The α-decay half-lives of a set of superheavy nuclear isotope chain from Z = 105 to 120 have been analyzed systematically within the WKB method, and some nuclear structure features are found. The decay barriers have ...The α-decay half-lives of a set of superheavy nuclear isotope chain from Z = 105 to 120 have been analyzed systematically within the WKB method, and some nuclear structure features are found. The decay barriers have been determined in the quasi-molecular shape path within the Generalized Liquid Drop Model （GLDM） including the proximity effects between nucleons in a neck and the mass and charge asymmetry. The results are in reasonable agreement with the published experimental data for the alpha decay half-llves of isotopes of charge 112, 114, and 116, of the element 294118 and of some decay products. A comparison of present calculations with the results by the DDM3Y effective interaction and by the Viola-Seaborg-Sobiczewski （VSS） formulae is also made. The experimental a decay half lives all stand in between the GLDM calculations and VSS formula results. This demonstrates the possibility of these models to provide reasonable estimates for the half-lives of nuclear decays by a emissions for the domain of SHN. The half-lives of these new nuclei are thus well tested from the reasonable consistence of the macroscopic, the microscopic, the empirical formulae and the experimental data. This also shows that the present data of SHN themselves are consistent. It could suggest that the present experimental claims on the existence of new elements Z =110 - 118 are reliable. It is expected that greater deviations of a few SHN between the data and the model may be eliminated by further improvements on the precision of the measurements.展开更多
Theα decay constant is the product of the penetrability P and assault frequency vo in the fission-like model. An effective assault frequency Pv replacing the previous assault frequency uo is introduced for improvemen...Theα decay constant is the product of the penetrability P and assault frequency vo in the fission-like model. An effective assault frequency Pv replacing the previous assault frequency uo is introduced for improvement of a fission-like model named the generalized liquid drop model （GLDM） to describe the nuclear α decay process more accurately. Two analytical formulae are proposed for the effective assault frequency due to experimental data within the GLDM. The improved model can be used to give accurate calculations for α decay half-lives.展开更多
The formula for the intensity of surface second-harmonic generation circular dichroism(SHG-CD)in helical molecular films is presented.The influence of the pitch and radius of helical molecules on the surface SHG-CD in...The formula for the intensity of surface second-harmonic generation circular dichroism(SHG-CD)in helical molecular films is presented.The influence of the pitch and radius of helical molecules on the surface SHG-CD intensity is numerically analysed.The existence of a peak in curves of the surface SHG-CD intensity versus the pitch and radius is predicted.The relation between the pitch and radius for different azimuthal angles is also discussed.展开更多
The nonequilibrium processes of the angular momentum dissipation of fragments in deeply inelastic heavy-ion collisions have been investigated through consideration of the nondiagonal elements of the diffusion tensor.T...The nonequilibrium processes of the angular momentum dissipation of fragments in deeply inelastic heavy-ion collisions have been investigated through consideration of the nondiagonal elements of the diffusion tensor.The diffusion tensor has been calculated microscopically.展开更多
对“他者”的识别与区分,是人类选择互动方式、建构秩序的前提,但区分的标准和条件则因时因地而千差万别。首先,人是大自然的产物,在瑞典生物学家林奈(Carl von Linne)的分类体系中,人属于动物界、脊索动物门、哺乳纲、灵长目、人科、...对“他者”的识别与区分,是人类选择互动方式、建构秩序的前提,但区分的标准和条件则因时因地而千差万别。首先,人是大自然的产物,在瑞典生物学家林奈(Carl von Linne)的分类体系中,人属于动物界、脊索动物门、哺乳纲、灵长目、人科、人属、人种,即相对于自然界其他物种而言,作为生命形态之一的人类具有高度的同质性。然而,在社会领域,人类自身不同群体的分类与归属则要复杂得多。据《圣经》记载,在诺亚洪水消退后的洪荒时代,劫后余生的人们都操着同样的语言,由于能够广泛交流,所以形成了共识,开始修建一座通往天堂的高塔。但这一壮举却冒犯了上帝,上帝认为人类因同心协力而形成的巨大力量挑战了他的神圣权威,于是一夜之间变乱了的语言,使人类因彼此无法交流而疏离隔绝,相互之间冲突不断。其实语言只是群体区分的维度之一,“人的本质是一切社会关系的总和”,地域分布、宗教信仰、经济地位、政治态度、文化习俗、历史记忆等,多向度的聚合与分化,使人类社会的群体类型空前复杂起来。展开更多
