Possibility for precise Weinberg-angle measurement in centrosymmetric crystals with axis

Abstract

We demonstrate that parity-nonconserving interaction due to the nuclear weak charge Q W leads to a nonlinear magnetoelectric effect in centrosymmetric paramagnetic crystals. It is shown that the effect exists only in crystals with special symmetry axis k. Kinematically, the correlation ͑correction to energy͒ has the form H PNC ϰ Q W E · ͓B ϫ k͔͑B · k͒, where B and E are external magnetic and electric fields. This gives rise to the magnetic induction M PNC ϰ Q W ͕k͑B · ͓k ϫ E͔͒ + ͓k ϫ E͔͑B · k͖͒. To be specific, we consider rare-earth-metal trifluorides and, in particular, dysprosium trifluoride which looks the most suitable for experiment. We estimate the optimal temperature for the experiment to be of a few kelvin. For the magnetic field B = 1 T and the electric field E = 10 kV/ cm, the expected magnetic induction is 4M PNC ϳ 0.5ϫ 10 −11 G, six orders of magnitude larger than the best sensitivity currently under discussion. Dysprosium has several stable isotopes, and so comparison of the effects for different isotopes provides the possibility for precise measurement of the Weinberg angle.

Geological Structure of the Zharkent Thermal Groundwater Deposit by the Example of Well 3-T

“…The well flow rate, static level and water temperature were determined. These studies showed that there are no changes in hydrodynamic, hydrochemical and temperature regime of thermal waters in undisturbed conditions over time (Mukhamedjanov et al, 1992).…”

“…3T 1. The purpose of experimental works was to determine the nature of dependence of the well flow rate on water level lowering, to identify hydrogeological parameters, to identify the pattern of changes in the level, flow rate, temperature and water quality over time (Mukhamedjanov et al, 1992).…”