SOME EXPERIENCES USING A POSITRON-ANNIHILATION BEAM

被引：11

作者：

HAYWARD, E

DODGE, WR

PATRICK, BH

机构：

[1] National Bureau of Standards, Washington

来源：

NUCLEAR INSTRUMENTS & METHODS | 1979年 / 159卷 / 2-3期

关键词：

D O I：

10.1016/0029-554X(79)90653-0

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The NBS positron annihilation-in-flight facility is described, along with the procedure for the calibration of the positron beam energy. Details are also given of a large NaI(Tl) spectrometer used with the annihilation photon beam. Response functions of this spectrometer for photons of 15 and 31 MeV have been measured using a photon tagging scheme based on the detection of the annihilation photons in coincidence. The variation in response function caused by the presence of absorbers in front of the spectrometer has been investigated. The response function measured at 15 MeV is compared with that obtained by resonance fluorescence of the 15.1 MeV level in 12C and the branching ratios for the decay of the 15.1 MeV level to the ground state and the excited states at 4.44 and 7.66 MeV have been extracted. © 1979.

引用

页码：289 / 299

页数：11

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