34 research outputs found

    Spallation of

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    A comprehensive set of 110 radioactive nuclide cross sections with mass numbers 22 ≤ A ≤ 198 amu in the interaction of 4.4-GeV deuterons with 197Au have been measured for the first time. The results including charge distributions have been parameterized in term of a 3-parameter equation in order to reproduces the isobaric distributions. Using data from the charge distributions, the total mass-yield distribution was obtained. The new experimental data of the recoil properties of reaction products were also obtained. Kinematical characteristics of the reaction products obtained from measurements of the residuals emitted in the forward and backward directions exhibit different behavior depending on the mass region. The kinematical features of reaction products have been analyzed on the basis of the two-step model of high-energy nuclear reactions and discussed in terms of the different reaction mechanisms

    Production of the 178m2^{178m2}Hf Isomer Using a 4.5GeV Electron Accelerator

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    Highproductivity methods are required for the accumulation of longlived isomers in amounts that are sufficient for the creation of experimental targets. A tantalum sample was activated with the Yerevan synchrotron using 4.5GeV bremsstrahlung and the presence of ^{178m2}Hf was detected with good statistical accuracy by gammaactivity measurements. The integrated and mean crosssection values were deduced from the experiment. The isomertogroundstate ratio was then estimated and compared with that known for the p+Ta reaction studied at 660 MeV. In the present experiment, both the converter and the target were relatively thin for better definition of the experimental conditions. However, an assembly designed for highproductivity irradiations should be thick and the converter can also serve as a target sample when irradiated with a highenergy electron beam. The optimization of the isomer production was solved analytically and the largest estimated yield was determined as calibrated to the experimental yield. The maximum yield of ^{178m2}Hf was found to be of about 3\cdot 10^9 nuclei/s using an electron beam current of 100 {\mu}A. This is lower than the yield achieved with proton beams, although for a practical comparison the total cost and radiation safety conditions should be considered. The present results provide a basis for numerical estimations
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