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Direct Measurement of the Astrophysical F19(p,αγ)O16 Reaction in the Deepest Operational Underground laboratory

Physical Review Letters 2021年第15期127卷 152702-152702页

作者： L. Y. Zhang J. Su J. J. He M. Wiescher R. J. deBoer D. Kahl Y. J. Chen X. Y. Li J. G. Wang L. Zhang F. Q. Cao H. Zhang Z. C. Zhang T. Y. Jiao Y. D. Sheng L. H. Wang L. Y. Song X. Z. Jiang Z. M. Li E. T. Li S. Wang G. Lian Z. H. Li X. D. Tang H. W. Zhao L. T. Sun Q. Wu J. Q. Li B. Q. Cui L. H. Chen R. G. Ma B. Guo S. W. Xu J. Y. Li N. C. Qi W. L. Sun X. Y. Guo P. Zhang Y. H. Chen Y. Zhou J. F. Zhou J. R. He C. S. Shang M. C. Li X. H. Zhou Y. H. Zhang F. S. Zhang Z. G. Hu H. S. Xu J. P. Chen W. P. Liu Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and Technology Beijing Normal University Beijing 100875 China Department of Physics and The Joint Institute for Nuclear Astrophysics University of Notre Dame Notre Dame Indiana 46556 USA Extreme Light Infrastructure—Nuclear Physics Horia Hulubei National Institute for Research and Development in Physics and Nuclear Engineering (IFIN-HH) Bucharest-Măgurele 077125 Romania Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China China Institute of Atomic Energy Beijing 102413 China College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space Sciences Shandong University Weihai 264209 China Yalong River Hydropower Development Company Chengdu 610051 China

Fluorine is one of the most interesting elements in nuclear astrophysics, where the F19(p,α)O16 reaction is of crucial importance for Galactic F19 abundances and CNO cycle loss in first generation Population III stars. As a day-one campaign at the Jinping Underground Nuclear Astrophysics experimental facility, we report direct measurements of the essential F19(p,αγ)O16 reaction channel. The γ-ray yields were measured over Ec.m.=72.4–344 keV, covering the Gamow window; our energy of 72.4 keV is unprecedentedly low, reported here for the first time. The experiment was performed under the extremely low cosmic-ray-induced background environment of the China JinPing Underground laboratory, one of the deepest underground laboratories in the world. The present low-energy S factors deviate significantly from previous theoretical predictions, and the uncertainties are significantly reduced. The thermonuclear F19(p,αγ)O16 reaction rate has been determined directly at the relevant astrophysical energies.

关键词： H & He burning H & He induced nuclear reactions Nuclear astrophysics Resonance reactions

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New α-emitting isotope 214U and abnormal enhancement of α-particle clustering in lightest uranium isotopes

arXiv

引用

arXiv 2021年

作者： Zhang, Zhiyuan Y. Yang, H.B. Huang, M.H. Gan, Z.G. Yuan, C.X. Qi, C. Andreyev, A.N. Liu, M.L. Ma, L. Zhang, M.M. Tian, Y.L. Wang, Y.S. Wang, J.G. Yang, C.L. Li, G.S. Qiang, Y.H. Yang, W.Q. Chen, R.F. Zhang, H.B. Lu, Z.W. Xu, X.X. Duan, L.M. Yang, H.R. Huang, W.X. Liu, Z. Zhou, X.H. Zhang, Y.H. Xu, H.S. Wang, N. Zhou, H.B. Wen, X.J. Huang, S. Hua, W. Zhu, L. Wang, X. Mao, Y.C. He, X.T. Wang, S.Y. Xu, W.Z. Li, H.W. Ren, Z.Z. Zhou, S.G. CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China School of Nuclear Science TechnologyUniversity of Chinese Academy of Sciences Beijing100049 China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen University Zhuhai519082 China StockholmSE-10691 Sweden Department of Physics University of York YorkYO10 5DD United Kingdom Advanced Science Research Center Japan Atomic Energy Agency TokaiIbaraki319-1195 Japan School of Nuclear Science TechnologyLanzhou University Lanzhou730000 China Guangxi Key Laboratory of Nuclear Physics and Technology Guangxi Normal University Guilin541004 China State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing100871 China Department of Physics Liaoning Normal University Dalian116029 China College of Material Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing210016 China Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment School of Space Science and Physics Institute of Space Sciences Shandong University Weihai264209 China School of Physics Science and Engineering Tongji University Shanghai200092 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing100190 China Center of Theoretical Nuclear Physics National Laboratory of Heavy-Ion Accelerator Lanzhou730000 China

