The nuclei (138)Nd and (139)Nd have been studied at very high spins via the (48)Ca+(94)Zr reaction. Several new rotational bands were observed, four in (138)Nd and two in (139)Nd. Th, J((2)) moments of inertia calculated from the observed gamma-ray energies are very small and almost constant, indicating that these bands are triaxial. Cranked Nilsson-Strutinsky calculations reproduce the general behavior of the bands, supporting this interpretation and suggesting an approximately constant gamma value of similar to +35 degrees over a large spin range up to the highest observed spins. These bands and a few similar bands in other nuclei of the N approximate to 80 region are a unique example of almost undisturbed triaxial bands.
Stable Triaxiality at the Highest Spins in 138Nd and 139Nd
LUNARDI, SANTO;
2000
Abstract
The nuclei (138)Nd and (139)Nd have been studied at very high spins via the (48)Ca+(94)Zr reaction. Several new rotational bands were observed, four in (138)Nd and two in (139)Nd. Th, J((2)) moments of inertia calculated from the observed gamma-ray energies are very small and almost constant, indicating that these bands are triaxial. Cranked Nilsson-Strutinsky calculations reproduce the general behavior of the bands, supporting this interpretation and suggesting an approximately constant gamma value of similar to +35 degrees over a large spin range up to the highest observed spins. These bands and a few similar bands in other nuclei of the N approximate to 80 region are a unique example of almost undisturbed triaxial bands.
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