  Weak interaction rates are studied in neutron deficient Kr and Sr
waiting-point isotopes in ranges of densities and temperatures relevant for the
rp-process. The nuclear structure is described within a microscopic model
(deformed QRPA) that reproduces not only the half-lives but also the
Gamow-Teller strength distributions recently measured. The various
sensitivities of the decay rates to both density and temperature are discussed.
Continuum electron capture is shown to contribute significantly to the weak
rates at rp-process conditions.
