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

S. L. Henderson, T. Ahn, M. A. Caprio, P. J. Fasano, A. Simon, W. Tan, P. O'Malley, J. Allen, D. W. Bardayan, D. Blankstein, B. Frentz, M. R. Hall, J. J. Kolata, A. E. McCoy, S. Moylan, C. S. Reingold, S. Y. Strauss, R. O. Torres-Isea

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

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 Be7 for the first time. A B(E2;3/2-→1/2-) value of 26(6)stat(3)syste2fm4 was deduced from the measured Coulomb excitation cross section. This result is used with the experimentally known Li7B(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 1σ 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.

Original languageEnglish
Article number064320
JournalPhysical Review C
Volume99
Issue number6
DOIs
StatePublished - 18 Jun 2019
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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