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Microscopic study of 4α-particle condensation with inclusion of resonances

Abstract : The 4α condensate state for 16O is discussed with the Tohsaki-Horiuchi-Schuck-Röpke (THSR) wave function which has α-particle condensate character. With a treatment of resonances, it is found that the 4α THSR wave function yields a fourth 0+ state in the continuum above the 4α-breakup threshold, in addition to the three 0+ states obtained in a previous analysis. It is shown that this fourth 0+ [(04+)THSR] state has a structure analogous to that of the Hoyle state because it has a very dilute density and a large component of α+12C(02+) configuration. Furthermore, single-α motions are extracted from the microscopic 16-nucleon wave function, and the condensate fraction and momentum distribution of α particles are quantitatively discussed. It is found that for the (04+)THSR state a large α-particle occupation probability concentrates on a single-α 0S orbit and the α-particle momentum distribution has a δ-function-like peak at zero momentum, both indicating that the state has a strong 4α condensate character. It is argued that the (04+)THSR state is the counterpart of the 06+ state which was obtained as the 4α condensate state in the previous 4α orthogonality condition model calculation and therefore is likely to correspond to the 06+ state observed at 15.1 MeV. The necessity of including α+12C configurations in the THSR wave function is pointed out.
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Contributor : Sophie Heurteau <>
Submitted on : Monday, August 30, 2010 - 2:24:31 PM
Last modification on : Wednesday, July 28, 2021 - 4:01:50 AM

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Y. Funaki, T. Yamada, A. Tohsaki, H. Horiuchi, G. Röpke, et al.. Microscopic study of 4α-particle condensation with inclusion of resonances. Physical Review C, American Physical Society, 2010, 82, pp.024312. ⟨10.1103/PhysRevC.82.024312⟩. ⟨in2p3-00511877⟩

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