Speaker
Description
Nucleosynthesis in Type I X-ray bursts (XRB) proceeds eventually through the rp-process near the proton drip-line. Several N=Z nuclei act as waiting points in the reaction network chain. Astrophysical calculations of XRB light curves depend upon the theoretical modelling of the beta decays of interest, with 68Ge being a key nucleus in this context. Several such theoretical calculations have shown that, in these high-density and high-temperature scenarios, continuum electron capture and decay rates from excited states play an important role, in particular for nuclear species at and around the waiting-point nuclei.
In this talk I will report on the status of the analysis of experiment IS570, aimed at the study of the beta decay of the waiting point nucleus $^{64}$Ge and its N=Z+2 second-neighbour $^{66}$Ge, with the main goal of determining the B(GT) distribution for these decays with the Total Absorption gamma-ray Spectrometer Lucrecia at ISOLDE. More in detail, in this talk the status on the analysis for the isotope $^{64}$Ge and $^{64}$Ga will be presented, particularly the procedure to clean the main decay spectrum of the pile up, background and daughter contribution. The procedure to calculate the response function of Lucrecia to the decay of $^{64}$Ga, as well as preliminary results for this decay will be shown.
