In association with an X17.0 flare on 2005 September 7, strong neutral
emissions were detected both in space and on the ground. In space, intense
emissions of gamma-rays were registered by INTEGRAL and by RHESSI during
the decay phase. Gamma-ray lines at 0.511, 2.2, 4.4, and 6.1 MeV were
observed and there was evidence for pion-decay radiation. On the ground,
relativistic neutrons were o
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