Kamioka Observatory, Mozumi mine

Assembled from 16 blocks · 1 evidence · 14 related

1. Story
2. An underground neutrino observatory operated by the Institute for Cosmic Ray Research of the University of Tokyo, roughly 1,000 m below Mount Ikeno in the Mozumi mine near Hida, Gifu Prefecture. Its predecessor detector Kamiokande-II recorded part of the neutrino burst from SN 1987A on 23 February 1987 - a handful of interactions in a tank of water that constitute the only direct observation ever made of a stellar core collapsing. The rock overhead is the instrument's essential feature: it absorbs cosmic-ray muons that would otherwise swamp a signal of a few events. The site remains in use for Super-Kamiokande and is the location of the successor experiment now under construction.
3. Knowledge
4. Kamioka Observatory, Mozumi mine
5. SN 1987A: neutrinos from a collapsing core reach Earth
6. Connections
7. SN 1987A: neutrinos from a collapsing core reach Earth
8. SN 1987A: neutrinos from a collapsing core reach Earth
9. Kamioka Observatory, Mozumi mine
10. Supernova
11. Supernova
12. Neutron star
13. Kamioka Observatory, Mozumi mine
14. Initial stellar mass
15. Evidence
16. Records a coincident neutrino burst at approximately 07:35 UT on 23 February 1987 across three detectors, totalling roughly two dozen events. Volume and page numbers are deliberately not asserted because they were not confirmed. Reported event counts differ between accounts: Kamiokande-II is quoted as both 11 and 12 events, with 8 for IMB and 5 for Baksan.