New operation mode, "separated flow mode", has been developed for in-flight proton decay experiments with the SHARAQ spectrometer. In the separated flow mode, the protons and the heavy-ion products are separated and measured in coincidence at two different focal planes of SHARAQ. The ion-optical properties of the new mode were studied by using a proton beam at $246~{ \rm MeV}$, and the momentum vector was properly reconstructed from the parameters measured in the focal plane of SHARAQ. In the experiment with the $({ }^{ 16}{ \rm O},{ }^{ 16}{ \rm F})$ reaction at a beam energy of $247~{ \rm MeV/u}$, the outgoing ${ }^{ 15}{ \rm O}+p$ produced by the decay of ${ }^{ 16}{ \rm F}$ were measured in coincidence with SHARAQ. High energy resolutions of $100~{ \rm keV}$ (FWHM) and $\sim 2~{ \rm MeV}$ were achieved for the relative energy of $535~{ \rm keV}$, and the ${ }^{ 16}{ \rm F}$ energy of $3940~{ \rm MeV}$, respectively.
Categories: physics.ins-det nucl-ex