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- W2163683034 abstract "This comment will focus on the neutrinos from SN 1987A. Experimental groups from IMB, Kamiokanda, Mount Blanc, and Baksan have reported the detection of neutrinos from the supernova in the Large Magellanic Cloud. The pre-supernova star was a massive object, 15-20 Ma which was blue, not red. This comment summarizes how such a star can explode and produce neutrinos. Not only did this detection establish extra-solar system neutrino astronomy, but it also constrained the properties of neutrinos. The model-independent constraints on neutrino properties are presented, as well as those conclusions which are more dependent on the details of the supernova model. Specifically, it is argued that 7~s~ > 1.6 x lo5 yr, that me. < 30 eV, and that the number of neutrino families, N, 5 7 and that sxions are severely constrained. These limits can be tightened if assumptions are made about the expected nature of the neutrino burst. Any claim of a finite Y mass is very model-dependent. It is shown that the Kamioka-IMB neutrino burst experimentally implies an event with about 2 to 4 x 1O53 ergs emitted in neutrinos and a temperature, Z’D~, of between 4 and 4.5 MeV. This event is in excellent agreement with what one would expect from the gravitational core collapse of a massive star. While a couple of the Kamioka events are probably due to electron scattering, the lack of v, detection at Homestake’s detector partially constrains models which produce significantly more v,‘s at higher energy than the standard model. A neutrino detection, reported earlier in Mt. Blanc, if real, would imply 2 4 x 1O54 ergs emitted in neutrinos with oc temperatures between 0.3 and 1.8 MeV. The lack of simultaneous detection by Kamioka is difficult but not impossible to explain with a low temperature, high luminosity event. However, the high luminosity is difficult to understand on theoretical grounds." @default.
- W2163683034 created "2016-06-24" @default.
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- W2163683034 date "1987-06-01" @default.
- W2163683034 modified "2023-09-24" @default.
- W2163683034 title "Neutrinos from supernova 1987A" @default.
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