Precision measurement of 65Zn electron-capture decays with the KDK coincidence setup

IF 2.8 1区 物理与天体物理 Q2 PHYSICS, NUCLEAR Nuclear Data Sheets Pub Date : 2023-06-01 DOI:10.1016/j.nds.2023.04.003
L. Hariasz , P.C.F. Di Stefano , M. Stukel , B.C. Rasco , K.P. Rykaczewski , N.T. Brewer , R.K. Grzywacz , E.D. Lukosi , D.W. Stracener , M. Mancuso , F. Petricca , J. Ninkovic , P. Lechner , KDK collaboration
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Abstract

65Zn is a common calibration source, moreover used as a radioactive tracer in medical and biological studies. In many cases, γ-spectroscopy is a preferred method of 65Zn standardization, which relies directly on the branching ratio of Jπ(65Zn) = 5/2 → Jπ(65Cu) = 5/2 via electron capture (EC*). We measure the relative intensity of this branch to that proceeding directly to the ground state (EC0) using a novel coincidence technique, finding IEC0/IEC* = 0.9684 ± 0.0018. Re-evaluating the decay scheme of 65Zn by adopting the commonly evaluated branching ratio of Iβ+ = 1.4271(7)% we obtain IEC* = (50.08 ± 0.06)%, and IEC0 = (48.50 ± 0.06)%. The associated 1115 keV gamma intensity agrees with the previously reported NNDC value, and is now accessible with a factor of ∼2 increase in precision. Our re-evaluation removes reliance on the deduction of this gamma intensity from numerous measurements, some of which disagree and depend directly on total activity determination. The KDK experimental technique provides a new avenue for verification or updates to the decay scheme of 65Zn, and is applicable to other isotopes.

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用KDK符合装置精确测量65Zn电子捕获衰减
65Zn是一种常见的校准源,而且在医学和生物学研究中用作放射性示踪剂。在许多情况下,γ能谱是65Zn标准化的首选方法,它直接依赖于Jπ(65Zn)=5/2−→ Jπ(65Cu)=5/2−通过电子捕获(EC*)。我们使用一种新的符合技术测量了该分支与直接进入基态(EC0)的分支的相对强度,发现IEC0/IEC*=0.9684±0.0018。通过采用通常评估的Iβ+=1.4271(7)%的分支比重新评估65Zn的衰变方案,我们获得了IEC*=(50.08±0.06)%和IEC0=(48.50±0.06。我们的重新评估消除了对从大量测量中推断伽马强度的依赖,其中一些测量不一致,直接取决于总活动的确定。KDK实验技术为65Zn衰变方案的验证或更新提供了一条新的途径,并适用于其他同位素。
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来源期刊
Nuclear Data Sheets
Nuclear Data Sheets 物理-物理:核物理
CiteScore
7.80
自引率
5.40%
发文量
22
审稿时长
>12 weeks
期刊介绍: The Nuclear Data Sheets are current and are published monthly. They are devoted to compilation and evaluations of experimental and theoretical results in Nuclear Physics. The journal is mostly produced from Evaluated Nuclear Structure Data File (ENSDF), a computer file maintained by the US National Nuclear Data Center
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