Isospin dependence of electromagnetic transition strengths among an isobaric triplet

Isospin dependence of electromagnetic transition strengths among an isobaric triplet
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同位素三重态电磁跃迁强度的同位旋依赖性

DOI:
10.1016/j.physletb.2019.134835
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发表时间:
2019
期刊:
影响因子:
4.4
通讯作者:
Boso A
Boso A
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Boso A

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用FRS-LYCCA-AgATA装置在GSI上测量了Jπ=2+→0+,ΔT=0,T=1跃迁的电四极矩阵元Mp。这使得可以通过测试Mp关于Tz的线性来直接了解感兴趣状态的同位旋纯度。为了控制系统误差,使用相同的反应机制研究了T=1三重态中的核对。用两种不同的方法得到了Mp值:(I)用相对论库仑激发实验测量了46Cr和46Ti的寿命;(Ii)首次采用“伸展靶”技术测量了46V和46Ti的寿命。在三重态上观察到一个恒定值Mp。在FP壳层内进行的壳层模型计算未能再现这种意想不到的趋势,表明需要更广泛的价空间。这一结果得到了与实验数据的很好的一致,该相互作用允许从潜在的SD壳层激发。对完全T=1同位旋三重态的所有已发表数据的线性规律进行了检验。
Electric quadrupole matrix elements, M p, for the J π= 2+→ 0+, Δ T= 0, T= 1 transitions across the A= 46 isobaric multiplet 46 Cr-46 V-46 Ti have been measured at GSI with the FRS-LYCCA-AGATA setup. This allows direct insight into the isospin purity of the states of interest by testing the linearity of M p with respect to T z. Pairs of nuclei in the T= 1 triplet were studied using identical reaction mechanisms in order to control systematic errors. The M p values were obtained with two different methodologies:(i) a relativistic Coulomb excitation experiment was performed for 46 Cr and 46 Ti;(ii) a “stretched target” technique was adopted here, for the first time, for lifetime measurements in 46 V and 46 Ti. A constant value of M p across the triplet has been observed. Shell-model calculations performed within the fp shell fail to reproduce this unexpected trend, pointing towards the need of a wider valence space. This result is confirmed by the good agreement with experimental data achieved with an interaction which allows excitations from the underlying sd shell. A test of the linearity rule for all published data on complete T= 1 isospin triplets is presented.
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