Characterization of the proposed 4-α cluster state candidate in 16O

Abstract

The ${}^{16}\mathrm{O}(\alpha ,{\alpha }^{\prime })$ reaction was studied at ${\theta }_{lab}=0^{\circ }$ at an incident energy of ${\text{E}}_{lab}$ = 200 MeV using the K600 magnetic spectrometer at iThemba LABS. Proton and $\alpha$-decay from the natural parity states were observed in a large-acceptance silicon-strip detector array at backward angles. The coincident charged particle measurements were used to characterize the decay channels of the $0_6^{+}$ state in ${}^{16}\mathrm{O}$ located at $E_x=15.097(5)$ MeV. This state is identified by several theoretical cluster calculations to be a good candidate for the 4-$\alpha$ cluster state. The results of this work suggest the presence of a previously unidentified resonance at $E_x\approx 15$ MeV that does not exhibit a $0^{+}$ character. This unresolved resonance may have contaminated previous observations of the $0_6^{+}$ state.

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• Concepts of alpha-particle condensation
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• Microscopic study of 4-alpha-particle condensation with proper treatment of resonances
• $\alpha$-particle condensate states in ${}^{16}$O
• Alpha Cluster Structure and Exotic States in a Self-Consistent Model for Light Nuclei
• CAKE: The Coincidence Array for K600 Experiments

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