论文标题
重离子诱导的单核子转移反应中的多步骤过程
Multi-step processes in heavy-ion induced single-nucleon transfer reactions
论文作者
论文摘要
首先在1970年代首先指出，有限的扭曲波出生的近似（FR-DWBA）计算无法令人满意地描述由重离子引起的许多单蛋白（和一些单个单中性）传递反应的角度分布的形状，与数据相比，大量的计算将较大的角度转移到较大的角度。这些反应表现出显着的不匹配，无论是反应Q值还是入口和出口通道的放牧角动量，并且据推测，通过弹丸和/或喷射的激发状态包含多步传输路径，可以补偿这种不匹配的效果，并通过降低较小的Angles的数据效果，并产生良好的数据描述。但是，迄今为止，对于许多反应，尚未明确证明这一点。在这项工作中，我们表明，在耦合通道诞生的近似计算中，通过4.44-mev 2+激发态包含了12c弹丸的激发状态，可以很好地描述208pb（12C，11B）209BI单蛋白剥离数据，这是在四个入射能量上无法由FR-DWBA描述的四个入射能量。我们还表明，包含208pb（12C，13C）207pb单中性拾音器反应的相似反应路径的影响相对较小，从而略微改善了使用FR-DWBA获得的已经良好的描述。
It was first noted during the 1970s that finite-range distorted wave Born approximation (FR-DWBA) calculations were unable satisfactorily to describe the shape of the angular distributions of many single-proton (and some single-neutron) transfer reactions induced by heavy ions, with calculations shifted to larger angles by up to ~ 4 degrees compared with the data. These reactions exhibited a significant mismatch, either of the reaction Q value or the grazing angular momentum of the entrance and exit channels, and it was speculated that the inclusion of multi-step transfer paths via excited state(s) of the projectile and/or ejectile could compensate for the effect of this mismatch and yield good descriptions of the data by shifting the calculated peaks to smaller angles. However, to date this has not been explicitly demonstrated for many reactions. In this work we show that inclusion of the two-step transfer path via the 4.44-MeV 2+ excited state of the 12C projectile in coupled channel Born approximation calculations enables a good description of the 208Pb(12C,11B)209Bi single-proton stripping data at four incident energies which could not be described by the FR-DWBA. We also show that inclusion of a similar reaction path for the 208Pb(12C,13C)207Pb single-neutron pickup reaction has a relatively minor influence, slightly improving the already good description obtained with the FR-DWBA.
