Q_β Measurement of the N=Z rp-Process Waiting-Point Nucleus ^68Se and its Astrophysical Implications

Precise mass measurements of nuclides along the N=Z line are important input parameters for rp-process calculations. Of particular interest is the mass of the ^68_34Se_34 rp-process waiting point nucleus. This mass was determined via the β-endpoint measurement of ^68Se. The ^68Se was produced via the ^12C(^58Ni,2n)^68Se reaction. In addition to the experiment a study of the influence of different masses on the rp-process has been performed. Both, the result and the astrophysical consequences will be presented.