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2004 Vol. 21, No. 1

Nuclear Physics
Scaling Laws of Nuclear Halos
LIU Zu-hua, ZHANG Xi-zhen, ZHANG Huan-qiao
2004, 21(1): 1-5. doi: 10.11804/NuclPhysRev.21.01.001
Abstract(2074) PDF (160KB)(672)
Abstract:
We have extracted the probability for a valence particle being out the binding potential, as well as the rootmeansquare radius of the probability distribution from the measured nuclear asymptotic normalization coefficients. According to the criterion of nuclear halo, i.e., the valence particle has larger than 50% probability being out of the nuclear binding potential, a number of halo nuclei have been confirmed. Based on these results, we have obtained a very relaxed condition for nuclear halo formation. In addition, a number of nuclear halo candidates have been analyzed with the criteria of 〈r2〉/R2≥1.5 and 〈r2〉1/2/rc≥2.0. Furthermore, we present the scaling laws for the dimensionless quantity 〈r2〉/R2 of the nuclear halo in terms of an analytical expressions of the expectation value for the operator r2 in a finite squarewell potential.
Studies on Abnormalparity Energy Spectra of Nuclei
XU Yan-bing
2004, 21(1): 6-11. doi: 10.11804/NuclPhysRev.21.01.006
Abstract(2002) PDF (179KB)(528)
Abstract:
Using modified surface delta interaction, enlarging the fp configuration space to include the 1g9/2 orbit with the abnormalparity, the deformed HartreeFock calculations for the eight nuclei: 64Ge, 66Ge, 68Ge, 70Se, 72Se , 74Se, 76Kr and 78Kr are performed. The groundstate and some particlehole excited configurations are obtained. The approximate angular momentum projected deformed HartreeFock (PDHF) method is applied to even even nuclei 64Ge and 74Se and oddA nuclus 79Kr. Both of their normal and abnormalparity bands are obtained. The calculated energy spectra are consistent well with experimental spectra.
ALICE/PHOS Photon Discrimination Simulation
ZHOU Jing, MENG Qiu-ying, LI Xiao-mei, ZHOU Shu-hua
2004, 21(1): 12-16. doi: 10.11804/NuclPhysRev.21.01.012
Abstract(1666) PDF (178KB)(541)
Abstract:
The photon discrimination power of the ALICE photon spectrometer is simulated for incident particles n, p,π+, K+and γ with random energy distribution in the range from 0.5 to 100 GeV. The pricipale component analysis method is used to reduce the number of parameters in the shower shape analysis, and the results are compared with that from the seven parameter topology analysis.The efficiency dependence of purity for the photon discrimination is obtained for the deposited energy range 0.5—10, 10—20, 20—50 and 50—100 GeV.
A Large Area PPAC for Using in Tumor Therapy with Heavy Ions
HU Zheng-guo, GUO Zhong-yan, ZHAN Wen-long, XIAO Guo-qing, XU Hu-shan, WANG Meng, MAO Rui-shi, Li Jia-xing, SUN Zhi-yu, CHEN Zhi-qiang, CHEN Li-xin, BAI Jie, LI Chen, ZHANG Jin-xia, LI Cun-fan
2004, 21(1): 17-20. doi: 10.11804/NuclPhysRev.21.01.017
Abstract(1914) PDF (152KB)(702)
Abstract:
he principle of the heavyion therapy is introduced in this article. In order to precisely determine the irradiation profiles and positions of scanned heavyion beams, we developed a large area parallel plate avalanche counter(PPAC). The detector consists of one anode, two cathodes and two windows with 250 mm×250 mm active area . It was measured at an anode voltage of 700 V and with flowing C3F8 gas at the pressure of 700 Pa. A position resolution of 0.54 mm by correction was obtained with an αsource. As compared with the similar devices, we consider the position resolution of the PPAC can satisfy the requirement of the facility of heavyion therapy.
Accelerator
Diagnosis and Application of Compton Backscattering Technigue in Storage Ring for Electron BeamFoundation item:Major Subject of Chinese Academy of sciences II Measurements of Polarization of Electron Beam in Storage Ring
GU Jia-hui, CAI Xiang-zhou, GUO Wei, SHEN Wen-qing
2004, 21(1): 21-25. doi: 10.11804/NuclPhysRev.21.01.021
Abstract(2215) PDF (190KB)(630)
Abstract:
The Compton backscattering polarimeter is described briefly on the basis of the principle of Compton backscattering in this paper. The polarization of the electron beam can be measured and monitored on time and nondestructively. The project will be one of applications of low energy γray beam of SLEGS.
