Treatment of background in ? - ? fast-timing measurements
Treatment of background in ? - ? fast-timing measurements
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背景处理？
DOI：
10.1016/j.nima.2019.03.028
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Gamba E
中科院分区：
文献类型：
--
作者：
Gamba E
γ-γ快速计时测量中的背景特性在测量数十皮秒量级的寿命时至关重要。在这项工作中，广泛讨论了时序背景的性质、组成和行为，并提出了E γ-E γ-E γ立方体中使用的背景减法对E γ-E γ-Δ T立方体的适应性。该方法应用于252cf裂变数据，显示出非常低的峰背景比（小于0.5），这些数据是由来自Gammasphere的51个HPGe探测器和25个LaBr 3 （Ce）闪烁体组成的混合阵列收集的。提出了两种不同的方法：“插值”法和“三样本”法。两者均用于测量110 Ru中2+态的寿命，分别得到τ= 483 (38) ps和τ= 445 (34) ps，两者均在文献值τ l= 462 (29) ps的一个标准差内。114 Pd中2+态的寿命也采用三样本方法测量，得到的寿命为τ= 104 (12) ps，与文献中τ l= 118 (20) ps的寿命一致。
Background characterisation in γ-γ fast-timing measurements is of essential importance when lifetimes of the order of tens of picoseconds are being measured. In this work, the nature, composition and behaviour of the timing background is extensively discussed and an adaptation of the background subtraction method used in E γ-E γ-E γ cubes to the case of E γ-E γ-Δ T cubes, is presented. This is applied to 252 Cf fission data, showing very low peak-to-background ratios (less than 0.5), collected using a hybrid array made of 51 HPGe detectors from Gammasphere and 25 LaBr 3 (Ce) scintillators. Two different procedures are suggested: the “Interpolation” approach and the “Three Samples” approach. Both were used to measure the lifetime of the 2+ state in 110 Ru, and gave τ= 483 (38) ps and τ= 445 (34) ps, respectively, both within one standard deviation of the literature value of τ l= 462 (29) ps. The 2+ state in 114 Pd was also measured using the three samples approach and the lifetime obtained was τ= 104 (12) ps, consistent with the literature lifetime of τ l= 118 (20) ps.