Refuting the nature of the sixth 0+ Hoyle-analogue state candidate in 16O

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

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Abstract

A prominent candidate for a Hoyle-analogue state in 16O is the 0+ 6 state, previously observed 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, analogous to the Hoyle state in 12C. Whilst much theoretical work has been performed to reconcile a calculated α-cluster state with this resonance, the experimental information on this state remained very scarce. To investigate this state, the 16O(α, α') reaction was studied at θlab = 0° at an incident energy of Elab = 200 MeV using the K600 magnetic spectrometer at iThemba LABS. For the first time, the decay channels of the Ex = 15.097(5) MeV state were isolated using a large acceptance silicon-strip detector array at backward angles. The lineshapes of the states were analysed within a phenomenological R-matrix framework. Results indicate the presence of a resonance at Ex ≈ 15 MeV which does not exhibit a Jπ = 0+ nature.

Original languageEnglish
Article number040
Number of pages8
JournalProceedings of Science
Volume281
Issue numberSeptember 2016
Early online date4 May 2017
DOIs
Publication statusPublished - 1 Dec 2017
Event26th International Nuclear Physics Conference, INPC 2016 - Adelaide, Australia
Duration: 11 Sep 201616 Sep 2016

ASJC Scopus subject areas

  • General

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