Laser-accelerated high-flux-intensity heavy-ion beams are important for new types of accelerators.A particle-in-cell program(Smilei) is employed to simulate the entire process of Station of Extreme Light(SEL) 100 PW l...Laser-accelerated high-flux-intensity heavy-ion beams are important for new types of accelerators.A particle-in-cell program(Smilei) is employed to simulate the entire process of Station of Extreme Light(SEL) 100 PW laser-accelerated heavy particles using different nanoscale short targets with a thickness of 100 nm Cr, Fe, Ag, Ta, Au, Pb, Th and U, as well as 200 nm thick Al and Ca. An obvious stratification is observed in the simulation. The layering phenomenon is a hybrid acceleration mechanism reflecting target normal sheath acceleration and radiation pressure acceleration, and this phenomenon is understood from the simulated energy spectrum,ionization and spatial electric field distribution. According to the stratification, it is suggested that high-quality heavy-ion beams could be expected for fusion reactions to synthesize superheavy nuclei. Two plasma clusters in the stratification are observed simultaneously, which suggest new techniques for plasma experiments as well as thinner metal targets in the precision machining process.展开更多
在巨正则模型下,利用两相似反应系统的同质异位素产额比之差(Isobaric yield ratio difference,IBD),研究中等质量余核化学势与反应系统的关联。结果表明,两相似反应系统的Δμ/T之差Δμ21/T对两反应系统双中质比(N/Z)21很敏感,说明Δ...在巨正则模型下,利用两相似反应系统的同质异位素产额比之差(Isobaric yield ratio difference,IBD),研究中等质量余核化学势与反应系统的关联。结果表明,两相似反应系统的Δμ/T之差Δμ21/T对两反应系统双中质比(N/Z)21很敏感,说明Δμ/T对反应系统具有依赖性。同时发现,当(N/Z)21=1.17时,两反应系统不同余核的Δμ21/T趋于一个常数,说明在这两个系统中,利用IBD和同位旋标度方法获得的对称能信息更合理,且符合得更好。展开更多
应用一种扩展的分子动力学模型(Extension of quantum molecular dynamics,EQMD)研究了轻核的晕结构和团簇结构。对于晕结构,详细讨论了晕结构核在EQMD模型框架下的初始化,给出了14Be、17B、19C和22C的晕核结构性质和物质密度分布,讨论...应用一种扩展的分子动力学模型(Extension of quantum molecular dynamics,EQMD)研究了轻核的晕结构和团簇结构。对于晕结构,详细讨论了晕结构核在EQMD模型框架下的初始化,给出了14Be、17B、19C和22C的晕核结构性质和物质密度分布,讨论了价中子波包宽度、核芯核子的波包宽度以及核芯的形态对于晕结构存在的重要性。对于团簇结构,给出了EQMD模型框架下对于轻的4n核的α团簇态的描述结果,讨论了不同团簇态的稳定性、结合能以及不同核子的波包宽度,指出了团簇态在自由演化过程中的α之间能量流动性质。并讨论了4-α正四面体结构作为16O基态的可能性。展开更多
Silver indium cadmium(Ag–In–Cd) control rod is widely used in pressurized water reactor nuclear power plants,and it is continuously consumed in a high neutron flux environment. The mass ratio of ^(107)Ag in the Ag...Silver indium cadmium(Ag–In–Cd) control rod is widely used in pressurized water reactor nuclear power plants,and it is continuously consumed in a high neutron flux environment. The mass ratio of ^(107)Ag in the Ag–In–Cd control rod is 41.44%. To accurately calculate the consumption value of the control rod, a reliable neutron reaction cross section of the ^(107)Ag is required. Meanwhile,^(107)Ag is also an important weak r nucleus. Thus, the cross sections for neutron induced interactions with ^(107)Ag are very important both in nuclear energy and nuclear astrophysics. The(n, γ) cross section of ^(107)Ag has been measured in the energy range of 1–60 eV using a back streaming white neutron beam line at China spallation neutron source. The resonance parameters are extracted by an R-matrix code. All the cross section of ^(107)Ag and resonance parameters are given in this paper as datasets. The datasets are openly available at http://www.doi.org/10.11922/sciencedb.j00113.00010.展开更多
