α -particle condensation: A nuclear quantum phase transition
| Autor: | R. D. Lasseri, J.-P. Ebran, Michel Girod, E. Khan, P. Schuck |
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| Přispěvatelé: | Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11) |
| Rok vydání: | 2020 |
| Předmět: |
Quantum phase transition
Physics Nuclear Theory [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] 010308 nuclear & particles physics Condensation Spectrum (functional analysis) FOS: Physical sciences Nuclear Structure Nuclear matter 01 natural sciences Molecular physics Mott transition Nuclear Theory (nucl-th) medicine.anatomical_structure 0103 physical sciences Saturation (graph theory) medicine 010306 general physics α particles Nucleus |
| Zdroj: | Physical Review C Physical Review C, American Physical Society, 2020, 102 (1), pp.014305. ⟨10.1103/PhysRevC.102.014305⟩ Phys.Rev.C Phys.Rev.C, 2020, 102 (1), pp.014305. ⟨10.1103/PhysRevC.102.014305⟩ |
| ISSN: | 2469-9993 2469-9985 |
| DOI: | 10.1103/physrevc.102.014305 |
| Popis: | When the density of a nuclear system is decreased, homogeneous states undergo the so-called Mott transition towards clusterised states, e.g. alpha clustering, both in nuclei and in nuclear matter. Here we investigate such a quantum phase transition (QPT) by using microscopic energy density functional (EDF) calculations both with the relativistic and the Gogny approaches on the diluted $^{16}$O nucleus. The evolution of the corresponding single-particle spectrum under dilution is studied, and a Mott-like transition is predicted at about 1/3 of the saturation density. Complementary approaches are used in order to understand this QPT. A study of spatial localisation properties as a function of the density allows to derive a value of the Mott density in agreement with the one obtained by fully microscopic calculations in $^{16}$O and in nuclear matter. Moreover a study of the spontaneous symmetry breaking of the rotational group in $^{16}$O, down to the discrete tetrahedral one, provides further insight on the features displayed by the single-particle spectrum obtained within the EDF approach.The content of the tetrahedrally deformed A-nucleon product state in terms of spherical particle-hole configurations is investigated. Finally a study of quartet condensation and the corresponding macroscopic QPT is undertaken in infinite matter. Comment: 13 pages, 13 figures |
| Databáze: | OpenAIRE |
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