N J Ayres, Z Berezhiani, G Bison, K Bodek, V Bondar, P-J Chiu, M Daum, C B Doorenbos, S Emmenegger, K Kirch, V Kletzl, J Krempel, B Lauss, D Pais, I Rienäcker, D Ries, D Rozpędzik, P Schmidt-Wellenburg, K S Tanaka, J Zejma, N Ziehl, G Zsigmond
In a search for potential signals of neutron (n) to mirror-neutron (n^{'}) oscillations, a collaboration centered at the Paul Scherrer Institute investigated the remaining parameter space claimed by anomalies with a dedicated high-sensitivity apparatus. An elaborate magnetic-field-mapping analysis and Monte Carlo simulation of the cumulative n-n^{'} oscillation probabilities along the neutron trajectories inside the storage vessel complemented the neutron data analysis. Magnetic fields were scanned in the range 5<B<109 μT. No evidence of anomalous neutron losses was found. Consequently, new limits for the n-n^{'} oscillation time constant were set. The parameter space, previously claimed for potential signals, has been excluded to 99.98%.