Marinov et al. have detected spontaneous fission events in sources separated from tungsten targets irradiated with 24 GeV protons. These fission events could not be attributed to actinides or to any other known isotop...Marinov et al. have detected spontaneous fission events in sources separated from tungsten targets irradiated with 24 GeV protons. These fission events could not be attributed to actinides or to any other known isotope. Marinov et al. propose that fission events are due to production of element 112 (Eka-Hg) in the tungsten target. We have addressed Marinov’s claim with a new analysis of their data and modern theoretical model calculations of possible interactions. Using data available in the literature the spontaneous fission half-life of the Eka-Hg was estimated to be ~74 days. This is dramatically longer than the half-life obtained for 283112Cn, produced in the fusion of energetic 48Ca ions with 238U. Monte Carlo calculations show that enough Sr isotopes are produced in the tungsten target to make the production of element 112 via fusion of Sr and W feasible;however, if such fusion was possible it had to be deep sub-barrier fusion.展开更多
From the experimental data on ceramic/aluminum composite target, the mechanism of tungsten ball impacting a ceramic/aluminum composite target has been studied. By analyzing the transition of energy in the process of i...From the experimental data on ceramic/aluminum composite target, the mechanism of tungsten ball impacting a ceramic/aluminum composite target has been studied. By analyzing the transition of energy in the process of impact, a simple ballistic limit analytical model of tungsten ball impacting a ceramic/aluminum composite target has been proposed; and the result taken from this model is consistent with that of the experiment.展开更多
A new concept of the Gravity-driven dense granular flow spallation target for ADS was proposed. The target material is discrete Tungsten-based alloys solid particles. The neutron transport behavior in granular Tungste...A new concept of the Gravity-driven dense granular flow spallation target for ADS was proposed. The target material is discrete Tungsten-based alloys solid particles. The neutron transport behavior in granular Tungsten is very important for the design of spallation target.The neutron transport behavior in granular Tungsten target was studied in detail.展开更多
The design of ADS spallation target requires precise and reliable nuclear data. ADS research team of Chinese Academy of Sciences (CAS) proposed a new concept for a Gravity-driven dense granular flow spallation target[...The design of ADS spallation target requires precise and reliable nuclear data. ADS research team of Chinese Academy of Sciences (CAS) proposed a new concept for a Gravity-driven dense granular flow spallation target[1].The target material is Tungsten-based alloys solid particles. The neutron nuclear data of granular Tungsten is very important for the design of spallation target.展开更多
文摘Marinov et al. have detected spontaneous fission events in sources separated from tungsten targets irradiated with 24 GeV protons. These fission events could not be attributed to actinides or to any other known isotope. Marinov et al. propose that fission events are due to production of element 112 (Eka-Hg) in the tungsten target. We have addressed Marinov’s claim with a new analysis of their data and modern theoretical model calculations of possible interactions. Using data available in the literature the spontaneous fission half-life of the Eka-Hg was estimated to be ~74 days. This is dramatically longer than the half-life obtained for 283112Cn, produced in the fusion of energetic 48Ca ions with 238U. Monte Carlo calculations show that enough Sr isotopes are produced in the tungsten target to make the production of element 112 via fusion of Sr and W feasible;however, if such fusion was possible it had to be deep sub-barrier fusion.
文摘From the experimental data on ceramic/aluminum composite target, the mechanism of tungsten ball impacting a ceramic/aluminum composite target has been studied. By analyzing the transition of energy in the process of impact, a simple ballistic limit analytical model of tungsten ball impacting a ceramic/aluminum composite target has been proposed; and the result taken from this model is consistent with that of the experiment.
文摘A new concept of the Gravity-driven dense granular flow spallation target for ADS was proposed. The target material is discrete Tungsten-based alloys solid particles. The neutron transport behavior in granular Tungsten is very important for the design of spallation target.The neutron transport behavior in granular Tungsten target was studied in detail.
文摘The design of ADS spallation target requires precise and reliable nuclear data. ADS research team of Chinese Academy of Sciences (CAS) proposed a new concept for a Gravity-driven dense granular flow spallation target[1].The target material is Tungsten-based alloys solid particles. The neutron nuclear data of granular Tungsten is very important for the design of spallation target.
