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${}^{+}$~$\to$~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.

5 pages, 5 figures

References in corpus (10)

• New physics searches in nuclear and neutron $\beta$ decay
• Scalar interaction limits from the beta-neutrino correlation of trapped radioactive atoms
• Positron-neutrino correlation in the 0^+ \to 0^+ decay of ^{32}Ar
• High precision analytical description of the allowed $\beta$ spectrum shape
• Measurement of the Beta-Neutrino Correlation of Sodium-21 using Shakeoff Electrons
• Kinematic sensitivity to the Fierz term of $\beta$-decay differential spectra
• Performance of Geant4 in simulating semiconductor particle detector response in the energy range below 1 MeV
• Detailed beta-decay study of 33Ar
• Positron-neutrino correlations in 32Ar and 33Ar Decays: Probes of Scalar weak currents and nuclear isospin mixing
• A new scheme to measure the electron-neutrino correlation - the case of ${}^6$He

Cited by in corpus (6)

• Electroweak nuclear radii constrain the isospin breaking correction to $V_{ud}$
• $\mathcal{F}t$ values of the mirror $\beta$ transitions and the weak magnetism induced current in allowed nuclear $\beta$ decay
• Opportunities and open questions in modern $\beta$ decay
• First Penning trap mass measurement of ${}^{36}$Ca
• Detailed study of the decay of 32Ar
• Isospin Mixing and the Cubic Isobaric Multiplet Mass Equation in the Lowest T = 2, A = 32 Quintet