Yields of Photonuclear Reactions with 320-Mev X-Rays. II. Interpretation of Results

It is convenient to separate the yields of radio-nuclides obtained in the work described in the preceding paper into two groups. The first group consists of the yields of nuclides which are only one or two mass units lighter than the target. All of the yields in this group, and especially those corresponding to ($\gamma , n$) reactions, are relatively large. They are due mainly to photons in the giant resonance region ($h\nu \sim 20$ Mev) of the x-ray spectrum, and account for most of the nuclear events produced in mediumweight targets by 320-Mev x-rays.