Sensitivity of4values extracted from quasi elastic barrier distribution to the 2n transfer channel

In recent times, the Fusion Barrier Distributions(FBD) determined from quasi-elastic scattering measurements have been employed to determine the hexadecapole deformation parameter beta(4)value precisely. In reactions where transfer channels are favourable, coupling due to transfer may affect the determination of beta(4). In order to study the role of transfer channels while determining beta 4from barrier distribution, the quasi-elastic scattering measurements have been carried out in(16)O+Yb-176. Quasi-elastic scattering excitation function has been measured at backward angles with respect to the beam direction and barrier distribution D-qel(E)has been derived. Experimentally obtained barrier distribution has been compared with coupled channel calculations using CCFULL code. The effect of two neutron transfer and hexadecapole deformation has been studied using coupled channel calculation.chi(2)was calculated in a two dimensional space of beta(4) and neutron transfer strength P-tr. Without considering neutron transfer,chi 2minimization of Dqel(E) was not possible and the best-fit was found over a small range of beta(4)andPtr.AtPtr=0.37, corresponding to minimum chi(2),the beta(4)of(176)Yb is determined to be 0.00 +/- 0.015. This value of beta 4 is in agreement with that obtained from Coulomb excitation measurement.