- Physical Review Journals
All JournalsPhysics Magazine
Access Provided by Xinjiang University

Physical Review C

Export citation

Export citation

Choose format for download:

Download Citation
  • Access by Xinjiang University

Gamow-Teller transitions and magnetic properties of nuclei and shell evolution

Toshio Suzuki*

Rintaro Fujimoto

Takaharu Otsuka

  • Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40, Setagaya-ku, Tokyo 156, Japan

  • Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

  • Department of Physics and Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • RIKEN, Hirosawa, Wako-shi, Saitama 351-0198, Japan

  • *Email address: suzuki@chs.nihon-u.ac.jp
PDF

Phys. Rev. C 67, 044302 – Published 18 April, 2003

DOI: https://doi.org/10.1103/PhysRevC.67.044302

Abstract

New aspects of quenching of Gamow-Teller (GT) transitions and magnetic moments are investigated for p-shell nuclei using an improved shell-model Hamiltonian with enhanced spin-flip proton-neutron interaction and modified single-particle energies. The present shell-model Hamiltonian thus obtained is used in the configuration space up to (2–3)ħω excitations, and GT transitions and magnetic moments are calculated with bare g factors and bare axial-vector coupling constant. Manifestation of variable quenching due to changing gap between 0p3/2 and 0p1/2 is presented in GT transitions such as 12C→12N, 11B→11Be, and 9Li→9Be. A similar effect is shown for magnetic moments. Better agreement with experimental values is obtained systematically by using the present Hamiltonian for GT transitions and magnetic moments in most of p-shell nuclei, as well as for energy levels. Thus, the shell structure is changing from nucleus to nucleus in an orderly way (i.e., shell evolution), the inclusion of which leads us to an improved description of the GT and magnetic properties. It is stressed that the anomalous shell structure of exotic nuclei and the GT/magnetic properties of stable and exotic nuclei are linked through the same underlying mechanism.

View figure in article

References (52)

