2006 Vol. 23, No. 3
Display Method:
2006, 23(3): 263-270.
doi: 10.11804/NuclPhysRev.23.03.263
Abstract:
A brief review is given on recent studies of hyperon rare decay both in theory and experiment. Some problems which exist in the field are presented. A possibility of study on the rare decay of Hyperon ∑^＋ at CSR is discussed.
A brief review is given on recent studies of hyperon rare decay both in theory and experiment. Some problems which exist in the field are presented. A possibility of study on the rare decay of Hyperon ∑^＋ at CSR is discussed.
2006, 23(3): 271-274.
doi: 10.11804/NuclPhysRev.23.03.271
Abstract:
The Skyrme Model and its descriptions for baryons are introduced briefly. We have proposed a color flux tube configuration, and calculated the energy line density of the color flux tube and derived a equation of the color flux tube configuration which can be used to study the features of the color flux tube. The existence of the color flux tube configuration in Skyrme Model shows that the quarks are confined.
The Skyrme Model and its descriptions for baryons are introduced briefly. We have proposed a color flux tube configuration, and calculated the energy line density of the color flux tube and derived a equation of the color flux tube configuration which can be used to study the features of the color flux tube. The existence of the color flux tube configuration in Skyrme Model shows that the quarks are confined.
2006, 23(3): 275-279.
doi: 10.11804/NuclPhysRev.23.03.275
Abstract:
The sensitivity of the neutron skin thickness S in ^208Pb to the new addition of the high order isospin-dependent nucleon-ω-ρ coupling term in the relativistic mean field model is studied. Calculations show that the high order isospin-dependent nucleon-ω-ρ coupling term can further soften the symmetry energy, and thus further decrease the neutron radius of ^208Pb without affecting other ground-state observables
The sensitivity of the neutron skin thickness S in ^208Pb to the new addition of the high order isospin-dependent nucleon-ω-ρ coupling term in the relativistic mean field model is studied. Calculations show that the high order isospin-dependent nucleon-ω-ρ coupling term can further soften the symmetry energy, and thus further decrease the neutron radius of ^208Pb without affecting other ground-state observables
2006, 23(3): 280-283.
doi: 10.11804/NuclPhysRev.23.03.280
Abstract:
Within the Boltzmann-Langevin equation, the isospin effects on the production cross sections of light charged particles （LCP） in the reaction of proton rich nuclei were studied. We have calculated the LCP productio n cross sections of the reaction ^12-15N ＋ ^28Si at 55 MeV/u and ^17-20Ne ＋ ^9Be at 60 MeV/u. The LCP production cross sections of ^12N increase abnormally in comparison with those of ^13-15N. The result accorded with experimental one. It also happened to ^17-20Ne. It suggests that ^17Ne is probably a proton halo nucleus.
Within the Boltzmann-Langevin equation, the isospin effects on the production cross sections of light charged particles （LCP） in the reaction of proton rich nuclei were studied. We have calculated the LCP productio n cross sections of the reaction ^12-15N ＋ ^28Si at 55 MeV/u and ^17-20Ne ＋ ^9Be at 60 MeV/u. The LCP production cross sections of ^12N increase abnormally in comparison with those of ^13-15N. The result accorded with experimental one. It also happened to ^17-20Ne. It suggests that ^17Ne is probably a proton halo nucleus.
2006, 23(3): 284-289.
doi: 10.11804/NuclPhysRev.23.03.284
Abstract:
At present, the high spin state of ^143 Pm（Z = 61, N = 82） have been investigated. The level scheme of ^143Pm has been extended up to an excitation energy Ex = 8 397.6 keV and spin J =47/2（ h = 1 ）. Based on the nuclear shell model （NSM）, we have calculated the sequences of γ-ray transition rates and the pure E2 reduced transition probabilities of ^143Pm, and compared with experimental data. The formula of single-particle transition probability in the OXBASH code was applied in this paper.
At present, the high spin state of ^143 Pm（Z = 61, N = 82） have been investigated. The level scheme of ^143Pm has been extended up to an excitation energy Ex = 8 397.6 keV and spin J =47/2（ h = 1 ）. Based on the nuclear shell model （NSM）, we have calculated the sequences of γ-ray transition rates and the pure E2 reduced transition probabilities of ^143Pm, and compared with experimental data. The formula of single-particle transition probability in the OXBASH code was applied in this paper.
