Vol. 53, No. 3
September 1999
pp. 535-539

Measurement of the ground state 2 n pickup probability for ²⁸ Si + ⁶⁸Zn and its role in sub-barrier fusion enhancement

VANDANA TRIPATHI ¹ ,LAGY T BABY ¹ , P V MADHUSUDHANA RAO ² ,S K HUI ³ , R SINGH ⁴ , J J DAS ¹ , P SUGATHAN ¹ ,N MADHAVAN ¹ and A K SINHA 1

¹Nuclear Science Centre, P.B. No. 10502, New Delhi 110 067, India
²Department of Nuclear Physics, Andhra University, Visakhapatnam 530 003, India
³Department of Physics, Calcutta University, Calcutta 700 009, India
⁴Department of Physics, Delhi University, New Delhi 110 007, India

Abstract.

The ground state and excited state transfer yields for the 2-neutron pickup channel in the ²⁸ Si + ⁶⁸ Zn system have been measured explicitly. The recoil mass separator at the Nuclear Science Centre, New Delhi was used for the measurement. A NaI(Tl) detector was used for detecting the de-excitation g 's from the transfer products. The kinematic coincidence technique was employed for the transfer measurement. Simplified coupled channels calculations show that out of all transfer channels the major contribution to the sub-barrier enhancement comes from the ground state 2 neutron pickup channel with a ground state Q-value of + 1.83 MeV.

Keywords. Heavy-ion fusion; sub-barrier enhancement; ground state transfer; kinematic coinci-dence; simplified coupled channel calculation.

PACS Nos 25.70.Hi; 25.70.Jj

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