Level scheme study of Mo92 : Searching for evidence of core excitation

Excited states in 92Mo are populated via the 89Y(6Li, 3n) 92Mo reaction at the tandem of XTU, INFN-LNL. The level scheme of 92Mo is revised and expanded considerably by the γ -γ coincidence measurement. The newly observed level structures are compared with different shell-model calculations performed in various model spaces. The results show that the several high-energy (≈2 MeV) transitions, observed for the first time in the current work, could be a presumable signature of N = 50 core-breaking effect. The measured strengths of E1 transitions between the low-lying positive and negative bands indicate an important contribution from Z = 28 proton core-excitation.