Electromagnetic properties of the negative-parity yrast bands of the N=75 isotones ranging from barium to gadolinium (56<or=Z<or=64) are summarized. Experimental E2/M1 multipole mixing ratios for inband Delta I=1 transitions have been extracted up through the first band crossing, allowing the evaluation of B(M1; I to I-1)/B(E2; I to I-1), B(M1; I to I-1)/B(E2; I to I-2) and B(E2; I to I-1)/B(E2; I to I-2) ratios of reduced transition probabilities for both the nu h11/2 and nu h11/2(X)( pi h11/2)2 configurations. The results obtained at low spin provide evidence for triaxial nuclear shapes, while at high spin the data are consistent with axially symmetric shapes.
|Original language||English (US)|
|Number of pages||13|
|Journal||Journal of Physics G: Nuclear and Particle Physics|
|State||Published - Dec 1 1991|
ASJC Scopus subject areas
- Nuclear and High Energy Physics