https://doi.org/10.1140/epjd/e2006-00052-0
Relaxation of spin polarized 3He by magnetized ferromagnetic contaminants
Part III
1
Institut für Physik, 55099 Mainz, Germany
2
Physikalisch-Technische Bundesanstalt, 10587 Berlin, Germany
3
Schott AG, Mainz, Germany
Corresponding authors: a wheil@mail.uni-mainz.de - b ernst.otten@uni-mainz.de
Received:
26
August
2005
Revised:
19
December
2005
Published online:
14
March
2006
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 
m
and a remanent magnetic moment of the order of m ≈O(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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006
