Search

We study the reaction channels 7Li+γ → n + 6Li(2.19), 7Li+γ → n + 6Li(3.56), and 7Li+γ → d + 5He(1.27) → n +d + 4He by detecting neutrons produced by photodisintegration events. We find absolute cross sections and angular dependence for 7Li+γ → n + 6Li(2.19) at photon energies 13 and 15 MeV and for 7Li + γ → n + 6Li(3.56) at the photon energy 15 MeV. The incident photons are linearly polarized and we report dependence of the cross sections on polarization. For the reaction channel 7Li + γ → d + 5He(1.27) → n + d + 4He we obtain an upper bound on its cross section at photon energies 12, 13, and 15 MeV. [ABSTRACT FROM AUTHOR]

The cross sections for the photodisintegration of 6Li have been measured for all the available reaction channels that have neutrons in the final state, except the 6Li(γ,pO ) 5He(g.s.) channel. The cross sections were measured at the photon energies, 8, 9, 10, 11, 12, 13, 15, and 15.6 MeV using linearly polarized photons, and 20, 25, 30, and 35 MeV using circularly polarized photons. Associated Legendre function coefficients are extracted for the 6Li(γ,no )5Li (g.s.) and 6Li(γ,n1) 5Li(1.49) channels. For all observed reaction channels Legendre function parametrizations are used to determine total cross sections. Comparisons with recent theoretical calculations of the total photodisintegration cross section using various nucleon-nucleon interactions are inconclusive because of the large uncertainty in the cross sections for reactions channels that are not measured. We hope that the precision of our results for specific reaction channels will prompt calculations for those reaction channels. [ABSTRACT FROM AUTHOR]

We have measured the cross section of the photoneutron reaction channel 7Li + γ → 6Li(g.s.) + n where the progeny nucleus is the ground state of 6Li. We obtained the absolute cross section at photon energies 10, 11, 12, 13, 15, 20, 25, 30, and 35 MeV and also the dependence of the cross section on polar angle for all but the highest photon energy. For the energies 10 to 15 MeV we were able to use linearly polarized photons to obtain the dependence of the cross section on the photon polarization. [ABSTRACT FROM AUTHOR]