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The A$\approx$100 region is a diverse region of the nuclear chart with the occurrence of different nuclear structure phenomena. For example the well known sudden onset of collectivity in the neutron-rich Sr and Zr isotopes [1,2], the multiple shape coexistence in the neutron-rich stable Cd isotopes [3,4] or the evidences for $\gamma$-softness in the Mo, Ru and Pd isotopes. Lifetimes of excited states in $^{98}$Zr, $^{102}$Mo and $^{112}$Pd were measured using the ($^{18}$O, $^{16}$O) two neutron transfer reaction in combination with the Plunger device at the Cologne FN Tandem accelerator [5.9]. In this reaction, a low amount of momentum and energy is transferred, making it a powerful tool for the investigation of nuclear structures dominating at low energies. This allows a detailed analysis of the shape coexistence phenomena in the Zr and Mo isotopes occurring at the transition from $N=58$ to $N=60$ [6,8] and the nuclear structure related to the $\gamma$-deformation in neutron-rich Mo and Pd isotopes [7,8]. The latter were compared to the interacting boson model (IBM), the Jean-Wilets $\gamma$-soft model and the Davydov-Filippov rigid triaxial rotor model.
[1] P. Cejnar et al., Rev. Mod. Phys. 82, 2155 (2010)
[2] K. Heyde et al., Rev. Mod. Phys. 83, 1467 (2011)
[3] P.E. Garrett et al., Phys. Rev. Lett. 123, 142502 (2019)
[4] P.E. Garrett et al., Phys. Rev. C 101, 044302 (2020)
[5] A. Dewald et al., Progress in Particle and Nuclear Physics 67, 786 (2012)
[6] V. Karayonchev et al., Phys. Rev. C 102, 064314 (2020)
[7] A. Esmaylzadeh et al., Phys. Rev. C 103, 054324 (2021)
[8] A. Esmaylzadeh et al., Phys. Rev. C 104, 064314 (2021)
[9] M. Beckers et al. Phys. Rev. C 102, 014324 (2020)
