## Abstract

Electromagnetic properties of the negative-parity yrast bands of the N = 75 isotones ranging from barium to gadolinium (56 less-than-or-equal-to Z less-than-or-equal-to 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 --> I - 1)/B(E2; I --> I - 1), B(M1; I --> I - 1)/B(E2; I --> I - 2) and B(E2; I --> I - 1)/B(E2; I --> 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 higher spin the data are consistent with axially symmetric shapes.

Original language | English |
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Pages (from-to) | 605-617 |

Number of pages | 13 |

Journal | Journal of physics g-Nuclear and particle physics |

Volume | 17 |

Issue number | 5 |

Publication status | Published - May 1991 |

## Keywords

- NUCLEI
- QUASIPARTICLE
- SIGNATURE
- INTRUDER
- RATES
- SHAPE
- BANDS
- M1