Experiments and Researches on Production of Highly Charged Metallic Ions in ECR Ion Source
CAO Yun, MA Lei, SUN Liang-ting, ZHANG Zi-ming, ZHAO Hong-wei, MA Bao-hua
2004, 21(1): 26-29. doi: 10.11804/NuclPhysRev.21.01.026
Abstract(1870) PDF (158KB)(667)
Abstract:
To satisfy the requirements of HIRFL (Heavy Ion Research Facility in Lanzhou), series of experiments have been done to produce metallic ion beams. By now, numerous methods have been tested, in which MIVOC (Metallic Ion from Volatile Compounds), heating oven methods and plasma sputter methods are all included. According to the experiments, the results of using MIVOC methods and heating oven methods are very good. In most of our researches, emphasis was put upon the ion production of iron, Nickel, Tantanum, copper of different charge states. Among the ion beams we have obtained, 210 μA Fe11+, 175 μA Fe12+, 142 μA Fe13+, 25 μA Fe16+, 64 μA Ni10+, 57 μA Ni13+, 31 μA Ni15+ and 15 μA Ni16+ are representative results.
Study of Design and Test of Schottky Pick up
CHEN Li-xin, XIAO Guo-qing, GUO Zhong-yan, ZHAN Wen-long, SUN Zhi-yu, LI Jia-xing, WANG Meng, MAO Rui-shi, CHEN Zhi-qiang, BAI Jie, HU Zheng-guo, LI Chen
2004, 21(1): 30-33. doi: 10.11804/NuclPhysRev.21.01.030
Abstract(1916) PDF (164KB)(639)
Abstract:
he mass measurement of the nuclides far from the β stability by using Schottky mass spectrometry is an important aspect of the studies on HIRFLCSR. The principle of Schottky pickup and the method and prospect of Schottky mass spectrometry are also briefly analyzed. The Schottky pickup designed for the system of diagnostics and measurement of HIRFLCSR and also the test results are given.
Application of HTS in Pulsed Ion Beam of Sccelerator and Study on Secondary Ion Emission of Hydrogen from Carbon Nanotubes under Bombardments of MeV Si and Si2 Clusters
DING Fu-rong, SHI Ping, WANG Yao, NIE Rui, SHEN Ding-yu, MA Hong-ji
2004, 21(1): 34-37. doi: 10.11804/NuclPhysRev.21.01.034
Abstract(1835) PDF (169KB)(628)
Abstract:
The application of Fast High Voltage Transistor Switches (HTS) in pulsed ion beam and the time of flight(TOF ) setup is described. Secondary ion emissions from carbon nanotubes under bombardments of MeV Si and Si2 clusters are measured by using TOF. The measurements indicate that the yield of the secondary ion emissions of hydrogen increases with increasing energy of Si and it is attributed to the electronic processes. The yield of the secondary ions of hydrogen decreases with increasing energy of Si2 clusters and the enhancement of nuclear energy loss of cluster constituents at the surface of sample plays a more significant role in the secondary ion emission of hydrogen at the low energies.
Cross Discipline
Detection of Superimposed Periodic Variation of 1—10 TeV Cosmic Ray Using Wavelets
LIU Jun, JIA Huan-yu, HUANG Qing
2004, 21(1): 38-42. doi: 10.11804/NuclPhysRev.21.01.038
Abstract(2096) PDF (178KB)(703)
Abstract:
We use the technique of wavelet analysis and epoch folding methods to search for the superimposed periodic signals of 1—10 TeV cosmic ray in the data obtained with Tibet Ⅱ/HD AS Array for April to June of 1998. Solar time semidiurnal and diurnal variations have been detected with about signalnoise ratio 10 and 6 for the 1 TeV and 10 TeV cosmic ray flux respectively. The semidiurnal variations are of an amplitude 0.3%, a phase 0.9 for 1 TeV cosmic ray and 0.4%, 0.9 for 10 TeV. The diurnal variations are of amplitude 0.5%, 0.7%, and phase 0.8 for 1 TeV and 10 TeV cosmic ray respectively.
Irradiation Effects in PET Films Induced by 22 MeV/u Fe Ions
WANG Ying, ZHU Zhi-yong, SUN You-mei, JIN Yun-fan, WANG Zhi-guang, HOU Ming-dong, DUAN Jing-lai
2004, 21(1): 43-47. doi: 10.11804/NuclPhysRev.21.01.043
Abstract(1949) PDF (219KB)(681)
Abstract:
Semicrystalline polyethylene terephthalate (PET) film stacks were irradiated with 22 MeV/u Fe ions at room temperature under vacuum. Ion beam induced microscopic structural modifications and amorphous transformation were investigated by means of Fourier transform infrared spectrosocopy (FTIR), ultraviolet visible absorption spectrosocopy (UV/Vis) and Xray diffractometer (XRD). It was found that irradiation induces bond breaking, formation of new free radiculs and amorphous transformation. These effects were found to depend on ion fluence , the electronic energy loss and aborbed dose. The creation of alkyne groups was found only at the aborbed dose higher than 5.0 MGy.
