Simultaneous measurements of the β -neutrino angular correlation in Ar32 pure Fermi and pure Gamow-Teller transitions using β -proton coincidences
| Autor: | V. Araujo-Escalona, D. Zákoucký, E. Liénard, P. Ascher, P. Alfaurt, Nathal Severijns, Xavier Flechard, J. Giovinazzo, T. Kurtukian-Nieto, M. Gerbaux, G. Quéméner, M. Versteegen, Dinko Atanasov, S. Grévy, L. Daudin, B. Blank, S. Vanlangendonck |
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| Rok vydání: | 2020 |
| Předmět: |
Semileptonic decay
Physics Proton 010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena Weak interaction Kinetic energy 01 natural sciences 7. Clean energy Beta decay Standard Model 0103 physical sciences High Energy Physics::Experiment Atomic physics Neutrino Proton emission Nuclear Experiment 010306 general physics |
| Zdroj: | Physical Review C. 101 |
| ISSN: | 2469-9993 2469-9985 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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