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The $\bar{\nu}_{e}-e^{-}$ elastic scattering cross-section was measured witha CsI(Tl) scintillating crystal array having a total mass of 187kg. Thedetector was exposed to an average reactor $\bar{\nu}_{e}$ flux of$\rm{6.4\times 10^{12} ~ cm^{-2}s^{-1}}$ at the Kuo-Sheng Nuclear PowerStation. The experimental design, conceptual merits, detector hardware, dataanalysis and background understanding of the experiment are presented. Using29882/7369 kg-days of Reactor ON/OFF data, the Standard Model(SM) electroweakinteraction was probed at the squared 4-momentum transfer range of $\rm{Q^2\sim 3 \times 10^{-6} ~ GeV^2}$. The ratio of experimental to SM cross-sectionsof $ \xi =[ 1.08 \pm 0.21(stat)\pm 0.16(sys)] $ was measured. Constraints onthe electroweak parameters $(g_V , g_A)$ were placed, corresponding to a weakmixing angle measurement of $ \s2tw = 0.251 \pm 0.031({\it stat}) \pm0.024({\it sys}) $. Destructive interference in the SM $\nuebar -$e process wasverified. Bounds on anomalous neutrino electromagnetic properties were placed:neutrino magnetic moment at $\mu_{\nuebar}< 2.2 \times 10^{-10} \mu_{\rm B}$and the neutrino charge radius at $-2.1 \times 10^{-32} ~{\rm cm^{2}} <\nuchrad < 3.3 \times 10^{-32} ~{\rm cm^{2}}$, both at 90% confidence level.

Measurement of Neutrino-Electron Scattering Cross-Section with a CsI(Tl) Scintillating Crystal Array at the Kuo-Sheng Nuclear Power Reactor