1- HE- 3 LANL EVAL-AUG01 G.M. HALE DIST- ----ENDF/B-VI MATERIAL 225 -----INCIDENT HELIUM-3 DATA ------ENDF-6 FORMAT ***************************************************************** *MF=3, integrated cross sections: 3He(3he,3he)3He (MT=2) and 3He(3he,2p)alpha (MT=111) calculated from charge-symmetric R-matrix analysis of the T=1 part of the A=6 system, that fit t+t and 3He(3he,p) data at energies up to 2.2 MeV. *MF=6, angle and energy distributions: 3He(3he,3he)3He (MT=2) Legendre moments were calculated from the charge-symmetric, A=6, T=1 R-matrix analysis that included the t+t elastic scattering data of Holm and Argo. Proton and alpha spectra for the 3He(3he,2p)alpha (MT=111) reaction were calculated using a three-body resonance model, including the p+5Li(g.s.) and 4He+p-p resonances, taking into account exchange contributions that arise from symmetrizing in the identical protons. The relative amplitudes of the resonant contributions were taken to be the same as those for the t+t reaction, which were determined by a measurement of the neutron spectrum by Wong et al. [NP 71 (1965) 106] at Et = 50 keV. Although calculated data are given for some reactions at energies up to 20 MeV, they should be used with caution at energies above 2.2 MeV, since that was the upper limit of data included in the analysis. ***************************************************************** 1 451 40 0 3 2 4 0 3 111 30 0 6 2 109 0 6 111 2374 0