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The very first in-ring reaction experiment at the HIRFL-CSR heavy-ion storagering, namely proton elastic scattering on stable $^{58}$Ni nuclei, ispresented. The circulating $^{58}$Ni$^{19+}$ ions with an energy of 95 MeV/uwere interacting repeatedly with an internal hydrogen gas target in the CSReexperimental ring. Low energy proton recoils from the elastic collisions weremeasured with an ultra-high vacuum compatible silicon-strip detector. Deduceddifferential cross sections were normalized by measuring K-shell X-rays from$^{58}$Ni$^{19+}$ projectiles due to the $^{58}$Ni$^{19+}$-H$_2$ ionizationcollisions. Compared to the experimental cross sections, a good agreement hasbeen achieved with the theoretical predictions in the measured region, whichwere obtained by using the global phenomenological optical model potentials.Our results enable new research opportunities for optical model potentialstudies on exotic nuclides by using the in-ring reaction setup at the HIRFL-CSRfacility.

Measurement of $^{58}$Ni($p$, $p$)$^{58}$Ni elastic scattering at low momentum transfer by using the HIRFL-CSR heavy-ion storage ring