l - th / 9 71 00 54 v 1 2 3 O ct 1 99 7 The energy dependence of the in - medium ηN cross section

ar X iv : n uc l - th / 9 71 00 17 v 1 6 O ct 1 99 7 A new evaluation of the Baldin sum rule

The Baldin sum rule for the nucleon has been recalculated at the light of the most recent photoabsorption cross section measurements. The proton value (α + β) p = 13.69 ± 0.14 is smaller but consistent with the one usually quoted in literature. However, the value for the neutron (α + β) n = 14.40 ± 0.66 turns out to be three standard deviations away from the previously calculated one.

ar X iv : n uc l - th / 9 81 00 24 v 1 9 O ct 1 99 8 1 Uncertainties in the Solar Neutrino Flux

I discuss three issues relevant to solar neutrino flux measurements: cross section uncertainties in pp chain reactions, uncertainties in the GALLEX/SAGE response to 7 Be and 51 Cr neutrinos, and the implications of helioseismology for nonstandard suns with mixed cores. A few comments are also offered on νe ↔ ντ oscillations, cosmologically interesting neutrino masses, and recent proposals for s...

th / 9 71 00 42 v 1 1 8 O ct 1 99 7 Fusion cross sections for superheavy nuclei in the dinuclear system concept

Using the dinuclear system concept we present calculations of production cross sections for the heaviest nuclei. The obtained results are in a good agreement with the experimental data. The experimentally observed rapid fall-off of the cross sections of the cold fusion with increasing charge number Z of the compound nucleus is explained. Optimal experimental conditions for the synthesis of the ...

ar X iv : n uc l - th / 9 90 50 04 v 1 4 M ay 1 99 9 Q 2 - Dependence of the Drell - Hearn - Gerasimov integral

The energy and four-momentum (Q 2) dependence of the photo-absorption cross section on the proton is calculated for helicity-1 2 and-3 2 states. An effective Lagrangian model is used, formulated in terms of meson and baryon degrees of freedom, which obeys crossing symmetry, unitarity, Lorentz and gauge invariance. The difference in the cross sections for the two helicity states, the Drell-Hearn...

ar X iv : n uc l - th / 9 31 00 28 v 1 2 1 O ct 1 99 3 An antiproton - proton partial - wave analysis