Coexistence of Single-Particle, Collective-Quadrupole, and $α$ + ${}^{14}C$ Molecular-Dipole Degrees of Freedom in ${}^{18}O$

All natural-parity states of

{}^{18}O

have been studied with high accuracy with the

{}^{14}C ({}^{7}{Li}, t γ) {}^{18}O

coincidence and

{}^{14}C (α, γ) {}^{18}O

radiative-capture reactions. The four-particle, two-hole

0_{2}^{+}

1^{-}

2_{3}^{+}

, and

3_{3}^{-}

states deexcite with consecutive enhanced

E 1

and

E 2

cross-over transitions having

B (E 1) ≃ 10^{- 2}

Weisskopf units (W.u.) and

B (E 2) ≃ 20

W.u. These data suggest the existence of an

α

{}^{14}C

dipole band in

{}^{18}O

similar to those discussed recently by Iachello and Jackson.

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Coexistence of Single-Particle, Collective-Quadrupole, andα+C14Molecular-Dipole Degrees of Freedom inO18