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γ-band staggering and E(5)-type structure: ${}^{64}{Zn}$

C. Mihai, N. V. Zamfir, D. Bucurescu, G. Căta-Danil^*, I. Căta-Danil, D. G. Ghiţă, M. Ivaşcu, T. Sava, L. Stroe et al.

G. Suliman

National Institute of Physics and Nuclear Engineering, Bucharest-Măgurele, Romania

^*Permanent address: Physics Department, University Politehnica of Bucharest, Romania.

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Phys. Rev. C 75, 044302 – Published 6 April, 2007

DOI: https://doi.org/10.1103/PhysRevC.75.044302

Abstract

The staggering factor $S_{4}$ in the quasi-γ band was used for the first time as a signature of the E(5) symmetry. This observable, together with the $R_{4 / 2}$ ratio is used to find E(5) type nuclei in the $Z = 28 – 50$ and $Z = 50 – 82$ shells. An E(5) candidate is found to be ${}^{64}{Zn}$ . Low-spin states in ${}^{64}{Zn}$ populated in the $ε / β^{+}$ decay of ${}^{64}{Ga}$ , produced in the ${}^{54}{Fe}$ ( ${}^{12}C$ , $pn$ ) ${}^{64}{Ga}$ , were studied through off-beam γ-ray spectroscopy. The decay scheme of ${}^{64}{Zn}$ is found to be reasonably close to the predictions of the E(5) critical point symmetry. The structure of the excited $0^{+}$ states in ${}^{64}{Zn}$ and their behavior in the Zn isotopic chain is discussed.

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γ-band staggering and E(5)-type structure: ${}^{64}{Zn}$

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γ-band staggering and E(5)-type structure: Zn64

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References (33)

γ-band staggering and E(5)-type structure: ${}^{64}{Zn}$