Astrophysical S-factor of T(4He, γ)7Li reaction at E cm = 15.7 keV

V. M. Bystritsky, G. N. Dudkin, E. G. Emets, M. Filipowicz, A. R. Krylov, B. A. Nechaev, A. Nurkin, V. N. Padalko, A. V. Philippov, A. B. Sadovsky

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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 × 1014 4He+ ions per pulse allows one to measure an extremely low reaction yield. The yield of γ-quanta with the energies Eγ 0= 2483.7 keV and Eγ 1= 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.

Original languageEnglish
Pages (from-to)560-570
Number of pages11
JournalPhysics of Particles and Nuclei Letters
Issue number4
Publication statusPublished - 1 Jul 2017

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging

Fingerprint Dive into the research topics of 'Astrophysical S-factor of T(<sup>4</sup>He, γ)<sup>7</sup>Li reaction at E <sub>cm</sub> = 15.7 keV'. Together they form a unique fingerprint.

Cite this