入射通道对不同对碰撞伴子形成的同一复合核退激性质的影响
Effects of entrance channels on the deexcitation properties of the same compound nucleus formed by different pairs of collision partners
摘要：
研究了不同质量（电荷）不对称反应生成的同一个$^{220}$ Th复合核（CN）的去激特性。结果表明，有效裂变势垒$<B_{\rm fis}>$值是激发能$E^*_{\rm CN}$的函数，它对不同入射通道（$^{16}$ O+ $^{204}$ Pb，$^{40}$ Ar+ $^{180}$ Hf，$^{82}$ Se + $^{138}$ Ba和$^{96}$ Zr+ $^{124}$ Sn）在相同激发能$E^*_{CN}$条件下形成的CN的不同轨道角动量$L=\ell\hbar$分布非常敏感.因此，轻粒子（中子，质子和$α$ -粒子）的裂变和蒸发过程之间的竞争取决于CN的轨道角动量分布。因此，仅对于具有给定激发能量$E^*_{CN}$的相同CN，在发射中性和带电粒子和中子之后获得的蒸发残余物横截面之间的比率对入口通道中的反应物的质量（电荷）不对称性敏感。
英文摘要：
The properties of deexcitation of the same $^{220}$Th compound nucleus (CN) formed by different mass (charge) asymmetric reactions are investigated. It is demonstrated that the effective fission barrier $<B_{\rm fis}>$ value being a function of the excitation energy $E^*_{\rm CN}$ is strongly sensitive to the various orbital angular momentum $L=\ell\hbar$ distributions of CN formed with the same excitation energy $E^*_{CN}$ by the very different entrance channels $^{16}$O+$^{204}$Pb, $^{40}$Ar+$^{180}$Hf, $^{82}$Se+$^{138}$Ba and $^{96}$Zr+$^{124}$Sn. Consequently, the competition between the fission and evaporation of light particles (neutron, proton, and $α$-particle) processes along the deexcitation cascade of CN depends on the orbital angular momentum distribution of CN. Therefore, the ratio between the evaporation residue cross sections obtained after emission of neutral and charged particles and neutrons only for the same CN with a given excitation energy $E^*_{CN}$ is sensitive to the mass (charge) asymmetry of reactants in the entrance channel.
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