de Haad, V.O. (2011) Proposal for the Realization of Santilli’s Comparative Test on the Gravity of Electrons and Positrons via a Horizontal Supercooled Vacuum Tube.
http://www.santilli-foundation.org/docs/deHaan-Arxiv.pdf

has been cited by the following article:

• TITLE: Implications for Antigravity Tests of Dirac’s Negative Energy Antiparticles

  AUTHORS: Ruggero Maria Santilli

  KEYWORDS: Antiprotons, Anti-Hydrogen Atom, Antigravity

  JOURNAL NAME: Journal of Applied Mathematics and Physics, Vol.12 No.5, May 17, 2024

  ABSTRACT: P. A. M. Dirac conceived antimatter in 1928 as having negative energy by allowing a consistent representation of matter-antimatter annihilation into light. To achieve compatibility with special relativity, particle physics of the early 20th century made the theoretical assumption that antiparticles have positive energy, an assumption that remains in effect as of today. In this note we prove apparently for the first time a theorem stating that positive mass antiparticles violate Dirac’s particle-antiparticle annihilation into light. We then show the consequential unsettled character of the recent gravity test of the anti-Hydrogen atom due to the positive mass of its nucleus. We conclude by suggesting that a final scientific claim on matter-antimatter gravity requires tests on particles with clear antimatter character, such as the 1994 resolutory proposal for the comparative test of the gravity of very low energy electron and positron in horizontal flight on a supercooled vacuum tube.