Particles from Space Test New Muon Detection System

Dec 14, 2006
Particles from Space Test New Muon Detection System
A 'wires view' of a muon tracked by BaBar's new identification system. Credit: SLAC

The newly installed muon identification system in the BaBar detector is working beautifully. Taking advantage of naturally occurring cosmic rays, the BaBar team has been testing the new detection system in preparation for the January start-up.

Earthly cosmic rays come mostly from protons in outer space. When the protons hit the air in our upper atmosphere, the interactions produce a shower of particles, many of which decay to muons that live long enough to reach the Earth's surface and the BaBar detector.

As the image at right shows, the new Limited Streamer Tubes (LSTs) are tracking muons in the outer, hexagonal-shaped layer of the detector. LSTs replaced the original muon system in two of the hexagon's six sextants in 2004. Crews upgraded the remaining four sextants during the current shut-down.

"The straightness of the measured muon track and the lack of missing hits along it indicate that the detectors are working well and have been connected properly," said LST co-commissioner Mark Convery. Co-commissioner Gianluigi Cibinetto notes that the lack of spurious hits in the detector promises a clean identification environment for muons for the rest of the experiment.

See more images here.

Source: by Heather Rock Woods, SLAC

Explore further: The unifying framework of symmetry reveals properties of a broad range of physical systems

add to favorites email to friend print save as pdf

Related Stories

Recommended for you

What time is it in the universe?

Aug 29, 2014

Flavor Flav knows what time it is. At least he does for Flavor Flav. Even with all his moving and accelerating, with the planet, the solar system, getting on planes, taking elevators, and perhaps even some ...

Watching the structure of glass under pressure

Aug 28, 2014

Glass has many applications that call for different properties, such as resistance to thermal shock or to chemically harsh environments. Glassmakers commonly use additives such as boron oxide to tweak these ...

Inter-dependent networks stress test

Aug 28, 2014

Energy production systems are good examples of complex systems. Their infrastructure equipment requires ancillary sub-systems structured like a network—including water for cooling, transport to supply fuel, and ICT systems ...

Explainer: How does our sun shine?

Aug 28, 2014

What makes our sun shine has been a mystery for most of human history. Given our sun is a star and stars are suns, explaining the source of the sun's energy would help us understand why stars shine. ...

User comments : 0