George S, Baruah S, Blank B, Blaum K, Breitenfeldt M, Hager U, Herfurth F, Herlert A, Kellerbauer A, Kluge H-J, Kretzschmar M, Lunney D, Savreux R, Schwarz S, Schweikhard L, Yazidjian C
GSI, Planckstrasse 1, 64291 Darmstadt, Germany.
Phys Rev Lett. 2007 Apr 20;98(16):162501. doi: 10.1103/PhysRevLett.98.162501. Epub 2007 Apr 16.
Ramsey's method of separated oscillatory fields is applied to the excitation of the cyclotron motion of short-lived ions in a Penning trap to improve the precision of their measured mass values. The theoretical description of the extracted ion-cyclotron-resonance line shape is derived and its correctness demonstrated experimentally by measuring the mass of the short-lived 38Ca nuclide with an uncertainty of 1.1 x 10(-8) using the Penning trap mass spectrometer ISOLTRAP at CERN. The mass of the superallowed beta emitter 38Ca contributes for testing the theoretical corrections of the conserved-vector-current hypothesis of the electroweak interaction. It is shown that the Ramsey method applied to Penning trap mass measurements yields a statistical uncertainty similar to that obtained by the conventional technique but 10 times faster. Thus the technique is a new powerful tool for high-precision mass measurements.
拉姆齐分离振荡场方法被应用于彭宁阱中短寿命离子回旋运动的激发，以提高其测量质量值的精度。推导了提取的离子回旋共振线形的理论描述，并通过使用欧洲核子研究中心的彭宁阱质谱仪ISOLTRAP测量短寿命的38Ca核素的质量，其不确定度为1.1×10⁻⁸，实验证明了该理论描述的正确性。超允许β发射体38Ca的质量有助于检验电弱相互作用的守恒矢量流假设的理论修正。结果表明，应用于彭宁阱质量测量的拉姆齐方法产生的统计不确定度与传统技术获得的不确定度相似，但速度快10倍。因此，该技术是高精度质量测量的一种新的有力工具。
