α clustering in ²⁸Si probed through the identification of high-lying 0⁺ states

dc.contributor.authorAdsley, P.en_ZA
dc.contributor.authorJenkins, D. G.en_ZA
dc.contributor.authorCseh, J.en_ZA
dc.contributor.authorDimitriova, S. S.en_ZA
dc.contributor.authorBrummer, J. W.en_ZA
dc.contributor.authorLi, K. C. W.en_ZA
dc.contributor.authorMarin-Lambarri, D. J.en_ZA
dc.contributor.authorLukyanov, K.en_ZA
dc.contributor.authorKheswa, N. Y.en_ZA
dc.contributor.authorNeveling, R.en_ZA
dc.contributor.authorPapka, P.en_ZA
dc.contributor.authorPellegri, L.en_ZA
dc.contributor.authorPesudo, V.en_ZA
dc.contributor.authorPool, L. C.en_ZA
dc.contributor.authorRiczu, G.en_ZA
dc.contributor.authorSmit, F. D.en_ZA
dc.contributor.authorVan Zyl, J. J.en_ZA
dc.contributor.authorZemlyanaya, E.en_ZA
dc.identifier.citationAdsley, P., et al. 2017. α clustering in ²⁸Si probed through the identification of high-lying 0⁺ states. Physical Review C, 95(2):1-8, doi:10.1103/PhysRevC.95.024319
dc.identifier.issn2469-9993 (online)
dc.identifier.issn2469-9985 (print)
dc.descriptionCITATION: Adsley, P., et al. 2017. α clustering in ²⁸Si probed through the identification of high-lying 0⁺ states. Physical Review C, 95(2):1-8, doi:10.1103/PhysRevC.95.024319.
dc.descriptionThe original publication is available at
dc.description.abstractBackground: 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 ¹²C and ¹⁶O. Such structures are associated with strong deformation corresponding to superdeformed or even hyperdeformed bands. Superdeformed bands have been identified in ⁴⁰Ca 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 ²⁴Mg, ²⁸Si, and ³²S. Purpose: The purpose of this study is to look for the number and energy of isoscalar 0⁺ states in ²⁸Si. These states are the potential bandheads for superdeformed bands in ²⁸Si corresponding to the exotic structures of ²⁸Si. Of particular interest is locating the 0⁺ bandhead of the previously identified superdeformed band in ²⁸Si. Methods: α-particle inelastic scattering from a natSi 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 ²⁸Si. 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 ²⁸Si have been identified. The number of states observed in the present experiment shows good agreement with the prediction of the multichannel dynamical symmetry.en_ZA
dc.format.extent8 pages
dc.publisherAmerican Physical Society
dc.subjectNuclear structureen_ZA
dc.subjectExcited state chemistryen_ZA
dc.subjectO+ statesen_ZA
dc.subjectNuclear shapesen_ZA
dc.subjectCluster theory (Nuclear physics)en_ZA
dc.titleα clustering in ²⁸Si probed through the identification of high-lying 0⁺ statesen_ZA
dc.description.versionPublisher's version
dc.rights.holderAmerican Physical Society

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