What are types of cloud chamber?
Admin
There are several major types of cloud chamber and related particle-track detectors. They all work by making charged particles visible as trails. 1. Diffusion cloud chamber This is the most…
Radio Astronomy
When a muon travels through our atmosphere, what is the chance that it will interact with something in the atmosphere?
A muon passing through the atmosphere is very likely to interact many times electromagnetically, but very unlikely to undergo a major nuclear interaction or be stopped outright. The key point…
Are muons charged?
Yes — muons are electrically charged particles. A muon is similar to an electron but much heavier (about 207 times the electron’s mass). There are two types: The elementary charge…
Calculating attenuation of muons in lead – ASCII text version
1. Basic physics Cosmic-ray muons at ground level: Approximate stopping power in lead: dE/dx ≈ 1.5 to 2 MeV g^-1 cm^2 Lead density: rho_Pb ≈ 11.34 g/cm^3 So energy loss…
How to calculate a table showing attenuation of muons by lead thickness, and analysing the results I have obtained at LRO with difference quantities of lead between two CosmicWatch muon detectors in coincidence arrangement 17/5/2026
The following has come from ChatGPT. (An ASCII text version of this post is available for people who have difficulty reading this page at https://www.astronomy.me.uk/calulat8ng-attenuation-of-muons-in-lead-ascii-text-version) Assessing the results from LRO…
LRO Experiment to test effect of placing various amounts of lead between two x UKRAA CosmicWatch Muon Detectors in coincidence mode 16-17 May 2026
This experiment was suggested to me at the last SARA online meeting. Here are the results – I started with zero and build up to 5, and to confirm went…
An X-Band feed has been installed on the 20m Skynet dish at Greenbank Observatory May 2026. What can we observe with it?
An X-Band feed has been installed on the 20m Skynet dish at Greenbank Observatory May 2026. What can we observe with it? Dimitry UA3AVR sent 14 May 2026: X-band on…
Does painting the dish with Hammerite (trade name) metal-protective paint affect performance?
At 1420 MHz (λ ≈ 21 cm, the Hydrogen line), painting a steel dish with Hammerite (or similar metal paint) makes essentially no meaningful difference to RF performance, as long…
How well does a steel dish work at 1420 MHz?
At 1420 MHz (the hydrogen line at 21 cm wavelength Hydrogen line), a steel dish performs essentially as well as any other good conductor—provided the geometry and surface quality are…
Plots of data collected using Brian Coleman’s self-made hydrogen-line feed placed at correct (I think…but maybe not?) focal point on the LRO-H2 telescope (150cm Solar Cooker Radio Telescope) & pointed towards either outer Milky Way (1 spiral arm seen) or inner Milky Way (2 spiral arms seen) 16 May 2026
Lichfield Radio Observatory, UK. Azimuth 168 degrees. Elevation 75 degrees. I have tested various distances of the feed from the centre of the dish over several weeks and concluded that…