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Background: The thermonuclear $^{34g,m}$Cl($p,\gamma$)$^{35}$Ar reactionrates are unknown due to a lack of experimental nuclear physics data.Uncertainties in these rates translate to uncertainties in $^{34}$S productionin models of classical novae on oxygen-neon white dwarfs. $^{34}$S abundanceshave the potential to aid in the classification of presolar grains.  Purpose: Determine resonance energies for the$^{34g,m}$Cl($p,\gamma$)$^{35}$Ar reactions within the region of astrophyicalinterest for classical novae to a precision of a few keV as an essential firststep toward constraining their thermonuclear reaction rates.  Method: $^{35}$Ar excited states were populated by the$^{36}$Ar($d,t$)$^{35}$Ar reaction at $E$(d)=22~MeV and reaction products weremomentum analyzed by a high resolution quadrupole-dipole-dipole-dipole (Q3D)magnetic spectrograph.  Results: Seventeen new $^{35}$Ar levels have been detected at a statisticallysignificant level in the region $E_x\approx$~5.9-6.7~MeV ($E_r$ \textless~800~keV) and their excitation energies have been determined to typicaluncertainties of 3~keV. The uncertainties for five previously known levels havealso been reduced substantially. The measured level density was compared tothose calculated using the WBMB Hamiltonian within the $sd-pf$ model space.  Conclusions: Most of the resonances in the region of astrophyical interesthave likely been discovered and their energies have been determined, but theresonance strengths are still unknown, and experimentally constraining the$^{34g,m}$Cl($p,\gamma$)$^{35}$Ar reaction rates will require furtherexperiments.

Discovery of $^{34g,m}$Cl$(p,\gamma)^{35}$Ar resonances activated at classical nova temperatures