A new α-emitting isotope 214U, produced by fusion-evaporation reaction 182W(36Ar, 4n)214U, was identified by employing the gas-filled recoil separator SHANS and recoil-α correlation technique. More precise α-decay properties of even-even nuclei 216,218U were also measured in reactions of 40Ar, 40Ca with 180,182,184W targets. By combining the experimental data, improved α-decay reduced widths δ2 for the even-even Po–Pu nuclei in the vicinity of magic neutron number N = 126 were deduced. Their systematic trends are discussed in terms of NpNn scheme in order to study the influence of proton-neutron interaction on α decay in this region of nuclei. It is strikingly found that the reduced widths of 214,216U are significantly enhanced by a factor of two as compared with the NpNn systematics for the 84 ≤ Z ≤ 90 and N 7/2 and ν1f5/2 spin-orbit partner orbits, which is supported by a large-scale shell model calculation. © 2021, CC BY.

关键词： Isotopes

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Deep Underground laboratory Measurement of C13(α,n)O16 in the Gamow Windows of the s and i Processes

引用

Physical Review Letters 2022年第13期129卷 132701-132701页

作者： B. Gao T. Y. Jiao Y. T. Li H. Chen W. P. Lin Z. An L. H. Ru Z. C. Zhang X. D. Tang X. Y. Wang N. T. Zhang X. Fang D. H. Xie Y. H. Fan L. Ma X. Zhang F. Bai P. Wang Y. X. Fan G. Liu H. X. Huang Q. Wu Y. B. Zhu J. L. Chai J. Q. Li L. T. Sun S. Wang J. W. Cai Y. Z. Li J. Su H. Zhang Z. H. Li Y. J. Li E. T. Li C. Chen Y. P. Shen G. Lian B. Guo X. Y. Li L. Y. Zhang J. J. He Y. D. Sheng Y. J. Chen L. H. Wang L. Zhang F. Q. Cao W. Nan W. K. Nan G. X. Li N. Song B. Q. Cui L. H. Chen R. G. Ma S. Q. Yan J. H. Liao Y. B. Wang S. Zeng D. Nan Q. W. Fan N. C. Qi W. L. Sun X. Y. Guo P. Zhang Y. H. Chen Y. Zhou J. F. Zhou J. R. He C. S. Shang M. C. Li S. Kubono W. P. Liu R. J. deBoer M. Wiescher M. Pignatari Joint Department for Nuclear Physics Institute of Modern Physics Chinese Academy of Sciences and Lanzhou University Lanzhou 730000 China CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern Physics Chinese Academy of Sciences Lanzhou 73000 People’s Republic of China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing 100049 People’s Republic of China Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and Technology Sichuan University Chengdu 610064 China College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen University Zhuhai Guangdong 519082 People’s Republic of China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China China Institute of Atomic Energy Beijing 102413 People’s Republic of China Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space Sciences Shandong University Weihai 264209 China Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and Technology Beijing Normal University Beijing 100875 China Yalong River Hydropower Development Company Chengdu 610051 China RIKEN Nishina Center Wako Saitama 351-0198 Japan Department of Physics and the Joint Institute for Nuclear Astrophysics University of Notre Dame Notre Dame Indiana 46556 USA Center for Nuclear Study University of Tokyo Wako Saitama 351-0198 Japan Wolfson Fellow of Royal Society School of Physics and Astronomy University of Edinburgh King’s Buildings Edinburgh EH9 3FD United Kingdom Konkoly Observatory Research Centre for Astronomy and Earth Sciences (CSFK) Eötvös Loránd Research Network (ELKH) Konkoly Thege Miklós út 15-17 H-1121 Budapest Hunga

