New levels and reinvestigation of octupole correlations in 146,147 La

High spin states of neutron-rich 146,147La have been reinvestigated by \(\gamma\)-\(\gamma\)-\( \gamma\) and \(\gamma\)-\(\gamma\)-\(\gamma\)-\(\gamma\) coincidence data from a 252Cf spontaneous fission experiment by using Gammasphere. Thirty-two new transitions in 146La are observed. Two new bands in 146La have been established. One of them is proposed to be the octupole parity partner of the previously known band. Twenty new transitions in 147La are observed. The ground state band of 147La has been established with a proposed \( 5/2^+\) band-head. Angular correlation of cascades has been used to study the spins and parities of the states. The B(E1)/B(E2) ratios and dipole moments of bands in 146, 147La have been measured.