Beta decay radiation signature from neutron-rich gamma-ray bursts?

Details Beta decay radiation signature from neutron-rich gamma-ray bursts? Beta decay radiation signature from neutron-rich gamma-ray bursts?

2006-03-13

arxiv.org/abs/astro-ph/0603322v2

JCAP 0606 (2006) 006

Astronomy and Astrophysics

Astrophysics

11 pages, 2 figures, reference added, published version

Scientific paper

10.1088/1475-7516/2006/06/006

Core collapse of massive stars and binary neutron stars or black hole-neutron star binary mergers are likely progenitors of long and short duration gamma-ray bursts respectively. Neutronized material in the former and neutron star material in the latter are ejected by the central engine implying a neutron-rich jet outflow. A free neutron, however, beta decays to a proton, an electron (beta) and an anti-neutrino in about fifteen minutes in its rest frame. Sudden creation of a relativistic electron is accompanied by radiation with unique temporal and spectral signature. We calculate here this radiation signature collectively emitted by all beta decay electrons from neutron-rich outflow. Detection of this signature may thus provide strong evidence for not only neutron but also for proton content in the relativistic gamma-ray burst jets.

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