Advertisement

The European Physical Journal Special Topics

, Volume 150, Issue 1, pp 117–120 | Cite as

Shape coexistence in 74Kr and 76Kr

  • A. Görgen
  • E. Clément
  • W. Korten
  • E. Bouchez
  • A. Chatillon
  • A. Hürstel
  • Y. Le Coz
  • Ch. Theisen
  • J. N. Wilson
  • M. Zielinska
  • C. Andreoiu
  • F. Becker
  • P. Butler
  • J. M. Casandjian
  • W. N. Catford
  • T. Czosnyka
  • G. de France
  • J. Gerl
  • R.-D. Herzberg
  • J. Iwanicki
  • D. G. Jenkins
  • G. D. Jones
  • P. J. Napiorkowski
  • G. Sletten
  • C. Timis
Article

Abstract.

The coexistence of prolate and oblate shapes in the light krypton isotopes was investigated by Coulomb excitation of radioactive 74Kr and 76Kr beams at sub-barrier energies from the SPIRAL facility at GANIL. States up to the 8+ in the ground-state band and several non-yrast states were populated in both cases via multi-step Coulomb excitation. A large set of both transitional and diagonal matrix elements was extracted from the measured differential Coulomb excitation cross sections. A complementary lifetime measurement using the recoil-distance Doppler shift method gave important constraints for the determination of the matrix elements. The signs of the quadrupole moments of the yrast and excited bands represent direct evidence for the coexistence of prolate and oblate shapes in both isotopes under study. The results are compared to recent configuration mixing calculations based on the generator coordinate method and Skyrme Hartree-Fock-Bogolyiubov mean-field states.

PACS.

21.10.Ky Electromagnetic moments 21.10.Tg Lifetimes 25.70.De Coulomb excitation 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. W. Nazarewicz et al., Nucl. Phys. A 435, 397 (1985) Google Scholar
  2. P. Bonche et al., Nucl. Phys. A 443, 39 (1985) Google Scholar
  3. R. Bengtsson, Nuclear Structure of the Zirconium Region (Springer, 1988), p. 17 Google Scholar
  4. A. Petrovici et al., Nucl. Phys. A 665, 333 (2000) Google Scholar
  5. P. Sarriguren et al., Nucl. Phys. A 658, 13 (1999) Google Scholar
  6. M. Yamagami et al., Nucl. Phys. A 693, 579 (2001) Google Scholar
  7. M. Bender, P. Bonche, P.-H Heenen, Phys. Rev. C 74, 024312 (2006) Google Scholar
  8. E. Bouchez et al., Phys. Rev. Lett. 90, 082502 (2003) Google Scholar
  9. K. Alder, A. Winther, Electromagnetic Excitation, Theory of Coulomb Excitation with Heavy Ions (North-Holland, 1975) Google Scholar
  10. D. Cline, Ann. Rev. Nucl. Part. Sci. 36, 683 (1986) Google Scholar
  11. T. Czosnyka, D. Cline, C.Y. Wu, Bull. Amer. Phys. Soc. 28, 745 (1983) Google Scholar
  12. S.L. Tabor et al., Phys. Rev. C 41, 2658 (1990) Google Scholar
  13. J. Roth et al., J. Phys. G: Nucl. Phys. 10, L25 (1984) Google Scholar
  14. B. Wörmann et al., Nucl. Phys. A 431, 170 (1984) Google Scholar
  15. A. Görgen et al., Eur. Phys. J. A 26, 153 (2005) Google Scholar
  16. E. Clément et al. (in preparation) Google Scholar

Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Authors and Affiliations

  • A. Görgen
    • 1
  • E. Clément
    • 1
  • W. Korten
    • 1
  • E. Bouchez
    • 1
  • A. Chatillon
    • 1
    • 2
  • A. Hürstel
    • 1
  • Y. Le Coz
    • 1
  • Ch. Theisen
    • 1
  • J. N. Wilson
    • 1
  • M. Zielinska
    • 1
    • 3
  • C. Andreoiu
    • 4
  • F. Becker
    • 2
  • P. Butler
    • 4
  • J. M. Casandjian
    • 5
  • W. N. Catford
    • 6
  • T. Czosnyka
    • 3
  • G. de France
    • 5
  • J. Gerl
    • 2
  • R.-D. Herzberg
    • 4
  • J. Iwanicki
    • 3
    • 4
  • D. G. Jenkins
    • 4
  • G. D. Jones
    • 4
  • P. J. Napiorkowski
    • 3
  • G. Sletten
    • 7
  • C. Timis
    • 6
  1. 1.CEA SaclayGif-sur-YvetteFrance
  2. 2.Gesellschaft für SchwerionenforschungDarmstadtGermany
  3. 3.Heavy Ion Laboratory, Warsaw UniversityWarsawPoland
  4. 4.Oliver Lodge Laboratory, University of LiverpoolLiverpoolUK
  5. 5.GANIL, BP. 5027Caen CedexFrance
  6. 6.Department of PhysicsUniversity of SurreyGuildfordUK
  7. 7.Niels Bohr Institute, University of CopenhagenCopenhagen ØDenmark

Personalised recommendations