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arXiv 2007.13370nucl-exnucl-th
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重离子诱发单核子转移反应中的多步过程

Multi-step processes in heavy-ion induced single-nucleon transfer reactions

N. Keeley, K. W. Kemper, K. Rusek

摘要:

在20世纪70年代,人们首次注意到有限程扭曲波玻恩近似(FR-DWBA)计算无法令人满意地描述重离子引起的许多单质子(和一些单中子)转移反应的角分布形状,与数据相比,计算向更大的角度偏移了约4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掠射角动量,并且据推测,通过抛射体和/或喷射物的激发态包含多步转移路径可以补偿这种不匹配的影响,并通过将计算的峰移动到更小的角度来获得对数据的良好描述。然而,迄今为止,这还没有明确证明许多反应。在这项工作中,我们表明,包括通过4.44-MeV的2+激发态的12 C弹丸在耦合通道玻恩近似计算的两步转移路径,使一个很好的描述208 Pb(12 C,11 B)209 Bi单质子剥离数据在四个入射能量,不能描述的FR-DWBA。我们还表明,包含一个类似的反应路径的208 Pb(12 C,13 C)207 Pb单中子拾取反应有一个相对较小的影响,略有改善已经很好的描述与FR-DWBA。

英文摘要:

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.

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