Weighing the antiproton
Weighing the antiproton
复制标题
称量反质子
DOI：
10.1007/s10751-013-0784-y
复制
发表时间：
2013
影响因子：
--
通讯作者：
R.S. Hayano
中科院分区：
文献类型：
--
作者：
H. Nara;T. Yokoshima;T. Momma;T. Osaka;Tohru Fukuyama;R.S. Hayano
反质子氦是一种亚稳态的三体中性原子，由一个反质子、一个氦核和一个电子组成，我们在大约20年前偶然发现了它。反质子在注入物质时通常在几皮秒内湮灭，可以在这个系统中“存储”长达几微秒，并且在这个时间窗口内激光光谱学是可能的。由激光跃迁频率可以精确地计算出反质子与电子的质量比。欧洲核子研究中心的反质子减速器（AD）的最新进展将被讨论。
Antiprotonic helium is a metastable three-body neutral atom consisting of an antiproton, a helium nucleus and an electron, which we serendipitously discovered some 20 years ago. The antiproton, which normally annihilates within a few picoseconds when injected into matter, can be “stored” in this system for up to several microseconds, and laser spectroscopy is possible within this time window. From the laser transition frequency, the antiproton-to-electron mass ratio can be deduced to high precision. Recent progress at CERN’s antiproton decelerator (AD) will be discussed.