d - alpha Radiative capture process by effective field theory

摘要

Two of the main components of nuclear fusion processes which occur in stars are the radiative capture of deuteron-alpha and its inverse reaction during which helium transforms into larger elements. One of the reactions occuring is the production of Li-6 through the d(alpha,gamma)Li-6 reaction that is supported by the Big Bang model. The process of radiation in the energy region 0.07 MeV <= E-cm <= 0.41 MeV has been studied in the framework of Effective Field Theory (EFT) at low energy. Further, within the EFT framework deuteron is assumed as a dibaryon and the coulomb effect between deuteron and alpha is ignored. The reaction amplitude for the P-wave initial states P-3(2), P-3(0) and P-2(3/2) and the astrophysical S-factor for sum of E-1 and E-2 transitions are found in the framework of EFT up to NLO. The results of this model for the astrophysical S-factor at low energies are comparable with the available experimental data and those of other theoretical models.