  1. M.G. Mayer, Phys. Rev. 75, 1969 (1949); ibid.O. Haxel, J.H.D. Jensen, and H.E. Suess, 75, 1766 (1949).
  2. T. Otsuka, R. Fujimoto, Y. Utsuno, B.A. Brown, M. Honma, and T. Mizusaki, Phys. Rev. Lett. 87, 082502 (2001).
  3. T. Otsuka, Prog. Theor. Phys. Suppl. 146, 6 (2002).
  4. M. Hjorth-Jensen, T.T.S. Kuo, and E. Osnes, Phys. Rep. 261, 125 (1995); M. Hjorth-Jensen (private communication).
  5. A. Arima, K. Shimizu, W. Bentz, and H. Hyuga, Adv. Nucl. Phys. 18, 1 (1986); A. Arima and H. Hyuga, in Mesons in Nuclei, edited by D.H. Wilkinson and M. Rho (North-Holland, Amsterdam, 1979), Vol. II, p. 683.
  6. I.S. Towner, Phys. Rep. 155, 263 (1987); I.S. Towner and F.C. Khanna, Nucl. Phys. A399, 334 (1983).
  7. S. Cohen and D. Kurath, Nucl. Phys. 73, 1 (1965).
  8. B.A. Brown and B.H. Wildenthal, Annu. Rev. Nucl. Part. Sci. 38, 29 (1988).
  9. P. Raghavan, At. Data Nucl. Data Tables 42, 189 (1989).
  10. R.E. McDonald, J.A. Becker, R.A. Chalmers, and D.H. Wilkinson, Phys. Rev. C 10, 333 (1974).
  11. T. Ohnishi et al., Nucl. Phys. A687, 38c (2001).
  12. E. Roeckl, D.F. Dittner, C. Detraz, R. Klapisch, C. Thibault, and C. Rigaud, Phys. Rev. C 10, 1181 (1974).
  13. N. Aoi et al., Nucl. Phys. A616, 181c (1997).
  14. M.J.G. Borge et al., Phys. Rev. C 55, R8 (1997).
  15. N. Kumar, Nucl. Phys. A225, 221 (1974).
  16. L. Coraggio, A. Covello, A. Gargano, N. Itaco, and T.T.S. Kuo, J. Phys. G 27, 2351 (2001).
  17. T. Suzuki and T. Otsuka, Phys. Rev. C 50, R555 (1994).
  18. T. Suzuki and T. Otsuka, Phys. Rev. C 56, 847 (1997).
  19. T. Suzuki and T. Otsuka, Nucl. Phys. A635, 86 (1998).
  20. D.J. Millener and D. Kurath, Nucl. Phys. A255, 315 (1975).
  21. T.T.S. Kuo, Nucl. Phys. A103, 71 (1967).
  22. OXBASH, the Oxford, Buenos-Aires, Michigan State, Shell Model Program, B.A. Brown, A. Etchegoyan, and W.D.M. Rae, MSU Cyclotron Laboratory Report No. 524, 1986.
  23. T. Sebe et al. (unpublished).
  24. J.C. Hardy, I.S. Towner, V.T. Koslowsky, E. Hagberg, and H. Schmeing, Nucl. Phys. A509, 429 (1990).
  25. P. Bopp, D. Dubbers, L. Hornig, E. Klemt, J. Last, H. Schütze, S.J. Freedman, and O. Schärpf, Phys. Rev. Lett. 56, 919 (1986); D. Dubbers, Nucl. Phys. A527, 239c (1991).
  26. E.K. Warburton and B.A. Brown, Phys. Rev. C 46, 923 (1992).
  27. A.C. Hayes, Phys. Rep. 315, 257 (1999); D.J. Millener, Nucl. Phys. A693, 394 (2001).
  28. K. Yoro, Nucl. Phys. A333, 67 (1980).
  29. T. Suzuki, H. Hyuga, A. Arima, and K. Yazaki, Phys. Lett. 106B, 19 (1981).
  30. V.V. Balashov and R.A. Eramzhyan, At. Energy Rev. 5, 3 (1967); M. Morita and A. Fujii, Phys. Rev. 118, 606 (1960).
  31. T. Suzuki, in Proceedings of the International Symposium on Non-Nucleonic Degrees of Freedom Detected in Nuclei, Osaka, 1996, edited by T. Minamisono et al. (World Scientific, Singapore, 1997), p. 349.
  32. J.P. Deutsch et al., Phys. Lett. 28B, 178 (1968).
  33. R. Prieels, in Proceedings of the 14th International Conference on Particles and Nuclei (PANIC ’96), edited by C.E. Carlson and J.J. Domingo (World Scientific, Singapore, 1997), p. 568.
  34. G. Nyman et al., Nucl. Phys. A510, 189 (1990).
  35. F. Ajzenberg-Selove, Nucl. Phys. A523, 1 (1991); ibid.A490, 1 (1988); ibid.A449, 1 (1986); ibid.A336, 1 (1980).
  36. Table of Isotopes, edited by R.B. Firestone et al. (Wiley, New York, 1996).
  37. W.-T. Chou, E.K. Warburton, and B.A. Brown, Phys. Rev. C 47, 163 (1993).
  38. U.C. Bergmann et al., Nucl. Phys. A658, 129 (1999).
  39. H. Okuno et al., Phys. Lett. B 354, 41 (1995).
  40. J.G.L. Booten, A.G.M. van Hees, P.W. Glaudemans, and R. Wervelman, Phys. Rev. C 43, 335 (1991).
  41. K. Matsuta et al., Nucl. Phys. A588, 153c (1995).
  42. W. Geithner et al., Phys. Rev. Lett. 83, 3792 (1999).
  43. D.L. Auton, Nucl. Phys. A157, 305 (1970); ibid.B. Zweiglinski, W. Benenson, and R.G.H. Robertson, A315, 124 (1979).
  44. S. Fortier et al., Phys. Lett. B 461, 22 (1999).
  45. T. Kobayashi, in Proceedings of the International Symposium on Structure and Reactions of Unstable Nuclei, edited by K. Ikeda and Y. Suzuki (World Scientific, Singapore, 1991), p. 187; B.M. Young et al., Phys. Rev. Lett. 71, 4124 (1993).
  46. P. Egelhof, Prog. Part. Nucl. Phys. 46, 307 (2001).
  47. D.H. Gloeckner and R.D. Lawson, Phys. Lett. 53B, 313 (1974).
  48. S. Shimoura et al. (private communication).
  49. M. Fujimura et al., Ph.D. thesis, Osaka University, Osaka, 2002; (private communication).
  50. A. Poves and A. Zuker, Phys. Rep. 70, 235 (1981).
  51. T. Mizusaki, RIKEN Accel. Prog. Rep. 33, 14 (2000).
  52. Values in Fig. 5 are those with the renormalization effects while the shaded histogram in Fig. 4 is obtained without them.

Outline

Information

Phys. Rev. C 67, 044302– Published 18 April, 2003
  • Received 13 September 2002

© 2003 American Physical Society

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation