An Improved Neutron Electric Dipole Moment Experiment
M. Kuźniak, I. Altarev, G. Ban, G. Bison, K. Bodek, M. Burghoff, M. Daum, K. Eberhardt, P. Fierlinger, E. Gutsmiedl, G. Hampel, W. Heil, R. Henneck, N. Khomutov… 展开作者
M. Kuźniak, I. Altarev, G. Ban, G. Bison, K. Bodek, M. Burghoff, M. Daum, K. Eberhardt, P. Fierlinger, E. Gutsmiedl, G. Hampel, W. Heil, R. Henneck, N. Khomutov, K. Kirch, St. Kistryn, S. Knappe-Grueneberg, A. Knecht, P. Knowles, J. V. Kratz, T. Lauer, B. Lauss, T. Lefort, A. Mtchedlishvili, O. Naviliat-Cuncic, S. Paul, A. S. Pazgalev, G. Petzold, C. Plonka-Spehr, G. Quéméner, D. Rebreyend, S. Roccia, G. Rogel, T. Sander-Thoemmes, A. Schnabel, N. Severijns, Yu. Sobolev, R. Stoepler, L. Trahms, M. Tur, A. Weis, N. Wiehl, J. Zejma, G. Zsigmond
A new measurement of the neutron EDM, using Ramsey's method of separated oscillatory fields, is in preparation at the new high intensity source of ultra-cold neutrons (UCN) at the Paul Scherrer Institute, Villigen, Switzerland (PSI). The existence of a non-zero nEDM would violate both parity and time reversal symmetry and, given the CPT theorem, might lead to a discovery of new CP violating mechanisms. Already the current upper limit for the nEDM (|d_n|<2.9E-26 e.cm) constrains some extensions of the Standard Model.
The new experiment aims at a two orders of magnitude reduction of the experimental uncertainty, to be achieved mainly by (1) the higher UCN flux provided by the new PSI source, (2) better magnetic field control with improved magnetometry and (3) a double chamber configuration with opposite electric field directions.
The first stage of the experiment will use an upgrade of the RAL/Sussex/ILL group's apparatus (which has produced the current best result) moved from Institut Laue-Langevin to PSI. The final accuracy will be achieved in a further step with a new spectrometer, presently in the design phase.
Comment on "A proposed method for measuring the electric dipole moment of the neutron using acceleration in an electric field gradient and ultracold neutron interferometry"
Detailed discussion of a linear electric field frequency shift (important for next generation) electric dipole moment searches) induced in confined gases by a magnetic field gradient: Implications for electric dipole moment experiments (II)
寻找粒子电偶极矩是寻找标准模型之外的物理的最有前途的途径。许多研究小组正在计划使用各种储存气体进行新一代实验。为了达到目标灵敏度，有必要处理由众所周知的E x v场与磁场梯度的相互作用（通常称为几何相位效应[9，10]）产生的系统误差。这种相互作用在电场中产生线性频移，模仿电火花加工。在这项工作中，我们介绍了一个分析模型的关联函数，它决定了频移的行为[11]，并详细说明它如何取决于实验的操作条件。我们还提出了一种在给定实验条件下直接测量关联函数的方法。
A Proposed Method for Measuring the Electric Dipole Moment of the Neutron Using Acceleration in an Electric-Field Gradient and Ultracold Neutron Interferometry
