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Searches of new physics beyond the Standard Model (SM) performed at lowenergy frontiers are complementary to experiments carried out at high energycolliders. Among the methods for testing the SM and beyond at low energies arethe precision spectrum shape and correlation coefficient measurements innuclear and neutron beta decay. In order to study tiny effects in beta spectrumshape, a special spectrometer was built. It consists of a 3D low pressure gastracker (drift chamber with hexagonal cells, signal readout at both wire ends)and plastic scintillators for triggering data acquisition and registration ofthe beta particle energy. The results of the characterization process indicatethe possibility of using such a gas tracker in a range of experiments with lowenergy electrons where beta particle tracking with minimal kinematicsdeterioration is beneficial. Application of this technique is also planned forneutron decay correlation experiments. In the paper, the first application ofthis tracker in a high-precision beta spectrum shape study is discussed. Themeasurement technique, commissioning results, and the future outlook arepresented.

Multi-Wire 3D Gas Tracker for Searching New Physics in Nuclear Beta Decay