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

Li, K. C. W. ; Neveling, R. ; Adsley, P. ; Papka, P. ; Smit, F. D. ; Brummer, J. W. ; Diget, C. Aa. ; Freer, M. ; Harakeh, M. N. ; Kokalova, Tz. ; Nemulodi, F. ; Pellegri, L. ; Rebeiro, B. ; Swartz, J. A. ; Triambak, S. ; Van Zyl, J. J. ; Wheldon, C. (2017)

CITATION: Li, K. C. W., et al. 2017. Characterization of the proposed 4−α cluster state candidate in ¹⁶O. Physical Review C, 95(3):1-6, doi:10.1103/PhysRevC.95.031302.

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The 0¹⁶O(α,α′) reaction was studied at θlab=0∘ at an incident energy of Elab=200 MeV using the K600 magnetic spectrometer at iThemba LABS. Proton decay and α 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 ¹⁶O located at Ex=15.097(5) MeV. This state is identified by several theoretical cluster calculations to be a good candidate for the 4−α cluster state. The results of this work suggest the presence of a previously unidentified resonance at Ex≈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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