Excitation functions of theI127(π, πxn)reactions in the region of the (3,3) re

Abstract

Excitation functions have been determined for the formation of ten iodine nuclides (" I -' I) in the interaction of 60 -350 MeV m+ and m with ' I. The contribution of various reaction mechanisms has been estimated from the systematic features of the excitation functions and isotopic yield distributions with the aid of cross sections obtained for the production of various isobaric xenon nuclides, cross-section results for 500 MeV proton bombardment of ' I, and comparison with Monte Carlo cascade-evaporation calculations. It is found that, with varying importance, mechanisms involving direct neutron knockout, pion inelastic scattering plus evaporation, pion absorption, and pion charge exchange contribute to the observed yields. NUCLEAR REACTIONS ' 'I(m. -+,m.xn), x =1 -10, excitation functions (activation), T"=60 -350 MeV. KI targets. Deduced reaction mechanisms.

Positron emission intensity in the decay of120gI

“…However, the β ϩ /EC decay ratio could not be estimated with certainty, since the radioiodine obtained via the decay of radioxenon contained 120g I, 121 I and 123 I in admixture [4]. Later decay scheme investigations on highly neutron deficient radioisotopes of iodine involved direct production of radioiodine via high energy reactions, for example the (p,xn) process on tellurium at E p Յ 150 MeV [5], (γ,7n) reaction on 127 I at 830 MeV [6], (e,e′7n) and (π,π′7n) reactions on 127 I [7,8], (p,spall) process on La [9,10], (γ,spall) † Dedicated to the memory of Professor Alfred P. Wolf.…”