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 10A·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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Gaudefroy, L., Sorlin, O., Beaumel, D. et al. Study of the N = 28 shell closure in the Ar isotopic chain. Eur. Phys. J. A 27 (Suppl 1), 309–314 (2006). https://doi.org/10.1140/epja/i2006-08-047-0
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DOI: https://doi.org/10.1140/epja/i2006-08-047-0