2005 Vol. 22, No. 3
Display Method:
2005, 22(3): 233-237.
doi: 10.11804/NuclPhysRev.22.03.233
Abstract:
The method of elastic resonance scattering in inverse kinematics, which was progressed in recent years, is briefly introduced. It is a novel experimental technique to perform meaningful experiments under conditions of the very short-lived nuclides and the beam intensities only 1 000 atoms/s. The excitation function of recoil proton has been measured in experiment; the shape of proton energy spectrum can be also used to uniquely deter- mine the energy of resonant states, spin-parity, partial decay width and spectroscopic factors of the states. This method is mainly used in the investigation of unstable nuclei and the level parameters measurement of near threshold resonant state of the nuclear astrophysics related nuclei.
The method of elastic resonance scattering in inverse kinematics, which was progressed in recent years, is briefly introduced. It is a novel experimental technique to perform meaningful experiments under conditions of the very short-lived nuclides and the beam intensities only 1 000 atoms/s. The excitation function of recoil proton has been measured in experiment; the shape of proton energy spectrum can be also used to uniquely deter- mine the energy of resonant states, spin-parity, partial decay width and spectroscopic factors of the states. This method is mainly used in the investigation of unstable nuclei and the level parameters measurement of near threshold resonant state of the nuclear astrophysics related nuclei.
2005, 22(3): 238-242.
doi: 10.11804/NuclPhysRev.22.03.238
Abstract:
The systematic features of signature splitting of the h11/2 9/2 [ 514] rotational band in Lutetium and Tantalum isotope chains have been investigated and compared with that of πh11/2×vi13/2 2-quasiparticle band in oddodd nuclei of the same nuclear region. It is shown that signature inversion of 3-quasiparticle band of some odd- Z Lutetium and Tantalum nuclei most probably caused by the p-n interaction of h11/2 quasiproton and i13/2 quasineutron.
The systematic features of signature splitting of the h11/2 9/2 [ 514] rotational band in Lutetium and Tantalum isotope chains have been investigated and compared with that of πh11/2×vi13/2 2-quasiparticle band in oddodd nuclei of the same nuclear region. It is shown that signature inversion of 3-quasiparticle band of some odd- Z Lutetium and Tantalum nuclei most probably caused by the p-n interaction of h11/2 quasiproton and i13/2 quasineutron.
2005, 22(3): 243-247.
doi: 10.11804/NuclPhysRev.22.03.243
Abstract:
According to both the development on badrons physics and the aspect of Lanzhou cooling storage ring （CSR） and based on the analysis and propositions given by experts in China, we propose some hadrons physics program at CSR. The hadron spectroscopy produced in light nucleus collisions at CSR used to probe the quark and gluon structure of hadrons, to study the modification of the hadron properties in nuclear matter and to investigate the spontaneous breaking of the chiral symmetry and its partial restoration. Especially, the proton-proton collisions at beam energies per proton below 2.8 GeV at CSR should be used to measure the strangeness asymmetry and strange form lector, to probe the existence of hyperon and pentaquarks and to find the evidence for the existence of dibaryon.
According to both the development on badrons physics and the aspect of Lanzhou cooling storage ring （CSR） and based on the analysis and propositions given by experts in China, we propose some hadrons physics program at CSR. The hadron spectroscopy produced in light nucleus collisions at CSR used to probe the quark and gluon structure of hadrons, to study the modification of the hadron properties in nuclear matter and to investigate the spontaneous breaking of the chiral symmetry and its partial restoration. Especially, the proton-proton collisions at beam energies per proton below 2.8 GeV at CSR should be used to measure the strangeness asymmetry and strange form lector, to probe the existence of hyperon and pentaquarks and to find the evidence for the existence of dibaryon.
2005, 22(3): 248-250.
doi: 10.11804/NuclPhysRev.22.03.248
Abstract:
The beryllium abundance acts as a key role for understanding the inhomogeneous Big Bang nucleosynthesis. In order to measure the ^9Be（p, α）^6Li bare nucleus cross section and S（E） factor at astrophysical energies, the Trojan Horse Method （THM） can be applied. The main feature of the method is that it allows to extract the energy dependence for the astrophysical S（E） factor of bare nuclei at very low energies without any extrapolation, by measuring the cross section of an appropriate three body process. Thus the ^9Be （p,α）^6Li has been studied by means of the THM applied to the ^2H（^9Be,α^6Li）n at INFN-LNS, Catania, Italy. The two body reaction cross section has been studied in the energy range of Ecm=0-1 000 keV. Preliminary results are discussed and a comparison with direct data is made.
