Undergrad Are Cosmic Rays Actually Neutrinos?

[swampwiz]

I had thought that cosmic rays were protons, but this NY Times article seems to say that cosmic rays are neutrinos:

https://www.nytimes.com/2021/03/30/science/neutrinos-lake-baikal.html

Using a grid of light detectors similar to the Baikal telescope, IceCube identified a neutrino in 2017 that scientists said almost certainly came from a supermassive black hole. It was the first time that scientists had pinpointed a source of the rain of high-energy particles from space known as cosmic rays ...

 

[PeroK]

The NY Times is unlikely to use strict scientific definitions. And, in any case, "cosmic rays" may be quite loose terminology.

 

[snorkack]

Protons are stopped by atmosphere (and then ground or water). Neutrinos are not. So watching for cosmic rays deep under water shows the neutrinos.

 

[Vanadium 50]

I had thought that cosmic rays were protons

Mostly protons.

 

[hutchphd]

and the NY Times sometimes doesn't do well with physics
https://io9.gizmodo.com/the-greatest-newspaper-correction-ever-written-49-year-1491590487