The C13(α,n)O16 reaction is the main neutron source for the slow-neutron-capture process in asymptotic giant branch stars and for the intermediate process. Direct measurements at astrophysical energies in above-ground laboratories are hindered by the extremely small cross sections and vast cosmic-ray-induced background. We performed the first consistent direct measurement in the range of Ec.m.=0.24 to 1.9 MeV using the accelerators at the China Jinping Underground laboratory and Sichuan University. Our measurement covers almost the entire intermediate process Gamow window in which the large uncertainty of the previous experiments has been reduced from 60% down to 15%, eliminates the large systematic uncertainty in the extrapolation arising from the inconsistency of existing datasets, and provides a more reliable reaction rate for the studies of the slow-neutron-capture and intermediate processes along with the first direct determination of the alpha strength for the near-threshold state.

关键词： H & He burning Hydrostatic stellar nucleosynthesis Nuclear astrophysics s process

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Deep underground laboratory measurement of 13C(α,n)16O in the Gamow windows of the s- and i-processes

arXiv

引用

arXiv 2022年

作者： Gao, B. Jiao, T.Y. Li, Y.T. Chen, H. Lin, W.P. An, Z. Ru, L.H. Zhang, Z.C. Tang, X.D. Wang, X.Y. Zhang, N.T. Fang, X. Xie, D.H. Fan, Y.H. Ma, L. Zhang, X. Bai, F. Wang, P. Fan, Y.X. Liu, G. Huang, H.X. Wu, Q. Zhu, Y.B. Chai, J.L. Li, J.Q. Sun, L.T. Wang, S. Cai, J.W. Li, Y.Z. Zhang, H. Li, Z.H. Li, Y.J. Li, E.T. Chen, C. Shen, Y.P. Lian, G. Guo, B. Li, X.Y. Zhang, L.Y. He, J.J. Sheng, Y.D. Chen, Y.J. Wang, L.H. Zhang, L. Cao, F.Q. Nan, W. Nan, W.K. Li, G.X. Song, N. Cui, B.Q. Chen, L.H. Ma, R.G. Zhang, Z.C. Yan, S.Q. Liao, J.H. Wang, Y.B. Zeng, S. Nan, D. Fan, Q.W. Qi, N.C. Sun, W.L. Guo, X.Y. Zhang, P. Chen, Y.H. Zhou, Y. Zhou, J.F. He, J.R. Shang, C.S. Li, M.C. Kubono, S. Liu, W.P. deBoer, R.J. Wiescher, M. Pignatari, M. Joint department for nuclear physics Lanzhou University Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern Physics Chinese Academy of Sciences Lanzhou73000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Radiation Physics and Technology The Ministry of Education Institute of Nuclear Science and Technology Sichuan University Chengdu610064 China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen University Guangdong Zhuhai519082 China School of Nuclear Science and Technology Lanzhou University Lanzhou730000 China China Institute of Atomic Energy Beijing102413 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space Sciences Shandong University Weihai264209 China Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and Technology Beijing Normal University Beijing100875 China College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Yalong River Hydropower Development Company Chengdu610051 China RIKEN Nishina Center Saitama Wako351-0198 Japan Center for Nuclear Study University of Tokyo Saitama Wako351-0198 Japan Department of Physics the Joint Institute for Nuclear Astrophysics University of Notre Dame Notre DameIN46556 United States Wolfson Fellow of Royal Society School of Physics and Astronomy University of Edinburgh King’s Buildings EdinburghEH9 3FD United Kingdom Konkoly Thege Miklós út 15-17 BudapestH-1121 Hungary CSFK MTA Centre of Excellence Konkoly Thege Miklós út 15-17 BudapestH-1121 Hungary E. A. Milne Centre for Astrophysics Department of Physics and Mathematics University of Hull HU6 7RX United

