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dc.contributor.authorDunlop, R.
dc.contributor.authorBall, G.C.
dc.contributor.authorLeslie, J.R.
dc.contributor.authorSvensson, C.E.
dc.contributor.authorTowner, I.S.
dc.contributor.authorAndreoiu, C.
dc.contributor.authorChagnon-Lessard, S.
dc.contributor.authorChester, A.
dc.contributor.authorCross, D.S.
dc.contributor.authorFinlay, P.
dc.contributor.authorGarnsworthy, A.B.
dc.contributor.authorGarrett, P.E.
dc.contributor.authorGlister, J.
dc.contributor.authorHackman, G.
dc.contributor.authorHadinia, B.
dc.contributor.authorLeach, K. G.
dc.contributor.authorRand, E.T.
dc.contributor.authorStarosta, K.
dc.contributor.authorTardiff, E.R.
dc.contributor.authorTriambak, S.
dc.contributor.authorWilliams, S. J.
dc.contributor.authorWong, J.
dc.contributor.authorYates, S.W.
dc.contributor.authorZganjar, E.F.
dc.identifier.citationDunlop, R. et al. (2013). High-precision branching-ratio measurement for the superallowed ?+ emitter 74Rb. Physical Review C, 88(4): 1-27en_US
dc.description.abstractA high-precision branching-ratio measurement for the superallowed β + decay of 74Rb was performed at the TRIUMF Isotope Separator and Accelerator (ISAC) radioactive ion-beam facility. The scintillating electronpositron tagging array (SCEPTAR), composed of 10 thin plastic scintillators, was used to detect the emitted β particles; the 8π spectrometer, an array of 20 Compton-suppressed HPGe detectors, was used for detecting γ rays that were emitted following Gamow-Teller and nonanalog Fermi β + decays of 74Rb; and the Pentagonal Array of Conversion Electron Spectrometers (PACES), an array of 5 Si(Li) detectors, was employed for measuring β-delayed conversion electrons. Twenty-three excited states were identified in 74Kr following 8.241(4) × 108 detected 74Rb β decays. A total of 58 γ -ray and electron transitions were placed in the decay scheme, allowing the superallowed branching ratio to be determined as B0 = 99.545(31)%. Combined with previous half-life and Q-value measurements, the superallowed branching ratio measured in this work leads to a superallowed f t value of 3082.8(65) s. Comparisons between this superallowed f t value and the world-average-corrected Ft value, as well as the nonanalog Fermi branching ratios determined in this work, provide guidance for theoretical models of the isospin-symmetry-breaking corrections in this mass region.en_US
dc.publisherAmerican Physical Society
dc.subjectPhysical scienceen_US
dc.subjectBranching-ratio measurementen_US
dc.subjectTRIUMF Isotope Separator and Accelerator (ISAC)en_US
dc.subjectScintillating electronpositron tagging array (SCEPTAR)en_US
dc.titleHigh-Precision Branching Ratio Measurement for the Superallowed + Emitter 74Rben_US

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