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Simultaneous measurements of the $\beta$ -neutrino angular correlation in $^{32}$Ar pure Fermi and pure Gamow-Teller transitions using $\beta$ -proton coincidences

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.
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https://hal.archives-ouvertes.fr/hal-02159729
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Submitted on : Wednesday, October 6, 2021 - 10:04:26 AM
Last modification on : Saturday, November 26, 2022 - 7:06:49 AM
Long-term archiving on: : Friday, January 7, 2022 - 6:23:09 PM

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V. Araujo-Escalona, D. Atanasov, X. Fléchard, P. Alfaurt, P. Ascher, et al.. Simultaneous measurements of the $\beta$ -neutrino angular correlation in $^{32}$Ar pure Fermi and pure Gamow-Teller transitions using $\beta$ -proton coincidences. Phys.Rev.C, 2020, 101 (5), pp.055501. ⟨10.1103/PhysRevC.101.055501⟩. ⟨hal-02159729⟩

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