2006, 23(3): 290-295.
doi: 10.11804/NuclPhysRev.23.03.290
Abstract:
The progress of 1 keV-200 MeV A 〉 24 nucleon local and non-local spherical optical potential is briefly introduced.
The progress of 1 keV-200 MeV A 〉 24 nucleon local and non-local spherical optical potential is briefly introduced.
2006, 23(3): 296-299.
doi: 10.11804/NuclPhysRev.23.03.296
Abstract:
It was discussed in this article that the effects of different monitors in the cross section measurements of nuclear reactions induced by 14 MeV neutrons, at the same time some monitors and correlative parameters were listed. The excitation functions of monitors are taken from the evaluatied cross sections, and a qualitative analysis has been performed for ^27Al（n,p） ^27Mg reaction. It indicates that the choice of monitor is very important for cross section measurements
It was discussed in this article that the effects of different monitors in the cross section measurements of nuclear reactions induced by 14 MeV neutrons, at the same time some monitors and correlative parameters were listed. The excitation functions of monitors are taken from the evaluatied cross sections, and a qualitative analysis has been performed for ^27Al（n,p） ^27Mg reaction. It indicates that the choice of monitor is very important for cross section measurements
2006, 23(3): 300-303.
doi: 10.11804/NuclPhysRev.23.03.300
Abstract:
26Al is an important long-lived radionuclide in many research fields. The different measurement method of 26Al by using Accelerator Mass pectrometry （AMS） are described, and the characters of these methods are also briefly discussed. The application of 26Al to geology, biomedicine, nuclear physics and nuclear astrophysics are also introduced in this paper
26Al is an important long-lived radionuclide in many research fields. The different measurement method of 26Al by using Accelerator Mass pectrometry （AMS） are described, and the characters of these methods are also briefly discussed. The application of 26Al to geology, biomedicine, nuclear physics and nuclear astrophysics are also introduced in this paper
2006, 23(3): 304-309.
doi: 10.11804/NuclPhysRev.23.03.304
Abstract:
The seven main chemical components of the body and glaze samples of 84 RuGuan porcelains from Qingliangsi kiln and JunGuan porcelains from Juntai kiln are determined by the proton induced X-ray emission （ PIXE）. Then these data are analyzed by scatter analysis to confirm whether the sources of the raw materials of Ru-Guan porcelain from Qingliangsi kiln and JunGuan porcelain from Juntai kiln are the same or not. The figure of the scatter diagram shows that the sourcing area of the raw material and batch formula of RuGuan porcelain and Jun-Guan porcelain glaze are obviously different and the sources of the raw materials and components of their body samples are close but a bit different.
The seven main chemical components of the body and glaze samples of 84 RuGuan porcelains from Qingliangsi kiln and JunGuan porcelains from Juntai kiln are determined by the proton induced X-ray emission （ PIXE）. Then these data are analyzed by scatter analysis to confirm whether the sources of the raw materials of Ru-Guan porcelain from Qingliangsi kiln and JunGuan porcelain from Juntai kiln are the same or not. The figure of the scatter diagram shows that the sourcing area of the raw material and batch formula of RuGuan porcelain and Jun-Guan porcelain glaze are obviously different and the sources of the raw materials and components of their body samples are close but a bit different.
2006, 23(3): 310-314.
doi: 10.11804/NuclPhysRev.23.03.310
Abstract:
The relationships between intensities of scattered neutrons by specimens and their shapes and detecting distances have been simulated using a hollow cylinder model, and the results were validated by experiments of fast neutron imaging using ^241Am-Be neutron source. The results showed that the intensities of scattered neutrons are closely related to the detecting distances and sample＇ s shapes. The influences of scattered neutronns in fast neutron imaging will be reduced while detecting distances increased.
The relationships between intensities of scattered neutrons by specimens and their shapes and detecting distances have been simulated using a hollow cylinder model, and the results were validated by experiments of fast neutron imaging using ^241Am-Be neutron source. The results showed that the intensities of scattered neutrons are closely related to the detecting distances and sample＇ s shapes. The influences of scattered neutronns in fast neutron imaging will be reduced while detecting distances increased.
