Nuclear Structure and Decay Data for A=169 Isobars

IF 2.7 1区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Data Sheets Pub Date : 2026-03-01 Epub Date: 2026-03-04 DOI:10.1016/j.nds.2026.02.001

M. Shamsuzzoha Basunia

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引用次数: 0

Abstract

Experimental data pertaining to all nuclei with mass number A=169 (Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Re, Os, Ir, Pt) have been evaluated. Level schemes from both radioactive decay and reaction studies are presented, along with associated tables of experimental data and adopted properties for levels and γ rays. The present evaluation for A=169 supersedes the 2008 evaluation, 2008Ba31, by C.M. Baglin.

A few highlights of this evaluation:

More extensive work on ε decay from ¹⁶⁹W is needed and new experimental work will be required to resolve a discrepancy between the J^π values deduced for a 180-keV level in ¹⁶⁹Ta based on extensive band structure from (HI,xnγ) work (J^π=1/2⁻) and TDPAD measurements (J=5/2).

Low lying states of ¹⁶⁹Os were studied via fine structure of ¹⁷³Pt α decay in 2014ThZZ. The Eαs feeding the g.s. of ¹⁶⁹Os in 2008Ba31 are separated well into two consistent groups to feed the g.s. and the newly proposed state at 34.84 keV. Based on the studies of 2014ThZZ and 2021Zh52, the g.s. spin-parity assignment of ¹⁶⁹Os has been proposed to be (7/2⁻) from (5/2⁻).

The ¹⁶⁹Ir g.s. half-life and alpha emission branching reported in 2012Th13 from ¹⁷³Au α decay measurements are preferred over the values in 2005Sc22. The reported half-life value in 2005Sc22 for ¹⁶⁹Ir g.s. is discrepant and the research work was carried out in the same lab of 2012Th13.

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A=169等压线的核结构和衰变数据

对质量数为A=169的所有原子核（Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu、Hf、Ta、W、Re、Os、Ir、Pt）的实验数据进行了计算。本文介绍了放射性衰变和反应研究的能级方案，以及相关的实验数据表和所采用的能级和γ射线的性质。目前对A=169的评价取代了2008年C.M. Baglin的评价，2008Ba31。该评估的几个亮点是：需要对169W的ε衰减进行更广泛的研究，并且需要新的实验工作来解决基于（HI,xnγ）工作（Jπ=1/2−）和TDPAD测量（J=5/2）的广泛带结构在169Ta中推导出的180 kev电平的Jπ值之间的差异。通过173Pt α在2014 - thzz的精细结构，研究了169Os的低洼态。在2008Ba31中，e - αs可以很好地分成两组，分别喂给g - s和34.84 keV。基于2014ThZZ和2021Zh52的研究，我们提出169Os的gs自旋奇偶校验赋值从（5/2−）为（7/2−）。从173Au α衰变测量中得到的169Ir g.s半衰期和α发射分支比2005年的结果更有价值。在2005年12月22日报道的169Ir gs的半衰期值存在差异，研究工作在2012年12月13日的同一实验室进行。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Data Sheets 物理-物理：核物理

CiteScore

7.80

自引率

5.40%

发文量

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