The beryllium abundance acts as a key role for understanding the inhomogeneous Big Bang nucleosynthesis. In order to measure the ^9Be（p, α）^6Li bare nucleus cross section and S（E） factor at astrophysical energies, the Trojan Horse Method （THM） can be applied. The main feature of the method is that it allows to extract the energy dependence for the astrophysical S（E） factor of bare nuclei at very low energies without any extrapolation, by measuring the cross section of an appropriate three body process. Thus the ^9Be （p,α）^6Li has been studied by means of the THM applied to the ^2H（^9Be,α^6Li）n at INFN-LNS, Catania, Italy. The two body reaction cross section has been studied in the energy range of Ecm=0-1 000 keV. Preliminary results are discussed and a comparison with direct data is made.
2005, 22(3): 251-253.
doi: 10.11804/NuclPhysRev.22.03.251
Abstract:
Searching for TeV burst-like events coincident with the BATSE GRBs data was made by using the ASγ （Tibet-Ⅲ） data. In the period we analysed, there were 25 BATSE GRBs in the field view of Tibet. A search region was defined by the BATSE 90% confidence level positioning error. A GRB candidate was chosen as a shower cluster appearing in a given small sky window and a given time interval. An equi-zenith-angle method was used to estimate the background. No significant TeV GRBs were detected. The flux upper limit at the 95% confidence level was estimated to be about 7.1×10^-9 γ（cm^2·s） by Monte Carlo simulation.
Searching for TeV burst-like events coincident with the BATSE GRBs data was made by using the ASγ （Tibet-Ⅲ） data. In the period we analysed, there were 25 BATSE GRBs in the field view of Tibet. A search region was defined by the BATSE 90% confidence level positioning error. A GRB candidate was chosen as a shower cluster appearing in a given small sky window and a given time interval. An equi-zenith-angle method was used to estimate the background. No significant TeV GRBs were detected. The flux upper limit at the 95% confidence level was estimated to be about 7.1×10^-9 γ（cm^2·s） by Monte Carlo simulation.
2005, 22(3): 254-260.
doi: 10.11804/NuclPhysRev.22.03.254
Abstract:
The radiofrequency quadrupole （RFQ） cooler and buncher has been developed in many laboratories to improve the secondary radioactive ion beam quality. In this paper, the principles of the RFQ constraint, buffer gas cooling, axial electric field and Paul trap are discussed in detail. The studies around the world and our work are also briefly introduced.
The radiofrequency quadrupole （RFQ） cooler and buncher has been developed in many laboratories to improve the secondary radioactive ion beam quality. In this paper, the principles of the RFQ constraint, buffer gas cooling, axial electric field and Paul trap are discussed in detail. The studies around the world and our work are also briefly introduced.
2005, 22(3): 261-266.
doi: 10.11804/NuclPhysRev.22.03.261
Abstract:
Isotope Separator on Line is briefly introduced with emphasis on the basic concept and features related to the production of exotic nuclei and β decay spectroscopy. The Ion Guide Isotope Separator on Line （IGISOL）at the University of Jyv（ae）skyl（ae）, Finland is presented in detail with experimental results on the decay of neutron-rich silver isotopes produced in proton induced symmetric fission.
Isotope Separator on Line is briefly introduced with emphasis on the basic concept and features related to the production of exotic nuclei and β decay spectroscopy. The Ion Guide Isotope Separator on Line （IGISOL）at the University of Jyv（ae）skyl（ae）, Finland is presented in detail with experimental results on the decay of neutron-rich silver isotopes produced in proton induced symmetric fission.
2005, 22(3): 267-271.
doi: 10.11804/NuclPhysRev.22.03.267
Abstract:
In the present work, Coincidence Doppler Broadening （CDB） measurements have been performed for five elements i.e. Ti, Ni, Cu, Al and Si. As to the CDB spectra of Ni, we obtained the annihilation fraction of positron-electron pairs in the source by least square fitting. After source correction, spectra for Si are also given to indicate the influence of source components. CDB spectra were simulated with Gauss-Parabola model to separate annihilation contribution of core electrons from outermost electrons. Furthermore, a new source correction method, i.e. source correction will be done only in the contribution of core electron, has been presented
In the present work, Coincidence Doppler Broadening （CDB） measurements have been performed for five elements i.e. Ti, Ni, Cu, Al and Si. As to the CDB spectra of Ni, we obtained the annihilation fraction of positron-electron pairs in the source by least square fitting. After source correction, spectra for Si are also given to indicate the influence of source components. CDB spectra were simulated with Gauss-Parabola model to separate annihilation contribution of core electrons from outermost electrons. Furthermore, a new source correction method, i.e. source correction will be done only in the contribution of core electron, has been presented
2005, 22(3): 272-275.
