2 research outputs found

    Charged-current neutrino-208Pb reactions

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    We present theoretical results on the non flux-averaged 208Pb(νe,e−)208Bi^{208}Pb(\nu_{e},e^-)^{208}Bi and 208Pb(νμ,μ−)208Bi^{208}Pb(\nu_{\mu},\mu^-)^{208}Bi reaction cross sections, obtained within the charge-exchange Random-Phase-Approximation. A detailed knowledge of these cross sections is important in different contexts. In particular, it is necessary to assess the possibility of using lead as a detector in future experiments on supernova neutrinos, such as OMNIS and LAND, and eventually detect neutrino oscillation signals by exploiting the spectroscopic properties of 208Bi^{208}Bi. We discuss the present status on the theoretical predictions of the reaction cross sections.Comment: 5 pages, latex, 3 figures. added discussion on present status, Submitted to Phys.Rev.

    Microscopic theories of neutrino-^{12}C reactions

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    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 12C(νe,e−)12N^{12}C(\nu_e,e^-)^{12}N and 12C(νμ,μ−)12N^{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 νμ\nu_{\mu} coming from the decay-in-flight of π+\pi^+ is 15.2×10−40cm215.2 \times 10^{-40} cm^2 to be compared to the experimental value of 12.4±0.3±1.8×10−40cm212.4 \pm 0.3 \pm 1.8 \times 10^{-40} cm^2, while the one due to νe\nu_{e} coming from the decay-at-rest of μ+\mu^+ is 16.4×10−42cm216.4 \times 10^{-42} cm^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.Comment: 17 pages, latex, 5 figure
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