High-precision Half-life And Branching Ratio Measurements For Superallowed $\beta^+$ Emitters At TRIUMF-ISAC

Autor: Steffen Ketelhut, J. R. Leslie, C. E. Svensson, A. Diaz Varela, P. Voss, B. Blank, A. Valencik, P. C. Bender, A. J. Radich, J. P. Thomas, Joochun Park, J. Giovinazzo, Aaron Chester, S. Triambak, J. Wong, I. S. Towner, G. C. Ball, Corina Andreoiu, D. W. Miller, C. Unsworth, A. B. Garnsworthy, R. Dunlop, K. Starosta, D. S. Jamieson, B. Jigmeddorj, J. Grinyer, H. Bidaman, W. J. Mills, Mustafa Rajabali, E. R. Tardiff, E. F. Zganjar, G. Hackman, A. T. Laffoley, A. D. MacLean, P. Finlay, M. Moukaddam, E. T. Rand, D. S. Cross, S. Chagnon-Lessard, R. A. E. Austin, Z. M. Wang, S. W. Yates, G. F. Grinyer, J. Glister, K. G. Leach, J. Turko, D. Kisliuk, G. Deng, V. Bildstein, S. J. Williams, H. Bouzomita, Baharak Hadinia, Michelle Dunlop, P. E. Garrett, T. Ballast
Přispěvatelé: Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Zdroj: PoS
26th International Nuclear Physics Conference
26th International Nuclear Physics Conference, Sep 2016, Adelaide, Australia. pp.167, ⟨10.22323/1.281.0167⟩
DOI: 10.22323/1.281.0167⟩
Popis: High precision measurements of the $ft$ values for superallowed Fermi $\beta$ transitions between $J^\pi~=~0^+$ isobaric analogue states allow for stringent tests of the electroweak interaction described by the Standard Model. These transitions provide an experimental probe of the Conserved-Vector-Current hypothesis, enable the most precise determination of the up-down ($V_{ud}$) element of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix, and allow one to set stringent limits on the existence of scalar currents in the weak interaction. An extensive program of superallowed branching-ratio and half-life measurements at TRIUMF's Isotope Separator and Accelerator (ISAC) facility has covered the full range of superallowed emitters, from the lightest case, $^{10}$C, to the heaviest case for which precision data are currently available, $^{74}$Rb. These experiments have been performed using a 4$\pi$ continuous-flow gas proportional $\beta$ counter, the 8$\pi$ $\gamma$-ray spectrometer, and, most recently, the new high-efficiency GRIFFIN $\gamma$-ray spectrometer. In this paper, recent highlights from the superallowed Fermi $\beta$ decay program at TRIUMF will be summarized, including high-precision half-life measurements for all three of the lightest superallowed emitters, $^{10}$C, $^{14}$O, and $^{18}$Ne, with the greatest sensitivity to a potential weak scalar current contribution, as well as high-precision branching-ratio measurements for the heavy superallowed emitters $^{62}$Ga and $^{74}$Rb.
Databáze: OpenAIRE
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