Linear Chain Structure of Four-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>Clusters in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">O</mml:mi><mml:mprescripts /><mml:none /><mml:mn>16</mml:mn></mml:mmultiscripts></mml:math>

Ichikawa, Takatoshi; Maruhn, J. A.; Itagaki, N.; Ohkubo, S.

doi:10.1103/physrevlett.107.112501

Cited by 101 publications

(115 citation statements)

References 25 publications

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“…Close to the particle emission threshold continuum effects become important for a quantitative description of nuclear clustering [36]. Deformation in light nuclei plays, of course, an important role in the formation of clusters [1,2,6,31,37]. The relationship between α-clusters and single-particle states in deformed nuclei has been extensively studied [31,32,38].…”

Section: Deformations and Excited Configurationsmentioning

confidence: 99%

Density functional theory studies of cluster states in nuclei

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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Section: Deformations and Excited Configurationsmentioning

confidence: 99%

Density functional theory studies of cluster states in nuclei

et al. 2014

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“…It is clear that much work still needs to be performed in order to clarify the situation regarding the four α-linear chain state in 16 O. Measurements in the excitation energy region suggested by the calculations of Ichikawa et al [25] and Yao et al [27], in which the rotational bandhead appears in the E x = 30 -38 MeV region, appear extremely challenging experimentally. However, a high resolution breakup measurement in the present 16 -23 MeV range should be possible.…”

Section: C(mentioning

confidence: 99%

“…However, more recent Skyrme cranked Hartree-Fock calculations by Ichikawa et al [25] suggest that a linear α-chain will only be stable in the 13 -18h angular momentum region. Although the (60 -80 keV) rotational parameter obtained for the four α-chain agrees with both the Chevallier et al [1] measurement and Bauhoff et al…”

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confidence: 99%

Be8+Be8andC
Curtis
¹
,
Aprahamian
²
,
Ashwood
³

et al. 2016
Phys. Rev. C
24
6
13
0
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“…A number of recent studies based on nuclear EDFs or the mean-field approach have analysed cluster structures in α-conjugate nuclei [15][16][17][18][19][20][21]. In Fig.…”

mentioning

confidence: 99%

How atomic nuclei cluster

Ebran

Khan

Nikšić

et al. 2012

Nature

162

243

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Nucleonic matter displays a quantum liquid structure, but in some cases finite nuclei behave like molecules composed of clusters of protons and neutrons. Clustering is a recurrent feature in light nuclei, from beryllium to nickel. For instance, in 12 C the Hoyle state, crucial for stellar nucleosynthesis, can be described as a nuclear molecule consisting of three alpha-particles. The mechanism of cluster formation, however, has not yet been fully understood. We show that the origin of clustering can be traced back to the depth of the confining nuclear potential. By employing the theoretical framework of energy density functionals that encompasses both cluster and quantum liquid-drop aspects of nuclei, it is shown that the depth of the potential determines the energy spacings between single-nucleon orbitals, the localization of the corresponding wave functions and, therefore, the degree of nucleonic density clustering. Relativistic functionals, in particular, are characterized by deep single-nucleon potentials. When compared to non-relativistic functionals that yield similar ground-state properties (binding energy, deformation, radii), they predict the occurrence of much more pronounced cluster structures. More generally, clustering is considered as a transitional phenomenon between crystalline and quantum liquid phases of fermionic systems.The occurrence of molecular states in atomic nuclei and the formation of clusters of nucleons were already predicted in the 30's by von Weizsäcker and Wheeler [1,2]. Even though the description of nuclear dynamics became predominantly based on the concept of independent nucleons in a mean-field potential, a renewed interest in clustering phenomena in the 60's led to the development of dedicated theoretical methods [3]. Numerous experimental studies have revealed a wealth of data on clustering phenomena in light nuclei [4], and modern theoretical approaches use microscopic models that fully take into account single-nucleon degrees of freedom [5][6][7]. Clustering gives rise to nuclear molecules. For instance, in 12 C the second 0 + state the Hoyle state that plays a critical role in stellar nucleosynthesis, is predicted to display a three-α structure [8,9]. The binding energy of the α-particle, formed from two protons and two neutrons, is much larger than in other light nuclei. Cluster radioactivity [10], discovered in the 80's, is another manifestation of clustering in atomic nuclei. Experimental signatures of clustering are usually indirect. Quasi-molecular resonances are probed by scattering one cluster on another, such as in the 12 C+ 12 C system [4,11], and cluster structures are also discernible in the breakup of nuclei. Evidence has been reported for the formation of clusters in ground and excited states of a number of α-conjugate nuclei [4], that is nuclei with an equal even number of protons and neutrons, from 8 Be to 56 Ni.The mechanism of cluster formation in nuclei has not yet been fully understood. Deformation plays an important role because it removes the degenera...

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Linear Chain Structure of Four-αClusters inO16

Cited by 101 publications

References 25 publications

Density functional theory studies of cluster states in nuclei

Density functional theory studies of cluster states in nuclei

Be8+Be8andC
Curtis
¹
,
Aprahamian
²
,
Ashwood
³

et al. 2016
Phys. Rev. C
24
6
13
0
View full text Add to dashboard Cite

How atomic nuclei cluster

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Linear Chain Structure of Four-αClusters inO16

Cited by 101 publications

References 25 publications

Density functional theory studies of cluster states in nuclei

Density functional theory studies of cluster states in nuclei

Be8+Be8andCCurtis1, Aprahamian2, Ashwood3 et al. 2016Phys. Rev. C246130View full textAdd to dashboardCite

How atomic nuclei cluster

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Be8+Be8andC
Curtis
¹
,
Aprahamian
²
,
Ashwood
³

et al. 2016
Phys. Rev. C
24
6
13
0
View full text Add to dashboard Cite