2006, 23(3): 315-321.
doi: 10.11804/NuclPhysRev.23.03.315
Abstract:
Exploring the nonlinear dynamics of the negative feedback loop composed of p53 and Mdm2 proteins, we propose a signal-response model to study the dynamical mechanism of the different oscillatory behaviors for the activities of p53 and Mdm2 proteins both in individual and population of cells. It is shown that the sustained and damped oscillatory dynamics could be described in a unified way when the dynamics of damage-derived signal is properly introduced.
Exploring the nonlinear dynamics of the negative feedback loop composed of p53 and Mdm2 proteins, we propose a signal-response model to study the dynamical mechanism of the different oscillatory behaviors for the activities of p53 and Mdm2 proteins both in individual and population of cells. It is shown that the sustained and damped oscillatory dynamics could be described in a unified way when the dynamics of damage-derived signal is properly introduced.
2006, 23(3): 322-325.
doi: 10.11804/NuclPhysRev.23.03.322
Abstract:
The radiosensitivity of respiratory deficiency yeast mutants has been studied in this work. The mutants which were screened from the yeasts after ionizing irradiation were irradiated with ^12C^6＋ at different doses.Because of the great change in its mitochondria and mitochondrial DNA, the respiratory deficiency yeast mutants show radiosensitivity at dose less than 1 Gy and radioresistance at doses higher than 1 Gy.
The radiosensitivity of respiratory deficiency yeast mutants has been studied in this work. The mutants which were screened from the yeasts after ionizing irradiation were irradiated with ^12C^6＋ at different doses.Because of the great change in its mitochondria and mitochondrial DNA, the respiratory deficiency yeast mutants show radiosensitivity at dose less than 1 Gy and radioresistance at doses higher than 1 Gy.
2006, 23(3): 326-330.
doi: 10.11804/NuclPhysRev.23.03.326
Abstract:
Cancer treatment is one of the most important fields in medical research. All strategies such as radiotherapy, chemotherapy, surgery, and gene-based therapy have their own advantages and disadvantages. Nowadays, a novel method which combined p53-gene therapy with radiotherapy plays an important role in the field of cancer research. This review summarized the current state of combined therapies of p53-genetherapy and radiotherapy, possible mechanism and recent progress.
Cancer treatment is one of the most important fields in medical research. All strategies such as radiotherapy, chemotherapy, surgery, and gene-based therapy have their own advantages and disadvantages. Nowadays, a novel method which combined p53-gene therapy with radiotherapy plays an important role in the field of cancer research. This review summarized the current state of combined therapies of p53-genetherapy and radiotherapy, possible mechanism and recent progress.
2006, 23(3): 331-334.
doi: 10.11804/NuclPhysRev.23.03.331
Abstract:
The structure geometry and single point energy of small molecule are calculated by HF, MP2 and G2 methods and all base sets （except cc-pVQZ）available in Gaussian98 program software package. All these results are compared with the experimental data. It indicates that the molecule geometries optimized by G2 method in Gaussian98 are always in good accordance with experimental results, but the single point energy calculated by MP2 or G2 method differs some much from the experimental data. It is unsuitable to calculate the heat of formation through the single point energy of reactant calculated by methods and base sets provided by Gaussian98.
The structure geometry and single point energy of small molecule are calculated by HF, MP2 and G2 methods and all base sets （except cc-pVQZ）available in Gaussian98 program software package. All these results are compared with the experimental data. It indicates that the molecule geometries optimized by G2 method in Gaussian98 are always in good accordance with experimental results, but the single point energy calculated by MP2 or G2 method differs some much from the experimental data. It is unsuitable to calculate the heat of formation through the single point energy of reactant calculated by methods and base sets provided by Gaussian98.
2006, 23(3): 335-338.
doi: 10.11804/NuclPhysRev.23.03.335
Abstract:
The time-dependent density functional theory （TDDFT） and local density approximation （LDA） are used to calculate the dipole moment changes, the ionization probabilities of the H20 molecule and the time-dependent probabilities of escaped electrons in the process of excitation of H2O molecule by C^＋ , C^2＋ with energy of 2.3 MeV/u. It is shown that the dipole moment changes of H2O are the greatest and the higher the charge staate of heavy ion, the bigger the probabilities of the high charge state of H2O molecule at maximal heavy ion potential. The dipole moment changes slightly when heavy ion leaved far from molecule.
