First measurement of the B(E2; 3/2(-) -> 1/2(-)) transition strength in Be-7: Testing ab initio predictions for A=7 nuclei

Henderson S. L.; Ahn T.; Caprio M. A.; Fasano P. J.; Simon A.; Tan W.; OMalley P.; Allen J.; Bardayan D. W.; Blankstein D.; Frentz B.; Hall M. R.; Kolata J. J.; McCoy A. E.; Moylan S.; Reingold C. S.; Strauss S. Y.; Torres-Isea R. O.

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First measurement of the B(E2; 3/2(-) -> 1/2(-)) transition strength in Be-7: Testing ab initio predictions for A=7 nuclei

机译：第一次测量B（E2; 3/2（ - ） - > 1/2（ - ））转变强度在BE-7：测试A = 7个核的AB初始预测

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Electromagnetic observables are able to give insight into collective and emergent features in nuclei, including nuclear clustering. These observables also provide strong constraints for ab initio theory, but comparison of these observables between theory and experiment can be difficult due to the lack of convergence for relevant calculated values, such as E2 transition strengths. By comparing the ratios of E2 transition strengths for mirror transitions, we find that a wide range of ab initio calculations give robust and consistent predictions for this ratio. To experimentally test the validity of these ab initio predictions, we performed a Coulomb excitation experiment to measure the B(E2; 3/2(-) -> 1/2(-)) transition strength in Be-7 for the first time. A B(E2; 3/2(-) -> 1/2(-)) value of 26(6)(stat)(3)(syst) e(2)fm(4) was deduced from the measured Coulomb excitation cross section. This result is used with the experimentally known Li-7 B(E2; 3/2(-) -> 1/2(-)) value to provide an experimental ratio to compare with the ab initio predictions. Our experimental value is consistent with the theoretical ratios within 1 sigma uncertainty, giving experimental support for the value of these ratios. Further work in both theory and experiment can give insight into the robustness of these ratios and their physical meaning.

机译：电磁观察能够深入了解核，包括核聚类的集体和紧急特征。这些可观察到还为AB Initio理论提供了强大的限制，但由于缺乏相关计算值的收敛性，例如E2过渡强度，因此理论和实验之间的这些可观察到的比较可能是困难的。通过比较镜像过渡的E2转变强度的比率，我们发现广泛的AB Initio计算对该比率提供了鲁棒和一致的预测。为了通过实验测试这些AB Initio预测的有效性，我们首次执行了对BE-7的B（E2; 3/2（ - ） - > 1/2（ - ））过渡强度进行测量。 AB（E2; 3/2（ - ） - > 1/2（ - ））值为26（6）（统计）（3）（SYT）E（2）FM（4）从测量的库仑激发交叉中推断出来部分。该结果与实验已知的Li-7b（E2; 3/2（ - ） - > 1/2（ - ））值一起使用，以提供与AB Initio预测的实验比率。我们的实验值与1 sigma不确定性的理论比率一致，对这些比例的价值进行了实验支持。理论和实验中的进一步工作可以深入了解这些比例的稳健性及其物理意义。

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《Physical review, C》 |2019年第6期|共9页
作者
Henderson S. L.; Ahn T.; Caprio M. A.; Fasano P. J.; Simon A.; Tan W.; OMalley P.; Allen J.; Bardayan D. W.; Blankstein D.; Frentz B.; Hall M. R.; Kolata J. J.; McCoy A. E.; Moylan S.; Reingold C. S.; Strauss S. Y.; Torres-Isea R. O.;
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Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Notre Dame Dept Phys 225 Nieuwland Sci Hall Notre Dame IN 46556 USA;

Univ Michigan Dept Phys Randall Lab 450 Church St Ann Arbor MI 48109 USA;

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中图分类原子核物理学、高能物理学;
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First measurement of the B(E2; 3/2(-) -> 1/2(-)) transition strength in Be-7: Testing ab initio predictions for A=7 nuclei

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