Study on Ionizing Radiation Induced Bystander Effects
WANG Ju-fang, LI Wen-jian
2004, 21(1): 48-52. doi: 10.11804/NuclPhysRev.21.01.048
Abstract(2292) PDF (240KB)(625)
Abstract:
Recent studies have indicated that biological effects, such as chromosomal aberration, gene mutation and cell death and so on, can be induced in cells that are not traversed by radiation directly. This phenomenon has been termed as bystander effects. In this paper, a few representative studies were reported and the possible mechanisms underlying the bystander effects were summarized. The reactive oxygen species (ROS) induced by ionizing radiation, cellular communication and some factors play important roles. Besides, the expression extent of bystander effects depended on radiation dose and quality were discussed. Bystander effects suggest that potential health risks associated with radiation exposure may be greater than those of original thought and this makes ultimate impact on human radiation risk assessment.
Biological Effectiveness in A172 Glioma Cells by γ ray Irradiation
ZHAO Jing, LI Wen-jian, GAO Qing-xiang, WANG Ju-fang, MAO Shu-hong, XIA Jing-guang, YANG Jian-she
2004, 21(1): 53-55. doi: 10.11804/NuclPhysRev.21.01.053
Abstract(1715) PDF (131KB)(600)
Abstract:
To study the biological effectiveness in A172 glioma cells induced by γray irradiation, the survival fraction and the micronucleus frequency of A172 cells was measured. The result showed that the survival fraction was negatively correlated to the radiation dose. At 1.0 Gy, the micronucleus frequency peaked about (66.75±3.564)%, and the frequency of micronucleus cells peaked about (53.9 ±0.784 9)%. As the radiation dose increasing, the micronucleus frequency and the frequency of micronucleus cells decreased and finally kept steady about 42% and 37%, respectively.
Nuclear Reaction Method for Measurement of Protein Content in Seed of Grain
LUO Xiao-bing, ZHANG Ruan-yu, CHEN Shi-guo, LI Tai-hua, AN Zhu, CAO Yang-shu, HE Fu-qing, PENG Xiu-feng
2004, 21(1): 56-59. doi: 10.11804/NuclPhysRev.21.01.056
Abstract(1990) PDF (155KB)(764)
Abstract:
The requirements of the screening method for high protein content in grain breeding are analysed. Methods for the determination of protein content in grain seed are reviewed.The principle and the advantages of the nuclear reaction method for the measurement of protein content in grain seed are discussed in detail.
Nonlinearity Effects on Width of Spectral Line of Channeling Radiations
WEI Luo-xia, LUO Shi-yu, CHEN Shao-wen
2004, 21(1): 60-64. doi: 10.11804/NuclPhysRev.21.01.060
Abstract(1821) PDF (154KB)(532)
Abstract:
The spectral properties of the planar channeling radiation of positron have been investigated by using Sinesquared Potential. At positron energy of 5 GeV a sharp line has been explained for the planar channeling radiation in Si(110 ). It is that theoretic results are compatible to the experiments.
Intercombination Transitions 3s3p 3P1—3s21S0 in Magnesium like Ions through KⅧ to TbLⅣ
MU Zhi-dong, WEI Qi-ying
2004, 21(1): 65-69. doi: 10.11804/NuclPhysRev.21.01.065
Abstract(2017) PDF (187KB)(595)
Abstract:
We have calculated the energy levels of 3s3p3P1 for magnesiumlike sequence ions from KⅧ—TbLⅣ by HXR (HartreeForck plus statisticalexchange potential with relativistic corrections) method. With the important effects taken into account, we have made a systematic fit for the energy levels of the ions mentioned above. We predicted here the energy levels which have not been observed in experiments for ions from KⅧ to TbLⅣ.The wavelengths, oscillator strengths and probabilities of intercombination transitions 3s3p 3P1—3s21S0 are computed too.
Nuclear Energy and Nuclear Data File
Nuclear Data Sensitivity of Minor Actinides on Accelerator driven Burner System
LIU Ping, ZHAO Zhi-xiang
2004, 21(1): 70-72. doi: 10.11804/NuclPhysRev.21.01.070
Abstract(1950) PDF (117KB)(554)
Abstract:
In order to investigate the effect of minior actinide data on integral parameter, the acceleratordriven minior actinide benchmark system was selected in this work. The library based on ENDF/BVI.2 was used for the reference calculation. The sensitivities were examined by exchanging the minior actinides of CENDL3.0 and JENDL3.2 one after another. The Keff values and reaction rates were calculated. According to the comparisons, the difference in Keff from the refrence is more than 3‰, and the fission reaction rate of 242Am is about 15% lower than those of reference results. The elastic scattering reaction rate of 238Pu of CENDL3.0 is about 10% larger than those of ENDF/BVI.