2003 Vol. 20, No. 4
Display Method:
2003, 20(4): 231-234.
doi: 10.11804/NuclPhysRev.20.04.231
Abstract:
Great progress was made on the study of P isotope both in theory and in experiments, but the final conclusion about the dripline of P isotope has not been made. In this article the properties of P isotope was studied in the frame work of relativistic mean field (RMF). First the probability of 25P as the dripline nuclei of P isotope and the proton halo structure of 25P was discussed, and then the RIBLL experiental result of 25P is presented.
Great progress was made on the study of P isotope both in theory and in experiments, but the final conclusion about the dripline of P isotope has not been made. In this article the properties of P isotope was studied in the frame work of relativistic mean field (RMF). First the probability of 25P as the dripline nuclei of P isotope and the proton halo structure of 25P was discussed, and then the RIBLL experiental result of 25P is presented.
2003, 20(4): 235-238.
doi: 10.11804/NuclPhysRev.20.04.235
Abstract:
The half-life of 7Be implanted in natural beryllium and in natural gold has been measured with high precision using two high-purity germanium detectors. T_(1/2)=53.275(25) d in natural beryllium and T_(1/2)=53.270(19) d in natural gold is obtained. Within our experimental precision, the difference in the effect of host media beryllium and gold on the half-life of 7Be isn t observed and an upper limit 0.12% of this effect can be set.
The half-life of 7Be implanted in natural beryllium and in natural gold has been measured with high precision using two high-purity germanium detectors. T_(1/2)=53.275(25) d in natural beryllium and T_(1/2)=53.270(19) d in natural gold is obtained. Within our experimental precision, the difference in the effect of host media beryllium and gold on the half-life of 7Be isn t observed and an upper limit 0.12% of this effect can be set.
2003, 20(4): 239-246.
doi: 10.11804/NuclPhysRev.20.04.239
Abstract:
The analysis on spallation product of proton-induced reaction with intermediate energy has important applications, such as astrophysics, biophysics, spallation neutron source, and accelerator-driven system (ADS) etc. In recent year, some theoretical models have been developed to investigate this reaction processes. At present work, we introduce the extrapolated classic theory, the quantum molecule dynamic (QMD) plus statistical decay and fission models, the method of Mento-Carlo and Smiempirical method for...
The analysis on spallation product of proton-induced reaction with intermediate energy has important applications, such as astrophysics, biophysics, spallation neutron source, and accelerator-driven system (ADS) etc. In recent year, some theoretical models have been developed to investigate this reaction processes. At present work, we introduce the extrapolated classic theory, the quantum molecule dynamic (QMD) plus statistical decay and fission models, the method of Mento-Carlo and Smiempirical method for...
2003, 20(4): 247-251.
doi: 10.11804/NuclPhysRev.20.04.247
Abstract:
Magnetic field calculation and design of CSRm modified W-type dipoles and of CSRe C-type dipoles are presented in this paper. Under the condition of lower cost, all of the designed parameters are better than required values. Now the prototype has been fabricated and also the magnetic field measurement has been done. According to the measured results, all the calculation and design are very reliable.
Magnetic field calculation and design of CSRm modified W-type dipoles and of CSRe C-type dipoles are presented in this paper. Under the condition of lower cost, all of the designed parameters are better than required values. Now the prototype has been fabricated and also the magnetic field measurement has been done. According to the measured results, all the calculation and design are very reliable.
2003, 20(4): 252-254.
doi: 10.11804/NuclPhysRev.20.04.252
Abstract:
The C-type dipole prototypes in the injection beam line from a Separate Sector Cyclotron (SSC) to Cooling Storage Ring (CSR) are selected as R & D for CSR magnets fabrication, because they have large bending angle and small radius, and are very difficult to stack and fabricate. A method to obtain good field homogeneity has been attempted in the C-type dipole prototype. This method is not the enlarged dipole pole but two imbedded conductors and two small power supplies. This is easy operating....
The C-type dipole prototypes in the injection beam line from a Separate Sector Cyclotron (SSC) to Cooling Storage Ring (CSR) are selected as R & D for CSR magnets fabrication, because they have large bending angle and small radius, and are very difficult to stack and fabricate. A method to obtain good field homogeneity has been attempted in the C-type dipole prototype. This method is not the enlarged dipole pole but two imbedded conductors and two small power supplies. This is easy operating....
2003, 20(4): 255-258.
doi: 10.11804/NuclPhysRev.20.04.255
Abstract:
A new branch beam line downstream of the stripper located between SFC and SSC is designed to collect the beams with the charge states other than the most intensive one. The layout of the branch beam line and the physical parameters for each dipole and quadrupole are given based on careful calculations.
A new branch beam line downstream of the stripper located between SFC and SSC is designed to collect the beams with the charge states other than the most intensive one. The layout of the branch beam line and the physical parameters for each dipole and quadrupole are given based on careful calculations.
2003, 20(4): 259-263.
doi: 10.11804/NuclPhysRev.20.04.259
Abstract:
The technique to measure the electron beam energy accurately with Compton backscattering technique is introduced and requirements for the experimental stations of radiometry are also described in the paper.
The technique to measure the electron beam energy accurately with Compton backscattering technique is introduced and requirements for the experimental stations of radiometry are also described in the paper.
