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Fusion reactions near Coulomb barrier; characteristicγ-ray measurements; evaporation residue cross-sections; statistical model; σ _fusion ; average angular momenta

Cross-sections for production of evaporation residues from the compound nucleus⁹⁶Ru* formed by fusion reactions²⁸Si+⁶⁸Zn,³²S+⁶⁴Ni,³⁷Cl+⁵⁹Co and⁴⁵Sc+⁵¹V have been obtained from the yields of their characteristicγ-rays. The measurements span an excitation energy range of 55 MeV to 70 MeV of the compound nucleus. The evaporation residue (ER) cross-sections have been analysed in terms of statistical model for the decay of the compound nucleus. A good agreement is found between statistical model calculation and the experimental evaporation residue cross-sections in all the four cases. It is shown that the average angular momentum$$\bar \ell $$ of the compound nucleus can be deduced from a comparison of the experimentally measured and the statistical model predictions for the ER cross-sections. The validity of this method of deriving$$\bar \ell $$ has been discussed for the case of¹⁶O+¹⁵⁴Sm system.

M Dasgupta¹ A Navin^{1 2} Y K Agarwal¹ C V K Baba¹ H C Jain¹ M L Jhingan¹ A Roy^{1 3}

1. Tata Institute of Fundamental Research, Bombay - 400 005, India
2. Nuclear Physics Division, Bhabha Atomic Research Centre, Bombay - 400 085, India
3. Nuclear Science Centre, JNU New Campus, Post Box No. 10502, New Delhi - 110 067, India

Published

March 1992

Manuscript received

23 October 1991