Optimization of geomagnetic shielding based on detection efficiency Sara R. Cabo, Yasuhiro Nishimura, Sergio Luis Suárez Gómez, Laura Bonavera, Maria Luisa Sanchez, Jesús Daniel Santos and Francisco Javier de Cos Eur. Phys. J. Plus, 140 4 (2025) 291 Published online: 10 April 2025 DOI: 10.1140/epjp/s13360-025-06230-2