SAXENA, M.; ONG, W. -J; MEISEL, Z.; HOFF, D.E.M.; SMIRNOVA, N.; BENDER, P.C.; BURCHER, S.P.; CARPENTER, M.P.; CARROLL, J.J.; CHESTER, A.; CHIARA, C.J.; CONAWAY, R.; COPP, P.A.; CRIDER, B.P.; DERKIN, J.; ESTRADE, A.; HAMAD, G.; HARKE, J.T.; JAIN, R.; JAYATISSA, H.; LIDDICK, S.N.; LONGFELLOW, B.; MOGANNAM, M.; MONTES, F.; NEPAL, N.; OGUNBEKU, T.H.; RICHARD, A.L.; SCHATZ, H.; SOLTESZ, D.; SUBEDI, S.K.; SULTANA, I.; TAMASHIRO, A.S.; TRIPATHI, V.; XIAOG, Y.; ZINK, R.

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We measured the $^{57}$Zn $\beta$-delayed proton ($\beta$p) and $\gamma$ emission at the National Superconducting Cyclotron Laboratory. We find a $^{57}$Zn half-life of 43.6 $\pm$ 0.2 ms, $\beta$p branching ratio of (84.7 $\pm$ 1.4)%, and identify four transitions corresponding to the exotic $\beta$-$\gamma$-$p$ decay mode, the second such identification in the $f p$-shell. The $p/\gamma$ ratio was used to correct for isospin mixing while determining the $^{57}$Zn mass via the isobaric multiplet mass equation. Previously, it was uncertain as to whether the rp-process flow could bypass the textbook waiting point $^{56}$Ni for astrophysical conditions relevant to Type-I X-ray bursts. Our results definitively establish the existence of the $^{56}$Ni bypass, with 14-17% of the $rp$-process flow taking this route.< Réduire

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$^{57}$Zn $\beta$-delayed proton emission establishes the $^{56}$Ni $rp$-process waiting point bypass

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