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Neutrino-induced deuteron disintegration experiment

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arxiv hep-ex/9904001 v1 pith:UEJWVB27 submitted 1999-04-01 hep-ex

Neutrino-induced deuteron disintegration experiment

classification hep-ex
keywords valuebetacrosscm-sqconstantdeuterondisintegrationimproved
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Cross sections for the disintegration of the deuteron via neutral-current (NCD) and charged-current (CCD) interactions with reactor antineutrinos are measured to be 6.08 +/- 0.77 x 10^(-45) cm-sq and 9.83 +/- 2.04 x 10^(-45) cm-sq per neutrino, respectively, in excellent agreement with current calculations. Since the experimental NCD value depends upon the CCD value, if we use the theoretical value for the CCD reaction, we obtain the improved value of 5.98 +/- 0.54 x 10^(-45) for the NCD cross section. The neutral-current reaction allows a unique measurement of the isovector-axial vector coupling constant in the hadronic weak interaction (beta). In the standard model, this constant is predicted to be exactly 1, independent of the Weinberg angle. We measure a value of beta^2 = 1.01 +/- 0.16. Using the above improved value for the NCD cross section, beta^2 becomes 0.99 +/- 0.10.

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