Bobby的个人博客分享 http://blog.sciencenet.cn/u/Bobby

博文

为什么测量这个微小旋转粒子如此重要?

已有 368 次阅读 2018-2-13 19:13 |个人分类:科学感想|系统分类:博客资讯

为什么测量这个微小旋转粒子如此重要?


On Tuesday (Feb. 6), a collaboration of 190 scientists operating at Fermi National Accelerator Laboratory in Illinois began using an array of magnets arranged in a ring 50 feet (15 meters) in diameter to make one of the most precise measurements ever performed. In this research, called the g-2 experiment (pronounced "g minus 2"), or just g-2 for short, scientists will measure what is called the anomalous magnetic moment of the rare subatomic particle called a muon, which is a heavy cousin of the electron and spins sort of like a top. The muon, however, exists for only 2.2 millionths of a second when at rest.

The magnetic moment, essentially a measurement of the strength of the magnet created by each muon, has been both measured and calculated to a precision of one part in 1012. That's like measuring the distance between the Earth and sun with a precision of a millimeter. Currently, the prediction and measurement do not agree, and this discrepancy might be the first hints of physics beyond the Standard Model, which is our current theory describing the subatomic world.


Why Measuring a Tiny, Spinning Particle Is Such a Big Deal

https://www.space.com/39664-muon-magnetic-moment.html




http://blog.sciencenet.cn/blog-39731-1099735.html

上一篇:研究表明饮食和抑郁之间存在生物学联系
下一篇:读读阿兰·德波顿(Alain de Botton)的书

0

该博文允许注册用户评论 请点击登录 评论 (0 个评论)

数据加载中...

Archiver|手机版|科学网 ( 京ICP备14006957 )

GMT+8, 2018-5-20 23:42

Powered by ScienceNet.cn

Copyright © 2007-2017 中国科学报社

返回顶部