Lisotti, ChiaraO’Hare, Ciaran A.J.Baracchini, ElisabettaBashu, Victoria U.Bignell, Lindsey J.Dastgiri, FerdosGhrear, MajdLane, Gregory J.McKie, Lachlan J.McNamara, Peter C.Torelli, Samuele2025-05-232025-05-231434-6044http://www.scopus.com/inward/record.url?scp=85206140859&partnerID=8YFLogxKhttps://hdl.handle.net/1885/733751908Cygnus is a proposed global network of large-scale gas time projection chambers (TPCs) with the capability of directionally detecting nuclear and electron recoils at ≳keV energies. The primary focus of Cygnus so far has been the detection of dark matter, with directional sensitivity providing a means of circumventing the so-called “neutrino fog”. However, the excellent background rejection and electron/nuclear recoil discrimination provided by the 3-dimensional reconstruction of ionisation tracks could turn the solar neutrino background into an interesting signal in its own right. For example, directionality would facilitate the simultaneous spectroscopy of multiple different flux sources. Here, we evaluate the possibility of measuring solar neutrinos using the same network of gas TPCs built from 10 m3-scale modules operating under conditions that enable simultaneous sensitivity to both dark matter and neutrinos. We focus in particular on electron recoils, which provide access to low-energy neutrino fluxes like pp, pep, 7Be, and CNO. An appreciable event rate is already detectable in experiments consisting of a single 10 m3 module, assuming standard fill gases such as CF4 mixed with helium at atmospheric pressure. With total volumes around 1000 m3 or higher, the TPC network could be complementary to dedicated neutrino observatories, whilst entering the dark-matter neutrino fog via the nuclear recoil channel. We evaluate the required directional performance and background conditions to observe, discriminate, and perform spectroscopy on neutrino events. We find that, under reasonable projections for planned technology that will enable 10–30-degree angular resolution and ∼10% fractional energy resolution, Cygnus could be a competitive directional neutrino experiment.CLand CAJO are supported by the Australian Research Council under the grant number DE220100225. MG is supported by the U.S. Department of Energy (DOE) via Award Number DE-SC0010504. VUB, LJB, FD, GJL, PCM and LJM are supported by the Australian Research Council under grant number CE200100008. We thank the members of the CYGNO collaboration for discussions and their support of this project. We also thank Nicole Bell and Jayden Newstead for comments on a draft of this paper, and Mattias Blennow for spotting a typo in an earlier version. CL and CAJO are supported by the Australian Research Council under the grant number DE220100225. MG acknowledges support from the U.S. Department of Energy (DOE) via Award Number DE-SC0010504. VUB, LJB, FD, GJL, PCM and LJM are supported by the Australian Research Council under grant number CE200100008.enPublisher Copyright: © The Author(s) 2024.202410.1140/epjc/s10052-024-13392-385206140859