Abstract
The structure of the neutron-rich nucleus 47Ar has been investigated through the d(46Ar,47Ar)p transfer reaction. The radioactive beam of 46Ar at 10 A · MeV was provided by the SPIRAL facility at GANIL. The protons corresponding to a neutron pick-up on bound or unbound states mechanism in 47Ar nuclei were detected at backward angles by the position-sensitive Si array-detector MUST. The transfer-like ejectiles were detected in the SPEG spectrometer. Level scheme, spin assignments and spectroscopic factors have been deduced for 47Ar and compared to shell model predictions. They suggest a slight erosion of the N=28 shell gap from the weakening of the spin-orbit interaction arising from the f and p orbitals. These spectroscopic information are subsequently used to infer (n, γ) reaction rates in the Ar isotopic chain to understand the origin of the 48Ca/46Ca abnormal isotopic ratio observed in certain inclusions of meteorites.
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