Speaker
Description
The recent mass measurement of $^{70}$Kr using the $B\rho$-defined isochronous mass spectrometry yields a mass excess of $-41320(140)$ keV, indicating a 220-keV increase in binding energy compared to the AME2020 prediction. We utilize this experimental mass to probe its impact on the potential waiting point $^{68}$Se in $r$p-process and quantitatively constrain the $2p$-capture reaction flow that can bypass this waiting point. Our investigation shows that the more tightly bound nature of $^{70}$Kr enhances this $2p$-capture reaction flow up to a factor of four. This enhancement reduces the effective half-life of $^{68}$Se. A one-zone X-ray burst model calculations reveal that the higher flow of $^{70}$Kr has distinct effects on the tail structure of light curve and the final SnSbTe abundances in the ashes due to a stronger $r$p-process heating.
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