Decay properties of states populated with the ²⁰⁷Pb(n,n′ γ) reaction and weak coupling in ²⁰⁷Pb

The properties of states in ²⁰⁷Pb populated with the (n,n′ γ) reaction have been studied. γ-ray excitation functions, angular distributions, and coincidences have been measured, and the lifetimes of many excited states were determined with the Doppler-shift attenuation method. A sextuplet of states near 3.2 MeV is interpreted as resulting from weak-coupling of the vf^-1_5/2 first excited state of ²⁰⁷Pb with the octupole phonon of the ²⁰⁸Pb core. A number of E1 transitions have been identified, and their reduced transition probabilities have been examined. The properties of low-lying levels in ²⁰⁷Pb have been studied in the framework of the particle-core coupling model.