Differential ranges of Sc fragments from the interaction ofU238with 0.8-400 GeV protons

Abstract

Differential ranges of $^{44}\mathrm{Sc}^{m}$ $^{46}\mathrm{Sc}$, $^{47}\mathrm{Sc}$, and $^{48}\mathrm{Sc}$ emitted at 90\ifmmode^\circ\else\textdegree\fi{} to the beam in the interaction of $^{238}\mathrm{U}$ with 0.8, 3.0, 11.5, and 400 GeV protons have been measured and transformed to the corresponding energy spectra. The mean fragment energies decrease from 83\ifmmode\pm\else\textpm\fi{}5 to 58\ifmmode\pm\else\textpm\fi{}4 MeV between 0.8 and 11.5 GeV and to 50\ifmmode\pm\else\textpm\fi{}3 MeV at 400 GeV. The widths of the spectra increase markedly with energy up to 11.5 GeV and more slowly thereafter. Isotopic differences are minor although the spectra of neutron-deficient $^{44}\mathrm{Sc}^{m}$ are somewhat broader, particularly at 0.8 GeV. The results are compared with the statistical fragment emission model and discussed in terms of asymmetric binary fission and deep spallation mechanisms.NUCLEAR REACTIONS $^{238}\mathrm{U}(p,x)^{44}\mathrm{Sc}^{m}$, $^{46}\mathrm{Sc}$, $^{47}\mathrm{Sc}$, $^{48}\mathrm{Sc}$. ${T}_{p}=0.8,3.0,11.5,400$ GeV. Measured differential ranges at 90\ifmmode^\circ\else\textdegree\fi{}; deduced energy spectra.