ARAUJO-ESCALONA, V.; ATANASOV, D.; FLÉCHARD, X.; ALFAURT, P.; ASCHER, P.; BLANK, B.; DAUDIN, L.; GERBAUX, M.; GIOVINAZZO, J.; GRÉVY, S.; KURTUKIAN-NIETO, T.; LIÉNARD, E.; QUÉMÉNER, G.; SEVERIJNS, N.; VANLANGENDONCK, S.; VERSTEEGEN, M.; ZAKOUCKY, D.

doi:10.1103/PhysRevC.101.055501

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ARAUJO-ESCALONA, V.

ATANASOV, D.

FLÉCHARD, X.
École Nationale Supérieure d'Ingénieurs de Caen [ENSICAEN]

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Article de revue

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Phys.Rev.C. 2020, vol. 101, n° 5, p. 055501

Resumen en inglés

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.< Leer menos

Palabras clave en inglés

Electroweak Interaction

Symmetries

energy: kinetic

p: energy

Gamow-Teller transition

angular correlation

semileptonic decay

weak interaction

semiconductor detector

argon

experimental results

DOI

http://dx.doi.org/10.1103/PhysRevC.101.055501

Proyecto ANR

Etudes de l'interaction faible avec la décroissance de 32Ar - ANR-18-CE31-0004

Orígen

Importado de Hal

Centros de investigación

Centre d'Études Nucléaires de Bordeaux Gradignan (CENBG)