Nonlinear Phenomena in Complex Systems, 2025, Vol.28, No.4, pp.397

NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2025, Vol.28, No.4, pp.397 - 415

Impact of Graphene Currents on Positronium Anion Beam Produced through Internal Photon-Energy Conversion in ⁶⁰Co and ¹³⁷Cs Decays

H. V. Grushevskaya and A. I. Timoshchenko

Development of detection systems such as scintillation crystal/carbon-nanotube bilayer systems is needed for nuclear applications. It allows to clarify the nature of nuclear decays with creation of electron-positron pairs and to search for double electron-capture decays and neutrinoless double β-decay processes for discovering Majorana particles. We design a novel system composed of scintillation crystal NaI(Tl) and carbon-nanotube two-dimensional crystalline layers to record γ-radiation spectra. We perform investigations by means of the developed detector system for exploring interactions between rolled-up graphene walls of carbon nanotubes (CNTs) and ⁶⁰Co- and ¹³⁷Ce gamma rays. It was shown that CNTassembly- enhanced scattering of gamma-rays from Co-60 and Cs-137 decays occurs in an intermediate-size detector NaI(Tl) crystal. A hight-performance method based on the enhancement phenomena is offered to detect electron-positron annihilation from cascade events such as nucleus processes of internal energy conversion.We predict and experimentally confirm that the internal conversion in ⁶⁰Ni nuclei proceeds with generation of positronium ions (P_S⁻) and there can appear excited P_S⁻ states. The excess energy deposition of 3.8−3.9 keV into the detector NaI(Tl)/carbon-nanotube system is evidence of the bound electron-positron pairs from internal energy conversion in nuclei of both ⁶⁰Ni and ^137mBa.

Key words: beam, positronium, graphene radiation resistivity, Majorana-like fermion, carbon nanotube

DOI: https://doi.org/10.5281/zenodo.17950446

Full text: Acrobat PDF (2328 KB) Open Access