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PDMATHAAB S+ $^{182,184}$ W反应中聚变- fission与准裂变过程的竞争

Competition between fusion-fission and quasifission processes in the $^{32}$S+$^{182,184}$W reactions

H. Q. Zhang, C. L. Zhang, C. J. Lin, Z. H. Liu, F. Yang, A. K. Nasirov, G. Mandaglio, M. Manganaro, G. Giardina

备注：
28 pages, 13 figures, submitted to Phys. Rev. C
发表信息：
Phys.Rev.C81:034611,2010
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摘要：

测量了质心能量为118.8、123.1、127.3、131.5、135.8、141.1和144.4 MeV的$^{32}$ S+ $^{184}$ W反应的裂变碎片角分布。得到了实验裂变激发函数。通过外推各裂变角分布，得到了碎片角各向异性（$\mathcal{A}_{\rm exp}$）。用双核系统模型将测量的$^{32}$ S+ $^{182,184}$ W反应的裂变截面分解为聚变裂变、准裂变和快裂变的贡献。在先进的统计模型的框架下计算的$^{32}$ S+ $^{184}$ W反应的总蒸发残渣激发函数与现有的实验数据符合良好，直到约$E_{\rm c.m.}\approx 160$ MeV。在所考虑的束能量范围内，用相同的部分俘获截面对反应和表征裂变产物角分布的量$K_0^2$、$<\ell^2>$和$\mathcal{A}_{\rm exp}$的实验俘获激发函数进行了理论描述。

英文摘要：

The angular distributions of fission fragments for the $^{32}$S+$^{184}$W reaction at center-of-mass energies of 118.8, 123.1, 127.3, 131.5, 135.8, 141.1 and 144.4 MeV were measured. The experimental fission excitation function is obtained. The fragment angular anisotropy ($\mathcal{A}_{\rm exp}$) is found by extrapolating the each fission angular distributions. The measured fission cross sections of the $^{32}$S+$^{182,184}$W reaction are decomposed into fusion-fission, quasifission and fast fission contributions by the dinuclear system model. The total evaporation residue excitation function for the $^{32}$S+$^{184}$W reaction calculated in the framework of the advanced statistical model is in good agreement with the available experimental data up to about $E_{\rm c.m.}\approx 160$ MeV. The theoretical descriptions of the experimental capture excitation functions for both reactions and quantities $K_0^2$, $<\ell^2>$ and $\mathcal{A}_{\rm exp}$ which characterize angular distributions of the fission products were performed by the same partial capture cross sections at the considered range of beam energy.

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