γγ符合测量中反冲电子谱的利用
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摘要
符合测量是一种常规的测量手段.除了在核物理中的应用,它还被广泛应用于基本物理参数测量、材料分析等领域.此工作讨论了反冲电子谱对γγ符合测量计数率的影响.并设计强、弱两种干扰条件下,γγ符合测量中真符合计数率随不同阈值的变化.实验结果证实,增加反冲电子谱的符合测量能够提高真符合计数率;强、弱本底干扰对总符合计数率有一定影响,但此影响可以通过数据修正的方式消除.
A coincident technique is a normal technique which has extensive applications in fields of nuclear physics,basic physical parameter measurements and material science. The influence of recoil electron on the coincident count rate is discussed. Count rate of real coincident from gamma-gamma coincidence changes with threshold in conditions of high and low background. The experimental result suggests that spectrum from recoil electron could increase count rate of real coincidence,the count rate of total coincidence would be affected by the count from background in conditions of high and low background. The effect from the background could be deduced by data correction.
A coincident technique is a normal technique which has extensive applications in fields of nuclear physics,basic physical parameter measurements and material science. The influence of recoil electron on the coincident count rate is discussed. Count rate of real coincident from gamma-gamma coincidence changes with threshold in conditions of high and low background. The experimental result suggests that spectrum from recoil electron could increase count rate of real coincidence,the count rate of total coincidence would be affected by the count from background in conditions of high and low background. The effect from the background could be deduced by data correction.
引文
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[2]Mistbetta C,Appel J A,Budnitz R J,et al.Coincidence Measurements of Single-Pion Electroproduction[J].Physical Review,1969,184(5):1487-1508.
[3]复旦大学,清华大学,北京大学,原子核物理实验方法[M].3版北京:原子能出版社,1997:190-209.
[4]彭朝华,吴小光,李广生.放射性活度的γγ符合测量[J].原子能科学技术,2001,35(3):258-262.
[5]褚晓彤,王一涵,张超,等.利用γ-γ符合测量Co放射源活度[J].大学物理,2015,34(10):57-59.
[6]Lindskog J,Sundstroem T and P S.Delayed Coincidence Measurement of the Lifetime[J].Zeit Schrift fuer Physik,1962,170:347-354.
[7]Kremer R M,Barnes C A,Chang K H,et al.Coincidencemeasurement of the 12C(α,γ)16O cros sections at low energies[J].Phys Rev Lett,1988,60(15):1475-1478.
[8]Brady E L and Deutsch M.Angular Correlation of Successive Gamma-Rays[J].Phy Rev,1950,78(5):558-566.
[9]Kahana S.Positron Annihilation in Metals[J].Phy Rev,1963,129(4):1622-1628.
[10]Procházka I.Position annihilation spectroscopy[J].Materials Structure,2001,8(2):55-60.
[11]Siegel R W.Position annihilation spectroscopy[J].Ann Rev Mater Sci,1980,10:393-425.
[12]Guo W and Gardner R P.Coincidence X-Ray fluorescence(CXRF)spectrometry[J].Advances in X-ray Analysis,2004,47:91-97.