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    Decomposition of the absorbed dose by LET in tissue-equivalent materials within the SHIELD-HIT transport code
    (SCIENTIFIC TECHNICAL RESEARCH COUNCIL TURKEY-TUBITAK, 2017) Sobolevsky, Nikolai; Botvina, Alexander; Buyukcizmeci, Nihal; Kaya, Aysegul; Latysheva, Ludmila; Ogul, Riza
    The SHIELD-HIT transport code, in several versions, has been used for modeling the interaction of therapeutic beams of light nuclei with tissue-equivalent materials for a long time. All versions of the code include the useful option of decomposition of the absorbed dose by the linear energy transfer (LET), but this option has not been described and published to date. In this work the procedure of decomposition of the absorbed dose by LET is described and illustrated by using the decomposition of the Bragg curve in a water phantom, irradiated by beams of protons, alpha particles, and ions of lithium and carbon.
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    Isotopic distribution in projectile fragments above the Coulomb barrier
    (SCIENTIFIC TECHNICAL RESEARCH COUNCIL TURKEY-TUBITAK, 2018) Kaya, Aysegul; Buyukcizmeci, Nihal; Ogul, Riza
    We have studied fragmentation properties of projectiles in peripheral heavy-ion collisions within a statistical ensemble approach. Distributions of projectile fragments are calculated for the reaction systems Kr-86 on Ni-58(,)64 and are compared to the experimental data for the same reactions at projectile energy of 15 MeV/nucleon. We assume that the projectile nuclei capture many neutrons from the targets as a result of the multinucleon transfer reactions (direct and fast reactions) at the first step of the dynamical stage of the collisions, and then the excited spectators are formed during the preequilibrium process (multistep reactions) long before the statistical equilibrium stage, and the deexcitation processes for the hot sources are simulated within the statistical multifragmentation model. It is seen that predicted results are in satisfactory agreement with experimental data.