A study of the 210mBi(t, α)209Pb reaction

The 210mBi(t, α)209Pb reaction has been measured using an 8 μg/cm2 target of 210mBi in the 9− isomeric state at 0.271 MeV. Thirty-four levels up to about 5 MeV excitation were observed with the bulk of the transition strength comprising two-particle one-hole configurations of the form [ππ−1ν]. The 2g92 and 1i112 single neutron states were excited and their relative spectroscopic strengths provide information about the πν configurations in the 9− target state. Transitions to the 152− states at 1.423 and 3.059 MeV are used to estimate admixtures of the [208Pb(3−) ⊗ g92] particle-plus-core configuration. The gross features of the 210mBi(t, α) spectrum are compared with (t, α) spectra measured from 208Pb and 209Bi. The level densities, summed cross sections and average Q-values are discussed.