doi: 10.11804/NuclPhysRev.22.03.272
Abstract:
Ф60 mm silicon PIN detector is a large area and high sensitive one which has been developed in near years. Using the type CГC-67 γ accelerator, the parameters of PIN detectors such as time response, linear current and relative sensitivity are measured. The experiment results are compared with the theory calculation. The PIN detector can reach high γefficiency of up to 10^-14-10^-16 C·cm2, the rise time is about 10 ns and the FWHM of the time pulse is about 35 ns. The γ efficiency of the PIN detector may provide the sensitive range between 10^-14-10^-16 C·cm^2 that scintillator ＋ photo tubes detecting system and scintillator ＋ photomul tiplier tubes detecting system is not developed.
Ф60 mm silicon PIN detector is a large area and high sensitive one which has been developed in near years. Using the type CГC-67 γ accelerator, the parameters of PIN detectors such as time response, linear current and relative sensitivity are measured. The experiment results are compared with the theory calculation. The PIN detector can reach high γefficiency of up to 10^-14-10^-16 C·cm2, the rise time is about 10 ns and the FWHM of the time pulse is about 35 ns. The γ efficiency of the PIN detector may provide the sensitive range between 10^-14-10^-16 C·cm^2 that scintillator ＋ photo tubes detecting system and scintillator ＋ photomul tiplier tubes detecting system is not developed.
2005, 22(3): 276-279.
doi: 10.11804/NuclPhysRev.22.03.276
Abstract:
The structure of electrostatic accelerator and some technical problems arising in development, including the RF ion source doesn＇ t produce discharge, the controlling system is out of order and the accelerating tube cracks et al. , are introduced; the reasons and the solving means of these problems are analyzed; a stable proton beam with 100 μA and 3 MeV is obtained.
The structure of electrostatic accelerator and some technical problems arising in development, including the RF ion source doesn＇ t produce discharge, the controlling system is out of order and the accelerating tube cracks et al. , are introduced; the reasons and the solving means of these problems are analyzed; a stable proton beam with 100 μA and 3 MeV is obtained.
2005, 22(3): 280-283.
doi: 10.11804/NuclPhysRev.22.03.280
Abstract:
We employed the prematurely chromosome condensation （PCC） technique to investigate the 48 h kinetic repair of normal human liver cell line L02 exposed to γ-rays. The results showed that chromatidtype and isochromatid-type breaks increased with the dose at 0 h measured by PCC, the number of chromatid-type breaks was several times more than that of isochromatid-type breaks. Further 24 h incubationafter exposed to irradiation, both of these two type breaks decreased in different extent, 50% for chromatid-type one, change of the the main type easy to repair. 15% for isochromatid-type one at most, respectively. chromosome breaks compared with that of 24th h（p〉 0. 05 of the chromosome breaks was chromatid-type after exposed 48th h, there was a slightly ）. These results revealed that to low LET rays, also, it was Though the isochromatid-type breaks was obvioously less than that of the chromatid-type one, it was difficult to repair. It implied that the isochromatid-type breaks was the important factor causing cell death and canceration when cells were exposed to irradiations.
We employed the prematurely chromosome condensation （PCC） technique to investigate the 48 h kinetic repair of normal human liver cell line L02 exposed to γ-rays. The results showed that chromatidtype and isochromatid-type breaks increased with the dose at 0 h measured by PCC, the number of chromatid-type breaks was several times more than that of isochromatid-type breaks. Further 24 h incubationafter exposed to irradiation, both of these two type breaks decreased in different extent, 50% for chromatid-type one, change of the the main type easy to repair. 15% for isochromatid-type one at most, respectively. chromosome breaks compared with that of 24th h（p〉 0. 05 of the chromosome breaks was chromatid-type after exposed 48th h, there was a slightly ）. These results revealed that to low LET rays, also, it was Though the isochromatid-type breaks was obvioously less than that of the chromatid-type one, it was difficult to repair. It implied that the isochromatid-type breaks was the important factor causing cell death and canceration when cells were exposed to irradiations.
2005, 22(3): 284-287.
doi: 10.11804/NuclPhysRev.22.03.284
Abstract:
Radiotherapy has some disadvantages due to the severe side-effect on the normal tissues at a curative dose of ionizing radiation （IR）. Similarly, as a new developing approach, gene therapy also has some disadvantages, such as lack of specificity for tumors, limited expression of therapeutic gene, potential biological risk. To certain extent, above problems would be solved by the suicide genes or p53 gene and its target genes the rapies targeted by ionizing radiation. This strategy not only makes up the disadvantages from radiotherapy or gene therapy alone, but also promotes success rate on the base of lower dose. By present, there have been several vectors measuring up to be reaching clinical trials. This review focused on the development of the cancer gene therapy through suicide genes or p53 and its target genes mediated by IR.
