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Exploiting the neutronization burst of a galactic supernova

M. Kachelrieß and R. Tomàs

R. Buras, H.-Th. Janka, A. Marek, and M. Rampp

  • Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, D-80805 München, Germany

  • Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85741 Garching, Germany

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Phys. Rev. D 71, 063003 – Published 28 March, 2005

DOI: https://doi.org/10.1103/PhysRevD.71.063003

Abstract

One of the robust features found in simulations of core-collapse supernovae (SNe) is the prompt neutronization burst, i.e., the first ∼25 milliseconds after bounce when the SN emits with very high luminosity mainly νe neutrinos. We examine the dependence of this burst on variations in the input of current SN models and find that recent improvements of the electron capture rates as well as uncertainties in the nuclear equation of state or a variation of the progenitor mass have only little effect on the signature of the neutronization peak in a megaton water Cherenkov detector for different neutrino mixing schemes. We show that exploiting the time structure of the neutronization peak allows one to identify the case of a normal mass hierarchy and large 13-mixing angle ϑ13, where the peak is absent. The robustness of the predicted total event number in the neutronization burst makes a measurement of the distance to the SN feasible with a precision of about 5%, even in the likely case that the SN is optically obscured.

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Phys. Rev. D 71, 063003– Published 28 March, 2005
  • Received 13 December 2004

© 2005 American Physical Society

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