BASE – The Baryon Antibaryon Symmetry Experiment
BASE – The Baryon Antibaryon Symmetry Experiment
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DOI：
10.1140/epjst/e2015-02607-4
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发表时间：
2015-11
期刊：
影响因子：
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通讯作者：
C. Smorra;K. Blaum;L. Bojtár;M. Borchert;K. Franke;Takashi Higuchi;N. Leefer;H. Nagahama;Y. Matsuda;A. Mooser;M. Niemann;C. Ospelkaus;C. Ospelkaus;W. Quint;G. Schneider;S. Sellner;T. Tanaka;S. Gorp;J. Walz;Y. Yamazaki;S. Ulmer
中科院分区：
文献类型：
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作者：
C. Smorra;K. Blaum;L. Bojtár;M. Borchert;K. Franke;Takashi Higuchi;N. Leefer;H. Nagahama;Y. Matsuda;A. Mooser;M. Niemann;C. Ospelkaus;C. Ospelkaus;W. Quint;G. Schneider;S. Sellner;T. Tanaka;S. Gorp;J. Walz;Y. Yamazaki;S. Ulmer
重子-反重子对称性实验（BASE）的目的是通过高精度地比较质子和反质子的磁矩，对电荷宇称和时间反演（CPT）的组合对称性进行严格的检验。使用潘宁阱中的单个粒子，通过测量自旋进动频率与回旋频率的相应比率来确定质子/反质子因子，即以核磁子为单位的磁矩。自旋进动频率是通过使用连续Stern-Gerlach效应对自旋量子跃迁进行非破坏性检测来测量的，而回旋频率是使用不变性定理从Penning陷阱中粒子的运动本征频率确定的。通过应用双潘宁阱方法，我们期望在我们的测量中可以达到δg/g10− 9的分数精度。成功地将这种方法应用于反质子，将使其磁矩的分数精度提高1000倍。BASE合作已经在欧洲核子研究中心的反质子减速器（AD）建造并委托进行了一项新的实验。本文描述和总结了这个新实验的物理和技术方面。
The Baryon Antibaryon Symmetry Experiment (BASE) aims at performing a stringent test of the combined charge parity and time reversal (CPT) symmetry by comparing the magnetic moments of the proton and the antiproton with high precision. Using single particles in a Penning trap, the proton/antiprotong-factors, i.e. the magnetic moment in units of the nuclear magneton, are determined by measuring the respective ratio of the spin-precession frequency to the cyclotron frequency. The spin precession frequency is measured by non-destructive detection of spin quantum transitions using the continuous Stern-Gerlach effect, and the cyclotron frequency is determined from the particle*s motional eigenfrequencies in the Penning trap using the invariance theorem. By application of the double Penning-trap method we expect that in our measurements a fractional precision of δg/g10−9can be achieved. The successful application of this method to the antiproton will consist a factor 1000 improvement in the fractional precision of its magnetic moment. The BASE collaboration has constructed and commissioned a new experiment at the Antiproton Decelerator (AD) of CERN. This article describes and summarizes the physical and technical aspects of this new experiment.