Spectroscopy of ${}^{54}$Ti and the systematic behavior of low energy octupole states in Ca and Ti isotopes

Abstract

Excited states of the $N=32$ nucleus ${}^{54}$Ti have been studied, via both inverse-kinematics proton scattering and one-neutron knockout from ${}^{55}$Ti by a liquid hydrogen target, using the GRETINA $\gamma$-ray tracking array. Inelastic proton-scattering cross sections and deformation lengths have been determined. A low-lying octupole state has been tentatively identified in ${}^{54}$Ti for the first time. A comparison of $(p,p^{\prime })$ results on low-energy octupole states in the neutron-rich Ca and Ti isotopes with the results of Random Phase Approximation calculations demonstrates that the observed systematic behavior of these states is unexpected.

arXiv comment7 pages, 8 figures

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Cited by in corpus (1)

• $\mathbf{N}=32$ shell closure below calcium: Low-lying structure of ${}^{50}$Ar