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Quartetting in Fermionic Matter and Alpha-Particle Condensation in Nuclear Systems

Abstract : Quantum condensates in nuclear matter are treated beyond the mean-field approximation, with the inclusion of cluster formation. The occurrence of a separate binding pole in the four-particle propagator in nuclear matter is investigated with respect to the formation of a condensate of α-like particles (quartetting), which is dependent on temperature and density. Due to Pauli blocking, the formation of an α-like condensate is limited to the low-density region. Consequences for finite nuclei are considered. In particular, excitations of self-conjugate 2n-Z–2n-N nuclei near the n-α-breakup threshold are candidates for quartetting. We review some results and discuss their consequences. Exploratory calculations are performed for the density dependence of the α condensate fraction at zero temperature to address the suppression of the four-particle condensate below nuclear-matter density.
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http://hal.in2p3.fr/in2p3-00120914
Contributor : Suzanne Robert <>
Submitted on : Monday, December 18, 2006 - 5:13:36 PM
Last modification on : Saturday, January 2, 2021 - 4:36:01 PM

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G. Röpke, P. Schuck. Quartetting in Fermionic Matter and Alpha-Particle Condensation in Nuclear Systems. RCNP Osaka Spring Workshop on Cluster Condensation and Nucleon Correlation in Nuclei, Apr 2006, Osaka, Japan. pp.2513-2546, ⟨10.1142/S0217732306022183⟩. ⟨in2p3-00120914⟩

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