A precision Lamb-shift polarimeter for the polarized gas target at ANKE/COSY

被引：0

作者：

Engels, R ^{[1
]}

Emmerich, R ^{[1
]}

Ley, J ^{[1
]}

Mikirtytchiants, M ^{[1
]}

Schieck, HPG ^{[1
]}

Rathmann, F ^{[1
]}

Seyfarth, H ^{[1
]}

Vassiliev, A ^{[1
]}

机构：

[1] Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany

来源：

SPIN 2002 | 2003年 / 675卷

关键词：

D O I：

暂无

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The Lamb-shift polarimeter [1], described here, allows the polarization measurement of a beam of hydrogen (deuterium) atoms, or of a slow proton (deuteron) beam (500 - 2000 eV) with an absolute precision better than 1% within a few s. For a hydrogen beam of 3.10(16) atoms/s, 3.10(6) photons/s are registered in a photomultiplier. The signal-to-background ratio in the Lyman-alpha spectrum is excellent, thus beam intensities of one to two orders of magnitude less would still be sufficient to carry out a precise measurement. Therefore, it will be possible to extract a few percent of the atoms from a storage cell to measure the polarization in the cell. In order to obtain absolute nuclear polarization values the polarization derived from the Lyman-alpha spectrum has to be corrected by a number of correction factors calculated with high precision from the behaviour of different components of the polarimeter.

引用

页码：897 / 901

页数：5

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