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Abstract
12C is synthesised in stars by fusion of three α particles. This process occurs through a resonance in the 12C nucleus, famously known as the Hoyle state. In this state, the 12C nucleus exists as a cluster of α particles. The state is the band-head for a rotational band with the 2+ rotational excitation predicted in the energy region 9 - 11 MeV. This rotational excitation can affect the triple-α process reaction rate by more than an order of magnitude at high temperatures (109 K). Depending on the energy of the resonance, the knowledge of the state can also help determine the structure of the Hoyle state. In the work presented here, the state of interest is populated by beta decay of radioactive 12N ion beam delivered by the IGISOL facility at JYFL, Jyväskylä.
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Details
1 Department of Physics, University of York, YO10 5DD, UK
2 Institut Pluridisciplinaire Hubert Curien, 67037 Strasbourg Cedex 2, France
3 Department of Physics and Astronomy, University of Aarhus, 8000 Arhus C, Denmark
4 Instituto Estructura de la Materia, CSIC, Serrano 113bis, E-28006, Madrid, Spain; IKS, Leuven, Belgium
5 Instituto Estructura de la Materia, CSIC, Serrano 113bis, E-28006, Madrid, Spain
6 Department of Physics, University of Jyväskylä, FIN-40351 Jyväskylä, Finland