Analysis of the negative-parity yrast band in 155Tb

WU Xing-Ju，

XU Jin-Zhang，

CHEN Xing-Qu

Nuclear Science and Techniques

Vol.11, No.1

pp.56-59

Published in print 01 Feb 2000

CLC：O571.21+1, O571.22, O571.24

22700

Using the particle-rotor model, the energy spectrum and the B(M1)/B(E2) ratio of the negative-parity yrast band in ¹⁵⁵Tb are investigated and compared with the experimental data before and after the band-crossing. It is noted that before and after the band-crossing the moment of inertia of the core is a smooth function of the total angular momentum I and can be described by the ab formula. The yrast band of ¹⁵⁵Tb with negative parity may be triaxially deformed (γ=-13°) before and an axially symmetric shape (γ=0°) after the band-crossing.

High spin nuclear statesThe ab formula

References

Holmberg P, Lipas P O.

Nucl Phys, 1968, A117: 552-560

Wu C S, Zeng J Y.

Commum Theor Phys, 1987, 8: 51-74

Xu F X, Wu C S, Zeng J Y.

Phys Rev, 1989, C40: 2337-2341

Liang Y S, Wu X J, Xu J Z et al. Phys Rev, 1999, C60: 054305

Wu C S, Zeng J Y, Xing Z et al. Phys Rev, 1992, C45: 261-274

Chen X Q, Xing Z.

J Phys, 1993, G19(11): 1869-1877

Xing Z, Wang Z X, Chen X Q.

Chin Phys Lett, 1998, 15: 170-172

Xing Z, Wang Z X, Chen X Q et al. High Energy Phys Nucl Phys (in Chinese), 1998, 22(6): 545-549

Hartley D J, Brown T B. Kondev F G et al. Phys Rev, 1998, C58(5): 2720-2735

Janzen V P, Liu Z M, Carpenter M P et al. Phys Rev, 1992, C45: 613-639

Hamamoto I, Mottelson B R.

Phys Lett, 1986, B167(4): 370-374

Hamamoto I, Sagawa H.

Phys Lett, 1988, B201(4): 415-419