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We have further developed and extended a method for calculation of atomicproperties based on a combination of the configuration interaction andcoupled-cluster approach. We have applied this approach to the calculation ofdifferent properties of atomic lead, including the energy levels, hyperfinestructure constants, electric-dipole transition amplitudes, and E1 paritynonconserving (PNC) amplitude for the (6p^2) ^3P_0 - (6p^2) ^3P_1 transition.The uncertainty of the E1 PNC amplitude was reduced by a factor of two incomparison with the previous most accurate calculation [V.~A.~Dzuba et.al.,Europhys. Lett. 7, 413 (1988)]. Our value for the weak charge Q_W=-117(5) is inagreement with the standard model prediction.

A development of the CI + all-order method and application to the parity-nonconserving amplitude and other properties of Pb