| Issue |
A&A
Volume 390, Number 3, August II 2002
|
|
|---|---|---|
| Page(s) | L31 - L34 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20020939 | |
| Published online | 14 August 2002 | |
Letter to the Editor
Nucleosynthesis in 
ray bursts outflows
Institut d'Astrophysique de Paris, GReCO, CNRS, 98 bis boulevard Arago, 75014 Paris, France
Corresponding author: lemoine@iap.fr
Received:
1
April
2002
Accepted:
19
June
2002
It is shown that fusion of neutrons and protons to 4He nuclei occurs in ray burst
outflows in a process similar to big-bang nucleosynthesis in the early Universe. Only the surviving
free neutrons can then decouple kinematically from the charged fluid so that the multi-GeV neutrino signal
predicted from inelastic nuclear n-p collisions is significantly reduced. It is also argued that a
sizeable fraction of ultra-high energy cosmic rays accelerated in ray bursts should be 4He
nuclei.
Key words: nucleosynthesis - gamma rays: bursts
© ESO, 2002
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