Cluster breakup of<sup>18</sup>O and<sup>22</sup>Ne

Ashwood, N. I.; Freer, M.; Sakuta, S.B.; Ahmed, S.; Clarke, Nicholas; Curtis, N.; McEwan, Paul; Metelko, C.; Novatski, B.; Soić, N.; Stepanov, D. N.; Ziman, V.

doi:10.1088/0954-3899/32/4/005

Cited by 19 publications

(27 citation statements)

References 33 publications

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“…The 1 − state at 8.04 MeV was identified as the bandhead of the K π = 0 − inversion doublet band in two recent experiments. 24), 25) Our results clearly indicate that this cannot be the case since dimensionless reduced α-width of this state is very small (0.02). The same conclusion can be reached with respect to the next member of the K π = 0 − inversion doublet band suggested in Ref.…”

Section: §1 Introductionmentioning

confidence: 67%

Clustering in Non-Self-Conjugate Nuclei

Rogachev

Avila

Cherubini

et al. 2012

Prog. Theor. Phys. Suppl.

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Section: §1 Introductionmentioning

confidence: 67%

Clustering in Non-Self-Conjugate Nuclei

Rogachev

Avila

Cherubini

et al. 2012

Prog. Theor. Phys. Suppl.

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“…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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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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“…In Ref. [24], it was proposed that the K π =0 − band built on the 1 − state at 8.04 MeV [23], that was in same energy region with the K π =0 − 2 band predicted by the cluster models, was the parity doublet partner of the K π =0 + α-cluster band. In the case of 20 O, nothing is known about the clustering.…”

Section: Introductionmentioning

confidence: 98%

Cluster Structures in Oxygen Isotopes

Furutachi

Kimura

Doté

et al. 2008

Progress of Theoretical Physics

112

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Cluster structure of 16 O, 18 O and 20 O is investigated by the antisymmettrized molecular dynamics (AMD) plus generator coordinate method (GCM). We have found the K π =0 + 2 and 0 − 1 rotational bands of 18 O that have the prominent 14 C+α cluster structure. Clustering systematics becomes richer in 20 O. We suggest the K π =0 + 2 band that is the mixture of the 12 C+α+4n and 14 C+ 6 He cluster structures, and the K π =0 − 1 band that has the 14 C+ 6 He cluster structure. The K π =0 + 3 and 0 − 2 bands that have the prominent 16 C+α cluster structure are also found.

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Cluster breakup of¹⁸O and²²Ne

Cited by 19 publications

References 33 publications

Clustering in Non-Self-Conjugate Nuclei

Clustering in Non-Self-Conjugate Nuclei

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

Cluster Structures in Oxygen Isotopes

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Cluster breakup of18O and22Ne

Cited by 19 publications

References 33 publications

Clustering in Non-Self-Conjugate Nuclei

Clustering in Non-Self-Conjugate Nuclei

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

Cluster Structures in Oxygen Isotopes

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Cluster breakup of¹⁸O and²²Ne