The^(74)Se is one of 35 p-nuclei,and^(82)Se is a r-process only nucleus,and their(n,γ)cross sections are vital input parameters for nuclear astrophysics reaction network calculations.The neutron capture cross section...The^(74)Se is one of 35 p-nuclei,and^(82)Se is a r-process only nucleus,and their(n,γ)cross sections are vital input parameters for nuclear astrophysics reaction network calculations.The neutron capture cross section in the resonance range of isotopes and even natural selenium samples has not been measured.Promptγ-rays originating from neutron-induced capture events were detected by four C_(6)D_(6) liquid scintillator detectors at the Back-n facility of China Spallation Neutron Source(CSNS).The pulse height weighting technique(PHWT)was used to analyze the data in the 1 e V to 100 ke V region.The deduced neutron capture cross section was compared with ENDF/B-VIII.0,JEFF-3.2,and JENDL-4.0,and some differences were found.Resonance parameters were extracted by the R-matrix code SAMMY in the 1 e V-1 ke V region.All the cross sections ofnatSe and resonance parameters are given in the datasets.The datasets are openly available at http://www.doi.org/10.11922/sciencedb.j00113.00019.展开更多
The neutron induced reactions on stable Carbon,Nitrogen,and Oxygen isotopes are investigated by using the Talysl.4 toolkit with the default parameters.The neutron incident energy covers a range from 0.20 MeV to85.00 M...The neutron induced reactions on stable Carbon,Nitrogen,and Oxygen isotopes are investigated by using the Talysl.4 toolkit with the default parameters.The neutron incident energy covers a range from 0.20 MeV to85.00 MeV.For^(l2)C and^(14)N,the Talysl.4 results agree with the experimental data,while the parameters should be adjusted for^(l6)O.Some E?windows are found by comparing the main channels of n+C/N/O reactions,which induce element change.In these E_n windows,a specific element is activated to a different one while leaving the other element atoms unchanged.The results will facilitate the research of doping effects in organic materials by using neutron activation technique.展开更多
The multiplicity of fragments in Fermi energy heavy-ion collisions was experimen- tally extracted. Compared with the results of calculation using the antisymmetrized molecular dynamics （AMD） model which accounts for...The multiplicity of fragments in Fermi energy heavy-ion collisions was experimen- tally extracted. Compared with the results of calculation using the antisymmetrized molecular dynamics （AMD） model which accounts for the primary fragments only, the results calculated using the AMD together with a statistical decay code GEMINI to account for the deexcitation of excited primary fragments are in better agreement with those extracted from the experiment. This observation indicates that the experimental multiplicity distribution may be significantly different from those of primary fragments.展开更多
基金support from the Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDB34030000)the National Key R & D Program of China (No.2022YFA1602404)+2 种基金National Natural Science Foundation of China (No. U1832129)the Youth Innovation Promotion Association of the Chinese Academy of Sciences (No.2017309)the Program for Innovative Research Team (in Science and Technology) in University of Henan Province of China (No.21IRTSTHN011)。
文摘Laser-accelerated high-flux-intensity heavy-ion beams are important for new types of accelerators.A particle-in-cell program(Smilei) is employed to simulate the entire process of Station of Extreme Light(SEL) 100 PW laser-accelerated heavy particles using different nanoscale short targets with a thickness of 100 nm Cr, Fe, Ag, Ta, Au, Pb, Th and U, as well as 200 nm thick Al and Ca. An obvious stratification is observed in the simulation. The layering phenomenon is a hybrid acceleration mechanism reflecting target normal sheath acceleration and radiation pressure acceleration, and this phenomenon is understood from the simulated energy spectrum,ionization and spatial electric field distribution. According to the stratification, it is suggested that high-quality heavy-ion beams could be expected for fusion reactions to synthesize superheavy nuclei. Two plasma clusters in the stratification are observed simultaneously, which suggest new techniques for plasma experiments as well as thinner metal targets in the precision machining process.
