Studies ofAr41from theAr40(d, pγ)Ar41Reaction

Abstract

Particle-gamma coincidence measurements on the ${\mathrm{Ar}}^{40}(d, p\ensuremath{\gamma}){\mathrm{Ar}}^{41}$ reaction have been used to determine branching ratios for the gamma deexcitation of several ${\mathrm{Ar}}^{41}$ states of excitation energy less than 3.5 MeV. Gas targets of 99.6% ${\mathrm{Ar}}^{40}$ and a deuteron bombarding energy of 3.5 MeV were used for these measurements. Proton-gamma angular correlations were also studied at ${E}_{D}=3.2$ MeV, utilizing a collinear geometry with protons detected in an annular counter placed at 180\ifmmode^\circ\else\textdegree\fi{} and gamma rays detected at several angles between 0\ifmmode^\circ\else\textdegree\fi{} and 90\ifmmode^\circ\else\textdegree\fi{} relative to the beam direction. These data eliminate possible spin assignments of \textonehalf{} for the levels at 0.517 and 1.354 MeV and when combined with previous work lead to a ${J}^{\ensuremath{\pi}}={\frac{3}{2}}^{\ensuremath{-}}$ assignment for both of these states.