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Author (up) Fernandez Ruiz, D. et al; Nacher, E. doi  openurl
  Title First determination of the isospin mixing in the 8Be 2+doublet via 8B beta decay Type Journal Article
  Year 2026 Publication Physics Letters B Abbreviated Journal Phys. Lett. B  
  Volume 880 Issue Pages 140791 - 5pp  
  Keywords Beta decay study; Isospin structure; Beta strength; Beta-delayed-alpha emission; Fermi and Gamow Teller transitions  
  Abstract We report on the first experimental determination of the Fermi /3 strength in the /3-decay of 8B, enabled by significant improvements in production yields at ISOLDE/CERN. This allows the direct observation of isospin mixing in the 16.6 and 16.9 MeV 2+ doublet in 8Be. Specifically, the 16.9 MeV state is resolved in /3-decay for the first time with sufficient statistics to test a widely used two-level model. With the high statistics we could perform two independent analyses: one based on the observed /3-strength distribution within the R-matrix framework, and a second based on the extracted /3-recoil broadening. The latter makes it possible to extract the Fermi and Gamow-Teller strengths up to the electron-capture region. The obtained strengths are fully consistent with the two-state isospin mixing model.  
  Address [Ruiz, D. Fernandez; Borge, M. J. G.; Nacher, E.; Tengblad, O.; Vinals, S.; Briz, J. A.; Marroquin, I.; Ovejas, J. D.; Perea, A.] CSIC, Inst Estruct Mat, Serrano 113 Bis, Madrid 28006, Spain, Email: mj.borge@csic.es  
  Corporate Author Thesis  
  Publisher Elsevier Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0370-2693 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:001837417200001 Approved no  
  Is ISI yes International Collaboration yes  
  Call Number IFIC @ pastor @ Serial 7358  
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