A new limit for diffuse relic supernovae neutrino flux

• Grant number: 06/00783-1
• Support Opportunities: Scholarships abroad - Research
• Start date: April 15, 2006
• End date: July 14, 2006
• Field of knowledge: Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
• Principal Investigator: Orlando Luis Goulart Peres
• Grantee: Orlando Luis Goulart Peres
• Host Investigator: Cecilia Lunardini
• Host Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Institution abroad: Institute for Nuclear Theory (INT), United States

Abstract

We compute an improved limit on the diffuse flux of electron neutrinos from all supernovae by imposing compatibility with the Super-Kamiokande data in the energy range above $E_{e}>18$~MeV. Our new limit is $\Phi(\nu_e) <5.0 \times 10^{2}$cm$^{-2}$s$^{-1}$, one order better than the old limit. We discuss also a similar limit for the flux of non-electron neutrinos coming from past supernovas. (AU)