State-selective single-and double-electron capture processes in collisions of S^(5+)ions with helium at energies ranging from 50.8 keV to 100 keV were investigated using cold target recoil ion momentum spectroscopy(CO...State-selective single-and double-electron capture processes in collisions of S^(5+)ions with helium at energies ranging from 50.8 keV to 100 keV were investigated using cold target recoil ion momentum spectroscopy(COLTRIMS).Q-value spectra and projectile scattering angle distributions were obtained.For single-electron capture,single electron capture into n=3 states of the projectile ion is dominant.As the projectile energy increases,the contribution of single electron capture into n=4 states is observed.Experimental relative cross-sections for single-electron capture into different projectile final states were compared with theoretical predictions based on the molecular orbital close-coupling(MOCC)method.In double-electron capture,two-electron populating into the 3s^(2)3p and 3s3p^(2)states of projectile dominates.The reaction window calculated from the classical molecular Coulombic barrier model can qualitatively explain the experimental results.The scattering angle distribution of the multi-peak structure of the double-electron capture process is observed.The database is openly available in Science Data Bank at https://doi.org/10.57760/sciencedb.j00113.00233.展开更多
Cross sections of electron-loss in H（1s）＋ H（1s） collisions and total collisional destruction of H（2s） in H（1s） 4- H（2s） collisions are calculatted by four-body classical-trajectory Monte Caylo （CTMC） meth...Cross sections of electron-loss in H（1s）＋ H（1s） collisions and total collisional destruction of H（2s） in H（1s） 4- H（2s） collisions are calculatted by four-body classical-trajectory Monte Caylo （CTMC） method and compared with previous theoretical and experimental data over the energy range of 4-100 keV. For the former a good agreement is obtained within different four-body CTMC calculations, and for the incident energy Ep 〉 10 keV, comparison with the experimental data shows a better agreement than the results calculated by the impact parameter approx- imation. For the latter, our theory predicts the correct experimental behaviour, and the discrepancies between our results and experimental ones are less than 30%. Based on the successive comparison with experiments, the cross sections for excitation to H（2p）, single- and double-ionization and H- formation in H（2s）＋H（2s） collisions are calculated in the energy range of 4-100 keV for the first time, and compared with those in H（1s）＋H（1s） and H（1s）＋U（2s） collisions.展开更多
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
基金Project supported by the National Key Research and Development Program of China(Grant No.2022YFA1602500)the National Natural Science Foundation of China(Grant No.11974358)。
文摘State-selective single-and double-electron capture processes in collisions of S^(5+)ions with helium at energies ranging from 50.8 keV to 100 keV were investigated using cold target recoil ion momentum spectroscopy(COLTRIMS).Q-value spectra and projectile scattering angle distributions were obtained.For single-electron capture,single electron capture into n=3 states of the projectile ion is dominant.As the projectile energy increases,the contribution of single electron capture into n=4 states is observed.Experimental relative cross-sections for single-electron capture into different projectile final states were compared with theoretical predictions based on the molecular orbital close-coupling(MOCC)method.In double-electron capture,two-electron populating into the 3s^(2)3p and 3s3p^(2)states of projectile dominates.The reaction window calculated from the classical molecular Coulombic barrier model can qualitatively explain the experimental results.The scattering angle distribution of the multi-peak structure of the double-electron capture process is observed.The database is openly available in Science Data Bank at https://doi.org/10.57760/sciencedb.j00113.00233.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10434100, 10574018 and 10574020.
文摘Cross sections of electron-loss in H（1s）＋ H（1s） collisions and total collisional destruction of H（2s） in H（1s） 4- H（2s） collisions are calculatted by four-body classical-trajectory Monte Caylo （CTMC） method and compared with previous theoretical and experimental data over the energy range of 4-100 keV. For the former a good agreement is obtained within different four-body CTMC calculations, and for the incident energy Ep 〉 10 keV, comparison with the experimental data shows a better agreement than the results calculated by the impact parameter approx- imation. For the latter, our theory predicts the correct experimental behaviour, and the discrepancies between our results and experimental ones are less than 30%. Based on the successive comparison with experiments, the cross sections for excitation to H（2p）, single- and double-ionization and H- formation in H（2s）＋H（2s） collisions are calculated in the energy range of 4-100 keV for the first time, and compared with those in H（1s）＋H（1s） and H（1s）＋U（2s） collisions.
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.