基金The project supported by National Natural Science Foundation of China under Grant Nos. 10505016 and 10575119, the Knowledge Innovation Project of the Chinese Academy of Sciences under Grant Nos. KJCX2-SW-N17, KJCX.SYW.N02, Major State Basic Research Development Program under Graalt No. 2007CB815000, and the Financial Support from DFG of Germany tCorresponding author,
文摘The α-decay half-lives of a set of superheavy nuclear isotope chain from Z = 105 to 120 have been analyzed systematically within the WKB method, and some nuclear structure features are found. The decay barriers have been determined in the quasi-molecular shape path within the Generalized Liquid Drop Model （GLDM） including the proximity effects between nucleons in a neck and the mass and charge asymmetry. The results are in reasonable agreement with the published experimental data for the alpha decay half-llves of isotopes of charge 112, 114, and 116, of the element 294118 and of some decay products. A comparison of present calculations with the results by the DDM3Y effective interaction and by the Viola-Seaborg-Sobiczewski （VSS） formulae is also made. The experimental a decay half lives all stand in between the GLDM calculations and VSS formula results. This demonstrates the possibility of these models to provide reasonable estimates for the half-lives of nuclear decays by a emissions for the domain of SHN. The half-lives of these new nuclei are thus well tested from the reasonable consistence of the macroscopic, the microscopic, the empirical formulae and the experimental data. This also shows that the present data of SHN themselves are consistent. It could suggest that the present experimental claims on the existence of new elements Z =110 - 118 are reliable. It is expected that greater deviations of a few SHN between the data and the model may be eliminated by further improvements on the precision of the measurements.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10775061, 10875152, 10875151, 10975064 and 10740420550, the Fundamental Research Fund for Physics and Mathematic of Lanzhou University under Grant No LZULL200805, the Fundamental Research Funds for the Central Universities under Grant No lzujbky-2009-21, the Knowledge Innovation Project of Chinese Academy of Sciences under Grant No KJCX-SYW-N02, and the National Basic Research Program of China under Grant No 2007CB815004.
文摘Theα decay constant is the product of the penetrability P and assault frequency vo in the fission-like model. An effective assault frequency Pv replacing the previous assault frequency uo is introduced for improvement of a fission-like model named the generalized liquid drop model （GLDM） to describe the nuclear α decay process more accurately. Two analytical formulae are proposed for the effective assault frequency due to experimental data within the GLDM. The improved model can be used to give accurate calculations for α decay half-lives.
基金Supported by the Harbin Institute of Technology Research Fund under Grant No.19994028.
文摘The formula for the intensity of surface second-harmonic generation circular dichroism(SHG-CD)in helical molecular films is presented.The influence of the pitch and radius of helical molecules on the surface SHG-CD intensity is numerically analysed.The existence of a peak in curves of the surface SHG-CD intensity versus the pitch and radius is predicted.The relation between the pitch and radius for different azimuthal angles is also discussed.
文摘The nonequilibrium processes of the angular momentum dissipation of fragments in deeply inelastic heavy-ion collisions have been investigated through consideration of the nondiagonal elements of the diffusion tensor.The diffusion tensor has been calculated microscopically.
文摘对“他者”的识别与区分,是人类选择互动方式、建构秩序的前提,但区分的标准和条件则因时因地而千差万别。首先,人是大自然的产物,在瑞典生物学家林奈(Carl von Linne)的分类体系中,人属于动物界、脊索动物门、哺乳纲、灵长目、人科、人属、人种,即相对于自然界其他物种而言,作为生命形态之一的人类具有高度的同质性。然而,在社会领域,人类自身不同群体的分类与归属则要复杂得多。据《圣经》记载,在诺亚洪水消退后的洪荒时代,劫后余生的人们都操着同样的语言,由于能够广泛交流,所以形成了共识,开始修建一座通往天堂的高塔。但这一壮举却冒犯了上帝,上帝认为人类因同心协力而形成的巨大力量挑战了他的神圣权威,于是一夜之间变乱了的语言,使人类因彼此无法交流而疏离隔绝,相互之间冲突不断。其实语言只是群体区分的维度之一,“人的本质是一切社会关系的总和”,地域分布、宗教信仰、经济地位、政治态度、文化习俗、历史记忆等,多向度的聚合与分化,使人类社会的群体类型空前复杂起来。
