کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1830329 1526494 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A fast detector for single-shot positron annihilation lifetime spectroscopy
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم ابزار دقیق
پیش نمایش صفحه اول مقاله
A fast detector for single-shot positron annihilation lifetime spectroscopy
چکیده انگلیسی

When an intense sub-nanosecond positron pulse impinges upon a target, a pulse of γ-rays is created which can yield information concerning electron–positron pairs just prior to annihilation. Many conventional γ-ray detectors are unable to exploit the timing information contained within such pulses, and we describe here the development of a fast detector that is able to do so. Using a single-crystal PbF2 Cherenkov radiator coupled to a fast photomultiplier tube (PMT), we have produced a detector with a time response of ∼4 ns (primarily determined by the PMT response), as well as a low-efficiency detector with a sub-nanosecond response. Since 511 keV photons produce very little Cherenkov light, the problem of photomultiplier saturation is mitigated and this detector is therefore well suited to single-shot positron annihilation lifetime spectroscopy (SSPALS) measurements.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 580, Issue 3, 11 October 2007, Pages 1338–1343
نویسندگان
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