High-spin states in 22Ne populated in the 14C(12C, α)reaction

Torilov, S. Yu.; Brenner, M.; Goldberg, V. Z.; Gridnev, K. A.; Khlebnikov, S. V.; Korovitskaya, T. V.; Lönnroth, T.; Mutterer, M.; Norrby, M.; Novatski, B.; Rubchenya, V. A.; Slotte, J. M. K.; Sobolev, Yu. G.; Trzaska, W. H.; Tyurin, G. P.; Vinogradov, L.; Zherebchevskii, V.

doi:10.1140/epja/i2011-11158-4

Cited by 8 publications

(5 citation statements)

References 31 publications

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“…AMD results and also other theoretical calculations [201][202][203] show good agreement with the observed energies, moment of inertia and αRWA [195][196][197]200].…”

Section: As Shown Insupporting

confidence: 83%

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Antisymmetrized molecular dynamics studies for exotic clustering phenomena in neutron-rich nuclei

Kimura¹,

Suhara²,

Kanada-En’yo³

2016

Eur. Phys. J. A

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We present a review of recent works on clustering phenomena in unstable nuclei studied by antisymmetrized molecular dynamics (AMD). The AMD studies in these decades have uncovered novel types of clustering phenomena brought about by the excess neutrons. Among them, this review focuses on the molecule-like structure of unstable nuclei.One of the earliest discussions on the clustering in unstable nuclei was made for neutron-rich Be and B isotopes. AMD calculations predicted that the ground state clustering is enhanced or reduced depending on the number of excess neutrons. Today, the experiments are confirming this prediction as the change of the proton radii. Behind this enhancement and reduction of the clustering, there are underlying shell effects called molecular-and atomic-orbits. These orbits form covalent and ionic bonding of the clusters analogous to the atomic molecules. It was found that this "molecular-orbit picture" reasonably explains the low-lying spectra of Be isotopes. The molecular-orbit picture is extended to other systems having parity asymmetric cluster cores and to the three cluster systems. O and Ne isotopes are the candidates of the former, while the 3α linear chains in C isotopes are the latter. For both subjects, many intensive studies are now in progress.We also pay a special attention to the observables which are the fingerprint of the clustering. In particular, we focus on the monopole and dipole transitions which are recently regarded as good probe for the clustering. We discuss how they have and will reveal the exotic clustering.where X denotes Z i , ν or χ i . λ and µ are arbitrary numbers, but µ must have negative sign. The energy of the system H is defined as (8) As time t being evolved by the Eq. (7), the energy of the system is decreased and we obtain the set of parameters which minimizes the energy of the system. The calculation which employs the eigenstate of the parity Φ π to evaluate the energy is called variation before angular momentum projection (VBP), while the calculation employing the eigenstate of parity and angular momentum Φ Jπ M K is called variation after angular momentum projection (VAP) [42]. In the case of VBP, the angular momentum projection is performed after the energy minimization.To obtain the wave functions which have the configurations different from the energy minimum, the constrained energy minimization is often performed in VBP calculations. For example, the constraint on the quadrupole deformation parameter β is imposed by adding the constraint potential to the energy asHere, the magnitude of constraint potential v β is chosen large enough so that the deformation parameter β of the wave function approximately equals to β 0 after the energy minimization.Another way to obtain the excited configurations is orthogonalization method [42] that is used in VAP calculatons in which the variational wave function is orthogonalized to the energy minimum state By applying this procedure successively, the second, third and more excited configurations are obtained. He...

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“…AMD results and also other theoretical calculations [201][202][203] show good agreement with the observed energies, moment of inertia and αRWA [195][196][197]200].…”

Section: As Shown Insupporting

confidence: 83%

“…Above these molecular-orbit-like doublet, the atomic-orbit doublet having α + 16 C con- [200,[205][206][207][208][209][210][211][212][213]. Fig.…”

Section: α Clustering In O Isotopesmentioning

confidence: 99%

Antisymmetrized molecular dynamics studies for exotic clustering phenomena in neutron-rich nuclei