The 13C(α,n)16O reaction is the main neutron source for the slow-neutron-capture (s-) process in Asymptotic Giant Branch stars and for the intermediate (i-) process. Direct measurements at astrophysical energies in above-ground laboratories are hindered by the extremely small cross sections and vast cosmic-ray induced background. We performed the first consistent direct measurement in the range of Ec.m. =0.24 MeV to 1.9 MeV using the accelerators at the China Jinping Underground laboratory (CJPL) and Sichuan University. Our measurement covers almost the entire i-process Gamow window in which the large uncertainty of the previous experiments has been reduced from 60% down to 15%, eliminates the large systematic uncertainty in the extrapolation arising from the inconsistency of existing data sets, and provides a more reliable reaction rate for the studies of the s- and i-processes along with the first direct determination of the alpha strength for the near-threshold state. © 2022, CC BY.

关键词： Neutron sources

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Mantle geochemistry: Insights from ocean island basalts

引用

science China Earth sciences 2017年第11期60卷 1976-2000页

作者： HUANG ShiChun ZHENG YongFei Department of Geoscience University of Nevada CAS Key Laboratory of Crust-Mantle Material and Environment School of Earth and Space Sciences University of Science and Technology of China

The geochemical study of the Earth's mantle provides important constraints on our understanding of the formation and evolution of Earth, its internal structure, and the mantle dynamics. The bulk Earth composition is inferred by comparing terrestrial mantle rocks with chondrites, which leads to the chondritic Earth model. That is, Earth has the same relative proportions of refractory elements as that in chondrites, but it is depleted in volatiles. Ocean island basalts(OIB) may be produced by mantle plumes with possible deep origins; consequently, they provide unique opportunity to study the deep Earth. Isotopic variations within OIB can be described using a limited number of mantle endmembers, such as EM1, EM2 and HIMU, and they have been used to decipher important mantle processes. Introduction of crustal material into the deep mantle via subduction and delamination is important in generating mantle heterogeneity; however, there is active debate on how they were sampled by mantle melting, i.e.,the role of olivine-poor lithologies in the OIB petrogenesis. The origin and location of high 3He/4He mantle remain controversial,ranging from unprocessed(or less processed) primitive material in the lower mantle to highly processed materials with shallow origins, including ancient melting residues, mafic cumulates under arcs, and recycled hydrous minerals. Possible core-mantle interaction was hypothesized to introduce distinctive geochemical signatures such as radiogenic 186 Os and Fe and Ni enrichment in the OIB. Small but important variations in some short-lived nuclides, including 142 Nd, 182 W and several Xe isotopes, have been reported in ancient and modern terrestrial rocks, implying that the Earth's mantle must have been differentiated within the first 100 Myr of its formation, and the mantle is not efficiently homogenized by mantle convection.

关键词： Mantle structure Mantle composition Crustal components Crust-mantle interaction Crustal recycling

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Fine structure in the α decay of U219

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Physical Review C 2019年第6期100卷 064317-064317页

作者： M. M. Zhang Y. L. Tian Y. S. Wang X. H. Zhou Z. Y. Zhang H. B. Yang M. H. Huang L. Ma C. L. Yang Z. G. Gan J. G. Wang H. B. Zhou S. Huang X. T. He S. Y. Wang W. Z. Xu H. W. Li X. X. Xu L. M. Duan Z. Z. Ren S. G. Zhou H. S. Xu CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing 100049 China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China Guangxi Key Laboratory of Nuclear Physics and Technology Guangxi Normal University Guilin 541004 China College of Material Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment School of Space Science and Physics Shandong University Weihai 264209 China Department of Nuclear Physics China Institute of Atomic Energy Beijing 102413 China School of Physics Science and Engineering Tongji University Shanghai 200092 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China Center of Theoretical Nuclear Physics National Laboratory of Heavy-Ion Accelerator Lanzhou 730000 China

