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
收藏
页码:897 / 901
页数:5
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