文摘在巨正则模型下,利用两相似反应系统的同质异位素产额比之差(Isobaric yield ratio difference,IBD),研究中等质量余核化学势与反应系统的关联。结果表明,两相似反应系统的Δμ/T之差Δμ21/T对两反应系统双中质比(N/Z)21很敏感,说明Δμ/T对反应系统具有依赖性。同时发现,当(N/Z)21=1.17时,两反应系统不同余核的Δμ21/T趋于一个常数,说明在这两个系统中,利用IBD和同位旋标度方法获得的对称能信息更合理,且符合得更好。
文摘应用一种扩展的分子动力学模型(Extension of quantum molecular dynamics,EQMD)研究了轻核的晕结构和团簇结构。对于晕结构,详细讨论了晕结构核在EQMD模型框架下的初始化,给出了14Be、17B、19C和22C的晕核结构性质和物质密度分布,讨论了价中子波包宽度、核芯核子的波包宽度以及核芯的形态对于晕结构存在的重要性。对于团簇结构,给出了EQMD模型框架下对于轻的4n核的α团簇态的描述结果,讨论了不同团簇态的稳定性、结合能以及不同核子的波包宽度,指出了团簇态在自由演化过程中的α之间能量流动性质。并讨论了4-α正四面体结构作为16O基态的可能性。
基金supported by the National Natural Science Foundation of China (Grant Nos. 11875311, 11905274, 1705156, U2032146, 11865010, 11765015, and 1160509)the Natural Science Foundation of Inner Mongolia, China (Grant Nos. 2019JQ01 and 2018MS01009)the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB34030000)。
文摘Silver indium cadmium(Ag–In–Cd) control rod is widely used in pressurized water reactor nuclear power plants,and it is continuously consumed in a high neutron flux environment. The mass ratio of ^(107)Ag in the Ag–In–Cd control rod is 41.44%. To accurately calculate the consumption value of the control rod, a reliable neutron reaction cross section of the ^(107)Ag is required. Meanwhile,^(107)Ag is also an important weak r nucleus. Thus, the cross sections for neutron induced interactions with ^(107)Ag are very important both in nuclear energy and nuclear astrophysics. The(n, γ) cross section of ^(107)Ag has been measured in the energy range of 1–60 eV using a back streaming white neutron beam line at China spallation neutron source. The resonance parameters are extracted by an R-matrix code. All the cross section of ^(107)Ag and resonance parameters are given in this paper as datasets. The datasets are openly available at http://www.doi.org/10.11922/sciencedb.j00113.00010.
基金supported by the National Natural Science Foundation of China(Grant Nos.11875311,11905274,11705156,11605097,and U2032146)the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB34030000)。
文摘The^(74)Se is one of 35 p-nuclei,and^(82)Se is a r-process only nucleus,and their(n,γ)cross sections are vital input parameters for nuclear astrophysics reaction network calculations.The neutron capture cross section in the resonance range of isotopes and even natural selenium samples has not been measured.Promptγ-rays originating from neutron-induced capture events were detected by four C_(6)D_(6) liquid scintillator detectors at the Back-n facility of China Spallation Neutron Source(CSNS).The pulse height weighting technique(PHWT)was used to analyze the data in the 1 e V to 100 ke V region.The deduced neutron capture cross section was compared with ENDF/B-VIII.0,JEFF-3.2,and JENDL-4.0,and some differences were found.Resonance parameters were extracted by the R-matrix code SAMMY in the 1 e V-1 ke V region.All the cross sections ofnatSe and resonance parameters are given in the datasets.The datasets are openly available at http://www.doi.org/10.11922/sciencedb.j00113.00019.
基金Supported by the National Natural Science Foundation of China(No.11305239)the Program for Science and Technology Innovation Talentsin Universities of Henan Province(13HASTIT046)
文摘The neutron induced reactions on stable Carbon,Nitrogen,and Oxygen isotopes are investigated by using the Talysl.4 toolkit with the default parameters.The neutron incident energy covers a range from 0.20 MeV to85.00 MeV.For^(l2)C and^(14)N,the Talysl.4 results agree with the experimental data,while the parameters should be adjusted for^(l6)O.Some E?windows are found by comparing the main channels of n+C/N/O reactions,which induce element change.In these E_n windows,a specific element is activated to a different one while leaving the other element atoms unchanged.The results will facilitate the research of doping effects in organic materials by using neutron activation technique.
基金supported by National Natural Science Foundation of China(No.11075189)the"Hundred Gifted Scientist Plam"of the Chinese Academy of Sciences(Nos.0910020BRO,Y010110BRO)
文摘The multiplicity of fragments in Fermi energy heavy-ion collisions was experimen- tally extracted. Compared with the results of calculation using the antisymmetrized molecular dynamics （AMD） model which accounts for the primary fragments only, the results calculated using the AMD together with a statistical decay code GEMINI to account for the deexcitation of excited primary fragments are in better agreement with those extracted from the experiment. This observation indicates that the experimental multiplicity distribution may be significantly different from those of primary fragments.
