Enhanced production ofNa24by wide-angle secondaries produced in the interaction of relativistic carbon ions with copper
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Abstract
Radiochemical activation techniques were used to study the behavior of projectile fragments formed in the interaction of 44 GeV $^{12}\mathrm{C}$ ions within thick Cu targets. After a short review of the results obtained hitherto with this Cu-target technique, the interaction of 44 GeV $^{12}\mathrm{C}$ with several copper target configurations yielding the deep spallation product $^{24}\mathrm{Na}$ is described. Energetic fragments which are emitted into the laboratory angles 10\ifmmode^\circ\else\textdegree\fi{}\ensuremath{\le}\ensuremath{\theta}\ensuremath{\le}45\ifmmode^\circ\else\textdegree\fi{} appear to produce more $^{24}\mathrm{Na}$ (up to nearly one order of magnitude) than calculated with a phenomenological model and an intranuclear cascade model. This enhanced production of $^{24}\mathrm{Na}$ by wide-angle secondaries is only observed for 44 GeV $^{12}\mathrm{C}$ on copper, but not for 25 GeV $^{12}\mathrm{C}$ on copper. Some normalization experiments with 4 GeV $^{4}\mathrm{He}$ and 2.6 GeV p are described.
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