Dynamic effects of breakup on fusion reactions of weakly bound nuclei

被引:220
作者
Canto, L. F. [2 ]
Gomes, P. R. S. [1 ]
Lubian, J. [1 ]
Chamon, L. C. [3 ]
Crema, E. [3 ]
机构
[1] Univ Fed Fluminense, Inst Fis, BR-24210340 Niteroi, RJ, Brazil
[2] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, Brazil
[3] Univ Sao Paulo, Inst Fis, BR-05389970 Sao Paulo, Brazil
基金
巴西圣保罗研究基金会;
关键词
Unstable beams; Elastic scattering; Fusion; Breakup; RADIOACTIVE ION-BEAMS; CROSS-SECTION; COULOMB BARRIER; NEAR-BARRIER; ENERGIES; LI-11; HE-6; DISTRIBUTIONS; SCATTERING; HALO;
D O I
10.1016/j.nuclphysa.2009.02.001
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The traditional reduction methods to represent the fusion cross sections of different systems are flawed when attempting to completely eliminate the geometrical aspects, such as the heights and radii of the barriers, and the static effects associated with the excess neutrons or protons in weakly bound nuclei. We remedy this by introducing a new dimensionless universal function, which allows the separation and disentanglement of the static and dynamic aspects of the breakup coupling effects connected with the excess nucleons. Applying this new reduction procedure to fusion data of several weakly bound systems, we find a systematic suppression of complete fusion above the Coulomb barrier and enhancement below it. Different behaviors are found for the total fusion cross sections. They are appreciably suppressed in collisions of neutron-halo nuclei, while they are practically not affected by the breakup coupling in cases of stable weakly bound nuclei. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:51 / 71
页数:21
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