n uc l - th / 9 40 50 04 v 1 4 M ay 1 99 4 Escape and spreading properties of charge - exchange resonances in 208 Bi

ar X iv : n uc l - th / 9 90 50 49 v 1 2 1 M ay 1 99 9 η - and η ′ - meson production in the reaction pn → dM near threshold

ar X iv : n uc l - th / 9 80 50 53 v 1 2 9 M ay 1 99 8 g - factor of a tightly bound electron

We study the hyperfine splitting of an electron in hydrogen-like 209 Bi 82+. It is found that the hfs energy splitting can be explained well by considering the g-factor reduction due to the binding effect of a bound electron. We determine for the first time the experimental value of the magnetic moment of a tightly bound electron.

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 90 50 49 v 2 2 6 M ay 1 99 9 η - and η ′ - meson production in the reaction pn → dM near threshold

X iv : n uc l - th / 9 80 50 07 v 1 4 M ay 1 99 8 Neutrino capture by r - process waiting - point nuclei

We use the Quasiparticle Random Phase Approximation to include the effects of low-lying Gamow-Teller and first forbidden strength in neutrino capture by very neutron-rich nuclei with N = 50, 82, or 126. For electron neutrinos in what is currently considered the most likely r-process site the capture cross sections are two or more times previous estimates. We briefly discuss the reliability of o...