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- W2000177887 abstract "We report high spectral resolution measurements of the 2.223 MeV neutron-capture line obtained with the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) from the 2002 July 23 solar flare. The time history of this line is affected by both the photospheric 3He abundance and the angular distribution of the interacting flare-accelerated particles producing the neutrons. The measured time history is compared with predicted time histories calculated using a magnetic loop model with a magnetic field perpendicular to the solar surface at the footpoints. The model includes energy losses due to Coulomb collisions, removal by nuclear reactions, magnetic mirroring in the convergent flux tube, and MHD pitch-angle scattering in the corona. This is the first analysis of the neutron-capture line using such a physically based model. The derived constraints on the interacting angular distribution require that the accelerated particles had to suffer pitch-angle scattering during their transport through the coronal portion of the loop. The derived photospheric 3He/H ratio was not well constrained, primarily because of uncertainties associated with the measured nuclear de-excitation line flux used to represent the neutron-production time profile." @default.
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- W2000177887 date "2003-09-08" @default.
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- W2000177887 title "Physical Implications of <i>RHESSI</i> Neutron-Capture Line Measurements" @default.
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- W2000177887 doi "https://doi.org/10.1086/378175" @default.
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