Discovery of $^{34g,m}$Cl($p,\gamma$)$^{35}$Ar resonances

Sulfur isotopic ratios have potential to aid in the classification of presolar grains. Limited knowledge of the $^{34g,m}$Cl($p,\gamma$)$^{35}$Ar reaction rates leads to uncertainties in the production of $^{34}$S in oxygen-neon classical nova models. To determine these reaction rates, we have indirectly measured $^{34g,m}$Cl($p,\gamma$)$^{35}$Ar resonance energies up to 800 keV above the $^{35}$Ar proton threshold. $^{35}$Ar excited states were populated using the $^{36}$Ar($d,t$)$^{35}$Ar reaction and reaction products were momentum analyzed by a high resolution quadrupole-dipole-dipole-dipole (Q3D) magnetic spectrograph. Seventeen new $^{35}$Ar levels have been discovered and uncertainties on previously known levels have been substantially reduced. Experimental level densities were then compared to those calculated using the WBMB Hamiltonian within the $sd-pf$ model space, indicating that most of the expected resonances have been observed.