1985/06/01 by L. A. Ahrens, S. H. Aronson, P. L. Connolly +28 · 2 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies
paper · doi:10.1103/physrevd.31.2732
openalex publication_date 1985/06/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Measurements have been made of the reactions \ensuremathνen\ensuremath→e^\mathrm\ensuremath-p and \ensuremathν_\ensuremathμn\ensuremath→\ensuremathμ^\mathrm\ensuremath-p in a detector located an effective distance of 96 m from a neutrino source. These measurements yield directly the energy-dependent ratio of the neutrino fluxes [\ensuremathΦ(E(\ensuremathνe))/\ensuremathΦ(E(\ensuremathν_\ensuremathμ))\phantom\rule0ex0ex]obs incident on the detector. When combined with an estimate of the flux ratio emanating from the source [\ensuremathΦ(E(\ensuremathνe))/\ensuremathΦ(E(\ensuremathν_\ensuremathμ))\phantom\rule0ex0ex]calc, the measured ratio provides an upper limit on the strength of mixing between \ensuremathν_\ensuremathμ and \ensuremathνe. We obtain sin22\ensuremathα3.4\ifmmode×\else\texttimes\fi10^\mathrm\ensuremath-3 (90% C.L.) in the limit of large mass difference \ensuremathΔm2 (\ensuremath≡\ensuremath\Vertm12-m22\ensuremath\Vert) between neutrino mass eigenstates, m1 and m2; and an upper limit on the product \ensuremathΔm2 sin2\ensuremathα0.43 eV2 in the limit of small mass difference.