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arXiv 1305.0952nucl-th
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π介子-核弹性散射、DCX和亚阈共振

Pion-Nucleus Elastic Scattering, DCX and Sub-Threshold Resonances

Mikhail Khankhasayev

摘要:

在正π介子被原子核散射的过程中,双电荷交换(DCX)反应在该反应的阈值附近产生了形成π原子态的可能性。这些准定态可以在弹性散射截面中表现为共振。这些共振的强度和形状受到DCX通道中产生的原子核不稳定性的强烈影响。结果表明,这种机制可以解释在低能正π介子从$^{12}\text{C}$散射中观察到的激发函数的振荡结构。

英文摘要:

In the scattering of positive pions by nuclei the double-charge-exchange (DCX) reaction creates the possibility of formation of pionic atom states in the vicinity of the threshold of this reaction. These quasi stationary states can manifest themselves as resonances in the elastic scattering cross section. The strength and shape of these resonances is strongly affected by an instability of the nucleus created in the DCX channel. It is shown that this mechanism can explain oscillation structures in the excitation function observed in scattering of low-energy positive pions from $^{12}\text{C}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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