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

Close

PrevNext

View figure in article

• Binding energy & masses
• Nuclear astrophysics
• Nuclear physics of explosive environments
• Nucleosynthesis in explosive environments
• 59 ≤ A ≤ 89