Isotopically resolved neutron total cross sections at intermediate energies

The neutron total cross sections ${\sigma }_{tot}$ of ${}^{16,18}$O, ${}^{58,64}$Ni, ${}^{103}$Rh, and ${}^{112,124}$Sn have been measured at the Los Alamos Neutron Science Center (LANSCE) from low to intermediate energies (3 $\leq E_{lab} \leq$450MeV)byleveragingwaveform-digitizertechnology\mathrm{.}The$\sigma_{tot}$ relative differences between isotopes are presented, revealing additional information about the isovector components needed for an accurate optical-model description away from stability. Digitizer-enabled ${\sigma }_{tot}$-measurement techniques are discussed and a series of uncertainty-quantified dispersive optical model (DOM) analyses using these new data is presented, validating the use of the DOM for modeling light systems (${}^{16,18}$O) and systems with open neutron shells (${}^{58,64}$Ni and ${}^{112,124}$Sn). The valence-nucleon spectroscopic factors extracted for each isotope reaffirm the usefulness of high-energy proton reaction cross sections for characterizing depletion from the mean-field expectation.