Fusion near the Coulomb barrier for the synthesis of heavy and superheavy elements: A theoretical approach |
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Authors: | N?Bhatia Email author" target="_blank">S?S?MalikEmail author A?K?Jain |
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Institution: | (1) Department of Physics, G.N.D. University, 143005 Amritsar, India;(2) Department of Physics, Indian Institute of Technology Roorkee, 247667 Roorkee, India |
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Abstract: | The compound nucleus formation is considered as a two-step process of touching and subsequent tunneling of the projectile
into the target. The deep minima in the potential energy curve are due to shell effects in the experimental binding energies
and give possible target-projectile combinations for the synthesis of heavy and superheavy elements. The asymmetric channels
thus obtained are in remarkable agreement with the known experimental channels. In our model, the colliding partners are first
shown to be captured in the pocket behind the outer (touching) barrier and the composite system so formed finally tunnels
through the inner (fusion) barrier to form the resulting compound nucleus. These calculations reveal the importance of the
fusion barrier, which occur only for the asymmetric target-projectile combinations. The calculated fusion cross-sections show
a reasonable comparison with the observed one-neutron evaporation residue cross-sections. An estimate of the excitation energy
carried by the compound nucleus is also obtained from our model calculations. |
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Keywords: | 24 10 -i Nuclear-reaction models and methods 25 70 Gh Compound nucleus 25 70 Jj Fusion and fusion-fission reactions 25 60 Pj Fusion reactions |
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