Splitting of the giant dipole resonance built on excited states of Er nuclei, observed in continuum γ-ray spectra from ¹²C + ¹⁴⁸Sm and ¹²C + ¹⁵⁴Sm reactions, reveals the persistence of prolate, ground-state-like deformation at elevated temperature T~1 MeV and spins I=0 to 25.
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Gossett et al. (1985) studied this question.
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