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

0524525 - ÚJF 2021 RIV US eng J - Článek v odborném periodiku
Araujo-Escalona, V. - Atanasov, D. - Flechard, X. - Alfaurt, P. - Ascher, P. - Blank, B. - Daudin, L. - Gerbaux, M. - Giovinazzo, J. - Grévy, S. - Kurtukian-Nieto, T. - Lienard, E. - Quemener, G. - Severijns, N. - Vanlangendonck, S. - Versteegen, M. - Zákoucký, Dalibor
Simultaneous measurements of the beta-neutrino angular correlation in Ar-32 pure Fermi and pure Gamow-Teller transitions using beta-proton coincidences.
Physical Review C. Roč. 101, č. 5 (2020), č. článku 055501. ISSN 2469-9985. E-ISSN 2469-9993
Grant CEP: GA MŠMT(CZ) LTT17018; GA MŠMT(CZ) LM2018104
Institucionální podpora: RVO:61389005
Klíčová slova: neutrino * ISOLDE-CERN
Obor OECD: Nuclear physics
Impakt faktor: 3.296, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.1103/PhysRevC.101.055501

We report first measurements of the beta-neutrino angular correlation based on the kinetic-energy shift of protons emitted in parallel or antiparallel directions with respect to the positron in the beta decay of Ar-32. This proof of principle experiment performed at ISOLDE-CERN provided simultaneous measurements for both a superallowed 0(+) -> 0(+ )transition and a Gamow-Teller transition followed by proton emission. The results, respectively (a) over tilde (beta nu) = 1.007(32)(stat) (25)(syst) and (a) over tilde (beta nu) = -0.222(86)(stat) (16)(syst), are found in agreement with the standard model. The 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 exotic weak interactions.
Trvalý link: http://hdl.handle.net/11104/0308874