Performing the differential decay curve method on ? -ray transitions with unresolved Doppler-shifted components
Performing the differential decay curve method on ? -ray transitions with unresolved Doppler-shifted components
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对 执行微分衰减曲线方法？
DOI：
10.1016/j.nima.2019.162965
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Barber L
中科院分区：
文献类型：
--
作者：
Barber L
本文提出了一种利用微分衰变曲线法（DDCM）测量γ射线强度的新方法--未分辨多普勒频移分量法（UDCM）。UDCM允许使用γ射线跃迁执行DDCM分析，对于γ射线跃迁，完全多普勒频移和退化分量在能量上是不可分辨的，因此被检测为单个峰值。这种技术被用来测量已知的寿命的yrast 2 1+状态在50 Mn的人口减少过渡，不具有可分辨的完全多普勒频移和退化的组件。通过应用UDCM测量的寿命与2 1+状态的标准DDCM测量一致。使用UDCM允许使用较小的γ射线能量、较小的反冲速度以及在某些情况下具有较小的不确定性的跃迁来进行DDCM寿命测量。与标准DDCM分析相比，UDCM分析也独立于完全多普勒频移和退化分量的宽度，因此不需要确定它们。
A new method of extracting the γ-ray intensities necessary to perform lifetime measurements using the differential decay curve method (DDCM) is presented in this work, the unresolved Doppler-shifted components method (UDCM). The UDCM allows for a DDCM analysis to be performed using a γ-ray transition for which the fully Doppler-shifted and degraded components are unresolvable in energy and so are detected as a single peak. This technique was used to measure the known lifetime of the yrast 2 1+ state in 50 Mn with a depopulating transition that does not have resolvable fully Doppler-shifted and degraded components. The lifetime measured through applying the UDCM was consistent with the standard DDCM measurement of the 2 1+ state. Use of the UDCM allows for DDCM lifetime measurements to be made using transitions of smaller γ-ray energies, smaller recoil velocities and, in some cases, with a smaller uncertainty. In contrast to a standard DDCM analysis, a UDCM analysis is also independent of the widths of the fully Doppler-shifted and degraded components and as a result they do not need to be determined.