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Information × Registration Number 0217U000405, 0112U005028 , R & D reports Title Nuclear processes involving atomic shell popup.stage_title Head Fedotkin Sergey, Registration Date 02-02-2017 Organization Scientific Center "Institute for Nuclear Research" of National Academy of Sciences of Ukraine popup.description2 The process of atomic shell ionization at positron - atomic electron annihilation at beta+- decay was studied. The calculation is made for the case of positron annihilation with K-electron and subsequent ejection of K, L, M or N- atomic shell of other s- electron. The effect of shielding the nuclear charge atomic electrons on the probability of the process was studied. It is shown that consideration of screening is important only to calculate the probability for involving electron the upper shell with n = 4 and changes very little probability for shells with n = 2, 3. For the first time defined the experimental effective cross section of excitation nucleus 9Be by positrons from decay 66Ga via activation technique which gives sigma ef (beta +) = (7.1 ± 1.0) *10^-31 cm2. It is shown that the experimental value of the effective cross section of excitation of nucleus 9Be by positrons from decay 66Ga is the largest by the order with comparison the weighted average experimental cross sections for reaction 9Be (gamma, n) 8Be at energy values 1.78 - 5 MeV. Product Description popup.authors Вишневський Іван Миколайович Желтоножський Віктор Олександрович Коломиєць Володимир Михайлович Кривенко-Еметов Ярослав Дмитрович Саврасов Андрій Миколайович popup.nrat_date 2020-04-02 Close