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29 March 2024
 
  » arxiv » 1811.1906

 Article overview


Statistical sensitivity of the nEDM apparatus at PSI to neutron mirror-neutron oscillations
C. Abel ; N. Ayres ; G. Bison ; K. Bodek ; V. Bondar ; P.-J. Chiu ; M. Daum ; S. Emmenegger ; P. Flaux ; L. Ferraris-Bouchez ; W. C. Griffth ; N. Hild ; K. Kirch ; P. A. Koss ; A. Kozela ; J. Krempel ; B. Lauss ; T. Lefort ; A. Leredde ; P. Mohanmurthy ; O. Naviliat-Cuncic ; D. Pais ; F. M. Piegsa ; G. Pignol ; M. Rawlik ; D. Rebreyend ; D. Ries ; S. Roccia ; D. Rozpedzik ; P. Schmidt-Wellenburg ; A. Schnabel ; N. Severijns ; J. Thorne ; R. Virot ; G. Zsigmond ;
Date 6 Nov 2018
AbstractThe Neutron and its mirror counterpart, a sterile state degenerate in mass, could spontaneously mix in a process much faster than the neutron $eta$-decay. Two separate groups have performed series of experiments in search of mirror-neutron oscillations and reported having found no evidence, setting stringent limits on the oscillation time $ au_{nn’}$. Recently, these data sets have been further analyzed, and statistically significant signals compatible with neutron mirror-neutron oscillations in the presence of mirror magnetic fields, have been found. The current leading constraint on $ au_{nn’}$ does not exclude these signals. The neutron Electric Dipole Moment Collaboration based at the Paul Scherrer Institute performed a new series of experiments to test these signals. In this paper, we describe and motivate our choice of run configurations with an optimal filling time of $29~$s, storage times of $180~$s and $380~$s, and applied magnetic fields of $10~mu$T and $20~mu$T. The choice of these run configurations provide for a reliable overlap in performance with the previous efforts and also optimizes the sensitivity to test the signals. We also elaborate upon the technique of normalizing the neutron counts, making such a counting experiment based on the ultra-cold neutron source at Paul Scherrer Institute possible. Furthermore, the magnetic field characterization has been demonstrated to meet the requirements of this neutron mirror-neutron search. Finally, we show that this effort has a statistical sensitivity comparable to the current leading constraints for neutron mirror-neutron oscillation.
Source arXiv, 1811.1906
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