From: helbig@asclothestro.multivax.de   
      
   In article <693dc170-665b-478d-b351-3c543da09c36@googlegroups.com>,   
   raymond.yohros@gmail.com writes:   
      
   > On Sunday, March 29, 2020 at 3:43:29 PM UTC-5, Michael Moroney wrote:   
   >> Speaking of which, I don't see how a neutrino could convert to a   
   >> different type with a different mass without violating conservation of   
   >> energy, momentum or both. What is happening with this?   
      
   It's a difficult concept, but not unknown in particle physics.  Observed   
   particles can be mixtures of other particles, and the state of the   
   mixture can changed during propagation, so it's not like one type of   
   neutrino can change into another (which would indeed be forbidden by   
   conservation laws).   
      
   > and the irony is that conservation laws are the reason they   
   > where discovered!   
      
   Isaac Asimov wrote a book on the neutrino.  The neutrino makes its   
   introduction about halfway through the book.  The first half is about   
   conservation laws.   
      
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