用自旋极化扭秤探测自旋与质量相互作用  

Survey of spin-mass interaction by spin-polarized pendulum

作　　者：范淑华[1] 董瑶[1] 刘琳霞[1] 邵成刚[1] 

机构地区：[1]华中科技大学物理系,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2006年第3期107-110,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10121503)

摘　　要：利用扭秤探测自旋极化物体Sm2Co17与太阳质量之间的类似轴子的相互作用,充磁以后Sm2Co17的等效自旋电子数约为1.5×1023.初步实验结果表明,当相互作用程λ→∞时,自旋质量耦合常数的上限gsgp/(hc)<1.4×10-31.同时给出了对应的洛伦兹与CPT破缺因子的上限在10-17eV水平.为了减小周围环境磁场对实验的影响,设计了三维Helmholtz线圈来补偿背景磁场.并从四个方面讨论了提高实验精度的方法.A torsion balance is a precise instrument for surveying new weak macroscopic forces. A primary experiment with a spin polarized torsion balance was performed to explore a possible axionlike interaction between a spin-polarized body of Sm2Co17 and the sun. After magneti-zation of Sm2Co17, the equivalent number of spin-polarized electrons was about 1.5 ×10^23. A limitation on the coupling constant gcgp/（hc）〈1. 4×10^-31 for interaction range λ→∞ was given. The corresponding limitation on CPT and Lorenz violating parameter was at the level of 10^-17 eV, To further reduce the magnetic interaction, three pairs of Helmholtz coils were made to compensate the surrounding magnetic field. Four constructive proposals were discussed to improve the exoerimental precision.

关 键 词：自旋-质量相互作用 耦合常数 自旋极化扭秤 洛仑兹与CPT对称破缺因子 

分 类 号：O314[理学—一般力学与力学基础]