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First candidates for γ vibrational bands built on the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mrow><mml:mo>[</mml:mo><mml:mn>505</mml:mn><mml:mo>]</mml:mo></mml:mrow><mml:mn>11</mml:mn><mml:mo>/</mml:mo><mml:msup><mml:mn>2</mml:mn><mml:mo>−</mml:mo></mml:msup></mml:mrow></mml:math> neutron orbital in odd- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>A</mml:mi></mml:math> Dy isotopes
Rotational structures have been measured using the Jurogam II and GAMMASPHERE arrays at low spin following the $^{155}\mathrm{Gd}(\ensuremath{\alpha},2n)^{157}\mathrm{Dy}$ and $^{148}\mathrm{Nd}(^{12}\mathrm{C},5n)^{155}\mathrm{Dy}$ reactions at 25 and 65 MeV, respectively. We report high-$K$ bands, which are conjectured to be the first candidates of a ${K}^{\ensuremath{\pi}}={2}^{+}\ensuremath{\gamma}$ vibrational band, built on the $[505]11/{2}^{\ensuremath{-}}$ neutron orbital, …