2,292 research outputs found

    Neutrinos from CNO cycle at the present epoch of the solar neutrino research

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    The importance of the study of solar neutrinos generated in CNO cycle is discussed in view of the presently obtained data. The emphasis is given to the precise detemination of the flux of low energy pp-neutrinos as a main topic of future experimental program.Comment: 4 pages, 2 Figures, Contribution for Proceedings of the Erice School 2009 in "Progress in Particle and Nuclear Physics

    Comments on "Limits on possible new nucleon monopole-dipole interactions from the spin relaxation rate of polarized 3^3He gas"

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    In the article "Limits on possible new nucleon monopole-dipole interactions from the spin relaxation rate of polarized 3^3He gas", new limits on short-range, Axion-like interactions are presented. In this comment it is shown that the theoretical treatement of the data overestimates the sensitivity of the proposed method. We provide the corrected limits

    Frequency shifts and relaxation rates for spin 1/2 particles moving in electromagnetic fields

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    We discuss the behaviour of the Larmor frequency shift and the longitudinal relaxation rate due to non-uniform electromagnetic fields on an assembly of spin 1/2 particles, in adiabatic and nonadiabatic regimes. We also show some general relations between the various frequency shifts and between the frequency shifts and relaxation rates. The remarkable feature of all our results is that they were obtained without any specific assumptions on the explicit form of the correlation functions of the fields. Hence, we expect that our results are valid both for diffusive and ballistic regime of motion and arbitrary cell shapes and surface scattering. These results can then be applied to a wide variety of realistic systems
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