Diffuse galactic gamma-rays: Constraining cosmic-ray origin and propagation

We have developed a model which aims to reproduce observational data of man y kinds related to cosmic-ray (CR) origin and propagation: direct measureme nts of nuclei, antiprotons, electrons and positrons, gamma-rays, and synchr otron radiation. Our main results include evaluation of diffusion/convectio n and reacceleration models, estimates of the halo size, calculations of th e interstellar positron and antiproton spectra, evaluation of alternative h ypotheses of nucleon and electron interstellar spectra, and computation of the Galactic diffuse gamma-ray emission. Recently our CR propagation code h as been generalized to include fragmentation networks of arbitrary complexi ty. The code can now provide an alternative to leaky-box calculations for f ull isotopic abundance calculations and has the advantage of including the spatial dimension which is essential for radioactive nuclei. Preliminary pr edictions for sub-Fe/Fe, Be-10/Be-9 and Al-26/Al-27 are presented in antici pation of new experimental isotopic data. We show that combining informatio n from classical CR studies with gamma-ray and other data leads to tighter constraints on CR origin and propagation.