The well-known spherical-deformed-transitional nucleus and potential $0\nu \beta \beta$emitter ${}^{150}\mathrm{Nd}$and its daughter ${}^{150}\mathrm{Sm}$were investigated in nuclear resonance fluorescence experiments using quasimonoenergetic, linearly polarized $\gamma$-ray beams. For both nuclei transitions from the $1^{+}$ scissors mode to the $0_2^{+}$ and $2_2^{+}$ states were observed for the first time and their respective $M1$ transition strengths were determined. Through a systematic investigation, a sensitivity of these transition strengths to the three Majorana parameters of the interacting boson model-2 (IBM-2) was established. In combination with the novel experimental data, this poses strong constraints to the Majorana parameters in improved IBM-2 representations of both nuclei. A subsequent recalculation of the nuclear matrix elements (NMEs) for the ${}^{150}\mathrm{Nd}\to {}^{150}\mathrm{Sm} 0\nu \beta \beta$decay in the IBM-2 with these improved representations results in $M_{\text{IBM-2}}^{\left(0\nu \beta \beta \right)}\left[0_1^{+}\right]=3.35$ for the NME for $0\nu \beta \beta$decay into the ground state of ${}^{150}\mathrm{Sm}$and $M_{\text{IBM-2}}^{\left(0\nu \beta \beta \right)}\left[0_2^{+}\right]=1.30$ for $0\nu \beta \beta$decay to its $0_2^{+}$ state.

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• Electromagnetic transitions
• Lifetimes & widths
• Neutrinoless double beta decay
• Nuclear spin & parity
• Photonuclear reactions
• Resonance reactions
• 150 ≤ A ≤ 189
• Collective models