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arXiv 0904.0914nucl-th
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准自由条件下单质子和双质子敲除反应的密度依赖性

On the density dependence of single-proton and two-proton knockout reactions under quasifree conditions

Wim Cosyn, Jan Ryckebusch

摘要:

我们认为高能量准自由的单和两个质子敲除反应引起的电子和质子,并解决这个问题,什么样的目标核密度可以有效地探测核衰减校正后(初始和最终状态的相互作用)。我们的计算涉及1.5 GeV的质子动能,反应(e,e 'p),(γ,pp)和(p,2 p)和碳靶。结果表明,这三个反应的特点是由一个独特的灵敏度的目标核的密度。(γ,pp)强度的主要来源于深核内部的高密度区。尽管有很强的衰减,但只要能量分辨率允许从s轨道拾取核子,(p,2 p)就可以探测到相当大的密度。在高能(e,e 'p)中可以探测到的有效平均密度是核饱和密度的30-50%。

英文摘要:

We consider high-energy quasifree single- and two-proton knockout reactions induced by electrons and protons and address the question what target-nucleus densities can be effectively probed after correcting for nuclear attenuation (initial- and final-state interactions). Our calculations refer to ejected proton kinetic energies of 1.5 GeV, the reactions (e,e'p), (γ,pp) and (p,2p) and a carbon target. It is shown that each of the three reactions is characterized by a distinctive sensitivity to the density of the target nucleus. The bulk of the (γ,pp) strength stems from the high-density regions in the deep nuclear interior. Despite the strong attenuation, sizable densities can be probed by (p,2p) provided that the energy resolution allows one to pick nucleons from s orbits. The effective mean densities that can be probed in high-energy (e,e'p) are of the order of 30-50% of the nuclear saturation density.

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