2003, 20(4): 264-267.
doi: 10.11804/NuclPhysRev.20.04.264
Abstract:
The Structure and characteristics of the magnetron injection gun (MIG) for mm wave gyro-klytron are introduced. According to the requirements for the gyro-klytron, the relativistic effect and the space charge effect is taken into account . A program is developed for CAD. An electron gun code is used to simulate the electron trajectory, the influence of electrode shape, magnet field, electron trajectory on the electron beam have been studied. The theory for design of the electron gun is presented.
The Structure and characteristics of the magnetron injection gun (MIG) for mm wave gyro-klytron are introduced. According to the requirements for the gyro-klytron, the relativistic effect and the space charge effect is taken into account . A program is developed for CAD. An electron gun code is used to simulate the electron trajectory, the influence of electrode shape, magnet field, electron trajectory on the electron beam have been studied. The theory for design of the electron gun is presented.
2003, 20(4): 268-276.
doi: 10.11804/NuclPhysRev.20.04.268
Abstract:
In this paper, we give a description of recent progress on the measurements of electron-impact K-shell ionization cross-sections of atoms in the keV energy range. We present our experimental method of using thin targets with thick substrates and our measurements taken recently to improve the accuracy of the experimental data by an example of measuring K-shell ionization cross-section for Cr element within the incident energy of less than 26 keV. We also compare the K-shell experimental data sets availab...
In this paper, we give a description of recent progress on the measurements of electron-impact K-shell ionization cross-sections of atoms in the keV energy range. We present our experimental method of using thin targets with thick substrates and our measurements taken recently to improve the accuracy of the experimental data by an example of measuring K-shell ionization cross-section for Cr element within the incident energy of less than 26 keV. We also compare the K-shell experimental data sets availab...
2003, 20(4): 277-280.
doi: 10.11804/NuclPhysRev.20.04.277
Abstract:
The sine-squared potential and the equivalent magnetic field intensity have been introduced, the motion equation of the particle in bent crystal has been derived, the motion equation and the oscillation period of the particle have been solved exactly by Jacobian elliptic fuanction and the first kind of complet elliptic integrals, the intensity and the spectral properties of channelling radiation in bent crystal discussed.
The sine-squared potential and the equivalent magnetic field intensity have been introduced, the motion equation of the particle in bent crystal has been derived, the motion equation and the oscillation period of the particle have been solved exactly by Jacobian elliptic fuanction and the first kind of complet elliptic integrals, the intensity and the spectral properties of channelling radiation in bent crystal discussed.
2003, 20(4): 281-283.
doi: 10.11804/NuclPhysRev.20.04.281
Abstract:
Growth delay of the transplantable Lewis tumors growing in right hind legs of C(57) BL/6J mice and life prolongation of the mice with Lewis tumors were investigated after()~(12)C~(6+) ion radiation at HIRFL. The results show that growth volumes of the mouse tumors following carbon radiation are distinctly less than control during 21 days; the more fractions of radiation with same doses, the slower growth of tumors and the higher inhibition of tumors; different doses with the same fractions of radiation...
Growth delay of the transplantable Lewis tumors growing in right hind legs of C(57) BL/6J mice and life prolongation of the mice with Lewis tumors were investigated after()~(12)C~(6+) ion radiation at HIRFL. The results show that growth volumes of the mouse tumors following carbon radiation are distinctly less than control during 21 days; the more fractions of radiation with same doses, the slower growth of tumors and the higher inhibition of tumors; different doses with the same fractions of radiation...
2003, 20(4): 284-289.
doi: 10.11804/NuclPhysRev.20.04.284
Abstract:
As an expmple, the nuclear micro-probe facility in the Forschungszentrum Rossendorf is introduced, which has a minimum beam size of 2 micrometers and can be used to perform particle induced X-ray emission (PIXE), nuclear reaction analysis (NRA), elastic recoil detection analysis (ERDA), Rutherford back scattering (RBS) and channeling etc. micro-beam analyses. By using single point, linear and lateral scanning, the elements composition and distribution in samples can be studied in micrometer scale...
As an expmple, the nuclear micro-probe facility in the Forschungszentrum Rossendorf is introduced, which has a minimum beam size of 2 micrometers and can be used to perform particle induced X-ray emission (PIXE), nuclear reaction analysis (NRA), elastic recoil detection analysis (ERDA), Rutherford back scattering (RBS) and channeling etc. micro-beam analyses. By using single point, linear and lateral scanning, the elements composition and distribution in samples can be studied in micrometer scale...
2003, 20(4): 290-294.
doi: 10.11804/NuclPhysRev.20.04.290
Abstract:
There are interference of isotopes and isobars in accelerator mass spectrometry (AMS) measurements. Eliminating the isobaric interference is the important aspect in AMS measurements. Several methods of isobaric identification in AMS measurements are discussed in this paper. Principles, developments and applications of these methods are also introduced.
There are interference of isotopes and isobars in accelerator mass spectrometry (AMS) measurements. Eliminating the isobaric interference is the important aspect in AMS measurements. Several methods of isobaric identification in AMS measurements are discussed in this paper. Principles, developments and applications of these methods are also introduced.
2003, 20(4): 295-299.
doi: 10.11804/NuclPhysRev.20.04.295
Abstract:
The evaluation, measurement, and check of prompt γ-ray data for neutron capture are presented. The development of the database of prompt γ-ray activation analysis for neutron capture, and its structure and basical data are also described in the text.
The evaluation, measurement, and check of prompt γ-ray data for neutron capture are presented. The development of the database of prompt γ-ray activation analysis for neutron capture, and its structure and basical data are also described in the text.
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