Observation of a Possible New Isomer in 175Ir

The neutron deficient nuclide ¹⁷⁵Ir was produced by irradiation of ¹⁴⁶Nd with 210 MeV ³⁵Cl via a fusion-evaporation reaction channel. The reaction products were transported to a low-background location using a helium-jet recoil fast-moving tape-transport system for measurement. The experimental devices and data analysis method are introduced. Based on the decay-curve fitting of the β-delayed γ ray from ¹⁷⁵Ir, realized by the least-square method, a new long-lived isomeric state of ¹⁷⁵Ir is proposed and briefly discussed.