Anomalies in the decay rates of antiprotonic helium-atom states
Anomalies in the decay rates of antiprotonic helium-atom states
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反质子氦原子态衰变率的异常
DOI：
10.1103/physreva.66.022504
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发表时间：
2002
影响因子：
2.9
通讯作者：
T. Yamazaki
中科院分区：
文献类型：
--
作者：
H. Yamaguchi;T. Ishikawa;J. Sakaguchi;E. Widmann;J. Eades;R. Hayano;M. Hori;H. Torii;B. Juhász;D. Horvath;T. Yamazaki
在欧洲核子研究中心的反质子减速器（AD）上研究了密度为3×10 2 0 -3×10 2 1 cm - 3 的氦气中反质子氦原子的六次共振跃迁。这些跃迁的子态的衰减率是根据共振尖峰的时间分布或共振线的宽度来确定的。尽管大多数观察到的衰变率与俄歇率的理论计算一致，但发现两种状态（n，l）=（37,33）和（32,31）的衰变率比这些计算预测的要大两个数量级。 Kartavtsev等人指出，与近电子激发态的耦合效应被认为是(37, 33)态异常的原因。 [物理。 Rev. A 61, 062507 (2000)]。
Six resonance transitions of the antiprotonic helium atom in helium gas at densities of 3×10 2 0 -3×10 2 1 cm - 3 were studied at the antiproton decelerator (AD) of CERN. The decay rates of the daughter states of these transitions were determined either from the time distributions of the resonance spikes or from the widths of the resonance lines. Whereas most of the observed decay rates agree with theoretical calculations of Auger rates, two states, (n,l)=(37,33) and (32,31), were found to have decay rates two orders of magnitude larger than predicted by these calculations. The effect of coupling with near-lying electron-excited states is considered to be the reason for the anomaly of the (37, 33) state, as pointed out by Kartavtsev et al. [Phys. Rev. A 61, 062507 (2000)].