Abstract.
High-spin states in the neutron-rich nuclei 172,173Yb have been populated in a 170Er(7Li,(p,d,t)xn) incomplete-fusion reaction and the emitted γ-radiation was detected with the GASP array. The signature partners of the 7/2+[633] rotational band of the odd-N 173Yb isotope have been newly established and were observed up to spin values of (45/2+) and (43/2+), respectively. The ground-state band of the even-even nucleus 172Yb has been observed up to a spin value of (22+). No band crossings were found in these bands. To explain this observation, it is proposed that the static pair field is absent, considering that the neutron odd-even mass differences reach for these nuclei very small values and that the band crossing is absent in cranked shell modell calculations without pairing. The results indicate, however, that strong dynamic correlations are still present.
Similar content being viewed by others
References
R.B. Firestone, V. Shirley (Editors), Table of Isotopes, eighth edition, Vol. II (John Wiley & Sons, Inc., 1996).
P.M. Walker, Nucl. Phys. A 343, 43 (1980).
I.Y. Lee, Phys. Rev. C 56, 753 (1997).
S.J. Asztalos, Phys. Rev. C 60, 044307 (1999).
G.D. Dracoulis, J. Phys. G 23, 1191 (1997).
S.M. Mullins, Phys. Rev. C 58, 831 (1998).
G.D. Dracoulis, Phys. Rev. C 58, 1444 (1998).
T.R. McGoram, Phys. Rev. C 62, 031303(R) (2000).
A. Jungclaus, Phys. Rev. C 66, 014312 (2002).
A. Jungclaus, Phys. Rev. C 67, 034302 (2003).
D. Bazzacco, in Proceedings of the International Conference on Nuclear Structure at High-Angular Momentum, Ottawa, 1992, Report no. AECL-10613, Vol. 2 (1992) p. 376.
E. Farnea, Nucl. Instrum. Methods A 400, 87 (1997).
W. Urban, Manchester University, Nuclear Physics Report (1991-1992) p. 95.
B. Singh, Nucl. Data Sheets 75, 199 (1995).
D.G. Burke, Nucl. Phys. A 656, 287 (1999).
C. Fahlander, Nucl. Phys. A 541, 157 (1992).
L.L. Riedinger, Phys. Rev. C 20, 2170 (1979).
M. Oshima, Phys. Rev. C 40, 2084 (1989).
R.W. Tarara, Phys. Rev. C 16, 2167 (1977).
S. Frauendorf, Nucl. Phys. A 409, 243c (1983).
J.C. Bacelar, Nucl. Phys. A 442, 509 (1985).
A. Fitzpatrick, Nucl. Phys. A 582, 335 (1995).
G. Audi, Nucl. Phys. A 729, 337 (2003).
W. Satuła, Phys. Rev. Lett. 81, 3599 (1998).
J. Oliviera, Phys. Rev. C 47, R926 (1993).
D. Archer, Phys. Rev. C 57, 2924 (1998).
R. Bengtsson, At. Data Nucl. Data Tables 35, 15 (1986).
S. Frauendorf, Phys. Scr. 24, 349 (1981).
Author information
Authors and Affiliations
Corresponding author
Additional information
D. Schwalm
Rights and permissions
About this article
Cite this article
Venkova, T., Gast, W., Lieder, R.M. et al. Suppression of band crossing in the neutron-rich nuclei 172, 173Yb due to the absence of a static pair field. Eur. Phys. J. A 26, 19–24 (2005). https://doi.org/10.1140/epja/i2005-10132-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1140/epja/i2005-10132-1