Latest documents http://publikationen.ub.uni-frankfurt.de/index/index/ Mon, 18 Feb 2013 15:51:02 +0100 Mon, 18 Feb 2013 15:51:02 +0100 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/28938 Radiation damage following the ionising radiation of tissue has different scenarios and mechanisms depending on the projectiles or radiation modality. We investigate the radiation damage effects due to shock waves produced by ions. We analyse the strength of the shock wave capable of directly producing DNA strand breaks and, depending on the ion's linear energy transfer, estimate the radius from the ion's path, within which DNA damage by the shock wave mechanism is dominant. At much smaller values of linear energy transfer, the shock waves turn out to be instrumental in propagating reactive species formed close to the ion's path to large distances, successfully competing with diffusion. Eugene Surdutovich; Alexander V. Yakubovich; Andrey V. Solov'yov article http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/28938 Mon, 18 Feb 2013 15:51:02 +0100 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/2376 We have investigated the channeling process of charged particles in a bent crystal. Invoking simple assumptions we derive a criterion, which determines whether channeling occurs or not. We obtain the same criterion using the Dirac equation. It is shown that the centrifugal force acting on the particle in the bent crystal significantly alters the effective transverse potential. The cases of axial and planar channeling are considered. The channeling probability and the dechanneling probability due to tunneling of the particle under the barrier in the effective transverse potential are estimated. These probabilities depend on the specific scaling parameter characterizing the process. Using the quasiclassical theory of synchrotron radiation we have calculated the contribution to the radiation spectrum, which arises due to the curvature of the channel. This contribution becomes significant to TeV electrons or positrons. Some practical consequences of our results are briefly discussed. Andrey V. Solov'yov; Andreas Schäfer; Walter Greiner article http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/2376 Fri, 14 Jul 2006 10:28:15 +0200