Abstract
The excited states in are investigated by using an extended version of the so-called Tohsaki-Horiuchi-Schuck-Röpke (THSR) wave function, where both the condensate and cluster asymptotic configurations are included. A new method is also used to resolve spurious continuum coupling with physical states. I focus on the structures of the “Hoyle band” states (, and ), which were recently observed above the Hoyle state, and of the and states, which were also quite recently identified in experiment. Their resonance parameters and decay properties are reasonably reproduced. All these states have dilute density structure of the or clusters with larger root mean square radii than that of the Hoyle state. The Hoyle band is not simply considered to be the rotation as suggested by previous cluster model calculations, nor to be a rotation of a rigid-body triangle-shaped object composed of the particles. This is mainly due to the specificity of the Hoyle state, which has the condensate structure and gives rise to the state with a prominent structure as a result of very strong monopole excitation from the Hoyle state.
- Received 25 August 2014
- Revised 26 June 2015
DOI:https://doi.org/10.1103/PhysRevC.92.021302
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