共查询到18条相似文献,搜索用时 15 毫秒
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R. Collatz P. Kleinheinz C. T. Zhang A. F. Saad C. Vieu J. S. Dionisio C. Schück M. Wilhelm P. von Brentano R. Wirowski J. Blomqvist 《Zeitschrift für Physik A Hadrons and Nuclei》1995,352(3):245-246
High-spin states of115Sb were studied by inbeamγ-ray spectroscopy using the89Y (29Si, 2pn) fusionevaporation reaction at a beam energy of 108 MeV. The experiments includedγ-γ coincidence and directional correlation of oriented nuclei (DCO) ratio measurements using six BGO Compton suppressed Ge detectors. An intruderΔJ=2 rotational band has been identified for the first time and it is interpreted as the h11/2 proton coupled to a two particle-two hole (2p ? 2h) deformed state of the114Sn core. A ΔJ=1 rotational band based on the 2p ? 1h, π{g 7 2/2 ?g 9 2/?1 }, configuration has been extended to the 29/2+ state at an excitation energy of 5241 keV. 相似文献
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M. Kmiecik A. Maj A. Bracco F. Camera B. Million B. Herskind 《Acta Physica Hungarica A》2001,13(1-3):179-183
Results from the measurement of the GDR built on excited states of the 147Eu compound nucleus are presented. Data corresponding to restricted regions of angular momenta and more selected data, associated with different residual nuclei are discussed. The behaviour of the GDR width, measured as a function of nuclear spin and temperature, is well described by the predictions of the thermal shape fluctuation model. 相似文献
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MA Fei ZHOU Xiao-Hong ZHENG Yong XU Shu-Wei XIE Yuan-Xiang CHEN Liang ZHANG Yu-Hu LI Zhan-Kui QIANG Yun-Hua LEI Xiang-Guo GUO Ying-Xiang GUO Song DING Bing WANG Hai-Xia LI Guang-Shun ZHOU Hou-Bing 《中国物理快报》2010,27(6):59-61
The β-delayed proton decay of 147Er is studied experimentally using the 58 Ni+92Mo reaction at a beam energy of 383 MeV. Based on a He-jet apparatus coupled with a tape transport system, the β-delayed proton radioactivities both from the vδl/2 ground state and the vh11/2 isomer in 147 Er are identified by proton-7 coincidence measurements. By analyzing the time distribution of the 4+ → 2+-γ transition in the grand-daughter nucleus 146Dy, a half-life of 1.6 ± 0.2s is determined for the Vh11/2 isomer in 147 Er. The half-life for the ground state of 147Er is estimated to be 3.2±1.2 s. 相似文献
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在壳模型的基础上系统研究了146Gd区A=147-153核的Gamow-Teller跃迁.这些相对146Gd核心为粒子态的核唯一的β允许衰变道为π1h11/2→v1h9/2的Gamow-Teller跃迁.计算结果表明,实验的约化几率B(GT)与计算的B(GT)比较,存在一个阻塞因子γ2,即γ2=Bexp(GT)/Bcal(GT)=0.17±0.05. 相似文献
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Shock wave experiments were carried out to measure the electrical resistivity of fluid methane. The pressure range of 89–147?GPa and the temperature range from 1800 to 2600?K were achieved with a two-stage light-gas gun. We obtained a minimum electrical resistivity value of 4.5?×?10?2?Ω?cm at pressure and temperature of 147?GPa and 2600?K, which is two orders of magnitude higher than that of hydrogen under similar conditions. The data are interpreted in terms of a continuous transition from insulator to semiconductor state. One possibility reason is chemical decomposition of methane in the shock compression process. Along density and temperature increase with Hugoniot pressure, dissociation of fluid methane increases continuously to form a H2-rich fluid. 相似文献
