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Statistical sensitivity of the nEDM apparatus at PSI to n - n' oscillations

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conference contribution
posted on 2023-06-07, 08:22 authored by Christopher Abel, N J Ayres, G Bison, K Bodek, V Bondar, P-J Chiu, M Daum, S Emmenegger, P Flaux, L Ferraris-Bouchez, Clark GriffithClark Griffith, Z D Grujic, N Hild, K Kirch, P A Koss, others
The neutron and its hypothetical mirror counterpart, a sterile state degenerate in mass, could spontaneously mix in a process much faster than the neutron ß-decay. Two groups have performed a series of experiments in search of neutron - mirror-neutron (n - n')oscillations. They reported no evidence, thereby setting stringent limits on the oscillation time tnn. Later, these data sets have been further analyzed by Berezhiani et al.(2009-2017), and signals, compatible with n - n' oscillations in the presence of mirror magnetic fields, have been reported. The Neutron Electric Dipole Moment Collaboration based at the Paul Scherrer Institute performed a new series of experiments to further 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 µT and 20 µT. The choice of these run configurations ensures a reliable overlap in settings with the previous efforts and also improves the sensitivity to test the signals. We also elaborate on the technique of normalizing the neutron counts, making such a counting experiment at the ultra-cold neutron source at the Paul Scherrer Institute possible. Furthermore, the magnetic field characterization to meet the requirements of this n - n oscillation search is demonstrated. Finally, we show that this effort has a statistical sensitivity to n - n' oscillations comparable to the current leading constraints for B' = 0.

History

Publication status

  • Published

File Version

  • Published version

Journal

EPJ Web of Conferences

ISSN

2100-014X

Publisher

EDP Sciences

Volume

219

Page range

1-9

Article number

a07001

Event name

PPNS 2018 - International Workshop on Particle Physics at Neutron Sources

Event location

Grenoble, France

Event type

workshop

Event date

24-26 May 2018

ISBN

9782759890828

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Experimental Particle Physics Research Group Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2019-05-03

First Open Access (FOA) Date

2020-01-02

First Compliant Deposit (FCD) Date

2019-04-25

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