DEPARTMENT OF NUCLEAR PHYSICS - NUCLEAR ENGINEERING - MEDICAL PHYSICS

Investigation of the ground-state spin inversion in the neutron-rich $47,49\mathrm{Cl}$ isotopes

B. D. Linh, N.T.T.Phuc et al.

Phys. Rev. C 104, 044331

Abstract:

A first $\gamma$-ray study of $47,49\mathrm{Cl}$ spectroscopy was performed at the Radioactive Isotope Beam Factory with $50\mathrm{Ar}$ projectiles at 217 MeV/nucleon, impinging on the liquid hydrogen target of the MINOS device. Prompt deexcitation $\gamma$ rays were measured with the NaI(Tl) array DALI2${}^{}$. Through the one-proton knockout reaction $50\mathrm{Ar}(p,2p)$, a spin assignment could be determined for the low-lying states of $49\mathrm{Cl}$ from the momentum distribution obtained with the SAMURAI spectrometer. A spin-parity $J^{\pi }=3/2^{+}$ is deduced for the ground state of $49\mathrm{Cl}$, similar to the recently studied $N=32$ isotope $51K$. The evolution of the energy difference $E(1/{21}_{}^{+})-E(3/{21}_{}^{+})$ is compared to state-of-the-art theoretical predictions.

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