# Search for the correction term to Fermi’s golden rule in positron annihilation

@article{Ushioda2020SearchFT,
title={Search for the correction term to Fermi’s golden rule in positron annihilation},
author={Risa Ushioda and O.Jinnouchi and K.Ishikawa and T.Sloan},
journal={Progress of Theoretical and Experimental Physics},
year={2020}
}
• Published 2 July 2019
• Physics
• Progress of Theoretical and Experimental Physics
In the positron–electron annihilation process, finite deviations from the standard calculation based on Fermi’s golden rule are suggested in recent theoretical work. This paper describes an experimental test of the predictions of this theoretical work by searching for events with two photons from positron annihilation of energy larger than the electron rest mass ($511\,{\rm keV}$). The positrons came from a ${\rm {}^{22}Na}$ source, tagging the third photon from the spontaneous emission of…
2 Citations

## Figures and Tables from this paper

Scalar scattering amplitude in the Gaussian wave-packet formalism
• Physics
• 2020
We compute an $s$-channel $2\to2$ scalar scattering $\phi\phi\to\Phi\to\phi\phi$ in the Gaussian wave-packet formalism at the tree-level. We find that wave-packet effects, including shifts of the
New effect in wave-packet scatterings of quantum fields
• Education
• 2021
In a transition amplitude of wave-packets, e.g., that of the Φ → φφ decay process, there are in and out time boundaries for the initial Φ and ﬁnal φφ conﬁgurations, respectively, when the transition

## References

SHOWING 1-10 OF 15 REFERENCES
On experimental confirmation of the corrections to Fermi’s golden rule
• Physics
Progress of Theoretical and Experimental Physics
• 2019
Standard calculations by Fermi's golden rule involve approximations. These approximations could lead to deviations from the predictions of the standard model, as discussed in another paper. In this
Finite-size corrections to Fermi's golden rule: I. Decay rates
• Physics
• 2013
A quantum mechanical wave of a finite size moves like a classical particle and shows a unique decay probability. Because the wave function evolves according to the Schr\"{o}dinger equation, it
On the Annihilation Radiation of Positrons
The annihilation of positrons may occur either (1) when the positron is in motion, or (2) when it has already been stopped. In the first case, which will be discussed in this paper, either one or two
The Quantum Theory of the Emission and Absorption of Radiation
The new quantum theory, based on the assumption that the dynamical variables do not obey the commutative law of multiplication, has by now been developed sufficiently to form a fairly complete theory
Calculations of stopping powers of 100eV–30keV electrons in 31 elemental solids
• Physics
• 2008
We present calculated electron stopping powers (SPs) for 31 elemental solids (Li, Be, glassy C, graphite, diamond, Na, Mg, K, Sc, Ti, V, Fe, Y, Zr, Nb, Mo, Ru, Rh, In, Sn, Cs, Gd, Tb, Dy, Hf, Ta, W,
Geant4 developments and applications
• Physics
IEEE Transactions on Nuclear Science
• 2006
Geant4 is a software toolkit for the simulation of the passage of particles through matter. It is used by a large number of experiments and projects in a variety of application domains, including
Pro
• W. Gaebel
• Psychology, Medicine
European Psychiatry
• 2017
Prog
• Theor. Exp. Phys. 2019, no. 3, 033B02,
• 2019