Microscopic theories of neutrino-^{12}C reactions

Abstract

In view of the recent experiments on neutrino oscillations performed by the LSND and KARMEN collaborations as well as of future experiments, we present new theoretical results of the flux averaged ${}^{12}C({\nu }_e,e^{-}{)}^{12}N$ and ${}^{12}C({\nu }_{\mu },{\mu }^{-}{)}^{12}N$ cross sections. The approaches used are charge-exchange RPA, charge-exchange RPA among quasi-particles (QRPA) and the Shell Model. With a large-scale shell model calculation the exclusive cross sections are in nice agreement with the experimental values for both reactions. The inclusive cross section for ${\nu }_{\mu }$ coming from the decay-in-flight of ${\pi }^{+}$ is $15.2\times 10^{-40}c{m}^2$ to be compared to the experimental value of $12.4\pm 0.3\pm 1.8\times 10^{-40}c{m}^2$, while the one due to ${\nu }_e$ coming from the decay-at-rest of ${\mu }^{+}$ is $16.4\times 10^{-42}c{m}^2$ which agrees within experimental error bars with the measured values. The shell model prediction for the decay-in-flight neutrino cross section is reduced compared to the RPA one. This is mainly due to the different kind of correlations taken into account in the calculation of the spin modes and partially due to the shell-model configuration basis which is not large enough, as we show using arguments based on sum-rules.

17 pages, latex, 5 figures

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