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Energy dependence of nucleus-nucleus potential close to the Coulomb barrier

Abstract : The nucleus-nucleus interaction potentials in heavy-ion fusion reactions are extracted from the microscopic time-dependent Hartree-Fock theory for mass symmetric reactions $^{16}$O${}+^{16}$O, $^{40}$Ca${}+^{40}$Ca, $^{48}$Ca${}+^{48}$Ca and mass asymmetric reactions $^{16}$O$ +^{40,48}$Ca, $^{40}$Ca${}+^{48}$Ca, $^{16}$O+$^{208}$Pb, $^{40}$Ca+$^{90}$Zr. When the center-of-mass energy is much higher than the Coulomb barrier energy, potentials deduced with the microscopic theory identify with the frozen density approximation. As the center-of-mass energy decreases and approaches the Coulomb barrier, potentials become energy dependent. This dependence signs dynamical reorganization of internal degrees of freedom and leads to a reduction of the "apparent" barrier felt by the two nuclei during fusion of the order of $2-3 %$ compared to the frozen density case. Several examples illustrate that the potential landscape changes rapidly when the center-of-mass energy is in the vicinity of the Coulomb barrier energy. The energy dependence is expected to have a significant role on fusion around the Coulomb barrier.
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http://hal.in2p3.fr/in2p3-00274331
Contributor : Michel Lion <>
Submitted on : Friday, April 18, 2008 - 10:09:48 AM
Last modification on : Thursday, November 5, 2020 - 10:50:13 AM

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K. Washiyama, Denis Lacroix. Energy dependence of nucleus-nucleus potential close to the Coulomb barrier. Physical Review C, American Physical Society, 2008, 78, pp.024610. ⟨10.1103/PhysRevC.78.024610⟩. ⟨in2p3-00274331⟩

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