\begin{document}$\otimes $\end{document}1/2[660]ν↑\begin{document}$\otimes $\end{document}1/2[660]ν↑ three-quasineutron rotational band of 155Dy is examined within the framework of axially symmetric three-quasiparticle plus axially symmetric rotor model. The experimental level energies and magnitudes of observed splitting are well-reproduced with RMS deviations of 68.13 keV and 0.58 keV, respectively. The major contributing bands in the observed splitting are Kπ=7/2–:5/2[512]ν↑\begin{document}$\otimes $\end{document}3/2[651]ν↑\begin{document}$\otimes $\end{document}1/2[660]ν↓, Kπ=5/2–: 5/2[512]ν↑\begin{document}$\otimes $\end{document}3/2[651]ν↑\begin{document}$\otimes $\end{document}3/2[651]ν↓, Kπ=1/2–:3/2[521]ν↑\begin{document}$\otimes $\end{document}1/2[660]ν↑\begin{document}$\otimes $\end{document}3/2[651]ν↓, Kπ=1/2–: 3/2[521]ν↓\begin{document}$\otimes $\end{document}1/2[660]ν↑\begin{document}$\otimes $\end{document}3/2[651]ν↑, Kπ=5/2–:3/2[521]ν↑\begin{document}$\otimes $\end{document}3/2[651]ν↑\begin{document}$\otimes $\end{document}1/2[660]ν↓, and Kπ=3/2–: 3/2[521]ν↑\begin{document}$\otimes $\end{document}3/2[651]ν↑\begin{document}$\otimes $\end{document}3/2[651]ν↓, which mix through rotor-particle (ΔK=1) and particle-particle (ΔK=0) couplings among the bands comprising the given basis space. The observed signature splitting is also well-reproduced by the superposition of calculated energy staggering of the strongly interacting bands, which further strengthens the validity of present particle rotor model calculations. Based on the present calculations, we assign the bandhead spin Kπ= 3/2– to the band under discussion. Additionally, the locations of 13 low-lying band members in the spin range Iπ=3/2– to 23/2– and at 27/2– and 31/2– are predicted, which will be useful for future experimental investigations."> Signature splitting in three-quasineutron rotational band 3/2[521]<sub>ν</sub><inline-formula><tex-math id="Z-20250716144442">\begin{document}$\otimes $\end{document}</tex-math><alternatives><graphic specific-use="online" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/50f830fd-d495-485d-90b9-52d82a5d877d/CPC-2025-0232_Z-20250716144442.jpg"/><graphic specific-use="print" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/50f830fd-d495-485d-90b9-52d82a5d877d/CPC-2025-0232_Z-20250716144442.png"/></alternatives></inline-formula>1/2[660]<sub>ν</sub><inline-formula><tex-math id="Z-20250716143059">\begin{document}$\otimes $\end{document}</tex-math><alternatives><graphic specific-use="online" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/50f830fd-d495-485d-90b9-52d82a5d877d/CPC-2025-0232_Z-20250716143059.jpg"/><graphic specific-use="print" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/50f830fd-d495-485d-90b9-52d82a5d877d/CPC-2025-0232_Z-20250716143059.png"/></alternatives></inline-formula>1/2[660]<sub>ν </sub>of <sup>155</sup>Dy -
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