Shape isomers and clusterization in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>28</mml:mn></mml:msup></mml:math>Si nucleus

Darai, J.; Cseh, J.; Jenkins, D. G.

doi:10.1103/physrevc.86.064309

Cited by 46 publications

(31 citation statements)

References 37 publications

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“…For example, in an antisymmetrized molecular dynamics (AMD) study [4], it was pointed out that the ground-state band and SD band have large overlap with the 24 Mg + α cluster configurations, while the prolate band largely overlaps with the 12 C + 16 O configuration. A similar point was also made using the algebraic cluster model [9,13,33,34]. It is also noted that the α and carbon cluster states at their decay thresholds are of astrophysical interest and importance, because they are closely related to and seriously affect to stellar processes such as the He and C burning.…”

Section: Introductionmentioning

confidence: 71%

“…Then, they are superposed to describe the eigenstates of (13) In the following, we call the thus-obtained wave function the GCM wave function.…”

Section: B Angular Momentum Projection and Generator Coordinate Methodsmentioning

confidence: 99%

“…It is believed that the β vibration of the ground-state band yields another rotational band built on the 0 + 2 state [5,8]. Furthermore, the possible existence of the superdeformed (SD) state is predicted by theoretical studies [4,[9][10][11][12][13] and the experimental candidates were observed [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Inversion doublets of reflection-asymmetric clustering in Si28 and their isoscalar monopole and dipole transitions

2017

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Background: Various cluster states of astrophysical interest are expected to exist in the excited states of 28 Si. However, they have not been identified firmly, because of the experimental and theoretical difficulties. Purpose: To establish the 24 Mg + α, 16 O + 12 C, and 20 Ne + 2α cluster bands, we theoretically search for the negative-parity cluster bands that are paired with the positive-parity bands to constitute the inversion doublets. We also offer the isoscalar monopole and dipole transitions as a promising probe for the clustering. We numerically show that these transition strengths from the ground state to the cluster states are very much enhanced.

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Section: Introductionmentioning

confidence: 71%

“…Then, they are superposed to describe the eigenstates of (13) In the following, we call the thus-obtained wave function the GCM wave function.…”

Section: B Angular Momentum Projection and Generator Coordinate Methodsmentioning

confidence: 99%

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Inversion doublets of reflection-asymmetric clustering in Si28 and their isoscalar monopole and dipole transitions

2017

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“…However, despite the considerable theoretical investigation there is a lack of experimental evidence for these configurations. Although there is strong theoretical and experimental evidence for a superdeformed band in 28 Si [3,5,7], the location of the 0 + band-head remains unknown. The locations of other excited 0 + states in 28 Si are unclear with some contradictory spin-parity assignments made for some states [8].…”

Section: Introductionmentioning

confidence: 99%

α clustering in Si28 probed through the identification of high-lying 0+ states

et al. 2017

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Background: Aspects of the nuclear structure of light α-conjugate nuclei have long been associated with nuclear clustering based on α particles and heavier α-conjugate systems such as 12 C and 16 O. Such structures are associated with strong deformation corresponding to superdeformed or even hyperdeformed bands. Superdeformed bands have been identified in 40 Ca and neighboring nuclei and find good description within shell model, mean-field, and α-cluster models. The utility of the α-cluster description may be probed further by extending such studies to more challenging cases comprising lighter α-conjugate nuclei such as 24 Mg, 28 Si, and 32 S. Purpose: The purpose of this study is to look for the number and energy of isoscalar 0 + states in 28 Si. These states are the potential bandheads for superdeformed bands in 28 Si corresponding to the exotic structures of 28 Si. Of particular interest is locating the 0 + bandhead of the previously identified superdeformed band in 28 Si. Methods: α-particle inelastic scattering from a nat Si target at very forward angles including 0• has been performed at the iThemba Laboratory for Accelerator-Based Sciences in South Africa. Scattered particles corresponding to the excitation energy region of 6 to 14 MeV were momentum-analysed in the K600 magnetic spectrometer and detected at the focal plane using two multiwire drift chambers and two plastic scintillators. Results: Several 0 + states have been identified above 9 MeV in 28 Si. A newly identified 9.71 MeV 0 + state is a strong candidate for the bandhead of the previously discussed superdeformed band. The multichannel dynamical symmetry of the semimicroscopic algebraic model predicts the spectrum of the excited 0 + states. The theoretical prediction is in good agreement with the experimental finding, supporting the assignment of the 9.71-MeV state as the bandhead of a superdeformed band. Conclusion: Excited isoscalar 0+ states in 28 Si have been identified. The number of states observed in the present experiment shows good agreement with the prediction of the multichannel dynamical symmetry.

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“…Inspired by this exciting situation with open questions on the SD state, we have carried out an independent theoretical analysis of highly-deformed structures in 28 Si [37]. In particular we performed a Nilsson-calculation, combined with quasi-dynamical U(3) considerations, and determined the allowed binary clusterizations of the shape isomers.…”

Section: Simentioning

confidence: 99%

Extreme quadrupole deformation and clusterization

Darai

Cseh

Adamian

et al. 2012

EPJ Web of Conferences

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Abstract. We discuss a simple symmetry-adapted method for the determination of the shape isomers, and for the study of their possible fragmentation. In other words the connection between the quadrupole (collective) and dipole (cluster) degrees of freedom is considered in terms of an easily applicable, yet microscopic method. The energetics is taken into account by the double-folding method. Special attention is focused on those cases in which the theoretical predictions have a direct comparison with experimental observation.

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Shape isomers and clusterization in the28Si nucleus

Abstract: The shape isomers of the 28

Cited by 46 publications

References 37 publications

Inversion doublets of reflection-asymmetric clustering in Si28 and their isoscalar monopole and dipole transitions

Inversion doublets of reflection-asymmetric clustering in Si28 and their isoscalar monopole and dipole transitions

α clustering in Si28 probed through the identification of high-lying 0+ states

Extreme quadrupole deformation and clusterization

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