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Probing of complete and incomplete fusion dynamics in heavy-ion collision

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Abstract

Three different types of experiments have been performed to explore the complete and incomplete fusion dynamics in heavy-ion collisions. In this respect, first experiment for the measurement of excitation functions of the evaporation residues produced in the 20Ne + 165Ho system at projectile energy ranges ≈2–8 MeV /nucleon has been done. Measured cumulative and direct cross-sections have been compared with the theoretical model code PACE-2, which takes into account only the complete fusion process. It has been observed that, incomplete fusion fraction is sensitively dependent on projectile energy and mass asymmetry between the projectile and the target systems. Second experiment for measuring the forward recoil range distributions of the evaporation residues produced in the 20Ne + 165Ho system at projectile energy ≈8 MeV /nucleon has been done. It has been observed that, some evaporation residues have shown additional peaks in the measured forwardrecoil range distributions at cumulative thicknesses relatively smaller than the expected range of the residues produced via complete fusion. The results indicate the occurrence of incomplete fusion involving the breakup of 20Ne into 4He + 16O and /or 8Be + 12C followed by one of the fragments with target nucleus 165Ho. Third experiment for the measurement of spin distribution of the evaporation residues produced in the 16O + 124Sn system at projectile energy ≈6 MeV /nucleon, showed that the residues produced as incomplete fusion products associated with fast α and 2 α-emission channels observed in the forward cone, are found to be distinctly different from those of the residues produced as complete fusion products. The spin distribution of the evaporation residues also inferred that in incomplete fusion reaction channels input angular momentum (J 0) increases with fusion incompleteness when compared to complete fusion reaction channels. Present observation clearly shows that the production of fast forward α-particles arises from relatively larger angular momentum in the entrance channel leading to peripheral collision.

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Acknowledgements

The authors are grateful to the Directors of VECC, Kolkata and IUAC, New Delhi, for providing experimental facilities to carry out these experiments. The authors are thankful to the operational staff of Cyclotron, VECC, Kolkata and Pelletron, IUAC, New Delhi, for providing necessary facilities and good cooperation during the course of these experiments. The authors are also thankful to the Chairman, Department of Physics, AMU, Aligarh, India, for providing necessary facilities related with this research work. D Singh acknowledges encouragement from the Vice-Chancellor of Central University of Jharkhand (CUJ), Ranchi, India. D Singh is thankful to the Head, Department of Applied Physics, CUJ, Ranchi, India, for providing the required facilities. D Singh is also thankful to the Department of Science and Technology (DST), New Delhi for providing financial support in the form of Fast-Track Project No. SR/FTP/PS-005/2011 for Young Scientist during this research work.

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Authors and Affiliations

  1. Centre for Applied Physics, Central University of Jharkhand, Ranchi, 835 205, India

    D SINGH

  2. Department of Physics, G.F. (P.G.) College, Shahjahanpur, 242 001, India

    RAHBAR ALI

  3. Department of Physics, Aligarh Muslim University, Aligarh, 202 002, India

    M AFZAL ANSARI

  4. Radio-chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India

    B S TOMAR

  5. Variable Energy Cyclotron Centre, 1 /AF, Bidhan Nagar, Kolkata, 700 064, India

    M H RASHID, R GUIN & S K DAS

  6. Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi, 110 067, India

    R KUMAR, R P SINGH, S MURALITHAR & R K BHOWMIK

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  1. D SINGH
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  2. RAHBAR ALI
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  3. M AFZAL ANSARI
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  9. R P SINGH
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  10. S MURALITHAR
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Correspondence to D SINGH.

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SINGH, D., ALI, R., ANSARI, M.A. et al. Probing of complete and incomplete fusion dynamics in heavy-ion collision. Pramana - J Phys 82, 683–696 (2014). https://doi.org/10.1007/s12043-014-0720-y

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  • DOI: https://doi.org/10.1007/s12043-014-0720-y

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