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

Research output: Contribution to journalConference articlepeer-review


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

Colleges, School and Institutes

External organisations

  • National Research Foundation
  • University of York
  • University of Groningen
  • University of the Western Cape
  • KU Leuven


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
Issue numberSeptember 2016
Early online date4 May 2017
Publication statusPublished - 1 Dec 2017
Event26th International Nuclear Physics Conference, INPC 2016 - Adelaide, Australia
Duration: 11 Sep 201616 Sep 2016

ASJC Scopus subject areas