A walk-free centroid method for lifetime measurement of <sup>207</sup>Pb 569.7 keV state

Jiahui Gu; Jingyi Liu; Genlai Xiao; Zhongming Liu; Yan Li; Shuanghui Shi

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A walk-free centroid method for lifetime measurement of ²⁰⁷Pb 569.7 keV state

更新时间：2022-08-16

- A walk-free centroid method for lifetime measurement of ²⁰⁷Pb 569.7 keV state
- Nuclear Techniques Vol. 11, Issue 2, (1988)
- 作者机构：
  
  中国科学院上海原子核研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：16 January 1987，
  
  Published：1988-02
- 稿件说明：
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Jiahui Gu, Jingyi Liu, Genlai Xiao, et al. A walk-free centroid method for lifetime measurement of ²⁰⁷Pb 569.7 keV state[J]. Nuclear techniques, 1988, 11(2): 29-33,62.
DOI：

Jiahui Gu, Jingyi Liu, Genlai Xiao, et al. A walk-free centroid method for lifetime measurement of ²⁰⁷Pb 569.7 keV state[J]. Nuclear techniques, 1988, 11(2): 29-33,62. DOI：

摘要

本工作采用三参数数据获取和离线分析，对延迟谱数据处理作了改进，发展了特殊类型的矩心漂移法。一次测量得正向和反向延迟符合谱，它们各自重心间的差，即为平均寿命

。在矩心无漂移法计算中不需要测量瞬发时间谱，从而解决了由于瞬发谱和延迟符合谱不同时测量、电子学仪器和测量条件改变造成的影响。把正向状态和反向状态下所得的寿命取平均值，减少了系统误差。我们的实验结果

＝129.5±1.4ps。把实验约化跃迁几率与各理论值进行比较，结果与单质子假设符合很好。

Abstract

An improvement have been made in acquiring data of delayed coincidence spectra with ND-620 data acquisition system and off-line data analysis program. The delayed and anti-delayed coincidence spectra can be obtianed in one run. The difference of their centroids is the mean lifetime

. The centroid position of a delayed coincidence spectrum is the zero time of another delayed coincidence spectrum

so the requirement of measuring prompt time spectrum is avoided. The walk of prompt and delayed coincidence spectrum coming from different run are resolved and the walk during the measurment is compensated partly.

The delayed coincidence time spectra of

207

Pb 569.7 keV state are measured and the half lifetime is calculated via three different methods (slop method

convolution method

centroid shift). The final value of half lifetime is 129.5±1.4ps. The experimental reduced transition probability is compared with theoretical values.

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references

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顾嘉辉等，原子核物理， 9 （ 1987 ）， 3 ： 285 。

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M. R. Schmorak et al . , Nucl. Data Sheets , B5 ( 1971 ), 207 .

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A walk-free centroid method for lifetime measurement of 207Pb 569.7 keV state

DOI：

摘要

Abstract

关键词

Keywords

references

A walk-free centroid method for lifetime measurement of ²⁰⁷Pb 569.7 keV state