A SUMMATION-FREE BETA+ -END-POINT SPECTROMETER

被引：28

作者：

KELLER, H

KIRCHNER, R

KLEPPER, O

ROECKL, E

SCHARDT, D

SIMON, RS

KLEINHEINZ, P

LIANG, CF

PARIS, P

机构：

[1] FORSCHUNGSZENTRUM JULICH,INST KERNPHYS,W-5170 JULICH,GERMANY

[2] CTR SPECTROMETRIE NUCL & SPECTROMETRIE MASSE,F-91406 ORSAY,FRANCE

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 1991年 / 300卷 / 01期

关键词：

GERMANIUM DETECTOR; POSITRON; ELECTRONS; ENERGIES; SPECTRA; SYSTEM; BEAMS;

D O I：

10.1016/0168-9002(91)90707-W

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A beta-+-endpoint spectrometer is described, where positrons are observed in an 11 mm thick silicon detector in coincidence with subsequent gamma-rays measured in a germanium detector, and where the summing of the positron energy with the annihilation radiation is prevented by detecting both 511 keV quanta in opposite segments of a BGO ring surrounding the silicon detector. The procedure of measuring and analyzing the data is outlined for the decay of the 11/2--isomer of 149Tb; its endpoint energy is determined to be 1853(10) keV, in agreement with the literature. The accuracy and reliability of beta-+-endpoint measurements is discussed in comparison to the EC/beta-+-ratio method.

引用

页码：67 / 76

页数：10

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