Abstract
The independent yields, recoil properties, and forward-to-backward ratios (F/B) of iodine isotopes from the interaction of 240 MeV $^{12}\mathrm{C}$ with $^{238}\mathrm{U}$ have been measured radiochemically by the thick-target/thick-catcher method. The isotopic yield distribution curve has been constructed and is found to consist of two overlapping Gaussians, peaking at A=126.5 and 133.8 with width parameters of 2.29 and 2.04 mass units, respectively. All the measured iodine isotopes had ranges of 7.7\ifmmode\pm\else\textpm\fi{}0.4 mg/${\mathrm{cm}}^{2}$. The neutron-deficient products have F/B of 1.76\ifmmode\pm\else\textpm\fi{}0.14, but the neutron-excessive products have F/B of only 1.09\ifmmode\pm\else\textpm\fi{}0.06. The yield curve was analyzed with the liquid drop model and the recoil curve was analyzed by the standard two-step vector model; the results show that the neutron-deficient products are formed from nonequilibrium processes and the neutron-excessive products are formed from the normal low-energy fission process.
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