.
    Z.P. Li, T. Nii, D. Vretenar, J. Meng, G.A. Lalazissis, P. Ring, Phys. Rev. C 79, 054301 (2009)ADSCrossRefGoogle Scholar
  47. 47.
    S.N.T. Majola et al., Phys. Rev. C 91, 034330 (2015)ADSCrossRefGoogle Scholar
  48. 48.
    W.-T. Chou, Gh. Cata-Danil, N.V. Zamfir, R.F. Casten, N. Pietralla, Phys. Rev. C 64, 057301 (2001)ADSCrossRefGoogle Scholar
  49. 49.
    W.D. Kulp et al., Phys. Rev. C 76, 034319 (2000) and private communicationADSCrossRefGoogle Scholar
  50. 50.
    S.P. Bvumbi, PhD Thesis, University of Johannesburg (2013)Google Scholar
  51. 51.
    R.L. Andrews, R.D. Graham, H. Ward, J.S. Geiger, Nucl. Phys. A 219, 141 (1974)ADSCrossRefGoogle Scholar
  52. 52.
    R. Bengtsson, S. Frauendorf, Nucl. Phys. A 327, 139 (1979)ADSCrossRefGoogle Scholar
  53. 53.
    S.M. Harris, Phys. Rev. 138, B509 (1965)ADSCrossRefGoogle Scholar
  54. 54.
    L.L. Riedinger et al., Phys. Rev. Lett. 44, 568 (1980)ADSCrossRefGoogle Scholar

Copyright information

© SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • G. L. Zimba
    • 1
  • S. P. Bvumbi
    • 1
  • L. P. Masiteng
    • 1
  • P. Jones
    • 2
  • J. F. Sharpey-Schafer
    • 3
  • S. N. T. Majola
    • 2
    • 4
  • T. S. Dinoko
    • 2
  • O. Shirinda
    • 2
    • 5
  • J. J. Lawrie
    • 2
  • J. E. Easton
    • 3
  • N. A. Khumalo
    • 3
  • L. Msebi
    • 2
  • P. I. Mashita
    • 3
  • P. Papka
    • 5
  • D. G. Roux
    • 6
  • D. Negi
    • 2
    • 7
  1. 1.University of Johannesburg, Physics DepartmentAuckland ParkSouth Africa
  2. 2.iThemba LABS, National Research FoundationSomerset WestSouth Africa
  3. 3.University of Western Cape, Physics DepartmentBellvilleSouth Africa
  4. 4.University of Zululand, Physics DepartmentKwaDlangezwaSouth Africa
  5. 5.Stellenbosch University, Physics DepartmentMatielandSouth Africa
  6. 6.Rhodes University, Physics DepartmentGrahamstownSouth Africa
  7. 7.UM-DAE Centre for Excellence in Basic SciencesMumbaiIndia

Personalised recommendations