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The newly established New Frontiers Group ’NoMoS: Beyond the Standard Model Physics in Neutron Decay’ of the Austrian Academy of Sciences aims to search for traces of new physics in neutron beta decay with novel experimental techniques. The NoMoS group is hosted at the Stefan-Meyer-Institute for Subatomic Physics in Vienna. Precision measurements in neutron decay allow searching for physics beyond the Standard Model of particle physics. An accuracy of 10−4 in the observables corresponds to energy scales of 1−100 TeV for new particles and interactions. In order to achieve this accuracy, a new experimental technique is developed: R×B spectroscopy. An R×B spectrometer measures the momentum of charged particles by their drift in a circular magnetic field. This new, accurate method of spectroscopy will be applied to determine several correlation coefficients in neutron decay. The construction of the first R×B spectrometer, NoMoS, is part of the New Frontiers Group. For measurements at ultimate statistics, the R×B spectrometer will be installed at PERC, a new facility at the FRM II in Garching/Germany that collects electrons and protons from a large neutron decay volume. A final goal is to measure or to set limits on the Fierz interference term. This term is forbidden in the Standard Model and has not yet been measured with neutrons. A non-zero value would indicate that yet unknown charged Higgs bosons, sleptons, or leptoquarks were exchanged instead of the Standard Model W boson. Besides the physics motivation, the measurement concept and physics programme of NoMoS are presented in this paper.