The time-dependent density functional theory （TDDFT） and local density approximation （LDA） are used to calculate the dipole moment changes, the ionization probabilities of the H20 molecule and the time-dependent probabilities of escaped electrons in the process of excitation of H2O molecule by C^＋ , C^2＋ with energy of 2.3 MeV/u. It is shown that the dipole moment changes of H2O are the greatest and the higher the charge staate of heavy ion, the bigger the probabilities of the high charge state of H2O molecule at maximal heavy ion potential. The dipole moment changes slightly when heavy ion leaved far from molecule.
2006, 23(3): 339-342.
doi: 10.11804/NuclPhysRev.23.03.339
Abstract:
The delayed supercritical process of nuclear reactor with temperature feedback and heat transfer while inserting small step reactivity（ρ0〈β）is analyzed. A new model is proposed. For an initial power, the variations of output power and reactivity with time are obtained by numerical method. The results are analyzed and discussed. Some useful new conclusions are drawn.
The delayed supercritical process of nuclear reactor with temperature feedback and heat transfer while inserting small step reactivity（ρ0〈β）is analyzed. A new model is proposed. For an initial power, the variations of output power and reactivity with time are obtained by numerical method. The results are analyzed and discussed. Some useful new conclusions are drawn.
2006, 23(3): 343-347.
doi: 10.11804/NuclPhysRev.23.03.343
Abstract:
Plutonium is the most important material for the nuclear weapon and nuclear reactor, but the metal is very complex in its physical behaves and chemical properties. The microscopic and macroscopic research of this metal is a challenge to the modern science and technology. In this paper, we focus on the research of plutonium aging mechanism, and the three mechanisms induced the aging of plutonium were presented. Methods and means, especially the results for the research are also presented to give some references to the related study.
Plutonium is the most important material for the nuclear weapon and nuclear reactor, but the metal is very complex in its physical behaves and chemical properties. The microscopic and macroscopic research of this metal is a challenge to the modern science and technology. In this paper, we focus on the research of plutonium aging mechanism, and the three mechanisms induced the aging of plutonium were presented. Methods and means, especially the results for the research are also presented to give some references to the related study.
2006, 23(3): 348-352.
doi: 10.11804/NuclPhysRev.23.03.348
Abstract:
Due to energetic cluster produces simultaneous impacts of several atoms and deposits extremely high energy density in a very small area, the cluster impingement on solids has produced non-linear radiation damages not presented in the collisions of individual atoms with those solids. The radiation damages are usually investigated by channeling Rutherford backscattering, Scanning Tunneling Microscope （STM）, Transmission Electronic c Microscope（TEM） and computer simulation. The typical methods and results on the non-linear radiation damages induced by clusters are reviewed in this paper.
Due to energetic cluster produces simultaneous impacts of several atoms and deposits extremely high energy density in a very small area, the cluster impingement on solids has produced non-linear radiation damages not presented in the collisions of individual atoms with those solids. The radiation damages are usually investigated by channeling Rutherford backscattering, Scanning Tunneling Microscope （STM）, Transmission Electronic c Microscope（TEM） and computer simulation. The typical methods and results on the non-linear radiation damages induced by clusters are reviewed in this paper.
2006, 23(3): 353-358.
doi: 10.11804/NuclPhysRev.23.03.353
Abstract:
Nuclear battery has lots of advantages such as small volume, longevity, environal stability and so on, therefore, it was widely used in aerospace, deep-sea , polar region, heart pacemaker, micro-electromotor and other fields etc. The application of nuclear battery and the development of its materials promote each other. In this paper the development and the latest research progress of nuclear battery materials has been introduced from the view of radioisotope, electric energy conversion and encapsulation. And the current and potential applications of the nuclear battery are also summarized.
Nuclear battery has lots of advantages such as small volume, longevity, environal stability and so on, therefore, it was widely used in aerospace, deep-sea , polar region, heart pacemaker, micro-electromotor and other fields etc. The application of nuclear battery and the development of its materials promote each other. In this paper the development and the latest research progress of nuclear battery materials has been introduced from the view of radioisotope, electric energy conversion and encapsulation. And the current and potential applications of the nuclear battery are also summarized.
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