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Yrare low-spin positive-parity states in N = 88 15466 Dy

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Abstract.

Low-spin positive-parity yrare states of 15466 Dy88 were established using the 155Gd(3He,4n) reaction at a beam energy of \(E_{lab} = 37.5\) MeV. The AFRODITE spectrometer array at iThemba LABS was used to record \(\gamma\gamma\) coincidences and measure DCO ratios and polarisation asymmetries. The \(K^{\pi}=2^{+}\) \( \gamma\) band has been observed up to spin \(13^{+}\) in the odd spins and to \( 12^{+}\) in the even spins. The staggering parameter S(I) of the \( \gamma\) band is compared to that found in other N = 88 isotones. Different behaviour of S(I) with increasing spin is observed for each of the isotones. We conjecture that the variation in S(I) is mainly due to mixing of the even-spin states with the same spin and parity states in neighbouring rotational bands. A second \( K^{\pi}=2^{+}\) band has been established up to a spin of \( 12^{+}\) in the even spins. We suggest that this is a \( \gamma\) band based on the \( J^{\pi} = 0^{+}\) state at \( E_{x} = 660.6\) keV.

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Correspondence to G. L. Zimba.

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Communicated by P. Woods

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Zimba, G.L., Bvumbi, S.P., Masiteng, L.P. et al. Yrare low-spin positive-parity states in N = 88 15466 Dy. Eur. Phys. J. A 54, 59 (2018). https://doi.org/10.1140/epja/i2018-12496-3

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