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Effects of isotope selection on solution convergence in HZE transport (1994)

Thibeault, Sheila A. ; Kim, Myung-Hee Y. ; Kiefer, Richard L. ; [et al.]

In: CASI

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Publication Date: 2019-06-28

Description: A fragmenting iron ion produces hundreds of isotopes during nuclear reactions. These isotopes are represented in the solution of the transport problem. A reduced set of isotopes is selected to minimize the computational burden but introduces error in the final result. A minimum list of 122 isotopes is required for adequate representation of the mass and charge distributions of the secondary radiation fields. A reduced set of 80 isotopes is sufficient to represent the charge distribution alone and represents reasonably well the linear energy transfer properties of the iron beam. Because iron fragmentation produces nearly every isotope lighter than iron, the resulting 122-isotope list should be adequate for ion beams with charges equal to or less than 26.

Keywords: SPACE RADIATION

Type: NASA-TP-3445 , L-17357 , NAS 1.60:3445

Format: application/pdf

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