$^{193}$Ir($^{12}$C, x)$^{205}$Bi反应在$E_{lab}$≈5-7 AMeV时的不完全融合
Incomplete fusion in $^{193}$Ir($^{12}$C, x)$^{205}$Bi reaction at $E_{lab}$ $\approx$ 5-7 AMeV
AI总结：
研究了$^{193}$Ir($^{12}$C, x)$^{205}$Bi反应在5-7 AMeV能量下的不完全融合现象，发现其分数随能量和入射通道参数增加，且弹体结构对融合过程有关键影响。
摘要：
低能重离子诱导反应往往涉及不完全融合，但ICF对各种入射通道参数的依赖性仍然不明确。在本工作中，我们使用堆叠箔激活技术结合离线γ谱学，测量了在$^{12}$C+$^{193}$Ir系统中通过完全和/或不完全融合产生不同蒸发残余的各通道产额。实验测得的激发函数在统计模型代码PACE4框架下，使用不同的能级密度参数（a = A/9-A/15 MeV⁻¹）进行了分析。在分析激发函数时，xn和pxn通道（在修正其前驱贡献后）能够很好地用a = A/13 MeV⁻¹解释；然而，几乎所有α发射通道都显示出比PACE4预测显著增强，这归因于不完全融合。不完全融合分数（F_ICF）从64 MeV时的12%线性增加到84 MeV时的18%。为了更好地理解ICF的起始和强度，研究了F_ICF作为不同入射通道参数函数的变化，发现其随着质量不对称性、库仑因子和中子皮肤厚度而增加。进一步的数据分析表明，ICF在临界角动量（ℓ<ℓ_crit）以下开始。发现弹体碎裂驱动的不完全融合会抑制完全融合，分别比通用融合函数和改进的融合函数减少约12%和6%。这些发现突显了在5-7 AMeV能量下弹体结构的关键作用，对高自旋光谱学和反应建模有影响。
英文摘要：
Low-energy heavy-ion induced reactions often involve incomplete fusion, but the dependence of ICF on various entrance-channel parameters remains unclear. In this work, we measure channel-by-channel production cross-sections of different evaporation residues populated via complete and/or incomplete fusion in $^{12}$C+$^{193}$Ir system at $E_{lab}$ $\approx$ 64--84 MeV ($\approx$ 5--7 AMeV) using the stacked-foil activation technique followed by offline $γ$-spectroscopy. Experimentally measured excitation functions have been analyzed in the framework of the statistical model code PACE4 using different values of the level-density parameter ($a$ = A/9-A/15 MeV${^{-1}}$). In the analysis of excitation functions, the $xn$ and $pxn$ channels (after correcting with their precursor contributions) have been explained fairly well with $a$ = A/13 MeV${^{-1}}$; however, almost all $α$-emitting channels showed substantial enhancement over PACE4 predictions, which has been attributed to incomplete fusion. The incomplete fusion fraction ($F_{ICF}$) increases linearly with energy from 12\% to 18\% at 64 and 84 MeV, respectively. For better insights into the onset and strength of ICF, the variations of $F_{ICF}$ have been studied as a function of different entrance-channel parameters, which are found to increase with mass asymmetry, Coulomb factor, and neutron skin thickness. Further analysis of the data suggests the onset of ICF below the critical angular momentum ($\ell<\ell_{crit}$). Projectile breakup-driven incomplete fusion is found to suppress complete fusion by $\approx12\%$ and $\approx6\%$ w.r.t. the universal fusion function and the improved fusion function, respectively. These findings highlight the critical role of projectile structure at 5--7 AMeV energies, with implications for high-spin spectroscopy and reaction modeling.
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