Astrophysical S-factor of T(4He, γ)7Li reaction at Ecm = 15.7 keV; Physics of Particles and Nuclei Letters; Vol. 14, iss. 4

Astrophysical S-factor of T(4He, γ)7Li reaction at Ecm = 15.7 keV; Physics of Particles and Nuclei Letters; Vol. 14, iss. 4

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Parent link:	Physics of Particles and Nuclei Letters: Scientific Journal Vol. 14, iss. 4.— 2017.— [P. 560–570]
Tác giả của công ty:	Национальный исследовательский Томский политехнический университет (ТПУ) Физико-технический институт (ФТИ) Лаборатория № 33 ядерного реактора
Tác giả khác:	Bystritsky V. M. Vyacheslav Mikhaylovich, Dudkin G. N. Gennadiy Nikolaevich, Emets E. G. Evgeny Gennadievich, Filipovich M. Marius, Krylov A. R. Aleksandr Romanovich, Nechaev B. A. Boris Aleksandrovich, Nurkin А. Azamat, Padalko V. N. Vladimir Nikolaevich, Filippov A. V. Aleksandr Viktorovich, Sadovsky A. B. Andrey Borisovich
Tóm tắt:	Title screen The astrophysical S-factor of the reaction T(4He, γ)7Li is measured for the first time at the center of mass energy Ecm = 15.7 keV, lower than the energy range of the Standard Big Bang Nucleosynthesis (SBBN) model. The experiment is performed on a Hall pulsed accelerator (TPU, Tomsk). An acceleration pulse length of 10 μs allows one to suppress the background of cosmic radiation and the ambient medium by five orders of magnitude. A beam intensity of ~ 5 × 10144He+ ions per pulse allows one to measure an extremely low reaction yield. The yield of γ-quanta with the energies Eγ0= 2483.7 keV and Eγ1= 2006.1 keV is registered by NaI(Tl) detectors with the efficiency ε = 0.331 ± 0.026. A method for direct measurement of the background from the chain of reactions T(4He, 4He)T→T(T, 2n)X→(n, γ) and/or (n, n′γ) which ends by neutron activation of materials surrounding the target is proposed and implemented in this study. The value of the astrophysical S-factor of the reaction T(4He, γ)7Li Sαt(Ecm = 15.7 keV) = 0.091 ± 0.032 keV b provides the choice from the set of experimental data for the astrophysical Sαt-factor in favor of experimental data [4] with Sαt(Ecm = 0) = 0.1067 ± 0.0064 keV b. Режим доступа: по договору с организацией-держателем ресурса
Ngôn ngữ:	Tiếng Anh
Được phát hành:	2017
Những chủ đề:	электронный ресурс труды учёных ТПУ
Truy cập trực tuyến:	http://dx.doi.org/10.1134/S1547477117040057
Định dạng:	Điện tử Chương của sách
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=655142

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