9 ms·
It's worth noting that we received the neutrinos from Supernova 1987a before the photons. We think that's because the photons have a difficult time escaping the
by queuebert 2y ago
It's worth noting that we received the neutrinos from Supernova 1987a before the photons. We think that's because the photons have a difficult time escaping the ejecta cloud, while neutrinos stream away freely, but who knows ...
- PaulHoule 2y agoOddly another detector caught a burst of low energy neutrinos that came a few hours before the burst that everyone accepts was from 1987a https://www.sciencedirect.com/science/article/pii/S0927650512001843 https://www.sciencedirect.com/science/article/pii/S092765051... Low energy tachyons would go a little faster, but you've got the additional problem of explaining why neutrinos got emitted in a spectral line.
- queuebert 2y agoThat is weird. Is the conventional explanation a flash from one of the last fusion stages right before core collapse?
- PaulHoule 2y agoThe core collapse itself produces most of the neutrinos. All of these protons are squeezed together with electrons which produces neutrons and neutrinos.
- queuebert 2y agoI was referring to the earlier monoenergetic flash. Yes, most should be produced through electron capture in the collapse, but for earlier event to be monoenergetic suggests a specific nuclear process to me.