费米能量下重离子碰撞中向前运动碎片的速度分布

T.I. Mikhailova, B. Erdemchimeg, Yu.M. Sereda
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引用次数: 0

摘要

在费米能量下,重离子诱导的弹丸破碎反应对于研究远离稳定谷、核势的原子核性质,获得已知的核状态方程的知识具有重要意义。远离稳定线的同位素可用于各种应用。因此,高精度地预测同位素的相对产率及其能量是很有意义的。在这里,我们用微观的方法来处理这样的反应,它包括几个步骤:初始化碰撞核的基态,动力学演化直到可以识别初级碎片的冻结点,计算初级碎片的激发能,以及它们的去激发。对于动力学演化,我们使用Boltzmann-Vlasov型输运方程,对于去激励,我们使用统计多碎片描述。我们将此方法应用于弹丸核40Ar在目标9Be上以36.5 A MeV的能量碰撞,获得了产生的同位素分布和速度谱,并将我们的计算结果与JINR的COMBAS装置获得的实验数据进行了比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Velocity distributions of forward moving fragments in heavy-ion collisions at Fermi energies
Heavy-ion-induced projectile fragmentation reactions at Fermi energies are of interest to investigate the properties of nuclei far from the valley of stability, nuclear potentials, to get knew knowledge about nuclear equation of state. Isotopes far from stability line can be useful for various applications. It is therefore of interest to predict relative yields of isotopes and their energies with high precision. Here we treat such reactions in a microscopic approach, which consists of several steps: initialization of ground states of the colliding nuclei, dynamical evolution until the freeze-out point where the primary fragments can be identified, calculation of the excitation energy of the primary fragments, and their de-excitation. For the dynamical evolution we use a Boltzmann–Vlasov type transport equation, and for the de-excitation a statistical multi-fragmentation description. We apply this approach to collisions of projectile nuclei 40Ar on target 9Be at energy 36.5 A MeV, obtain isotope distributions and velocity spectra of the produced isotopes and compare the results of our calculations to experimental data obtained at COMBAS set-up in JINR.
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