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Hoyle band and α condensation in C12

Y. Funaki
Phys. Rev. C 92, 021302(R) – Published 3 August 2015

Abstract

The excited states in C12 are investigated by using an extended version of the so-called Tohsaki-Horiuchi-Schuck-Röpke (THSR) wave function, where both the 3α condensate and Be8+α 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 (02+,22+, and 42+), which were recently observed above the Hoyle state, and of the 03+ and 04+ 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 3α or Be8+α clusters with larger root mean square radii than that of the Hoyle state. The Hoyle band is not simply considered to be the Be8(0+)+α rotation as suggested by previous cluster model calculations, nor to be a rotation of a rigid-body triangle-shaped object composed of the 3α particles. This is mainly due to the specificity of the Hoyle state, which has the 3α condensate structure and gives rise to the 03+ state with a prominent Be8(0+)+α structure as a result of very strong monopole excitation from the Hoyle state.

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  • Received 25 August 2014
  • Revised 26 June 2015

DOI:https://doi.org/10.1103/PhysRevC.92.021302

©2015 American Physical Society

Authors & Affiliations

Y. Funaki*

  • Nishina Center for Accelerator-Based Science, Institute of Physical and Chemical Research (RIKEN), Wako 351-0198, Japan

  • *funaki@riken.jp

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Issue

Vol. 92, Iss. 2 — August 2015

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