Hindrance of O16+Pb208 fusion at extreme sub-barrier energies

Henning Esbensen and Şerban Mişicu
Phys. Rev. C 76, 054609 – Published 26 November 2007

Abstract

We analyze the fusion data for O16+Pb208 using coupled-channels calculations. We include couplings to the low-lying surface excitations of the projectile and target and study the effect of the (O16,O17) one-neutron pickup. The hindrance of the fusion data that is observed at energies far below the Coulomb barrier cannot be explained by a conventional ion-ion potential and defining the fusion in terms of ingoing-wave boundary conditions (IWBC). We show that the hindrance can be explained fairly well by applying the M3Y double-folding potential which has been corrected with a calibrated, repulsive term that simulates the effect of nuclear incompressibility. We show that the coupling to one-neutron transfer channels plays a crucial role in improving the fit to the data. The best fit is achieved by increasing the transfer strength by 25% relative to the strength that is required to reproduce the one-neutron transfer data. The larger strength is not unrealistic because the calculated inelastic plus transfer cross section is in good agreement with the measured quasielastic cross section. We finally discuss the problem of reproducing the fusion data at energies far above the Coulomb barrier. Here we do not account for the data when we apply the IWBC but the discrepancy is essentially eliminated by applying the M3Y+repulsion potential and a weak, short-ranged imaginary potential.

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  • Received 1 August 2007

DOI:https://doi.org/10.1103/PhysRevC.76.054609

©2007 American Physical Society

Authors & Affiliations

Henning Esbensen

  • Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

Şerban Mişicu

  • National Institute for Nuclear Physics, Bucharest, P. O. Box MG6, Romania

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Issue

Vol. 76, Iss. 5 — November 2007

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