Excited states in 195 Au have been studied experimentally via the 192 Os( 7 Li, 4n) reaction at a beam energy of 44 MeV. Based on the γ -γ -t coincidence measurement, a level scheme consisting of 15 new transitions and 10 new levels is established for 195 Au. The triaxial shape-polarizing effect of the high-j h 11/2 proton hole was studied by total Routhian surface calculations. By comparing with the level structures in the odd-A Au isotopes and the even-even core Hg nuclei, configurations are proposed to the rotational bands and three-quasiparticle states observed in 195 Au.

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The cross sections of complete fusion and incomplete fusion for the 9 Be + 197 Au system, at energies not too much above the Coulomb barrier, were measured for the first time. The online activation followed by an offline γ-ray spectroscopy method was used for the derivation of the cross sections. A slightly higher value of the incomplete fusion to total fusion ratio has been observed, compared to other systems reported in the literature with a 9 Be beam. The experimental data were compared with coupled channel calculations without taking into account the coupling of the breakup channel, and experimental data of other reaction systems with weakly bound projectiles. A complete fusion suppression of about 40% was found for the 9 Be + 197 Au system, at energies above the barrier, whereas the total fusion cross sections are in agreement with the calculations. PACS numbers:

The isomer yield ratios of 184 Re in the incomplete fusion of the 9 Be + 181 Ta system were measured at energies around the Coulomb barrier, using online activation followed by offline γ-ray spectroscopy method. The PLATYPUS code that is based on a classical dynamical model is employed to analyze the measurements. By applying a phenomenological approach, model calculation managed to fairly reproduce the order of magnitude of the yield ratios at above barrier energies. Through the study, it is shown that the PLATYPUS code in conjunction with a phenomenological analysis can provide a reasonable explanation of isomer yield ratios resulted from incomplete fusion of weakly bound projectiles.

We report a quantitative measurement of the pressure effect on melting point elevation of encapsulated nanoparticles without epitaxial interfaces. By means of in situ x-ray diffraction, a substantial melting point elevation of about 15 K in encapsulated Al nanoparticles in Al 2 O 3 shells without epitaxial interfaces was observed. Meanwhile, a pressure buildup of about 0.25 GPa on the Al nanoparticles was determined due to constraint of the rigid Al 2 O 3 shell. The correlation between the measured pressure and melting point elevation in the present system verified that the observed melting point elevation is a pressure-induced phenomenon and the pressure effect on melting point for encapsulated nanoparticles follows the rule for bulk solids.

The beam power of the CEPC Collider is about 60 MW, so an efficiency of an RF power source is very important for cost of project implementation. The most popular source for an accelerator is a klystron, which has the advantage that it can be operated at high power with a reasonable high efficiency. IHEP is developing 650 MHz klystron with 800 kW CW output power and 80% efficiency. To reach this goal, a couple of klystron prototypes will be manufactured in the near future. The first prototype is completely manufactured by Institute of Electronics (IE) and GLVAC Company and the first step of high-power conditioning and commissioning is also completed in IHEP. The design schemes of high-efficiency klystron are also in progress.

We report on an isomer yield ratio study of biologically important 94 Tc following the fusion of the 9 Be + 89 Y system, carried out using the offline γ-ray spectroscopy in continuation to the online activation method. The incident beam energies considered are above the Coulomb barrier for the present study. The PLATYPUS model in conjunction with a potential model calculation was employed to analyze the data. An agreement in the order of magnitude between the experimental data and theoretical predictions has been achieved, by applying a phenomenological approach. The approach was further tested with isomer yield ratios of 94 Tc formed through 3 He + 93 Nb reactions. Possible factors that relate to the isomer yield ratios are also presented.

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