Skip to main content
SpringerLink
Log in

First observation of excited states in the 111Tc nucleus --A new region of deformation at 40 ⩽ Z ⩽ 46, N ≥ 68?

  • Original Article
  • Published:
The European Physical Journal A - Hadrons and Nuclei Aims and scope Submit manuscript

Abstract.

The 111Tc nucleus, populated in the spontaneous fission of 248Cm, was studied by means of prompt γ-ray spectroscopy using the EUROGAM2 array. Excited states in 111Tc were observed for the first time. Systematics of energy levels in odd-A Tc isotopes, obtained in our study of 107Tc and 109Tc provide a reliable spin and parity assignment I = 5/2+ to the head of the new band in 111Tc, interpreted as the π5/2+[422] orbital originating from the proton g9/2 shell. This level is most likely the ground state. Therefore, the (9/2+,7/2+) spin-parity assignment to the ground state of 111Tc, reported previously, is unlikely. Properties of the yrast band in 111Tc suggest prolate deformation of this band. There are hints that the deformation of 111Tc is larger than that of 109Tc, possibly due to admixtures of oblate-deformed configurations, which lower their excitation energy with increasing neutron number.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. W. Urban, Eur. Phys. J. A 20, 381 (2004).

    Google Scholar 

  2. M.C.A. Hotchkis, Nucl. Phys. A 530, 111 (1991).

    Google Scholar 

  3. M. Houry, Eur. Phys. J. A 6, 43 (1999).

    Google Scholar 

  4. X.Q. Zhang, Phys. Rev. C 61, 014305 (1999).

    Google Scholar 

  5. P. Moller, At. Data Nucl. Data Tables 59, 185 (1995).

    Google Scholar 

  6. F.R. Xu , Phys. Rev. C 65, 021303(R) (2002).

    Google Scholar 

  7. F.-K. Thieleman, K.-L. Kratz, Proceedings of the XXII Masurian Lakes Summer School, Poland, 1991 (IOP Publishing) pp. 187-226.

  8. G. Audi, A.H.Wapstra, C. Thibault, Nucl. Phys. A 729, 337 (2003).

    Google Scholar 

  9. H. Ohm, JUL-Spez-304 (1986) p. 30.

  10. J.W. Borgs, Nucl. Instrum. Methods B 26, 304 (1987).

    Google Scholar 

  11. J.K. Hwang, Phys. Rev. C 57, 2250 (1998).

    Google Scholar 

  12. Evaluated Nuclear Structure Data File (2004), www.nndc. bnl.gov.

  13. W. Urban, Phys. Rev. C 70, 057308 (2004).

    Google Scholar 

  14. W. Urban, in preparation.

  15. W. Urban, Z. Phys A 358, 145 (1997).

    Google Scholar 

  16. W. Urban, Eur. Phys. J. A 5, 239 (1999).

    Google Scholar 

  17. P. Bhattacharyya, Phys. Rev. C 56, R2363 (1997).

  18. C.T. Zhang, Phys. Rev. Lett. 77, 3743 (1996).

    Google Scholar 

  19. A. Bauchet , Eur. Phys. J. A 10, 145 (2001).

    Google Scholar 

  20. Ts. Venkova, Eur. Phys. J. A 15, 429 (2002).

    Google Scholar 

  21. Y.X. Luo, Phys. Rev. C 70, 04310 (2004).

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Faculty of Physics, Warsaw University, ul. Hoża 69, 00-681, Warsaw, Poland

    W. Urban & T. Rzaca-Urban

  2. Department of Physics and Astronomy, University of Manchester, M13 9PL, Manchester, UK

    J. L. Durell & A. G. Smith

  3. Argonne National Laboratory, 60439, Argonne, IL, USA

    I. Ahmad

Authors
  1. W. Urban
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. T. Rzaca-Urban
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. J. L. Durell
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. A. G. Smith
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. I. Ahmad
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to W. Urban.

Additional information

D. Schwalm

Rights and permissions

Reprints and permissions

About this article

Cite this article

Urban, W., Rzaca-Urban, T., Durell, J.L. et al. First observation of excited states in the 111Tc nucleus --A new region of deformation at 40 ⩽ Z ⩽ 46, N ≥ 68?. Eur. Phys. J. A 24, 161–165 (2005). https://doi.org/10.1140/epja/i2004-10140-7

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1140/epja/i2004-10140-7

PACS.

Search

Navigation