Astrophysical S-factor of T(4He, γ)7Li reaction at Ecm = 15.7 keV; Physics of Particles and Nuclei Letters; Vol. 14, iss. 4
| Parent link: | Physics of Particles and Nuclei Letters: Scientific Journal Vol. 14, iss. 4.— 2017.— [P. 560–570] |
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| Collectivité auteur: | |
| Autres auteurs: | , , , , , , , , , |
| Résumé: | 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 |
| Langue: | anglais |
| Publié: |
2017
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| Sujets: | |
| Accès en ligne: | http://dx.doi.org/10.1134/S1547477117040057 |
| Format: | Électronique Chapitre de livre |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=655142 |