Projectile fragmentation of silicon ions at 490 A MeV

Fragmentation ofN14,O16,Zeitlin1, Guetersloh2, Heilbronn3 et al. 2011Phys. Rev. C

“…(Data points with 20 Ne at higher energies would be of interest.) For 24 Mg at 400 MeV/nucleon, we find a ratio of 2.32 ± 0.05, compatible with that found for 28 Si at the same beam energy.…”

“…In some instances, there are additional data from other groups that can be used for additional comparisons. Our chargechanging cross sections are generally in good agreement with those measured using plastic nuclear track detectors [16,24].…”

“…24 Mg Table XIII shows the cross sections obtained for the 400 MeV/nucleon 24 Mg beam, and Figure 9 shows the results of the acceptance calculation for this beam on a 4 g cm −2 12 C target as was used in the experiment. Also shown in Figure 9 are the efficiency curves found for the other experiments with 400 MeV/nucleon beams reported here.…”

“…Note that if all other variables are held constant except for the mass of the beam ion, as that mass increases the acceptance of the lightest fragments decreases, because the width of the angular distribution is driven by a term proportional to (A beam − A frag ) 1/2 . Since data are only available with a single beam energy for 24 Mg, we cannot probe these results for possible energy dependence of the production cross sections. However, other features of the data merit comment.…”

“…Furthermore, beams of C [3,4] and Ne ions [5] have also been used in cancer therapy, where fragmentation plays a key role in limiting the (desired) localization of the dose to the tumor volume. We present cross sections for beams of 14 N ions at 290 and 400 MeV/nucleon; 16 O at 290, 400, 600, and 1000 MeV/nucleon; 20 Ne at 290, 400, and 600 MeV/nucleon; and 24 Mg at 400 MeV/nucleon. Charge-changing (sometimes referred to as "total" charge-changing) cross sections and fragment production cross sections have been extracted from energy-loss spectra measured with silicon detectors.…”