Relaxation of spin polarized 3He by magnetized ferromagnetic contaminants

Part III
  • J. Schmiedeskamp
  • H.-J. Elmers
  • W. Heil
  • E. W. Otten
  • Yu. Sobolev
  • W. Kilian
  • H. Rinneberg
  • T. Sander-Thömmes
  • F. Seifert
  • J. Zimmer
Atomic Physics

Abstract.

In the first in a series of three papers on wall relaxation of spin polarized 3He we have reported on a breakdown of relaxation times which is observed after exposing the 3He containing glass cells to a strong magnetizing field. In this third paper we give a quantitative analysis of this phenomenon, based on magnetic signal detection by means of SQUIDs, on the pressure dependence of relaxation times in magnetized cells, as well as on Monte Carlo simulations of 3He-relaxation in a macroscopic dipole field. Our analysis allows to identify the contaminants as being aggregates of dust-like Fe3O4 particles (magnetite) with a radius \(R \approx 10~\mu\)m and a remanent magnetic moment of the order of m ≈O(10\(^{-10}~\)A m2). The particles are located at or close to the inner glass surface.

PACS.

33.25.+k Nuclear resonance and relaxation 34.50.Dy Interactions of atoms and molecules with surfaces; photon and electron emission; neutralization of ions 67.65.+z Spin-polarized hydrogen and helium 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Authors and Affiliations

  • J. Schmiedeskamp
    • 1
  • H.-J. Elmers
    • 1
  • W. Heil
    • 1
  • E. W. Otten
    • 1
  • Yu. Sobolev
    • 1
  • W. Kilian
    • 2
  • H. Rinneberg
    • 2
  • T. Sander-Thömmes
    • 2
  • F. Seifert
    • 2
  • J. Zimmer
    • 3
  1. 1.Institut für PhysikMainzGermany
  2. 2.Physikalisch-Technische BundesanstaltBerlinGermany
  3. 3.Schott AGMainzGermany

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