In the determination of mass values or rather mass differences through the Q-value of a nuclear reaction, two energies of particles, the energy of the primary particle and the energy of the reaction product must be determined. For intensity reasons doubly focussing sector magnets are usually used for both measurements. This type of spectrometer must be calibrated since it is impossible to compute the exact shape of particle orbits. Moreover ordinary and so called “differential” hysteresis affect the performance of the spectrometer and make it necessary that a rather closely spaced set of accurately known calibration energies is available. For calibration energies, resonance energies of isolated single narrow resonances whose width is of the order of the desired accuracy and threshold energies are suitable. Resonance energies are therefore mostly those of particle capture reactions with subsequent γ de-excitation. Threshold energies are commonly those of (p, n) reactions.
KeywordsEnergy Loss Resonance Energy Radial Field Particle Orbit High Energy Loss
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