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An in space detector is (at least to my understanding) not that easy, as you need the surface of the Earth to interact with the neutrinos. These interactions re
by gpuhacker 8y ago
An in space detector is (at least to my understanding) not that easy, as you need the surface of the Earth to interact with the neutrinos. These interactions result in muons, which allow to detect that there was a neutrino in the first place. Also, there is a pretty big source for neutrinos pretty close to Earth, but Earth is in its orbit, as opposed to the other way around.
- not2b 8y agoThe IceCube neutrino detector consists of about a cubic kilometer of ice. You're not going to put one of those in orbit.
- gpuhacker 8y agoExactly
- logfromblammo 8y agoYou might be able to tow it in from elsewhere using a light sail, however. Beyond our current technology, but might be doable by 2100, or sooner with a fortuitous comet trajectory.
- dotancohen 8y agoAnd once it is in orbit, how do you propose stationkeeping against exospheric drag? Preferably a solution that will remain reliable for 10^n (n>>3) years.
- logfromblammo 8y agoA cubic kilometer of ice is 9.167e11 kg. Also, just keep the orbit above 800km, and the light sail will still be able to counteract its own drag. If the orbit gets too low, turn the ice into rocket fuel and use it to refuel ships boosting into higher orbits.
- dotancohen 8y agoI'm pretty sure that a cubic kilometer of ice in orbit would have more value in other purposes than as a neutrino detector!
- logfromblammo 8y agoSure, but as long as it's up there, might as well use it in every way possible.
- njarboe 8y agoBut it would make a cool joint project for NASA and the NSF to fund. Capture a comet big enough that you could mine enough water to make a cubic kilometer sized detector in Earth orbit.
- BurningFrog 8y agoThat could probably also wipe out half a continent if you mis-aim it... Then again, it would look spectacular in the sky!
- godelski 8y agoThere are other types of neutrino detectors. Not that it really makes the problem any easier to solve, but this isn't the only way.
- phkahler 8y agoThat's what I was thinking. They have sent neutrinos from one lab to another with a man-made source and a detector smaller than 1km^3. The idea is to put a strong source in orbit and aim it at an orbiting detector. Over time this configuration would be used to scan the entire planet. Still a huge challenge.
- godelski 8y agoThat's essentially the main idea most people come to. Using a source so you can concentrate on specific ones and not get distracted by solar, cosmic, or terrestrial neutrinos. Or you could just use terrestrial ones. But still, that detector is the hardest part to figure out.
- cozzyd 8y agoThe muons are produced in the upper atmosphere (from cosmic rays interacting with the atmosphere). You can't do this in space. Not too mention the size of a neutrino detector, although you can use the e.g. regolith of the moon as a neutrino detector (via the Askaryan effect). In fact there are experiments pointing radio telescopes at the moon to look for ultra-high-energy neutrino interactions. My not-so-polite term for them is lunatics :).
- posterboy 8y ago> lunatics Oh you :)