Within the target range from 0 to 0.1217 times the solar radius, the probability of 7Be existing as an ion with one or two bound electrons is calculated, which is turned out to be about 4.69 %, and about 95.31 % 7Be n...Within the target range from 0 to 0.1217 times the solar radius, the probability of 7Be existing as an ion with one or two bound electrons is calculated, which is turned out to be about 4.69 %, and about 95.31 % 7Be nucleus is completely ionized. After considering the influence of that portion of incompletely ionized 7Be, the renewly calculative result shows that the solar neutrino flux of 7Be will decrease from 45 000 m-2s-1 to 43 000 m-2s-1, and the predicted value of the 8B solar neutrino flux will increase from 515 m-2s-1 to 535 m-2s-1.展开更多
A massive earthquake measuring 9.0 on the Richter scale that occurred on March 11, 2011, on Honshu Island, Japan, caused radioactivity leakage from the Fukushima Nuclear Power Plant, which led to the leakage of artifi...A massive earthquake measuring 9.0 on the Richter scale that occurred on March 11, 2011, on Honshu Island, Japan, caused radioactivity leakage from the Fukushima Nuclear Power Plant, which led to the leakage of artificial nuclides(131I, 137 Cs, and 134Cs) and their global transportation by atmospheric circulation. This paper reports a systematic comparative observation on radioactive concentrations of natural nuclides(7Be and 210Pb) and artificial nuclides(131I, 137 Cs, and 134Cs) at the surface level, measured in weekly continuous aerosol sampling at Mount Guanfeng, Guiyang, China, from March 17, 2011 to April 28, 2011. During this period, the variations in the nuclide concentrations associated with their transport paths were analyzed with 315 hour back-trajectories of air mass initialized 500 m above the surface level at Guiyang. The results show that the pollutants of nuclear leakage from the Fukushima accident were transported to the Guiyang region of China via two significant pathways. In the first pathway the first wave of nuclear pollutants were transported from west to east in air masses at higher altitudes via global atmospheric circulation. The nuclear pollutants encircled the Earth almost once and after about 10 days to two weeks, between March 24 and March 31, 2011, intruded Guiyang from the northwestern region of China. In the second pathway, the nuclear pollutants from the Fukushima region arrived at Guiyang between April 7 and April 14, 2011, via air masses at lower altitudes that moved southwards because of the squeezing of the northeast Asian weather system and then by the influence, in succession, of the northeastern and southeastern air currents in the low-latitude region. The first transport pathway for atmospheric pollutants is on a global scale and based on air masses at higher altitudes, and the second transport pathway is on an eastern Asia regional scale and based on the air masses at lower altitude.展开更多
基金the National Natural Science Foundation of China (No. 10275073) and also by the Key Laboratory of Cosmic Ray and Astrophysics+1 种基金 Institute of High Energy Physics the Chinese Academy of Sciences.
文摘Within the target range from 0 to 0.1217 times the solar radius, the probability of 7Be existing as an ion with one or two bound electrons is calculated, which is turned out to be about 4.69 %, and about 95.31 % 7Be nucleus is completely ionized. After considering the influence of that portion of incompletely ionized 7Be, the renewly calculative result shows that the solar neutrino flux of 7Be will decrease from 45 000 m-2s-1 to 43 000 m-2s-1, and the predicted value of the 8B solar neutrino flux will increase from 515 m-2s-1 to 535 m-2s-1.
基金financially supported jointly by National Natural Science Foundation of China(Grant No.41175115)the EML of the United States of America
文摘A massive earthquake measuring 9.0 on the Richter scale that occurred on March 11, 2011, on Honshu Island, Japan, caused radioactivity leakage from the Fukushima Nuclear Power Plant, which led to the leakage of artificial nuclides(131I, 137 Cs, and 134Cs) and their global transportation by atmospheric circulation. This paper reports a systematic comparative observation on radioactive concentrations of natural nuclides(7Be and 210Pb) and artificial nuclides(131I, 137 Cs, and 134Cs) at the surface level, measured in weekly continuous aerosol sampling at Mount Guanfeng, Guiyang, China, from March 17, 2011 to April 28, 2011. During this period, the variations in the nuclide concentrations associated with their transport paths were analyzed with 315 hour back-trajectories of air mass initialized 500 m above the surface level at Guiyang. The results show that the pollutants of nuclear leakage from the Fukushima accident were transported to the Guiyang region of China via two significant pathways. In the first pathway the first wave of nuclear pollutants were transported from west to east in air masses at higher altitudes via global atmospheric circulation. The nuclear pollutants encircled the Earth almost once and after about 10 days to two weeks, between March 24 and March 31, 2011, intruded Guiyang from the northwestern region of China. In the second pathway, the nuclear pollutants from the Fukushima region arrived at Guiyang between April 7 and April 14, 2011, via air masses at lower altitudes that moved southwards because of the squeezing of the northeast Asian weather system and then by the influence, in succession, of the northeastern and southeastern air currents in the low-latitude region. The first transport pathway for atmospheric pollutants is on a global scale and based on air masses at higher altitudes, and the second transport pathway is on an eastern Asia regional scale and based on the air masses at lower altitude.
