Majorana and the quasi-stationary states in Nuclear Physics

Details Majorana and the quasi-stationary states in Nuclear Physics Majorana and the quasi-stationary states in Nuclear Physics

2007-02-21

arxiv.org/abs/physics/0702179v1

Physics

History and Philosophy of Physics

latex, amsart, 13 pages

Scientific paper

10.1007/s10701-007-9200-2

A complete theoretical model describing artificial disintegration of nuclei by bombardment with alpha-particles, developed by Majorana as early as in 1930, is discussed in detail alongside the basic experimental evidences that motivated it. By following the quantum dynamics of a state resulting from the superposition of a discrete state with a continuum one, whose interaction is described by a given potential term, Majorana obtained (among the other predictions) the explicit expression for the integrated cross section of the nuclear process, which is the direct measurable quantity of interest in the experiments. Though this is the first application of the concept of quasi-stationary states to a Nuclear Physics problem, it seems also that the unpublished Majorana's work anticipates by several years the related seminal paper by Fano on Atomic Physics.

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