最新刊期
卷 0 ， 期 0 ， 2020
- 摘要：The defect distribution in Ni was studied using a slow positron beam after N+ions implantation with energy of 95 keV and dose of 6.4×1017/cm2. The positron diffusion parameter in defect- free Ni was derived to be Eo= 4.6 ±0.6keV. It was found that defects in the sample existed from surface to the depth of 190nm and the largest defect density was in the region from 27nm to 110nm. This result is in agreement with that of Monte Carlo simulation calculation.
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发布时间：2021-04-09 - 摘要：Under a prolong time neutron irradiation of 232Th by a strong constant neutron flux, a part of 232Th atoms will be converted into a series other nuclides as a result of successive neutron interaction. These neutron born daughter nuclides of 232Th consist of fissile nuclides such as 233U,235U,239Pu,241Pu, … and fertile nuclides, such as 233Pa,234U,236U,237Np,238Pu etc. As a rule the concentration of each daughter nuclide starts from zero and then increases gradually as the irradiation proceeds until reaching a saturated value and then decreases at a similar rate as the decreasing rate of 232Th. A reactor fueled with thorium and its whole family of neutron born daughter nuclides, with each daughter nuclide at its own saturated concentration, may possess some interesting properties. A preliminary study of the feasibility of such constellation type fissile fuels reactor is presented.
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发布时间：2021-04-09 - 摘要：The composition and strain of GexSi1-x/Si strained layer superlattice （SLS） have been studied by the RBS channeling technique. The experimental results turn out to be in good agreement with the growth data and theoretical calculations. This work has shown that the RBS channeling technique is a quite powerful method in structure studies of SLS materials.
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发布时间：2021-04-09 - 摘要：The time differential perturbed angular correlation method has been used to study the radiation damage in Ag and its annealing behaviour and healing effect. Monovacancies were created by 111In recoils from the reaction 109Ag（α,2n）111In. A unique quadrupole interaction with a sharp frequency of 76.2MHz was observed following the nuclear reaction. After annealing at 673K the unique quadrupole interaction disappeared and the probe nuclei experinced only an interaction of electric field gradient distribution which was caused by distant defects. The radiation damage was completely annealed at 873 K. The dependence of radiation damage on healing time shows that the probe nuclei still trap defects after 15 day healing but with a reduction of a factor of 3.5. The width of electric field gradient distribution decreases with increasing healing time and becomes independent of healing time after 6 day healing. Healing mainly takes place in 2 to 10 days after irradiation.
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发布时间：2021-04-09 - 摘要：An investigation on the decay of 147Nd has been carried out by a HPGe γ ray spectrometer and a Ge（Li） and NaI（Tl） γ-γ coincidence spectrometer. New levels 730.7 keV and 859.2keV of 147Pm are found. Existence of the 641keV level and the 231keV γ transition in 147Pm is proved. No evidence can be found for the 807 keV level and the 716 keV γ ray. Energy spectra of 147Pm is studied by the angular momentum projection method and the calculated results are compared with experimental data.
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发布时间：2021-04-09 - 摘要：Cold fusion has been investigated by the electrolytical method and the deuterium absorption method. In one of the five runs of the electrolytical experiments a neutron burst was observed at the 90th hour after starting the electrolysis. The detected neutron burst lasted about 4 hours with an intensity of 400 fusions per second. Counting rates of the BF3 long neutron counter and the liquid scintillation detector were simultaneously increased by a factor of 15 compared to the background. A recoil proton energy spectrum of 2.45 MeV neutrons was also measured by the liquid scintillation detector with n-γ discrimination.
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发布时间：2021-04-09 - 摘要：A proton microbeam with 2μm lateral resolution has been established at the Accelerator Laboratory of Fudan University and was used to study gold-bearing submicroscopic gold minerals and gold inclusions. Au is found to be closely related to Fe,S,and especially to As in the mineral sample from Jinya, Guangxi province.
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发布时间：2021-04-09 - 摘要：The measurement principle and apparatus of time spectrum of γ ray exposure rate by the pinhole technique are described,and some real measurement results of time spectrum of γ ray exposure rate have been obtained. It provides a measurement method and a set of reference data for the studies of the nuclear radiation energy.
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发布时间：2021-04-09 - 摘要：An economical and handy on-line gas-jet fast tape transport system has been built. Its structure is described. The system has been tested and regulated off-line and on-line,and its functions have been determined carefully. The system is very suitable for the experimental study of refractory nuclides and nuclides with short lifetime far from stability.
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发布时间：2021-04-09 - 摘要：Sn Mb’ssbauer spectra for the surface layer of Sb doped SnO2 thin film have been obtained by using CEMS method. The gas- sensing response of these films for H2 and CO depends on concentration of doped Sb（x%） and annealing temperature . It is found that when x = 1% the CEMS parameters of samples δ（IS） and σ△ （QS’s distribution width） reach minima while the gas sensing sensitivity reachs maximum. The gas sensitive mechanism is discussed.
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发布时间：2021-04-09 - 摘要：A γ-ray transmission method for measuring the density of chlorinated pellet material is described. It can be used for density correction in the thermal neutron transmission gauge. The principle of measurement, choice of γ- ray source, response of lithium glass to γ- rays and mass attenuation coefficient of γ-rays for the material are discussed. The mass attenuation coefficient has been determined experimentally and the relative error of the density measurement is about 2%.
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发布时间：2021-04-09 - 摘要：In this paper, the extraction of fission products from nitric acid media by di（2-ethylhexyl） sulfoxide（DEHSO） and the effect of γ ray irradiation on its extraction ability is described. All studies on DEHSO are compared with those on TBP. The distribution ratio of fission products as a function of aqueous nitric acid concentration is in similar manner for DEHSO and TBP,but the distribution ratio with DEHSO is usually higher than that with TBP. The radiolytic stability of DEHSO is better than that of TBP.
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发布时间：2021-04-09 - 摘要：Thermal neutron scattering is an important branch of applied nuclear technology.The only thermal neutron scattering laboratory in China has been established, at CIAE,where the experimental facilities are available to the scientists from all over the country. During the past years thermal neutron scattering technology in this laboratory has been applied to some fields, thus several research orientations being formed. Interesting results in both basic and applied sciences have been obtained. If continue supports are offered, more creative works be done in the near future.
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发布时间：2021-04-09 - 摘要：An accelerator mass spectrometry （AMS） based on the SINK 6MV tandem accelerator has been constructed. Some preliminary applications have been performed on this facility in archaeology, earth science and nuclear physics.
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发布时间：2021-04-09
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