کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5495425 1528789 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Precision long-term measurements of beta-decay-rate ratios in a controlled environment
ترجمه فارسی عنوان
اندازه گیری دقیق درازمدت نسبت بتا-پراکندگی در یک محیط کنترل شده
کلمات کلیدی
اندازه گیری سرعت انفجار هسته ای، بتا پوسیدگی، نوسانات نرخ انبساط، فروپاشی هسته ای،
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
چکیده انگلیسی
We report on measurements of relative beta-decay rates of Na-22, Cl-36, Co-60, Sr-90, Cs-137 monitored for more than one year. The radioactive samples are mounted in an automated sample changer that sequentially positions the five samples in turn, with high spatial precision, in front of each of four Geiger-Müller tubes. The sample wheel, detectors, and associated electronics are housed inside a sealed chamber held at constant absolute pressure, humidity, and temperature to isolate the experiment from environmental variations. The statistical uncertainty in the count rate approaches a few times 0.01% with two weeks of averaging. Other sources of error are on a similar scale. The data are analyzed in variety of ways, comparing count rates of the various samples on one or more detectors, and comparing count rates of a particular sample across multiple detectors. We observe no statistically significant variations in the ratios of decay rates, either annual or at higher-frequency, at a level above 0.01%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 767, 10 April 2017, Pages 171-176
نویسندگان
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