Ultracold neutron energy spectrum and storage properties from magnetically induced spin depolarization
High Energy Physics - Experiment
2025-11-11 v1 High Energy Physics - Phenomenology
Nuclear Experiment
Abstract
We present a novel method for extracting the energy spectrum of ultracold neutrons from magnetically induced spin depolarization measurements using the n2EDM apparatus. This method is also sensitive to the storage properties of the materials used to trap ultracold neutrons, specifically, whether collisions are specular or diffuse. We highlight the sensitivity of this new technique by comparing the two different storage chambers of the n2EDM experiment. We validate the extraction by comparing to an independent measurement for how this energy spectrum is polarized through a magnetic-filter, and finally, we calculate the neutron center-of-mass offset, an important systematic effect for measurements of the neutron electric dipole moment.
Cite
@article{arxiv.2511.06884,
title = {Ultracold neutron energy spectrum and storage properties from magnetically induced spin depolarization},
author = {N. J. Ayres and G. Ban and G. Bison and K. Bodek and V. Bondar and T. Bouillaud and D. Bowles and G. L. Caratsch and E. Chanel and W. Chen and P. -J. Chiu and C. B. Crawford and V. Czamler and M. Daum and C. B. Doorenbos and M. Ferry and M. Fertl and A. Fratangelo and D. Galbinski and W. C. Griffith and Z. D. Grujic and K. Kirch and V. Kletzl and B. Lauss and T. Lefort and A. Lejuez and R. Li and K. Michielsen and J. Micko and P. Mullan and A. Mullins and O. Naviliat-Cuncic and D. Pais and F. M. Piegsa and G. Pignol and C. Pistillo and D. Rebreyend and I. Rienäcker and D. Ries and S. Roccia and D. Rozpedzik and W. Saenz-Arevalo and L. Sanchez-Real Zielniewicz and P. Schmidt-Wellenburg and E. P. Segarra and L. Segner and N. Severijns and K. Svirina and K. S. Tanaka and J. Thorne and J. Vankeirsbilck and N. von Schickh and N. Yazdandoost and J. Zejma and N. Ziehl and G. Zsigmond},
journal= {arXiv preprint arXiv:2511.06884},
year = {2025}
}