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利用化学腐蚀法在光纤包层表面成功制备了调制深度为3.9%的单壁碳纳米管饱和吸收体.组建了环形腔结构的全光纤掺铒光纤激光器,以制备的单壁碳纳米管薄膜为锁模元件,利用倏逝场锁模实现了锁模输出.锁模脉冲的中心波长为1556 nm,3 dB光谱带宽为24 nm,脉冲宽度为147 fs,重复频率为150 MHz.在520mW抽运功率下,平均输出功率为21 mW,相应的单脉冲能量为0.14 nJ. 相似文献
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以高纯ZnS粉末为基质,采用高温转相、扩散,以及表面涂敷工艺,制得了147Pm激发的ZnS:Cu,Cl发光粉。分析了ZnS:Cu,Cl的晶体结构,测量了ZnS:Cu,Cl的激发光谱、发射光谱、发光亮度。其晶体结构主要是六方纤锌矿型结构,激发光谱峰值波长为341nm,发射光谱峰值波长为513nm,初始发光亮度达到312mcd/m2。由激发光谱的峰值波长341nm推算得到六方ZnS晶体的禁带宽度为3.64eV。分析了147Pm激发的ZnS:Cu,Cl发光粉的发光寿命,其发光寿命达到5年以上。还探讨了该放射性发光粉的发光机理。147Pm激发的ZnS:Cu,Cl的稳定发光,实际上是激发过程与复合过程的准平衡。ZnS:Cu,Cl的绿色发光来源于深施主-深受主对的复合发射。实验结果的分析表明,ZnS:Cu,Cl中深施主-深受主之间的能级间隔约为2.42eV。 相似文献
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以高纯ZnS粉末为基质,采用高温转相、扩散,以及表面涂敷工艺,制得了147Pm激发的ZnS∶Cu,Cl发光粉。分析了ZnS∶Cu,Cl的晶体结构,测量了ZnS∶Cu,Cl的激发光谱、发射光谱、发光亮度。其晶体结构主要是六方纤锌矿型结构,激发光谱峰值波长为341nm,发射光谱峰值波长为513nm,初始发光亮度达到312mcd/m2。由激发光谱的峰值波长341nm推算得到六方ZnS晶体的禁带宽度为3.64eV。分析了147Pm激发的ZnS∶Cu,Cl发光粉的发光寿命,其发光寿命达到5年以上。还探讨了该放射性发光粉的发光机理。147Pm激发的ZnS∶Cu,Cl的稳定发光,实际上是激发过程与复合过程的准平衡。ZnS∶Cu,Cl的绿色发光来源于深施主-深受主对的复合发射。实验结果的分析表明,ZnS∶Cu,Cl中深施主-深受主之间的能级间隔约为2.42eV。 相似文献
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J. Kvitek J. Hoffmann J. Cervena J. Vacik F. Becvar Yu. P. Popov 《Zeitschrift für Physik A Hadrons and Nuclei》1980,295(2):197-198
Through (p,2n) in-beam γ and e? measurements the excitation of the 235 μs 9+ isomer in146Eu has been determined to be 666.3 keV. High spin members of the πd 5 2/?1 νf7/2 and πg 7 2/?1 νf7/2 particle hole multiplets populated in the isomeric decay were located. 相似文献
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《Optics Communications》2002,201(1-3):1-3
Incorrect statements and assumptions undermining the validity of the results presented in the above paper are pointed out and shortly discussed. It is stressed that a proper `coarse graining' of a Wigner phase-space distribution function cannot be in general performed over finite phase-space cells and that any `smearing' over infinite phase-space areas cannot violate the respective uncertainty relations, which furnishes an answer to the question asked in the title. 相似文献
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Anna L. Gould C. Richard A. Catlow Andrew J. Logsdail 《The European Physical Journal B - Condensed Matter and Complex Systems》2018,91(2):32
Density functional theory calculations have been performed to investigate the use of CO as a probe molecule for the determination of the structure and composition of Au, Ag and AuAg nanoparticles. For very small nanoclusters (x = 1 ? 5), the CO vibrational frequencies can be directly correlated to CO adsorption strength, whereas larger 147-atom nanoparticles show a strong energetic preference for CO adsorption at a vertex position but the highest wavenumbers are for the bridge positions. We also studied CO adsorption on Au and Ag (100) and (111) surfaces, for a 1 monolayer coverage, which proves to be energetically favourable on atop only and bridge positions for Au (100) and atop for Ag (100); vibrational frequencies of the CO molecules red-shift to lower wavenumbers as a result of increased metal coordination. We conclude that CO vibrational frequencies cannot be solely relied upon in order to obtain accurate compositional analysis, but we do propose that elemental rearrangement in the core@shell nanoclusters, from Ag@Au (or Au@Ag) to an alloy, would result in a shift in the CO vibrational frequencies that indicate changes in the surface composition. 相似文献