First observation of a near-harmonic vibrational nucleus

Abstract
Evidence is presented for five closely spaced states in Cd118 near Eex2 MeV, which are interpreted as a near-harmonic three-phonon quintuplet. Candidates for even higher-lying multiphonon states are also found. The experimental spectrum is compared with an anharmonic vibrator [or U(5) spectrum] and an interacting-boson-approximation calculation incorporating a two-particle, four-hole intruder configuration.

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