The excitation functions of <sup>12</sup>C elastic scattering for <sup>31</sup>P(<sup>12</sup>C,<sup>12</sup>C) reaction at0<sub>c.m.</sub>=158°,132...The excitation functions of <sup>12</sup>C elastic scattering for <sup>31</sup>P(<sup>12</sup>C,<sup>12</sup>C) reaction at0<sub>c.m.</sub>=158°,132°,128°,120° and 98° in the energy region of 11.2-25.1 MeV havebeen measured.Some resonance-like structures appear in the excitation function insub-barrier region of E<sub>c.m.</sub>=15.15,14.18,13.82,13.50,13.17,12.17 and 11.46 MeV.展开更多
共振激发控制技术是提高四极离子阱分辨率、灵敏度，实现其多级质谱分析的关键技术。针对质谱仪小型化趋势，提出基于现场可编程门阵列（filed-programmable gate array，FPGA）软件实现直接数字合成器（direct digital synthesizer，DD...共振激发控制技术是提高四极离子阱分辨率、灵敏度，实现其多级质谱分析的关键技术。针对质谱仪小型化趋势，提出基于现场可编程门阵列（filed-programmable gate array，FPGA）软件实现直接数字合成器（direct digital synthesizer，DDS）信号幅度调制的方法，开发出数字式共振激发控制技术，研制出结构更简单的共振激发控制系统。在对性能要求较高的电喷雾离子源-矩形离子阱质谱仪中，应用这套系统实现了单质荷比选择离子、三级质谱分析和600-2000Thomson质荷比范围的全扫描等功能。相比使用模拟技术实现幅度调制的控制单元，数字式共振激发控制单元的功耗只有其10％，系统性能也满足四极离子阱的需求。展开更多
The production of the hadronic resonances K^＊0（892）,φ（1020）,∑^＊（1385）,and Ξ^＊（1530） in central AA collisions at √SNN=17.3,200,and 2760 GeV is systematically studied.The direct production of these resona...The production of the hadronic resonances K^＊0（892）,φ（1020）,∑^＊（1385）,and Ξ^＊（1530） in central AA collisions at √SNN=17.3,200,and 2760 GeV is systematically studied.The direct production of these resonances at system hadronization is described by the quark combination model and the effects of hadron multiple-scattering stage are dealt with by a ultra-relativistic quantum molecular dynamics model（UrQMD）.We study the contribution of these two production sources to final observation and compare the final spectra with the available experimental data.The pT spectra of K^＊0（892） calculated directly by quark combination model are explicitly higher than the data at low pT≤1.5 GeV,and taking into account the modification of rescattering effects,the resulting final spectra well agree with the data at all three collision energies.The rescattering effect on φ（1020） production is weak and including it can slightly improve our description at low p_T on the basis of overall agreement with the data.We also predict the pT spectra of ∑^＊（1385） and Ξ^＊（1530）,to be tested by the future experimental data.展开更多
Because of the long range disorder of glass structure, that the environment is different for each paramagnetic ion in glasses results in serious inhomogeneous broadening of the spectral lines. So the spectral lines ac...Because of the long range disorder of glass structure, that the environment is different for each paramagnetic ion in glasses results in serious inhomogeneous broadening of the spectral lines. So the spectral lines actually obtained are an envelope of resonant lines of ions located in different sites. In the ESR study of transition metal ions, the over-broadening of the spectral lines has long since brought difficulties to our展开更多
基金The project supported by the National Natural Science Foundation of China.
文摘The excitation functions of <sup>12</sup>C elastic scattering for <sup>31</sup>P(<sup>12</sup>C,<sup>12</sup>C) reaction at0<sub>c.m.</sub>=158°,132°,128°,120° and 98° in the energy region of 11.2-25.1 MeV havebeen measured.Some resonance-like structures appear in the excitation function insub-barrier region of E<sub>c.m.</sub>=15.15,14.18,13.82,13.50,13.17,12.17 and 11.46 MeV.
文摘共振激发控制技术是提高四极离子阱分辨率、灵敏度，实现其多级质谱分析的关键技术。针对质谱仪小型化趋势，提出基于现场可编程门阵列（filed-programmable gate array，FPGA）软件实现直接数字合成器（direct digital synthesizer，DDS）信号幅度调制的方法，开发出数字式共振激发控制技术，研制出结构更简单的共振激发控制系统。在对性能要求较高的电喷雾离子源-矩形离子阱质谱仪中，应用这套系统实现了单质荷比选择离子、三级质谱分析和600-2000Thomson质荷比范围的全扫描等功能。相比使用模拟技术实现幅度调制的控制单元，数字式共振激发控制单元的功耗只有其10％，系统性能也满足四极离子阱的需求。
基金Supported by National Natural Science Foundation of China(11575100,11305076,11505104)
文摘The production of the hadronic resonances K^＊0（892）,φ（1020）,∑^＊（1385）,and Ξ^＊（1530） in central AA collisions at √SNN=17.3,200,and 2760 GeV is systematically studied.The direct production of these resonances at system hadronization is described by the quark combination model and the effects of hadron multiple-scattering stage are dealt with by a ultra-relativistic quantum molecular dynamics model（UrQMD）.We study the contribution of these two production sources to final observation and compare the final spectra with the available experimental data.The pT spectra of K^＊0（892） calculated directly by quark combination model are explicitly higher than the data at low pT≤1.5 GeV,and taking into account the modification of rescattering effects,the resulting final spectra well agree with the data at all three collision energies.The rescattering effect on φ（1020） production is weak and including it can slightly improve our description at low p_T on the basis of overall agreement with the data.We also predict the pT spectra of ∑^＊（1385） and Ξ^＊（1530）,to be tested by the future experimental data.
文摘Because of the long range disorder of glass structure, that the environment is different for each paramagnetic ion in glasses results in serious inhomogeneous broadening of the spectral lines. So the spectral lines actually obtained are an envelope of resonant lines of ions located in different sites. In the ESR study of transition metal ions, the over-broadening of the spectral lines has long since brought difficulties to our
