# How does one store a muon?

The recent publication in Phys.Rev.Lett. 126, 141801 Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm says that

A fast pulsed-kicker magnet deflects the muon bunch into a 9-cm-diameter storage aperture, resulting in $$\approx 5000$$ stored muons per fill.

Considering that those muons are moving with almost the speed of light ($$\gamma\approx30)$$ and at rest they would only last about $$2.2\ \mu s$$ on average before decaying, catching one would be no mean feat.

What am I missing?

• Very briefly... – tparker Apr 17 at 17:06

As the paper says, the muons are deflected with a magnet into a storage ring, where they are stored for a fraction of a second. The muons are still moving with nearly the speed of light, which extends their average lifetime by a factor of $$\gamma$$.