Dirac neutrinos and SN 1987A

Technical Report · Wed May 01 04:00:00 EDT 1991

OSTI ID:5393964

Turner, M S

Previous work has shown that the cooling of SN 1987A excludes a Dirac-neutrino mass greater than theta(20 keV) for nu(sub e), nu(sub mu), or nu(sub tau). The emission of wrong-helicity, Dirac neutrinos from SN 1987A, is re-examined. It is concluded that the effect of a Dirac neutrino on the cooling of SN 1987A has been underestimated due to neutrino degeneracy and additional emission processes. The limit that follows from the cooling of SN 1987A is believed to be greater (probably much greater) than 10 keV. This result is significant in light of the recent evidence for a 17 keV mass eigenstate that mixes with the electron neutrino.

• Research Organization: Fermi National Accelerator Lab., Batavia, IL (United States)
• OSTI ID: 5393964
• Report Number(s): N-91-24865; NASA-CR--188448; NAS--1.26:188448; FERMILAB-PUB--91/136-A; CNN: NAGW-1340
• Country of Publication: United States
• Language: English

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COOLING
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ELEMENTARY PARTICLES
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FERMIONS
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