The beta decay of88gNb and88mNb

The level structure of⁸⁸Zr is investigated via the beta decay of^88g Nb and^88m Nb whose half-lives are measured to be 14.4±0.2 m and 7.7±0.1 m, respectively. The decay properties are studied by means of beta and gamma spectroscopy techniques. The level structure of⁸⁸Zr populated in the decays of both isomers is proposed with deducedJ ^π values. Theβ-decay energies for^88g Nb and^88m Nb are measured to be 7.55±0.10 and 7.59±0.10 MeV, respectively. The structure is discussed in terms of the shell model.