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从原子核物理学观点出发，采用理论分析与实验测量并举的方法对超级能（＜２００ｋｅｖ）重离子（Ｚ≥６）注入作物（小麦）种子进行诱变育种的原初物理机制进行了研究。结果表明：无论是注入离子本身的射程，还是次级电子、自由基扩散、高温热穗、级联原子和冲击波等次级作用范围都无法触及表皮下面的胚细胞。但注入离子在麦胚内主要元素（Ｃ、Ｎ、Ｏ、Ｓ、Ｐ、Ｋ、Ｃａ）上激发出的特征Ｘ─射线，在其强度减弱为原来的１０－３时，深入深度可达１０—５００μｍ范围，并通过同步辐射碳光模拟的生物学效应研究，证实这种特征Ｘ─射线是超低能离子注入诱变育种的一种重要机制。
From the viewpoint of nuclear physics, the primary physical mechanism of mutagenesis breeding of crops (wheat) injected with super energy (<200kev) heavy ions (Z≥6) was studied by theoretical analysis and experimental measurement. The results show that neither the secondary ions, secondary electrons, free radical diffusion, hyperthermic spike, cascade atoms and shock wave can reach the subdermal epithelial cells. However, the characteristic X-ray excited by ion implanted on the main elements (C, N, O, S, P, K, Ca) in wheat germ can reach a depth of 10 -500μm, and through the biological effects of synchrotron carbon simulation, it is proved that this characteristic X-ray is an important mechanism of ultra-low energy ion implantation mutation breeding.