Kimura¹,

Suhara²,

Kanada-En’yo³

2016

Eur. Phys. J. A

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“…At the same time, the negative parity bands, which are doublets in the cluster model, require higher order particle-hole configurations xp-yh, making their shell model description more complicated. Though there are no reliable experimen tal data for all members of high lying states, the AMD predictions for bands with different structures of quasi molecular bonding [5] allow us to explain a great many of the closely spaced states with spin 9that we experimentally observed in [9].…”

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confidence: 96%

“…On the other hand, a great many experimental results have recently been obtained from investigating rotational bands in 18, 20 O [7, 8] and 22 Ne nuclei [9], which allows phenomenological analysis of the mani festation of clustering as a global property of light nuclei and the results to be compared with the predic tions of exact quantum mechanical models.…”

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confidence: 99%

“…To describe bands with high moments of inertia in the 18 O nucleus, a structure of the form 12 C + 2n + α was pro posed [7]. Assuming that in the 22 Ne nucleus there are bands of a similar structure that are parity split as in the 18 O nucleus, we may conclude that the 10 + and 11states that we experimentally observed in [9] belong to them. Figure 2 shows the assumed bands with the moment of inertia 0.081 MeV for the 22 Ne nucleus (solid line).…”

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Cluster states in neutron-rich nuclei

Torilov

Gridnev

Korovitskaya

2013

Bull. Russ. Acad. Sci. Phys.

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849As was shown in [1,2], the phenomenon of cluster ing in self conjugate nuclei of the light and medium mass groups is important even for describing ground state nuclear properties. The limiting case of this phe nomenon could be occurrence of the Bose-Einstein condensate [3] or of states with extremely high defor mation close to chain configurations [4]. The most frequently arising case is, however, the occurrence of one valence alpha particle near the core, which leads to the octupole deformation of the entire nucleus and consequently to the occurrence of a family of rota tional bands.Rotational bands in light nuclei are often used to verify various cluster model predictions. Considerable progress in describing these bands in the 16 O and 20 Ne nuclei allowed us to investigate nuclei with a neutron excess. After the structure of the beryllium nuclei with different neutron numbers was successfully described within the AMD model [5], an attempt was made to predict the properties of rotational bands in the 22 Ne nucleus [6]. As is well known, the 20 Ne nucleus has many bands, most of which are well studied and exhibit a pronounced cluster nature, which allows a great variety of states to be expected in the case of neu tron excess.On the other hand, a great many experimental results have recently been obtained from investigating rotational bands in 18, 20 O [7, 8] and 22 Ne nuclei [9], which allows phenomenological analysis of the mani festation of clustering as a global property of light nuclei and the results to be compared with the predic tions of exact quantum mechanical models.In [10], Buck et al. introduced a simple two body potential for describing low lying rotational bands in the 20 Ne and 44 Ti nuclei. It was shown that the poten tial not only determined the positions of the excited levels with sufficient accuracy but also permitted the widths of the states to be estimated and could be used within the optical model. This type of potential was later extended to the rotational states of the 40 Ca nucleus [11]. As was mentioned in [12], the above potential was applicable not only to the alpha particle plus closed shell core systems but also to heavier clus ters and nuclei with particles (holes) in their shell con figuration.Application of the potential from [10] to the 16, 18, 20 O and 20, 22 Ne nuclei resulted in a good descrip tion of low lying rotational bands [13]. The correct value obtained for the theoretical moment of inertia shows that all considered states have very large contri butions from structures like the α + core and do not contain a heavier 6 He nucleus as a cluster. This is valid to a high degree of accuracy even for the 20 O nucleus, for which the theoretical splitting value is slightly higher than the experimental value. This allows the conclusion that the cluster structure manifests itself more globally in light mass and medium mass nuclei with neutron excess [12].Let us consider the known low lying rotational states in nuclei up to titanium, inclusive. Figure 1 shows the parameter o...

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Covalent Binding on the Femtometer Scale: Nuclear Molecules

Oertzen

Milin

2014

Clusters in Nuclei, Volume 3

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High-spin states in 22Ne populated in the 14C(12C, α)reaction

Cited by 8 publications

References 31 publications

Antisymmetrized molecular dynamics studies for exotic clustering phenomena in neutron-rich nuclei

Antisymmetrized molecular dynamics studies for exotic clustering phenomena in neutron-rich nuclei

Cluster states in neutron-rich nuclei

Covalent Binding on the Femtometer Scale: Nuclear Molecules

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