| Article | |
| Report number | arXiv:1906.05135 |
| Title | Simultaneous measurements of the $\beta$ -neutrino angular correlation in $^{32}$Ar pure Fermi and pure Gamow-Teller transitions using $\beta$ -proton coincidences |
| Author(s) | Araujo-Escalona, V. (Leuven U.) ; Atanasov, D. (Leuven U. ; CERN) ; Fléchard, X. (ENSICAEN) ; Alfaurt, P. (CENBG, Gradignan) ; Ascher, P. (CENBG, Gradignan) ; Blank, B. (CENBG, Gradignan) ; Daudin, L. (CENBG, Gradignan) ; Gerbaux, M. (CENBG, Gradignan) ; Giovinazzo, J. (CENBG, Gradignan) ; Grévy, S. (CENBG, Gradignan) ; Kurtukian-Nieto, T. (CENBG, Gradignan) ; Liénard, E. (ENSICAEN) ; Quéméner, G. (ENSICAEN) ; Severijns, N. (Leuven U.) ; Vanlangendonck, S. (Leuven U.) ; Versteegen, M. (CENBG, Gradignan) ; Zakoucky, D. (Rez, Nucl. Phys. Inst.) |
| Publication | 2020-05-14 |
| Imprint | 2019-06-12 |
| Number of pages | 7 |
| In: | Phys. Rev. C 101 (2020) 055501 |
| DOI | 10.1103/PhysRevC.101.055501 (publication) |
| Subject category | nucl-ex ; Nuclear Physics - Experiment |
| Accelerator/Facility, Experiment | CERN ISOLDE |
| Abstract | We report first time measurements of the beta-neutrino angular correlation based on the kinetic energy shift of protons emitted in parallel or anti-parallel directions with respect to the positron in the beta decay of $^{32}$Ar. This proof of principle experiment provided simultaneous measurements for the superallowed 0$^+$ $\rightarrow$ 0$^+$ transition followed by a 3356 keV proton emission and for a Gamow-Teller transition followed by a 2123 keV proton emission. The results, respectively ${\tilde a_{\beta\nu}}=1.01(3)_{(stat)}(2)_{(syst)}$ and ${\tilde a_{\beta\nu}}=-0.22(9)_{(stat)}(2)_{(syst)}$, are found in agreement with the Standard Model. A careful analysis of the data shows that future measurements can reach a precision level of 10$^{-3}$ for both pure Fermi and pure Gamow-Teller decay channels, providing new constraints on both scalar and tensor weak interactions. |
| Copyright/License | preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2020-2024 American Physical Society |
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