From highly to superdeformed shapes : study of Gd-143

• A superdeformed band has been discovered in Gd-143 consisting Of 15 transitions. It does not show the band crossing observed in the neighbouring heavier Gd isotopes and it is degenerate with the superdeformed band in Eu-143. In contrast to other degenerate bands at superdeformed shape, the configurations of the bands are quite different here. They result from the exchange of a nu 6(4) with a pi[404]9/2 configuration. In addition, a collective band has been observed which adopts a well-deformed triaxial shape at high spins according to calculations. The transition from highly to superdeformed shapes proceeds via triaxial shapes.

Nyckelord

nuclear reactions Mo-97(V-51,p4n), E=238 MeV

measured E-gamma, I-gamma, gamma gamma gamma-proton coin, DCO ratios, gamma-polarization

Gd-143 deduced levels, J, pi, superdeformed bands, configurations

Compton-suppressed Ge-detector array, Si particle-telescope array

cranked shell model calculations

i13/2 intruder band

quadrupole-moment

nucleus gd-144

region

spectroscopy

excitations

eu-144

dipole

shell

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