Speaker
Description
Effective lifetime of a nuclide is the key parameter that can quantitatively estimate the degree of passing this nuclide in rp-process.
The mass of neutron-deficient isotope $^{70}$Kr, which has been directly measured by using $B\rho$-defined isochronous mass spectrometry, allows us to re-evaluate the effective stellar half-life of the potential waiting point $^{68}$Se in rp-process under typical type-I x-ray bursts conditions.
With the more accurate mass data of $^{70}$Kr, the effective stellar half-life of $^{68}$Se at both low (typically below 1.5-2 GK) and high (above 1.5-2 GK) temperatures are calculated.
The results show that $^{68}$Se would not be a strong waiting point since its effective lifetime shorter than typical burst time scale of 10-100 s at low temperature, while poses a considerable delay at high temperature where the photodisintegration of $^{70}$Kr can not be negligible in rp-process.
