2010, 27(1): 92-96.
doi: 10.11804/NuclPhysRev.27.01.092
Published:2010-03-20
Monocrystalline silicon(cSi), thin films of amorphous silicon(aSi) and nanocrystalline silicon(ncSi) were irradiated at room temperature(RT) by using 94 MeV Xeions at 1.0×1011, 1.0×1012 or 1.0×1013 Xeions/cm2, respectively. All samples were analyzed at RT by an UV/VIS/NIR spectrometer (Lambda 900, PE, Germany), and then the uariation of the optical bandgap with the irradiation fluence was investigated systematically. The results show that the optical bandgap of the silicon samples irradiates by Xeion changed dramatically with different crystalline structures. For the aSi thin films, the optical bandgap values decreased gradually from ~1.78 to ~1.54 eV with increasing Xeion irradiation fluence. For the ncSi thin films, the optical bandgap values increased sharply from ~1.50 (origin) to ~1.81 eV(Φ=1.0×1012ions/cm2), and then decreased to ~1.67 eV(Φ=1.0×1013 ions/cm2). However, there is no observable change of the optical bandgap of the cSi after Xeion irradiations. Possible mechanism on the modification of the silicon thin films was briefly discussed.
2008, 25(3): 232-235.
doi: 10.11804/NuclPhysRev.25.03.232
Published:2008-09-20
Keywords:
nuclear density model ,
nuclear density empirical formula of nucleus ,
binding energy ,
l-A DIS process
The nuclear effect functions in lA DIS process RHe/D(x, Q2), RLi/D(x, Q2), RC/Li(x, Q2) and RCa/Li(x, Q2) are calculated on the basis of the nuclear density model by using nuclear densities obtained from an empirical formula or the experimental values of the electromagnetic mean of radius square 〈r2〉, respectively.It is shown that the nuclear effect functions obtained from the empirical formula are in good agreement with the NMC experimental data, and better than the later ones.The empirical formula of the nuclear density can be used to study the nuclear effect of nucleon structure functions reasonably.
2009, 26(1): 80-83.
doi: 10.11804/NuclPhysRev.26.01.080
Published:2009-03-20
To study the effects of radiation sterilization of the electron beam, the three species of microorganisms, Escherichia. coli, Staphylococcus aureus and Proteus vulgaris were irradiated with the electron beam, delivered by the electron accelerator independently developed by the Institute of Modern Physics, Chinese Academy of Sciences, and the changes of superoxide dismutase (SOD) activity of these irradiated microorganisms were also tested. The results indicated that the Staphylococcus aureus were fully radiosterilized with the radiation dosage of 2.0 kGy, but 2.2 kGy to the Escherichia.coli and Proteus vulgaris. Moreover, the data also demonstrated that the irradiation had noticeable effects on the SOD activity of the three microorganisms.
2007, 24(2): 160-163.
doi: 10.11804/NuclPhysRev.24.02.160
Published:2007-06-20
A semiemperical molecular dynamics model was developed. The central collisions of C60 +C60 and Ar@C60 +Ar@C60 at the same incident energy were investigated within this model. The fullerene dimers could be formed by a selfassembly of C60 fullerene, and the new fullerene structure like “peanut” could be formed by a selfassembly of Ar@C60 . It was found that atom Ar had a great effect on the collision of Ar@C60 +Ar@C60 .