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Prog. Theor. Phys. Supplement No.154 (2004) pp. 209-216

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The Nuclear Potential in Heavy-Ion Fusion

M. Dasgupta,1 D. J. Hinde,1 J. O. Newton1 and K. Hagino2

1Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia
2Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan

Abstract:

Fits to high precision fusion cross-sections even for ZPZT < 1000 appear to need a value of the diffuseness parameter a of the Woods-Saxon potential of \simeq1 fm, which is much larger than the commonly accepted value of \simeq 0.65 fm. However, use of large values of a necessarily makes the potential pocket very shallow for realistic values of the nuclear potential depth. For larger values of angular momenta the pocket disappears, and a fusion barrier energy or radius can no longer be defined. In the absence of a potential pocket, fusion does not occur in the commonly used realistic coupled channels code CCFULL where fusion is calculated by applying an incoming wave boundary condition at the position of the minimum of the attractive pocket. For this reason, realistic coupled channels calculations with large values of a have needed unrealistically deep nuclear potentials. Once the potential depth is constrained to reasonable values, the data cannot be explained by simply changing the diffuseness of the nuclear potential. This indicates the necessity to go beyond the potential model, and incorporate dynamical effects as the two nuclei move towards fusion, even for light systems with ZPZT < 1000.


URL : http://ptp.ipap.jp/link?PTPS/154/209/
DOI : 10.1143/PTPS.154.209

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Citing Article(s) :

  1. Progress of Theoretical Physics Supplement No.154 (2004) pp. 31-36 :
    Subbarrier Fusion and Barrier Distributions of 48Ca+90,96Zr
    F. Scarlassara, G. Montagnoli, S. Beghini, R. Silvestri, A. M. Stefanini, L. Corradi, B. R. Behera, E. Fioretto, S. Szilner, M. Trotta, Y. W. Wu, Z. H. Liu, M. Ruan, F. Yang and H. Q. Zhang
  2. Progress of Theoretical Physics Supplement No.154 (2004) pp. 465-472 :
    FUSION03, Concluding Remarks
    A. B. Balantekin

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