Abstract
High-spin states of 38Ar have been studied with the 35Cl(α, pγ) 38Ar reaction at E α = 18 MeV and with the 24Mg( 16O, 2pγ) 38Ar reaction at E( 16 O) = 38 and 45 MeV . The 38Ar level scheme is obtained with the former reaction from a proton-γ coincidence measurement. Gamma-gamma coincidence, γ-ray angular distribution and linear polarization experiments have been performed with a Ge(Li)-Na(Tl) Compton suppression spectrometer and a three-crystal Ge(Li) Compton polarimeter. Unambiguous spin-parity assignments of J π = 7 −, 7 +, 8 +, 7 −, 9 − and 11 − to the 38Ar levels at E x = 7.51, 8.08, 8.57, 8.97, 10.17 and 11.61 MeV, respectively, are obtained. The 8.57 MeV, 8 + level has a mean life below 0.8 ps. Excitation energies, branching ratios, multipole mixing ratios and transition strengths are reported. The experimental results are compared with shell-model calculations.
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