Ground State And Excited State Multinucleon Transfer Channels In Interactions Of Si-28 With Zr-90,Zr-94 In Near Barrier Region

Multinucleon transfer reactions were measured in interactions of Si-28 with Zr-90,Zr-94 at a near barrier energy using recoil mass separator, Heavy Ion Reaction Analyzer (HIRA) at Inter University Accelerator Centre (IUAC), New Delhi. The effects of shell closure, positive Q-value transfer channels on the relative strengths of ground state and excited state transfer in multinucleon transfer processes were investigated. The kinematic coincidence technique was employed to reduce the background. The m/q ambiguity was resolved by time of flight (TOF) technique. Based on the Q-value considerations, it was observed that pickup channels were predominantly of neutron transfer, whereas, stripping channels were mainly of proton transfer. A 14-element BGO array was used to extract the relative strength of excited state transfer. In interactions of Si-28 with Zr-90, it was observed that the ground state and excited states competes for populating all the transfer channels. In reactions of Si-28 with Zr-94, nearly similar behavior was observed except for two-neutron pickup channel, where excited state transfer was dominant and four-neutron pickup channel where ground state transfer was dominant.