The heaviest N = 127 even-odd isotone U219 was produced in a fusion evaporation reaction employing Ar40 ions bombarding W183 target. Fusion evaporation residues were separated in flight by the gas-filled recoil separator Spectrometer for Heavy Atoms and Nuclear Structure and subsequently identified using a recoil-α correlation method. The α-decay properties of U219 were measured with improved precision, and two new α-decay lines were observed and assigned as the decays from the ground state of U219 to the (5/2−) and (3/2−) states of Th215, respectively. The systematics for the α decay of the N = 127 even-odd isotones as well as the low-lying nuclear structure of their N = 125 daughter nuclei are discussed.

关键词： Alpha decay Low & intermediate energy heavy-ion reactions Rare & new isotopes 190 ≤ A ≤ 219

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Color centers induced by proton exposure in aluminum oxide hollow particles

引用

AIP Conference Proceedings 2018年第1期2051卷

作者： V. I. Iurina V. V. Neshchimenko M. M. Mikhailov Chundong Li 1Space Materials Laboratory Amur State University Blagoveshchensk 675027 Russia 2Radiation and Space Materials Laboratory Tomsk State University of Control Systems and Radio-Electronics Tomsk 634050 Russia 3Key Laboratory of Science and Technology on Material Performance Evaluating in Space Environment Harbin Institute of Technology Harbin 150001 PR China

The effects of proton (E = 100 keV, F = 54×1015 cm–2) exposure on the reflective spectra of Al2O3 hollow particles in wavelength range from 250 to 2500 nm have been investigated. Hollow particles were obtained by deposition nanoparticles on polystyrene balls in chitosan solution with subsequent heat treatment. X-ray photoelectron spectra of the material were analyzed for the O1s peak before and after irradiation. It has been established that radiation stability of the hollow particles is higher than that of Al2O3 microparticles. This effect is caused by the low concentration of color centers in the hollow particle due to lack of material in the bulk of particles.

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Proton and electron irradiation effects on outgassing behaviors of polymers in vacuum and its mechanism

Proton and electron irradiation effects on outgassing behavi...

引用

12th International Symposium on materials in the space environment, ISMSE 2012

作者： Hai, Liu Bin, Shu Gang, Liu Yong, Liu Science and Technology on Material Performance Evaluating in Space Environment Laboratory Harbin Institute of Technology Harbin 150001 China

The effects of 160keV electron and 100keV proton on outgassing feature of DGEBA/DICY and dimethyl silicone rubber were investigated using a simulating facility of space radiation environment. Under radiation of electrons and protons, the mass loss of DGEBA/DICY exhibits an exponential increase with increasing irradiation fluence. The dimethyl silicone rubber shows higher irradiation stability than DGEBA/DICY. The mass loss of dimethyl silicone rubber has little change under electron irradiation, and increase under proton irradiation. The maximum mass loss of rubber is lower than that of DGEBA/DICY under the same irradiation condition. The in-situ analyses of mass spectrum and fourier infrared spectrum show that, the charged particles cause the breaking of C-C, C-H, C-N, and C-O, of which have lower binding energy in DGEBA/DICY, leading to degradation reaction and formation of small-molecular substance. The volatilization of the formed small-molecular substance enhances the outgassing process. The net structure produced by reaction of pendant group plays an obstacle role for outgassing. Cross-link reaction was found in the proton irradiated rubber. The partial degradation of molecular chain resulted from the irradiation induced bond breaking of Si-O facilitates the outgassing process. Copyright © 2013 European space Agency.

关键词： Electron irradiation

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The total organic content analysis and its long-term forecast method for manned spacecraft crew cabin materials

The total organic content analysis and its long-term forecas...

