Abstract. Variation after projection (VAP) calculations in conjunction with Hartree–Bogoliubov (HB)ansatz have been carried out for ^134–152Sm mass chain. In this framework, the yrast spectra, B(E2) transition probabilities and occupation numbers for various shell model orbits have been obtained. The observed shape transition encountered in going from ¹⁵⁰Sm to ¹⁵²Sm is seen to arise due to enhanced occupation of low k-components of (h_11/2)_π orbit, increased polarization of (d_5/2)_π orbit and increase in the occupation of (i_13/2)_ν and (h_11/2)_ν orbits. The unusual increase in deformation observed in ¹³⁴Sm is found to be due to the filling of (d_3/2)_ν and (h_11/2)_ν orbits to half their capacity.

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