Observation of gravitationally induced vertical striation of polarized ultracold neutrons by spin-echo spectroscopy

Abstract : We describe a spin-echo method for ultracold neutrons (UCNs) confined in a precession chamber and exposed to a $|B_0|=1~\text{\mu T}$ magnetic field. We have demonstrated that the analysis of UCN spin-echo resonance signals in combination with knowledge of the ambient magnetic field provides an excellent method by which to reconstruct the energy spectrum of a confined ensemble of neutrons. The method takes advantage of the relative dephasing of spins arising from a gravitationally induced striation of stored UCN of different energies, and also permits an improved determination of the vertical magnetic-field gradient with an exceptional accuracy of $1.1~\text{pT/cm}$. This novel combination of a well-known nuclear resonance method and gravitationally induced vertical striation is unique in the realm of nuclear and particle physics and should prove to be invaluable for the assessment of systematic effects in precision experiments such as searches for an electric dipole moment of the neutron or the measurement of the neutron lifetime.
Type de document :
Article dans une revue
Physical Review Letters, American Physical Society, 2015, 115, pp.162502. 〈10.1103/PhysRevLett.115.162502〉
Liste complète des métadonnées

http://hal.in2p3.fr/in2p3-01159876
Contributeur : Emmanuelle Vernay <>
Soumis le : jeudi 4 juin 2015 - 09:01:18
Dernière modification le : mardi 24 avril 2018 - 01:46:52

Lien texte intégral

Identifiants

Collections

Citation

S. Afach, N. J. Ayres, G. Ban, G. Bison, K. Bodek, et al.. Observation of gravitationally induced vertical striation of polarized ultracold neutrons by spin-echo spectroscopy. Physical Review Letters, American Physical Society, 2015, 115, pp.162502. 〈10.1103/PhysRevLett.115.162502〉. 〈in2p3-01159876〉

Partager

Métriques

Consultations de la notice

243