Two independent measurements of cross sections for the 19F+93Nb dissipative heavy-ion collision (DHIC) have been performed at incident energies from 100 to 108 MeV in steps of 250 keV. Two independently prepared targe...Two independent measurements of cross sections for the 19F+93Nb dissipative heavy-ion collision (DHIC) have been performed at incident energies from 100 to 108 MeV in steps of 250 keV. Two independently prepared targets were used respectively with all other experimental conditions being identical in both experiments. The data indicate non-reproducibility of the non-self-averaging oscillation yields in the two measurements. The statistical analysis of this non-reproducibility supports recent theoretical predictions of spontaneous coherence, slow phase randomization and extreme sensitivity in highly excited quantum many-body systems.展开更多
Two independent measurements of excitation functions of the strongly dissipative collision for the same reaction system of 19F+93Nb have been carried out at the China Institute of Atomic Energy, Beijing. In these meas...Two independent measurements of excitation functions of the strongly dissipative collision for the same reaction system of 19F+93Nb have been carried out at the China Institute of Atomic Energy, Beijing. In these measurements, the 19F8+ beam was provided by the HI-13 tandem accelerator. The incident beam energies were varied from 102 to 108 MeV in steps of 250 keV. In both measurements the same accelerator展开更多
The measurement of excitation functions for the strongly dissipative collision with the reaction system of ^19F+^27Al has been carried out at the China Institute of Atoraic Energy, Beijing. The ^19F^8+ beam was extrac...The measurement of excitation functions for the strongly dissipative collision with the reaction system of ^19F+^27Al has been carried out at the China Institute of Atoraic Energy, Beijing. The ^19F^8+ beam was extracted from the HI-13 tandem accelerator. The beam incident energies were varied from 110 to 118.75 MeV in steps of 250 keV. The self-supporting ^27A1 target foil with the thickness of 60μg/cm^2 was used. The detector arrangement is shown in Fig.1.展开更多
Deoxyribonucleic acid (DNA) is an important bio-macromolecule. DNA double strand breaks (DSBs) are considered to be the most important initial damage responsi- ble for all biological effects induced by ionizing radiat...Deoxyribonucleic acid (DNA) is an important bio-macromolecule. DNA double strand breaks (DSBs) are considered to be the most important initial damage responsi- ble for all biological effects induced by ionizing radiation. In this paper the length distribution of DNA fragments induced by 7Li ionizing radiation is fitted with the random breakage model. In this model, the parameter u is the average number of DSBs on every DNA molecule induced by ionizing radia- tion. The fitting result shows that the random breakage model cannot describe the distribution of DNA fragments in lower doses, while the random breakage model is in better accordance with the experimental data in higher doses. It is shown that the length distribution of DNA fragments has random statistical feature in higher doses. In this situation, the random breakage model looks like a model without any parameter since the u has specific physical meaning and can directly be obtained from experimental data.展开更多
基金Supported by the Natural Science Foundation of China(No.19775057 and No.10175083)the Major State Basic Research De-velopment(G2000077401)
文摘Two independent measurements of cross sections for the 19F+93Nb dissipative heavy-ion collision (DHIC) have been performed at incident energies from 100 to 108 MeV in steps of 250 keV. Two independently prepared targets were used respectively with all other experimental conditions being identical in both experiments. The data indicate non-reproducibility of the non-self-averaging oscillation yields in the two measurements. The statistical analysis of this non-reproducibility supports recent theoretical predictions of spontaneous coherence, slow phase randomization and extreme sensitivity in highly excited quantum many-body systems.
文摘Two independent measurements of excitation functions of the strongly dissipative collision for the same reaction system of 19F+93Nb have been carried out at the China Institute of Atomic Energy, Beijing. In these measurements, the 19F8+ beam was provided by the HI-13 tandem accelerator. The incident beam energies were varied from 102 to 108 MeV in steps of 250 keV. In both measurements the same accelerator
文摘The measurement of excitation functions for the strongly dissipative collision with the reaction system of ^19F+^27Al has been carried out at the China Institute of Atoraic Energy, Beijing. The ^19F^8+ beam was extracted from the HI-13 tandem accelerator. The beam incident energies were varied from 110 to 118.75 MeV in steps of 250 keV. The self-supporting ^27A1 target foil with the thickness of 60μg/cm^2 was used. The detector arrangement is shown in Fig.1.
基金supported by the National Natural Science Foundation of China(Grant Nos.10175095 and 10435020)the President Foundation of China Institute of Atomic Energy.
文摘Deoxyribonucleic acid (DNA) is an important bio-macromolecule. DNA double strand breaks (DSBs) are considered to be the most important initial damage responsi- ble for all biological effects induced by ionizing radiation. In this paper the length distribution of DNA fragments induced by 7Li ionizing radiation is fitted with the random breakage model. In this model, the parameter u is the average number of DSBs on every DNA molecule induced by ionizing radia- tion. The fitting result shows that the random breakage model cannot describe the distribution of DNA fragments in lower doses, while the random breakage model is in better accordance with the experimental data in higher doses. It is shown that the length distribution of DNA fragments has random statistical feature in higher doses. In this situation, the random breakage model looks like a model without any parameter since the u has specific physical meaning and can directly be obtained from experimental data.
