Many-Pasts Interference in β⁺ Decay and the Temporal Structure of Consistent Histories - An interpretive extension of the Feynman–Stückelberg picture within the Griffiths–Omnès–Gell-Mann–Hartle framework

We examine the Feynman–Stückelberg interpretation of the positron as an electron propagating from future to past, and ask whether the emission of a positron in nuclear β⁺ decay can be understood as the temporal inverse of a multi-path interference process. Using the 1934 Joliot–Curie aluminum-to-phosphorus-30 reaction as the concrete example, we propose that the pre-decay ³⁰P nucleus may be described as a coherent sum over alternative nuclear configurations (“many pasts”) that fan into the observed emission event, and simultaneously as a fan-in-from-the-future (a fan-out, from our present laboratory view, toward many possible futures). We formalize the proposal inside the consistent-histories framework of Griffiths, Omnès, Gell-Mann and Hartle, linking families of past nuclear configurations, via the positron world-line read as a future-to-past electron path, to the possible emission paths themselves. The present emission moment functions as a cinch-point between those families. Wheeler’s cosmic delayed-choice experiment is re-examined in the same language. A specific experimental direction is outlined. The work is offered as a foundations investigation, not as a modification of the Standard Model. The core ideas in this paper have been under continuous development since February 2015. The author acknowledges the use of Grok (xAI) for assistance with organization, structural editing, clarity improvements, and incorporation of relevant physics background. All conceptual content, arguments, and final responsibility for the work remain with the author.