Coexistence of Cluster States and Mean-Field-Type States

Horiuchi, Hisashi

doi:10.1007/978-3-642-13899-7_2

“…A unique feature of light nuclei is the coexistence of the nuclear mean-field and cluster structures, as expressed by the well-known Ikeda diagram [29][30][31][32][33]. A certain degree of localization of nucleonic densities is already present in mean-field ground-state configurations [4,34,35], and this facilitates the formation of cluster structures in excited states.…”

Section: Deformations and Excited Configurationsmentioning

confidence: 99%

Density functional theory studies of cluster states in nuclei

Ebran

¹

,

Khan

²

,

Nikšić

³

et al. 2014

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The framework of nuclear energy density functionals is applied to a study of the formation and evolution of cluster states in nuclei. The relativistic functional DD-ME2 is used in triaxial and reflection-asymmetric relativistic Hartree-Bogoliubov calculations of relatively light N = Z and neutron-rich nuclei. The role of deformation and degeneracy of single-nucleon states in the formation of clusters is analyzed, and interesting cluster structures are predicted in excited configurations of Be, C, O, Ne, Mg, Si, S, Ar and Ca N = Z nuclei. Cluster phenomena in neutron-rich nuclei are discussed, and it is shown that in neutron-rich Be and C nuclei cluster states occur that are characterized by molecular bonding of α-particles by the excess neutrons.

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“…An identical conclusion was reached for the 40 Ca composite system where SD bands have been discovered [43]. Therefore, similar investigations are underway for heavier α-like composite systems such as 44 Ti [6], 48 Cr [45] and 56 Ni [46,47].…”

Section: Alpha Clustering Nuclear Molecules and Large Deformationsmentioning

confidence: 56%

New Horizons in Fundamental Physics

Schramm¹,

Schäfer²

2017

7

0

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Fig. 1. Different types of clustering in nuclei that have been discussed the last two decades [2].A great deal of research work has been undertaken in α-clustering study since the pioneering discovery of 12 C+ 12 C molecular resonances half a century ago. Our knowledge on physics of nuclear molecules has increased considerably and nuclear clustering remains one of the most fruitful domains of nuclear physics, facing some of the greatest challenges and opportunities in the years ahead. The occurrence of "exotic" shapes in light N =Z α-like nuclei is investigated. Various approaches of the superdeformed and hyperdeformed bands associated with quasimolecular resonant structures are presented. Evolution of clustering from stability to the drip-lines is examined: clustering aspects are, in particular, discussed for light exotic nuclei with large neutron excess such as neutron-rich Oxygen isotopes with their complete spectroscopy.

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“…4 that displays axially and reflection symmetric self-consistent equilibrium nucleon density distributions. We note the well known quasimolecular α-12 C-α structure although clustering effects are less pronounced than the ones predicted by Nilsson-Strutinsky calculations and even by mean-field calculations (including Hartree-Fock and/or Hartree-Fock-Bogoliubov calculations) [5,6,7,58].…”

Section: Condensation Of α Clusters In Light Nucleimentioning

confidence: 56%

“…The real link between superdeformation (SD), nuclear molecules and α clustering [6,41] is of particular interest, since nuclear shapes with majorto-minor axis ratios of 2:1 have the typical ellipsoidal elongation for light nuclei i.e. with quadrupole deformation parameter β 2 ≈ 0.6.…”

Section: Alpha Clustering Nuclear Molecules and Large Deformationsmentioning

confidence: 99%

“…The question of how quasimolecular resonances may reflect continuous transitions from scattering states in the ion-ion potential to true cluster states in the compound systems was still unresolved in the 1990s [1]. In many cases, these resonant structures have been associated with strongly-deformed shapes and with α-clustering phenomena [5,6], predicted from the Nilsson-Strutinsky approach, the cranked α-cluster model [5], or other mean-field calculations [6,7]. In light α-like nuclei clustering is observed as a general phenomenon at high excitation energy close to the α-decay thresholds [5,8].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

From the Stable to the Exotic: Clustering in Light Nuclei

Beck¹

2016

New Horizons in Fundamental Physics

1

0

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Fig. 1. Different types of clustering in nuclei that have been discussed the last two decades [2].A great deal of research work has been undertaken in α-clustering study since the pioneering discovery of 12 C+ 12 C molecular resonances half a century ago. Our knowledge on physics of nuclear molecules has increased considerably and nuclear clustering remains one of the most fruitful domains of nuclear physics, facing some of the greatest challenges and opportunities in the years ahead. The occurrence of "exotic" shapes in light N =Z α-like nuclei is investigated. Various approaches of the superdeformed and hyperdeformed bands associated with quasimolecular resonant structures are presented. Evolution of clustering from stability to the drip-lines is examined: clustering aspects are, in particular, discussed for light exotic nuclei with large neutron excess such as neutron-rich Oxygen isotopes with their complete spectroscopy.

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Coexistence of Cluster States and Mean-Field-Type States

Cited by 24 publications

References 98 publications

Density functional theory studies of cluster states in nuclei

Density functional theory studies of cluster states in nuclei

New Horizons in Fundamental Physics

From the Stable to the Exotic: Clustering in Light Nuclei

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