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g factor of the $$12^+$$ 12 + K -isomer in $$^{174}$$ 174 W
The European Physical Journal A ( IF 2.7 ) Pub Date : 2020-11-11 , DOI: 10.1140/epja/s10050-020-00298-3
M. Rocchini , A. Nannini , G. Benzoni , E. Vigezzi , B. Melon , P. R. John , S. Bottoni , S. Ceruti , R. Avigo , P. Sona , C. A. Ur , D. Bazzacco , N. Blasi , G. Bocchi , A. Bracco , F. Camera , S. Capra , F. C. L. Crespi , E. R. Gamba , G. Georgiev , A. Giaz , A. Gottardo , S. Leoni , R. Menegazzo , D. Mengoni , C. Michelagnoli , B. Million , V. Modamio , A. I. Morales , D. R. Napoli , M. Ottanelli , L. Pellegri , A. Perego , J. J. Valiente-Dobón , O. Wieland

The g factor of the \(12^+\) K-isomer in \(^{174}\)W has been measured by means of the time-differential perturbed angular distribution technique as \(g(12^+)=+0.304(11)\). In addition, the half-life of the isomer has been remeasured as \(T_{1/2}(12^+)=124(8)\) ns, in agreement with the literature value and confirming the anomalous hindrance F of the E2 transition to the \(10^+\) level of the ground state band with respect to the \(\gamma \)-tunnelling model prediction. The measured g factor has been compared with estimates based on experimental g factors from odd-mass isotopes in the same mass region and with Nilsson model calculations. The results establish unique features of the \(12^+\) K-isomer in \(^{174}\)W, which can possess a non-pure intrinsic configuration and/or can be characterised by values of the intrinsic quadrupole moment \(Q_0\) and the rotational g factor \(g_R\) significantly different with respect to the majority of K-isomers at mass \(A \approx 180\).



中文翻译:

$ 12 ^ + $$ 12 + K-异构体的g因子($ ^ {174} $$ 174 W

\(^ {174} \) W中\(12 ^ + \)K-异构体的g因子已通过时差摄动角分布技术测量为\(g(12 ^ +)= + 0.304(11)\)。另外,异构体的半衰期已经被重新测量作为\(T_ {1/2}(12 ^ +)= 124(8)\)  NS,与文献值一致,并确认异常阻˚F的相对于\(\ gamma \)-隧道模型预测,E 2过渡到基态带的\(10 ^ + \)水平。已将测得的g因子与基于实验g的估计值进行了比较 来自相同质量区域中奇数质量同位素的各种因子,并采用Nilsson模型计算。结果建立了\(^ {174} \) W中\(12 ^ + \) K-异构体的独特特征,该特征可以具有非纯本征结构和/或可以由本征四极矩的值来表征\(Q_0 \)和旋转g因子\(g_R \)相对于质量为\(A \大约180 \)的大多数K-异构体明显不同。

更新日期:2020-11-12
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