Abstract
The geometrical location of a narrow resonance within an extended gas target moves along the beam axis as the beam energy is varied. This location changes however for a constant gas target pressure, if the ion beam intensity is varied. It is also found, that - for a constant ion beam current - the expected location differs from that observed as the gas pressure is increased. It is concluded, that the gas target densities along the beam axis depend on both the energy loss per unit length and the ion beam current, i.e. the dissipated power in the gas. This dissipated power increases in turn the temperature of the target gas. Effects greater than 10% are seen for dissipated powers greater than 20 mW/mm. The effects have been studied at the E p = 278 keV resonance of the 14N(p, γ) 15 O reaction.
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