Radiotherapy has some disadvantages due to the severe side-effect on the normal tissues at a curative dose of ionizing radiation （IR）. Similarly, as a new developing approach, gene therapy also has some disadvantages, such as lack of specificity for tumors, limited expression of therapeutic gene, potential biological risk. To certain extent, above problems would be solved by the suicide genes or p53 gene and its target genes the rapies targeted by ionizing radiation. This strategy not only makes up the disadvantages from radiotherapy or gene therapy alone, but also promotes success rate on the base of lower dose. By present, there have been several vectors measuring up to be reaching clinical trials. This review focused on the development of the cancer gene therapy through suicide genes or p53 and its target genes mediated by IR.
2005, 22(3): 288-291.
doi: 10.11804/NuclPhysRev.22.03.288
Abstract:
Radiation immunology as a new subject has made a great progress in recent years, especially in the radiation hormesis. At the same time, the research of radiobiological effect on heavy ions has played an important role in the cancer therapy, especially on the radiation immunology of heavy ions in the outer space. In this review, we summaried the status and development of radiation-immunology, and try to find out some better ways which can increase efficient killing on tumours, but reduce the damages on normal tissues.
Radiation immunology as a new subject has made a great progress in recent years, especially in the radiation hormesis. At the same time, the research of radiobiological effect on heavy ions has played an important role in the cancer therapy, especially on the radiation immunology of heavy ions in the outer space. In this review, we summaried the status and development of radiation-immunology, and try to find out some better ways which can increase efficient killing on tumours, but reduce the damages on normal tissues.
2005, 22(3): 292-295.
doi: 10.11804/NuclPhysRev.22.03.292
Abstract:
With the accomplishment of the human genome project, proteomics becomes a new snbject on the buildup of the whole proteins and their dynamic changes in cell emerges. Cancer is a kind of complex disease involved in multi-genes and proteins. Heavy ion therapy is all arising and potential radiation treatment nowadays. This paper reviews on the main methods and technology in proteomics-- two-dimensional gel electrophoresis （2-DE）,biological mass spectrometry, protein biochips, bioinformatics and its application on identification of cancer biomarkers, evaluation of curative effect on tumour and the mechanisms of turnout formation. This paper also presents some prospects on the application of proteomics in heavv ion therapy.
With the accomplishment of the human genome project, proteomics becomes a new snbject on the buildup of the whole proteins and their dynamic changes in cell emerges. Cancer is a kind of complex disease involved in multi-genes and proteins. Heavy ion therapy is all arising and potential radiation treatment nowadays. This paper reviews on the main methods and technology in proteomics-- two-dimensional gel electrophoresis （2-DE）,biological mass spectrometry, protein biochips, bioinformatics and its application on identification of cancer biomarkers, evaluation of curative effect on tumour and the mechanisms of turnout formation. This paper also presents some prospects on the application of proteomics in heavv ion therapy.
2005, 22(3): 296-299.
doi: 10.11804/NuclPhysRev.22.03.296
Abstract:
A testing wave function which includes a elastic coordinate coefficient is proposed for double electron atoms. A program which can solve three body prohlem with variational method is developed by using Matlab language. Ground state energies and analytic wave functions of N^5＋ and O^6＋ ious are obtained by using the program.
A testing wave function which includes a elastic coordinate coefficient is proposed for double electron atoms. A program which can solve three body prohlem with variational method is developed by using Matlab language. Ground state energies and analytic wave functions of N^5＋ and O^6＋ ious are obtained by using the program.
2005, 22(3): 300-303.
doi: 10.11804/NuclPhysRev.22.03.300
Abstract:
According to the density matrix theory, the density matrix of photon emitted from excited atom P state and of P state were introdued in this paper. There were a simple direct relation between the two density matrices, which shows that the electron cloud shape of excited atomic state and scattering dynamics can be described through the observable Stokes parameters of photon in electron-photon coincidence experiment.
According to the density matrix theory, the density matrix of photon emitted from excited atom P state and of P state were introdued in this paper. There were a simple direct relation between the two density matrices, which shows that the electron cloud shape of excited atomic state and scattering dynamics can be described through the observable Stokes parameters of photon in electron-photon coincidence experiment.
甘公网安备 62010202000723号