Progress of3He spin-exchange for neutron polarization in Jülich

L. J. Chang, R. Mueller, S. Appelt, W. Häsing, A. Ioffe, Th Brückel

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3 引文 斯高帕斯(Scopus)


Nuclear spin-polarized 3He efficiently polarizes neutrons over a wide energy range including cold, thermal and hot neutron spectra by means of its strongly spin-dependent absorption of neutrons. At Forschungszentrum Jülich we are studying the optical polarization of 3He by two methods, metastable exchange and spin-exchange, in order to optimize the neutron polarization at various spectrometers of the FRJ-2 reactor. For the spin-exchange method we designed an open, refillable cell system. In contrast to the conventional sealed cells adopted at many other laboratories, we will be able to vary many crucial parameters in the 3He cell, such as gas ratios of 3He and N2, total gas pressure, and temperature while always working in the same experimental environment of a single cell. Laser polarized Rb vapor is used to polarize 3He through the spin-exchange interaction, and NMR is employed to determine the polarization of the 3He after calibration with a proton (water) NMR signal. In this paper we will report the 3He polarization and relaxation rate, T 1, observed for various gas conditions.

頁(從 - 到)e707-e710
期刊Physica B: Condensed Matter
發行號1-3 SUPPL. 1
出版狀態Published - 2004 7月 15

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 電氣與電子工程


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