Nuclear Okorokov effect of heavy ions with relativistic energy

在内部水平上，有一个可能的渠道，因为一个水晶的周期潜力。它被称为共振相干激发（PCE）。核水平中RCE的条件得到了HIMAC提供的相对重离子的满足。在相对能量区域中，一个通道实验需要一个极高的小角度分化的光束。我们已经开发了平行光束，并观察到了减少能源沉积和在几种渠道条件下的角度分布的通道。在若干通道条件下的通道中，我们成功地观察了原子RCE从1到n=2个状态的原子RCE，具有390 MeV/u Ar^<17+> ions在硅晶体中通道中，通过测量晶体后的电荷状态分布。在多种RCE条件下，存活Ar的部分^<17+>被观察到可以减少的。我们还对通道元件的能量沉积进行了测量，将其作为一个目标晶体，采用完全废弃的硅探测器。“计划通道离子的能量沉积与晶体中的轨迹密切相关，并提供了位置依赖晶体场的信息。”该共振概况很好地解释了L.S.的相互作用和在水晶场产生的星形效应。

Channeling ions have a possibility to be excited in the internal levels by a periodic potential of a crystal. It is called Resonant Coherent Excitation (PCE). The condition of RCE in nuclear levels is satisfied with relativistic heavy ions supplied by HIMAC.A channeling experiment in a relativistic energy region requires a beam with extremely small angular divergence. We have developed a parallel beam, and observed the reductions of the energy deposition and the angular spread of channeling ions under several channeling conditions. channeling ions under several channeling conditions.We have succeeded in observing the atomic RCE from 1s to n=2 states with 390MeV/u Ar^<17+> ions planar channeled in a Si crystal, by measuring the charge state distribution after transmission through the crystal. Under several RCE conditions, the fraction of survived Ar^<17+> ions was observed to decrease drastically. We also measured the energy deposition of channeling ions adopting a totally depleted silicon detector as a target crystal. The energy deposition of the plannar channeling ion is closely related to the trajectory in the crystal, and provides the information of the position dependent crystal field. The resonance profiles are well explained by the L・S interaction and the Stark effect originated in the crystal field.