Nuclear Structure and Decay Data for A=86 Isobars

Experimental nuclear spectroscopic data are evaluated for 14 known nuclides of mass number A=86 (Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru). Detailed evaluated information is presented for each reaction and decay. Recommended values combining all available data are provided for the spectroscopic properties of each level, γ-ray, and decay radiation. Limited level and gamma information is available for ⁸⁶Ga (ground state and one excited level), ⁸⁶Ge (six levels), and ⁸⁶As (ten excited states), with their respective ${\beta }^{-}$ decays poorly known. Fairly detailed level and gamma data are available for ⁸⁶Se, ⁸⁶Br, ⁸⁶Kr, ⁸⁶Rb, ⁸⁶Sr and ⁸⁶Y nuclei. The decay of ⁸⁶Br to ⁸⁶Kr has recently been studied by gamma spectroscopy (2016Ur04) and by TAGS technique (2017Ri08), the latter suggesting that many additional levels in ⁸⁶Kr exist which have not been detected in high-resolution γ-ray spectroscopy. The γ-ray spectra in 2016Ur04 were valid up to $E\gamma =4\text{MeV}$, whereas the Q(β) value of 7.63 MeV for ⁸⁶Br permits population of high-energy levels. For ⁸⁶Zr, ⁸⁶Nb and ⁸⁶Mo, the data are available for mostly the high-spin states, as the decays of ⁸⁶Nb, ⁸⁶Mo, and ⁸⁶Tc, which could populate low-spin levels, are not known well. For ⁸⁶Tc, only four levels are known from the decay of an isomeric activity in ⁸⁶Tc. In addition, decay of ⁸⁶Tc with g.s. ${\text{J}}^{\pi }=\left(0^{+}\right)$ to 0⁺ g.s. in ⁸⁶Mo could involve superallowed β transition, which has been pursued experimentally in detail. For ⁸⁶Ru only the isotopic identification is established, with its half-life and decay modes unknown. The evaluated data in this work supersede data in earlier ENSDF evaluation of A=86 nuclei by 2015Ne01, where the literature cutoff date was November 30, 2014.