Triple-differential cross section of the Pb-208(Li-6, alpha d)Pb-208 Coulomb breakup and astrophysical S-factor of the d(alpha,gamma)Li-6 reaction at extremely low energies

摘要

A method of calculation of the triple-differential cross section of the Pb-208(Li-6,alpha d)Pb-208 Coulomb breakup at astrophysically relevant energies E of the relative motion of the breakup fragments, taking into account the three-body (alpha-d-Pb-208) Coulomb effects and the contributions from the E1- and E2-multipoles, including their interference, has been proposed. The new results for the astrophysical S-factor of the direct radiative capture d(alpha, gamma)Li-6 reaction at E less than or equal to 250 keV have been obtained. It is shown that the experimental triple-differential cross section of the Pb-208(Li-6,alpha d)Pb-208 Coulomb breakup can also be used to give information about the value of the modulus squared of the nuclear vertex constant for the virtual decay 6Li --> alpha + d. (C) 2000 Published by Elsevier Science B.V. All rights reserved. [References: 32]