Abstract
The concept of compound nucleus was proposed by Niels Bohr in 1936 to explain narrow resonances observed in scattering of a slow neutron off atomic nuclei. A compound nucleus is a metastable state with a long lifetime, in which all the degrees of freedom are in a sort of thermal equilibrium. Fusion reactions are defined as reactions to form such compound nucleus by merging two atomic nuclei. Here a short description of heavy-ion fusion reactions at energies close to the Coulomb barrier is presented. This includes (i) an overview of a fusion process, (ii) a strong interplay between nuclear structure and fusion, (iii) fusion and multidimensional/multiparticle quantum tunneling, and (iv) fusion for superheavy elements.
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Notes
- 1.
For a classical penetrability, P(E) = θ(E − Vb), the energy derivative is given by a delta function, dP∕dE = δ(E − Vb).
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Acknowledgements
I thank L. Felipe Canto for his careful reading of the manuscript and useful suggestions. I also thank Tomoya Naito for his help in preparing Fig. 6. This work was supported in part by JSPS KAKENHI Grant Numbers JP19K03861 and JP21H00120.
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Hagino, K. (2022). Sub-Barrier Fusion Reactions. In: Tanihata, I., Toki, H., Kajino, T. (eds) Handbook of Nuclear Physics . Springer, Singapore. https://doi.org/10.1007/978-981-15-8818-1_9-1
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