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Observation of a γ-decaying millisecond isomeric state in <sup>128</sup>Cd<sub>80</sub>
Jungclaus, A.,Grawe, H.,Nishimura, S.,Doornenbal, P.,Lorusso, G.,Simpson, G.S.,Soderstrom, P.A.,Sumikama, T.,Taprogge, J.,Xu, Z.Y.,Baba, H.,Browne, F.,Fukuda, N.,Gernhauser, R.,Gey, G.,Inabe, N.,Isobe North-Holland Pub. Co 2017 Physics letters. Section B Vol.772 No.-
A new high-spin isomer in the neutron-rich nucleus <SUP>128</SUP>Cd was populated in the projectile fission of a <SUP>238</SUP>U beam at the Radioactive Isotope Beam Factory at RIKEN. A half-life of T<SUB>½</SUB>=6.3(8) ms was measured for the new state which was tentatively assigned a spin/parity of (15<SUP>-</SUP>). The experimental results are compared to shell model calculations performed using state-of-the-art realistic effective interactions and to the neighbouring nucleus <SUP>129</SUP>Cd. In the present experiment no evidence was found for the decay of a 18<SUP>+</SUP>E6 spin-trap isomer, based on the complete alignment of the two-neutron and two-proton holes in the 0h<SUB>1½</SUB> and the 0g<SUB>9/2</SUB> orbit, respectively, which is predicted to exist by the shell model.