HIGH-RESOLUTION PAIR SPECTROMETER FOR MEDIUM ENERGY PHOTONS

被引：23

作者：

ALDER, JC

GABIOUD, B

JOSEPH, C

LOUDE, JF

MOREL, N

PERRENOUD, A

PERROUD, JP

TRAN, MT

VAUCHER, B

WINKELMANN, E

RENKER, D

SCHMITT, H

ZUPANCIC, C

VONFELLENBERG, H

FRISCHKNECHT, A

HOOP, F

STRASSNER, G

TRUOL, P

机构：

[1] UNIV MUNICH,SEKT PHYS,D-8046 GARCHING,FED REP GER

[2] UNIV ZURICH,INST PHYS,CH-8001 ZURICH,SWITZERLAND

来源：

NUCLEAR INSTRUMENTS & METHODS | 1979年 / 160卷 / 01期

关键词：

D O I：

10.1016/0029-554X(79)90170-8

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The construction, performance and associated on- and off-line analysis procedures of a pair spectrometer for medium energy photons (50-150 MeV) is described. In a large aperture window frame magnet electrons and positrons from photons converting in thin gold foils are bent by 180°. The trajectories are observed with large multiwire proportional chambers. The performance of the system was tested with stopped π- and a liquid hydrogen target. The resolution is 840 keV (fwhm) at 129.4 MeV; the overall acceptance which includes solid angle probability, conversion efficiency, e+e- pattern recognition efficiency and trigger detector efficiency, is 2.5 × 10-5 (or 1.030 MeV and 4.5 × 10-5 respectively). With special care, the position of a photon line in the vicinity of the H line can be determined to an accuracy of a few keV, while the known absolute energy of the 129.4 MeV H line has been determined to an accuracy of about 0.1 MeV. © 1979.

引用

页码：93 / 114

页数：22

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