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Capture barrier distributions: Some insights and details

Abstract : The “experimental barrier distribution” provides a parameter-free representation of experimental heavy-ion capture cross sections that highlights the effects of entrance-channel couplings. Its relation to the s-wave transmission is discussed, and in particular it is shown how the full capture cross section can be generated from an $l=0$ coupled-channels calculation. Furthermore, it is shown how this transmission can be simply exploited in calculations of quasifission and evaporation-residue cross sections. The system ^{48}Ca+^{154}Sm is studied in detail. A calculation of the compound-nucleus spin distribution reveals a possible energy dependence of barrier weights due to polarization arising from target and projectile quadrupole phonon states; this effect also gives rise to an entrance-channel “extra-push.”
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Submitted on : Monday, November 12, 2007 - 9:41:19 AM
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N. Rowley, N. Grar, M. Trotta. Capture barrier distributions: Some insights and details. Physical Review C, American Physical Society, 2007, 76, pp.044612. ⟨10.1103/PhysRevC.76.044612⟩. ⟨in2p3-00186452⟩

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