Background-Limited Silicon Telescope Methodology for Weak Internal Pair Creation Transition in Low-Energy Deuteron-Deuteron Reactions
Abstract
A background-constrained silicon-telescope methodology has been developed to investigate recently observed internal electron-positron pair creation in low-energy deuteron-deuteron fusion. The decay of the near-threshold 0+ resonance in 4He produced in DD fusion results in an e-e+ pair sharing a total energy of 22.84 MeV. These high-energy leptons traverse thin silicon detectors and deposit only part of their kinetic energy. The resulting partial-absorption peak structure overlaps with the natural-radiation background of cosmic-ray secondaries and terrestrial gamma rays. The silicon detector telescope used in the present experiments is characterised against this background through a component-by-component model that combines a GEANT4 cosmic-ray simulation, a large-volume NaI(Tl)-constrained terrestrial-gamma propagation, and a beam-correlated neutron response. Long-duration measurements in multiple orientations and shielding configurations are used to quantify the run-to-run variability of the background and to translate it into an explicit systematic envelope on the extracted signal. The framework is then applied to the beam-on singles spectrum and the two-dimensional coincidence response, yielding a quantitative branching-ratio measurement under background-limited conditions. The methodology is directly transferable to other weak-channel searches in surface laboratories where continuum-like signals overlap with natural-radiation backgrounds.
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BibTeX
@misc{haridas2026backgroundlimited,
title = {{Background-Limited Silicon Telescope Methodology for Weak Internal Pair Creation Transition in Low-Energy Deuteron-Deuteron Reactions}},
author = {Gokul Das Haridas and K. Czerski and S. Thulichery and R. Dubey and M. Valat and N. Targosz-Ślęczka and A. Kowalska},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.28645},
eprint = {2610.28645},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.28645},
}
RIS
TY - UNPB
TI - Background-Limited Silicon Telescope Methodology for Weak Internal Pair Creation Transition in Low-Energy Deuteron-Deuteron Reactions
AU - Gokul Das Haridas
AU - K. Czerski
AU - S. Thulichery
AU - R. Dubey
AU - M. Valat
AU - N. Targosz-Ślęczka
AU - A. Kowalska
PY - 2026
DA - 2026/10/01
PB - arXiv
DO - 10.48550/arxiv.2610.28645
UR - https://arxiv.org/abs/2610.28645
AB - A background-constrained silicon-telescope methodology has been developed to investigate recently observed internal electron-positron pair creation in low-energy deuteron-deuteron fusion. The decay of the near-threshold 0^+ resonance in ^4He produced in DD fusion results in an e^-e^+ pair sharing a total energy of 22.84 MeV. These high-energy leptons traverse thin silicon detectors and deposit only part of their kinetic energy. The resulting partial-absorption peak structure overlaps with the natural-radiation background of cosmic-ray secondaries and terrestrial gamma rays. The silicon detector telescope used in the present experiments is characterised against this background through a component-by-component model that combines a GEANT4 cosmic-ray simulation, a large-volume NaI(Tl)-constrained terrestrial-gamma propagation, and a beam-correlated neutron response. Long-duration measurements in multiple orientations and shielding configurations are used to quantify the run-to-run variability of the background and to translate it into an explicit systematic envelope on the extracted signal. The framework is then applied to the beam-on singles spectrum and the two-dimensional coincidence response, yielding a quantitative branching-ratio measurement under background-limited conditions. The methodology is directly transferable to other weak-channel searches in surface laboratories where continuum-like signals overlap with natural-radiation backgrounds.
ER -