Two-proton emissions from the excited states of 17,18Ne, 28P and 28,29S were investigated experimentally by the radioactive beams bombarding on the 197Au target via the Coulomb excitation. The complete-kinematics meas...Two-proton emissions from the excited states of 17,18Ne, 28P and 28,29S were investigated experimentally by the radioactive beams bombarding on the 197Au target via the Coulomb excitation. The complete-kinematics measurements were actualized by the stacks of silicon-strip detectors and CsI+PIN array detectors. The invariant mass of final systems as well as the relative momentum, opening angle, and relative energy of the two emitted protons was reconstructed under the framework of relativ istic kinematics. Visible proton-proton correlations were observed in these systems. The mechanisms of two-proton emission were analyzed in a simple schematic model, in which the extreme decay modes like He cluster emission, three-body 2 phase-space decay, and two-body sequential decay were taken into account. With the help of Monte-Carlo simulations, the two protons emitted from the 6.15 MeV excited state of Ne and the excited states in the energy region of 9.6–10.4 MeV of S, 18 29 respectively, exhibited prominent features of2 He cluster decay while for the other cases, no obvious diproton emissions were observed.展开更多
A new transuranium neutron-deficient isotope 235Am was produced by 35 MeV proton to bombard the rare radioactive 238Pu target The products were transported and collected by the He-jet system. The Am isotopes were sepa...A new transuranium neutron-deficient isotope 235Am was produced by 35 MeV proton to bombard the rare radioactive 238Pu target The products were transported and collected by the He-jet system. The Am isotopes were separated and purified by radiochemtstry method and the γ-ray, X-ray and γ-X(γ) coincidence of the samples was measured The synthesis of 235 Am was definitely identified Its measured half-life is (15±5) mom.展开更多
The power supply for dipole and 30 power supplies for quadruple of CSRm had been put into operation since the first commissioning in January. And the other smaller power supplies (PS) for correctors had been prepared ...The power supply for dipole and 30 power supplies for quadruple of CSRm had been put into operation since the first commissioning in January. And the other smaller power supplies (PS) for correctors had been prepared later. 14 new power supplies for 7 sets double corrector magnet were announced in March, our provider had to manufacture them in three months. The 14 sets power supplies were installed before the June. The best problems we meet this year are the precision of quadruple power supply. In October, we found there was difference between the output and reference. So we spent about one month to展开更多
In this paper,A MySAS package,which is verified on Windows XP,can easily convert two-dimensional data in small angle neutron and X-ray scattering analysis,operate individually and execute one particular operation as n...In this paper,A MySAS package,which is verified on Windows XP,can easily convert two-dimensional data in small angle neutron and X-ray scattering analysis,operate individually and execute one particular operation as numerical data reduction or analysis,and graphical visualization.This MySAS package can implement the input and output routines via scanning certain properties,thus recalling completely sets of repetition input and selecting the input files.On starting from the two-dimensional files,the MySAS package can correct the anisotropic or isotropic data for physical interpretation and select the relevant pixels.Over 50 model functions are fitted by the POWELL code using x^2 as the figure of merit function.展开更多
In recent years,multinucleon transfer reactions have attracted significant attention for their potential to synthesize new exotic nuclei.These nuclei are difficult to be produced in fusion-evaporation reactions and fr...In recent years,multinucleon transfer reactions have attracted significant attention for their potential to synthesize new exotic nuclei.These nuclei are difficult to be produced in fusion-evaporation reactions and fragmentation processes due to the extremely small production cross sections and/or the lack of appropriate projectile-target combinations.In the early 1970s,multinucleon transfer reactions have been used for the production of the light neutron-rich isotopes [1].展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos. 10675169, 10735100, and 10727505)the Major State Basic Research Developing Program (Grant No. 2007CB815003)
文摘Two-proton emissions from the excited states of 17,18Ne, 28P and 28,29S were investigated experimentally by the radioactive beams bombarding on the 197Au target via the Coulomb excitation. The complete-kinematics measurements were actualized by the stacks of silicon-strip detectors and CsI+PIN array detectors. The invariant mass of final systems as well as the relative momentum, opening angle, and relative energy of the two emitted protons was reconstructed under the framework of relativ istic kinematics. Visible proton-proton correlations were observed in these systems. The mechanisms of two-proton emission were analyzed in a simple schematic model, in which the extreme decay modes like He cluster emission, three-body 2 phase-space decay, and two-body sequential decay were taken into account. With the help of Monte-Carlo simulations, the two protons emitted from the 6.15 MeV excited state of Ne and the excited states in the energy region of 9.6–10.4 MeV of S, 18 29 respectively, exhibited prominent features of2 He cluster decay while for the other cases, no obvious diproton emissions were observed.
基金Project supported by the National Natural Science Foundation of China and the Chinese Academy of Sciences
文摘A new transuranium neutron-deficient isotope 235Am was produced by 35 MeV proton to bombard the rare radioactive 238Pu target The products were transported and collected by the He-jet system. The Am isotopes were separated and purified by radiochemtstry method and the γ-ray, X-ray and γ-X(γ) coincidence of the samples was measured The synthesis of 235 Am was definitely identified Its measured half-life is (15±5) mom.
文摘The power supply for dipole and 30 power supplies for quadruple of CSRm had been put into operation since the first commissioning in January. And the other smaller power supplies (PS) for correctors had been prepared later. 14 new power supplies for 7 sets double corrector magnet were announced in March, our provider had to manufacture them in three months. The 14 sets power supplies were installed before the June. The best problems we meet this year are the precision of quadruple power supply. In October, we found there was difference between the output and reference. So we spent about one month to
基金Supported by Science and Technology Foundation of China Academy of Engineering Physics(No.2010A0103002)Innovation Foundation of Institute of Nuclear Physics and Chemistry,CAEP(No.2009CX01)
文摘In this paper,A MySAS package,which is verified on Windows XP,can easily convert two-dimensional data in small angle neutron and X-ray scattering analysis,operate individually and execute one particular operation as numerical data reduction or analysis,and graphical visualization.This MySAS package can implement the input and output routines via scanning certain properties,thus recalling completely sets of repetition input and selecting the input files.On starting from the two-dimensional files,the MySAS package can correct the anisotropic or isotropic data for physical interpretation and select the relevant pixels.Over 50 model functions are fitted by the POWELL code using x^2 as the figure of merit function.
基金National Natural Science Foundation of China(11305272)Specialized Research Fund for Doctoral Program of Higher Education(20130171120014)+1 种基金Guangdong Natural Science Foundation(2014A030313217)Pearl River S&T Nova Program of Guangzhou(201506010060)~~
基金the National Natural Science Foundation of China(Grant Nos.11975237,and 11575189)the NSFC-JSPS International Cooperation Program(Grant No.11711540016).
文摘In recent years,multinucleon transfer reactions have attracted significant attention for their potential to synthesize new exotic nuclei.These nuclei are difficult to be produced in fusion-evaporation reactions and fragmentation processes due to the extremely small production cross sections and/or the lack of appropriate projectile-target combinations.In the early 1970s,multinucleon transfer reactions have been used for the production of the light neutron-rich isotopes [1].
