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arXiv · 2512.14145

Impact of experimental mass of $^{70}$Kr on the $^{68}$Se waiting-point in $rp$-process

Min Zhang·Yudong Luo·Akira Dohi·Xing Xu·Xinliang Yan·Toshitaka Kajino·Yuhu Zhang·Meng Wang
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Abstract

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 -- the last piece of information needed -- to model the potential waiting point $^{68}$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 $^{70}$Kr enhances this 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 $rp$-process heating.

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Min Zhang, Yudong Luo, Akira Dohi, Xing Xu, Xinliang Yan, Toshitaka Kajino, Yuhu Zhang, Meng Wang. 2025-12-16. Impact of experimental mass of $^{70}$Kr on the $^{68}$Se waiting-point in $rp$-process. https://arxiv.org/abs/2512.14145

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