引用

64th International Astronautical Congress 2013, IAC 2013

作者： Xing, Guo Yi, Wang Yang, Shengsheng Zhuang, Jianhong Wang, Shuguang Yang, Qing Lanzhou Institute of Physics Space Technology Science and Technology on Vacuum and Cryogenics Technology and Physics Laboratory PO Box 94 Lanzhou Gansu Province 730000 China Lanzhou Institute of Physics Space Technology Science and Technology on Material Performance Evaluating in Space Environment Laboratory Gansu Lanzhou 730000 China

ISBN: (纸本)9781629939094

The organic materials used in in the crew module in a confined space degradation of volatile gas, most of these gases are volatile organic compounds(VOC), is an important source of air pollution. Therefore, the test total organic content is one important criteria of the evaluation of the toxicity of cabin material. Presently evaluation method of the toxicity are mostly concerned about the short-term manned space flight material outgassing toxicity. This paper provide a method for evaluating a long-term manned flight materials outgassing toxicity. Using the outgassing gas evaluation device of crew module to test a rubber which used in cabin. The test method according to the standard Q/W 1155-2008 Detecting method of hazard gas from non-metal materials in spacecraft crew module, collecting the outgassing products from materials in given condition, And quantitative analysis of the total organic content by gas chromatography. The method of quantitative analysis is n-pentane external standard quantitative. The results show that the test device developed background pollution to meet the design requirements, the infection for the test results can be ignored. The content of VOC for the rubber is 1.93g/g o Base on the effect of mechanism of temperature-time for the material outgassing, we give the method for estimate the total organic content in long-term manned flight.

关键词： Toxicity

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Evaluation and prediction of InGaP2/GaAs/Ge solar cell performance in space radiation environment

Evaluation and prediction of InGaP2/GaAs/Ge solar cell perfo...

引用

64th International Astronautical Congress 2013, IAC 2013

作者： Xin, Gao Yang, Sheng-Sheng Feng, Zhan-Zu Lei, Zhang Cui, Xinyu He, Yuanji Feng, Dongming Science and Technology on Vacuum and Cryogenics Technology Physics Laboratory Lanzhou Institute of Physics Lanzhou 730000 China Science and Technology on Material Performance Evaluating in Space Environment Laboratory China Lanzhou Institute of Physics Lanzhou 730000 China Tianj in Institute of Power Sources Tianjin 300381 China

ISBN: (纸本)9781629939094

The space radiation environment is mainly composed of electrons, protons or their combinations. Exposure to these charged particles typically degrades the electrical performance of semiconductor devices, especially less-shielded space solar array, thus limiting the lifetime of the solar array. Therefore, to be used in space, understanding the radiation response of solar cell is extremely important for accurate predictions of the expected mission lifetime. The effects of GEO (Altitude 35,870km, Inclination 0°), MEO (Altitude 21,500km, Inclination 55°) and LEO (Altitude 799km, Inclination 99°) radiation environments are investigated on the degradation of a new type InGaP 2/GaAs/Ge triple-junction solar cell (Manufactured in China). The on-ground irradiation experiments were performed to evaluate radiation effects of electrons and protons on the solar cells, and also to provide experimental data for predictions of the cell performances under the space radiation environments. For these cell types I-V characteristics were obtained as a function of radiation fluence using electrons (1.0, 1.5 and 2.0 MeV) and protons (3, 5, 8 and 10 MeV). Illuminated current-voltage (I-V) characteristics of each sample were measured both before and after irradiation using a Spectrolab X-25 solar simulator under AM0 condition (air mass zero, 1 sun, 25 °C conditions). The prediction results of the performance degradations of the GaAs cells are presented as a function of cell material, and cover glass, and the system orbit and lifetime in the space radiation environments, using the displacement damage dose methodology for analyzing and modeling. This study provides reference data for the design of the GaAs solar arrays in the typical space radiation environments to ensure the security and reliability of on-orbit spacecrafts. Copyright © 2013 by the International Astronautical Federation.

关键词： Gallium arsenide

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