Theoretical Study of the 4He(γ, p)3H and 4He(γ, n)3He Reactions

Abstract

Ab initio calculation of the total cross section for the reactions 4 He(γ, p) 3 H and 4 He(γ, n) 3 He is presented, using state-of-the-art nuclear forces. The Lorentz integral transform (LIT) method is applied, which allows exact treatment of the final state interaction (FSI). The dynamic equations are solved using the effective interaction hyperspherical harmonics (EIHH) method. In this calculation of the cross sections the three-nucleon force is fully taken into account, except in the source term of the LIT equation for the FSI transition matrix element.

Electromagnetic reactions on light nuclei

“…We compare them to the exclusive measurements from Tornow et al [250] and from Shima et al [253]. Also in this case, the theory supports a higher cross section in disagreement with the data from Shima et al One can also see that the calculation with the more realistic AV8 potential and the central 3N force is actually in better agreement with the data from Tornow et al Efforts are being directed towards a calculation of this cross section based on the AV18+UIX with the LIT method [258].…”